Contents
1.1 Purpose of the Report
1.2 Structure of the Report
2.1 Background
2.2 General Site Description
2.3 Major Activities Undertaken
2.4 Project Organisation and
Management Structure
2.5 Status of Environmental
Approval Documents
3
Environmental Monitoring and Audit Requirements
3.1 Environmental Monitoring
3.1.1 Air
Quality
3.1.2 Odour
3.2
Site Audit
3.2.1 Water
Quality
3.2.2 Landscape
and Visual
4.1 Air Quality
4.1.1 Operation
Phase Monitoring
4.2 Odour
4.2.1 Operation
Phase Monitoring
4.3 Water Quality
4.3.1 Operation
Phase Monitoring
4.4 Waste Management
4.4.1 Operation
Phase Monitoring
5.1 Environmental Site Audit
5.1.1 Operation
Phase
5.2
Landscape
and Visual Audit
6 Environmental
Non-conformance
6.1 Summary of Environmental
Non-Compliance
6.2 Summary of Environmental
Complaint
6.3 Summary of Environmental
Summon and Successful Prosecution
7.1 Key Issues for the Coming
Reporting Period
LIST OF TABLES
Table 2.1 Summary of
Activities Undertaken in the Reporting Period
Table 2.2 Summary of Environmental Licensing,
Notification and Permit Status
Table 3.1 Sampling and
Laboratory Analysis Methodology
Table 3.2 Emission Limit for
CAPCS Stack
Table 3.3 Emission Limit for
CHP Stack
Table 3.4 Emission Limit for
ASP Stack
Table 3.5 Emission Limit
for Standby Flaring Gas Unit ()
Table 3.6 Odour Intensity
Level
Table 3.7 Action and
Limit Levels for Odour Nuisance
Table 3.8 Event and
Action Plan for Odour Monitoring
Table 4.1 Hourly Average
of Parameters Recorded for CAPCS
Table 4.2 Hourly Average
of Parameters Recorded for CHP 1
Table 4.3 Hourly Average
of Parameters Recorded for CHP 2
Table 4.4 Hourly Average
of Parameters Recorded for CHP 3
Table 4.5 Parameters
Recorded for ASP
Table 4.6 Hourly Average of Parameters
Recorded for the Standby Flaring Gas Unit
Table 4.10 Results of the Discharge Sample from
the Petrol Interceptor 1 on 20 April 2023
Table 4.11 Results of the Discharge Sample from
the Petrol Interceptor 2 on 20 April 2023
Table 4.12 Quantities of Waste
Generated from the Operation of the Project
Table 8.1 Exceedances for
Stack Emissions
Table 8.2 Exceedances for
Petrol Interceptor 1 and 2
LIST OF ANNEXES
Annex E Environmental complaint, Environmental
Summons and Prosecution Log |
The construction works of No.
EP/SP/61/10 Organic Resources Recovery Centre Phase 1 (the
Project) commenced on 21 May 2015. This is the 32nd quarterly
Environmental Monitoring and Audit (EM&A) report presenting the EM&A works
carried out during the period from 1 March 2023 to 31 May 2023 in accordance
with the EM&A Manual. Substantial completion of the construction works was
confirmed on 3 December 2018. In the meantime, the operation phase EM&A
programme had commenced in March 2019. Substantial Completion in respect of
substantial part of the Works was confirmed on 24 February 2020. The
construction phase EM&A programme was completed in the end of February
2020.
Summary of Works
undertaken during the Reporting Period
Works undertaken in the reporting
period included:
·
Operation of the Project, including organic waste
reception, and operation of the pre-treatment facilities, anaerobic digesters,
composting facilities, air pollution control systems, on-line emission monitoring
system for the Centralised Air Pollution Control Unit (CAPCS), Co-generation
Units (CHP)s and Ammonia Stripping Plant (ASP), and the wastewater treatment plant;
·
Adjustment of temperature curves on the CHP3;
·
CHP2 was returned in operation instead of CHP3, by
moving the throttle valve from CHP3 to CHP2;
·
Back purging testing for CEMS;
·
VOC calibration for CAPCS stack;
·
Emergency repair of chemical scrubber fan;
·
Preparation for QAL 2 on the CEMS system;
·
SBR 3 and ASP plate heat exchanger cleaning (April
2023 – May 2023);
·
Fire Services System annual inspection;
·
CEMS maintenance;
·
QAL 2 testing with 3rd Party Lab was conducted for MCS
1 and MCS 2; and
·
Replacement of membrane diffusers for all of the SBR Tanks of the Wastewater Treatment Plant was
completed.
Environmental
Monitoring and Audit Progress
Air Quality
Monitoring
Non-compliance of emission
limits of VOCs (including methane) from CAPCS, NOx and SO2
from the CHPs, NOx, SO2, NH3 and HCl from ASP,
HF from the Standby Flaring Gas Unit were recorded in March 2023. The
cause of the exceedances of VOCs (including methane) is due to faulty sensor.
The exceedances of SO2 from the
CHPs and ASP occurred due to tripping of the de-sulphurisation system resulted
from the residue of sulphur accumulated at the exhaust heat exchangers. The
exceedances of NOx from CHPs, NOx,
NH3 and HCl from ASP and HF from Standby Flaring Gas Unit occurred
due to system instability caused by prolonged usage of the CHPs, ASP and Standby Flaring Gas Unit.
Non-compliance of emission limits
of VOCs (including methane) from CAPCS, NOx and SO2 from
CHP 1, Dust, NOx, SO2, HCl and HF from CHP 2; NOx,
SO2 and NH3 from ASP recorded
in April 2023. The cause of the exceedances of VOCs (including methane)
is due to faulty sensor. The exceedances of SO2
from the CHPs occurred due to tripping of the
de-sulphurisation system resulted from the residue of sulphur accumulated at
the exhaust heat exchangers. The exceedances of dust, NOx, HCl and HF from CHPs occurred due to system instability
caused by prolonged usage of the CHPs. The exceedances of NOx, SO2 and NH3
from ASP occurred due to ASP pump failure which
caused equipment trip.
Non-compliance of emission limits
of Dust, VOCs, NOx and SO2 from CHP 1; Dust, NOx
and SO2 from CHP 2; NOx and SO2 from CHP 3;
CO, NOx, SO2, NH3 and HF from ASP were
recorded in May 2023. The exceedances of SO2 from the CHPs and ASP occurred due
to tripping of the de-sulphurisation system. The potential cause of exceedances
of Dust, VOCs and NOx from CHPs, as well as the
exceedances of CO, NOx, NH3 and HF from ASP was system
instability.
As similar issues have re-occurred
in multiple reporting periods, the Contractor is advised to undertake a
comprehensive review of the operation of the concerned systems and the
effectiveness of the existing mitigation measures and proposed further measures
to avoid the exceedance.
No odour patrols were required to
be conducted during the reporting period.
Non-compliance of discharge limits
of Total Nitrogen from the outlet chamber of the effluent storage tank from
March to May 2023; and Non-compliance of discharge limits of Suspended Solids
from Petrol Interceptor 1 were recorded on 20 April 2023.
The exceedances of Total Nitrogen
from the effluent discharge from the outlet chamber of Effluent Storage Tank
occurred due to an unexpected surge of Kjeldahl Nitrogen in Treated Effluent
and leading to high Total Nitrogen in Treated Effluent sampled on 9 March 2023
and 13 April 2023. The exceedance of Total Nitrogen was potentially caused
potentially caused by the poor performance of the Sequential Batch Reactor
(SBR), leading to an increased level of Nitrogen in the Treated Effluent
sampled on 5 May 2023.
Waste generated from the operation
of the Project includes chemical waste, waste generated from pre-treatment
process and general refuse.
No Chemical waste were collected during the reporting period by licenced waste
collector from the operation of the Project.
1,922.78 tonnes of waste generated
from pre-treatment process from the operation of the Project was disposed of at
landfill. Among the recyclable waste generated from pre-treatment process from
the operation of the Project, 0 tonnes of metals, 0.26 tonnes of
papers/cardboard packing, and 0 tonnes of plastics were sent to recyclers for
recycling during the reporting period.
Around 8.41 tonnes of general
refuse from the operation of the Project were disposed of at landfill. Among
the recycled general refuse from the operation of the Project, 0.011 tonnes of
metals, 0.08 tonnes of papers/cardboard packing and 0.037 tonnes of plastics
were sent to recyclers for recycling during the reporting period.
Findings of
Environmental Site Audit
A
summary of the monitoring activities undertaken in this reporting period is
listed below:
·
Joint Environmental Site Inspections |
3 times |
·
Landscape & Visual Inspections |
3 times |
Monthly
joint environmental site inspections were carried out. The environmental control/mitigation
measures (related to air quality, water quality, waste (including land
contamination prevention), hazard-to-life, and landscape and visual)
recommended in the approved EIA Report and the EM&A Manual were properly
implemented by the Contractor during the reporting month.
Environmental
Exceedance/Non-conformance/Compliant/Summons and Prosecution
Exceedances for
the air emission limits for the CHP and ASP stacks were recorded during the
reporting period.
No complaint/ summon/prosecution
was received in this reporting period.
Future Key
Issues
Activities to be undertaken in the
next reporting period include:
·
Operation of the Project; and
·
Tuning of CHPs by the Supplier; and
·
Repairing of the Chemical Scrubber 3.
ERM-Hong Kong, Limited (ERM) was
appointed by OSCAR Bioenergy Joint Venture (the Contractor) as the
Environmental Team (ET) to undertake the construction Environmental Monitoring
and Audit (EM&A) programme for the Contract No. EP/SP/61/10 of
Organic Waste Treatment Facilities Phase I, which the project name has
been updated to Organic Resources Recovery Centre (Phase I) (the Project)
since November 2017. ERM was also appointed by the Contractor to undertake
the operation EM&A programme starting 1 March 2019.
This is the 32nd
Quarterly EM&A report which summarises the monitoring results and audit
findings for the EM&A programme during the reporting period from 1 March
2023 to 31 May 2023.
The structure of the report is as
follows:
Section
1: Introduction
It details the
scope and structure of the report.
Section
2: Project Information
It
summarises the background and scope of the Project, site description, project
organisation and status of the Environmental Permits (EP)/licences.
Section
3: Environmental Monitoring and Audit Requirements
It summarises
the environmental monitoring requirements including monitoring parameters,
programmes, methodologies, frequency, locations, Action and Limit Levels,
Event/Action Plans, as well as environmental audit requirements as recommended
in the EM&A Manual and approved EIA report.
Section
4: Monitoring Results
It summarises
monitoring results of the reporting period.
Section
5: Site Audit
It summarises
the audit findings of the environmental as well as landscape and visual site
audits undertaken within the reporting period.
Section
6: Environmental Non-conformance
It summarises
any exceedance of environmental performance standard, environmental complaints
and summons received within the reporting period.
Section
7: Further Key Issues
It summarises
the impact forecast for the next reporting month.
Section
8: Conclusions
The Organic Resources Recovery
Centre (ORRC) Phase I development (hereinafter referred to as “the Project”) is
to design, construct and operate a biological treatment facility with a
capacity of about 200 tonnes per day and convert source-separated organic waste
from commercial and industrial sectors (mostly food waste) into compost and
biogas through proven biological treatment technologies. The location of the
Project site is shown in Annex
A.
The environmental
acceptability of the construction and operation of the Project had been
confirmed by findings of the associated Environmental Impact Assessment (EIA)
Study completed in 2009. The Director of Environmental Protection (DEP)
approved this EIA Report under the Environmental Impact Assessment Ordinance
(EIAO) (Cap. 499) in February 2010 (Register No.: AEIAR-149/2010) (hereafter referred to as the approved EIA Report).
Subsequent Report on Re-assessment on Environmental Implications and Report on
Re-assessment on Hazard to Life Implications were completed in 2013,
respectively.
An Environmental Permit
(EP) (No. EP-395/2010) was issued by
the DEP to the EPD (Project Team), the Permit Holder, on 21 June 2010 and
varied on 18 March 2013 (No. EP-395/2010/A) and 21 May 2013 (No.
EP-395/2010/B), respectively. The Design Build and Operate Contract for the
ORRC Phase 1 (Contract No. EP/SP/61/10 Organic Resources Recovery Centre (Phase
1) (the Contract)) was awarded to SITA Waste Services Limited, ATAL Engineering
Limited and Ros-Roca, Sociedad Anonima jointly
trading as the OSCAR Bioenergy Joint Venture (OSCAR or the Contractor). A
Further EP (No. FEP-01/395/2010/B) was issued by the DEP to the OSCAR on 16
February 2015. Variation to both EPs (Nos. EP-395/2010/B and FEP-01/395/2010/B)
were made in December 2015. The latest EPs, Nos. EP-395/2010/C and
FEP-01/395/2010/C, were issued by the DEP on 21 December 2015.
Under the requirements
of Condition 5 of the EP (No. FEP-01/395/2010/C), an Environmental Monitoring
and Audit (EM&A) programme as set out in the approved EM&A Manual
(hereinafter referred to as EM&A Manual) is required to be implemented
during the construction and operation of the Project. ERM-Hong Kong, Ltd (ERM)
has been appointed by OSCAR as the Environmental Team (ET) for the construction
phase EM&A programme and the Monitoring Team (MT) for the operation phase
EM&A programme for the implementation of the EM&A programme
in accordance with the requirements of the EP and the approved EM&A Manual.
The
construction works commenced on 21 May 2015. The operation phase of the
EM&A programme commenced on 1 March 2019 ([1]). The
construction phase EM&A programme was completed in the end of February
2020.
The Project Site is located at Siu
Ho Wan in North Lantau with an area of about 2 hectares. The layout of the
Project Site is illustrated in Annex
A. The facility received an average of 127.97 to 155 tonnes
and treated an average of 108.65 to 132.5 tonnes of source separated organic
waste per day during the reporting period.
A summary of the major activities
undertaken in the reporting period is shown in Table 2.1.
Table
2.1 Summary of Activities Undertaken
in the Reporting Period
Activities
Undertaken in the Reporting Period |
·
Systems
being operated – waste reception, pre-treatment, CAPCS extraction, the
digesters, the centrifuge, the composting tunnels, the desulphurisation, the
emergency flare, the CHPs, the ASP and the biological wastewater treatment
plant (about 127.97 – 155 t/d SSOW input); ·
Adjustment of temperature curves on the CHP3; ·
CHP2 was returned in operation instead of CHP3, by moving the throttle
valve from CHP3 to CHP2; ·
Back purging testing for CEMS; ·
VOC
calibration for CAPCS stack; ·
Emergency
repair of chemical scrubber fan; ·
Preparation
for QAL 2 on the CEMS system (April 2023 – May 2023);
·
SBR
3 and ASP plate heat exchanger cleaning; ·
Fire
Services System annual inspection; ·
CEMS
maintenance; ·
QAL
2 testing with 3rd Party Lab was conducted for MCS 1 and MCS 2; and ·
Replacement
of membrane diffusers for all of the SBR Tanks of
the Wastewater Treatment Plant was completed. |
The project organisation chart and
contact details are shown in Annex
B.
A summary of the valid permits,
licences, and/or notifications on environmental protection for this Project is
presented in Table 2.2.
Table
2.2 Summary of Environmental
Licensing, Notification and Permit Status
Permit/ Licences/ Notification |
Reference |
Validity Period |
Remarks |
Environmental Permit |
FEP-01/395/2010/C |
Throughout the Contract |
Permit granted on 21 December 2015 |
Notification of Construction Works under the Air
Pollution Control (Construction Dust) Regulation |
Ref No. 386715 |
Throughout the Contract |
- |
Effluent Discharge License |
WT00038391-2021 |
7 July 2021 – 30 June 2026 |
Approved on 7 July 2021 |
Chemical Waste Producer Registration |
WPN 5213-961-O2231-01 |
Throughout the Contract |
Approved on 29 April 2015 |
Chemical Waste Producer
Registration |
WPN 5213-961-O2231-02 |
Throughout the implementation of
the Project |
Approved on 10 November 2017 |
Waste Disposal Billing Account |
Account number: 702310 |
Throughout the Contract |
- |
The air quality
(including odour) monitoring to be carried out during the operation phase of
the Project are described below. Although water quality monitoring is not
required for the operation phase under the EM&A programme, there are water
quality monitoring requirement under the Water Discharge Licence of the plant
under the Water Pollution Control Ordinance (WPCO). As part of this
EM&A programme, the monitoring results will be reviewed to check the
compliance with the WPCO requirements.
According to the EM&A Manual
and EP requirements, stack monitoring is required during the operation phase of
the Project.
On-line monitoring (using
continuous environmental monitoring system (CEMS) shall be carried out for the
centralised air pollution unit (CAPCS), cogeneration units (CHP) and the
ammonia stripping plant (ASP) during the operation phase. The last
calibration was carried out from 24 to 26 April 2023; and the last maintenance
was carried out from 1 to 4 May 2023.
The monitoring data is transmitted
instantaneously to EPD (Regional Office) by telemetry system.
When the on-line monitoring for
certain parameter cannot be undertaken, monitoring will be carried out using
the following methodology approved by the EPD.
Table
3.1 Sampling and Laboratory Analysis
Methodology
Parameters |
Method |
Stacks to be Monitored |
Gaseous and vaporous organic substances (including methane) |
USEPA Method 18 |
·
CAPCS ·
CHP ·
ASP |
Particulate |
USEPA Method 5 |
·
CAPCS ·
CHP ·
ASP |
Carbon monoxide (CO) |
USEPA Method 10 |
·
CHP ·
ASP |
Nitrogen oxides (NOx) |
USEPA Method 7E |
·
CHP ·
ASP |
Sulphur dioxide (SO2); |
USEPA Method 6 |
·
CHP ·
ASP |
Hydrogen chloride (HCl) |
USEPA Method 26A |
·
CHP ·
ASP |
Hydrogen fluoride (HF) |
USEPA Method 26A |
·
CHP ·
ASP |
Oxygen (O2); |
USEPA Method 3A |
·
CAPCS ·
CHP ·
ASP |
Velocity and Volumetric Flow |
USEPA Method 2 |
·
CAPCS ·
CHP ·
ASP |
Ammonia (NH3) |
USEPA CTM 027 |
·
ASP |
Odour (including NH3 and H2S) |
EN 13725 |
·
CAPCS |
Water vapour content (continuous measurement of the water vapour
content should not be required if the sample exhaust gas is dried before the
emissions are analysed) |
USEPA Method 4 |
·
CAPCS ·
CHP ·
ASP |
Temperature |
USEPA Method 4 |
·
CAPCS ·
CHP ·
ASP |
With reference to the EM&A
Manual, the air emission of the stacks shall meet the following emission limits
as presented in Tables 3.2 to 3.5.
Table 3.2 Emission
Limit for CAPCS Stack
Parameter |
Emission Level (mg/Nm3) (a) |
VOCs (including methane) |
680 |
Dust (or Total Suspended Particulates (TSP)) |
6 |
Odour (including NH3 & H2S) |
220 (b) |
Notes:
(a)
Hourly average concentration (b)
The odour unit is OU/Nm3 |
Table
3.3 Emission Limit for CHP Stack
Parameter |
Maximum Emission Level (mg/Nm3) (a) (b) |
Dust (or Total Suspended Particulates) |
15 |
Carbon Monoxide |
650 |
NOx |
300 |
SO2 |
50 |
NMVOCs (c) |
150 |
VOCs (including methane) (d) |
1,500 |
HCl |
10 |
HF |
1 |
Notes:
(a) All values refer to an oxygen content in the exhaust gas of 6% and
dry basis. (b) Hourly average concentration (c) NMVOCs should be monitored by gas sampling and laboratory analysis
at an agreed interval. For the first 12 months (starting from August 2019),
monitoring should be carried out at quarterly intervals. The monitoring
frequency should then be reduced to half-yearly for next 12 months (starting
from August 2020). (d) The VOCs emission limit include methane as biogas is adopted as
fuel in the combustion process. |
Table 3.4 Emission
Limit for ASP Stack
Parameter |
Maximum Emission Level (mg/Nm3) (a) (b) |
Dust (or Total Suspended Particulates) |
5 |
Carbon Monoxide |
100 |
NOx |
200 |
SO2 |
50 |
VOCs (including methane) (c) |
20 |
NH3 |
35 |
HCl |
10 |
HF |
1 |
Notes: (a)
All values refer to an oxygen content in the exhaust gas of 11% and
dry basis. (b)
Hourly average concentration (c)
The VOCs emission limit include methane as biogas is adopted as fuel
in the combustion process. |
Table
3.5 Emission Limit for Standby Flaring Gas Unit ([2])
Parameter |
Maximum Emission level (mg/Nm3) (a) (b) |
Dust (or Total Suspended Particulates) |
5 |
Carbon Monoxide |
100 |
NOx |
200 |
SO2 |
50 |
VOCs (including methane) (c) |
20 |
HCl |
10 |
HF |
1 |
Notes: (a)
All values refer to an oxygen content in the exhaust gas of 11% and
dry basis. (b)
Hourly average concentration (c) The VOCs emission limit include methane as biogas is
adopted as fuel in the combustion process. |
To
determine the effectiveness of the proposed odour mitigation measures and to
ensure that the operation of the ORRC1 will not cause adverse odour impacts,
odour monitoring of the CAPCS stack (see Section 3.1.1) and odour patrol
will be carried out.
Odour patrol shall be conducted by
independent trained personnel/ competent persons in summer months (i.e., from
July to September) for the first two operational years of ORRC1 at monthly
intervals along an odour patrol route at the Project Site boundary as shown in Annex A.
The perceived odour intensity is
divided into 5 levels. Table 3.6 describes the odour intensity for
different levels.
Table 3.6 Odour
Intensity Level
Level |
Odour Intensity |
0 |
Not detected. No odour
perceived or an odour
so weak that it cannot be easily
characterised or described |
1 |
Slight identifiable odour, and slight chance
to have odour nuisance |
2 |
Moderate identifiable odour, and moderate chance to
have odour nuisance |
3 |
Strong identifiable odour, likely
to have odour nuisance |
4 |
Extreme severe odour, and unacceptable odour level |
Table 3.7
shows the action level and limit level to be used for odour patrol. Should any exceedance
of the action and limit levels occur, actions in accordance with the event and
action plan in Table 3.8 should be carried out.
Table 3.7 Action and
Limit Levels for Odour Nuisance
Parameter |
Action Level |
Limit Level |
Odour Nuisance (from odour patrol) |
When one documented compliant is received (a), or Odour Intensity
of 2 is measured
from odour patrol. |
Two or more documented complaints
are received (a) within a week; or Odour intensity of 3 or above is measured
from odour patrol. |
Note:
(a)
Once the complaint is received by the Project Proponent (EPD), the
Project Proponent would investigate and verify the complaint whether it is
related to the potential odour emission from the ORRC1 and its on-site
wastewater treatment unit. |
Table 3.8 Event and
Action Plan for Odour Monitoring
Event |
Action |
|
|
Person-in-charge of Odour Monitoring |
Project Proponent (a) |
Action Level |
|
|
Exceedance of action level (Odour Patrol) |
1. Identify source/reason of exceedance; 2. Repeat odour patrol to confirm finding. |
1. Carry out investigation to identify the source/reason of
exceedance. Investigation should be completed within 2 weeks; 2. Rectify any unacceptable practice; 3. Implement more mitigation measures if necessary; 4. Inform Drainage Services Department (DSD) or the operator of the
Siu Ho Wan Sewage Treatment Works (SHWSTW) if exceedance is
considered to be caused by the operation of the SHWSTW; and 5. Inform North Lantau Refuse Transfer Station (NLTS) operator if
exceedance is considered to be caused by the
operation of NLTS. |
Exceedance of action level (Odour Complaints) |
1. Identify source/reason of exceedance; 2. Carry out odour patrol to determinate odour intensity. |
1. Carry out investigation and verify the complaint whether it is
related to potential odour emission from the nearby SHWSTW; 2. Carry out investigation to identify the source/reason of
exceedance. Investigation should be completed within 2 weeks; 3. Rectify any unacceptable practice; 4. Implement more mitigation measures if necessary; 5. Inform DSD or the operator of the SHWSTW if exceedance is considered to be caused by the operation of the SHWSTW;
and 6. Inform NLTS operator if exceedance is considered
to be caused by the operation of NLTS. |
Limit Level |
|
|
Exceedance of limit level |
1. Identify source/reason of exceedance; 2. Inform EPD; 3. Repeat odour patrol to confirm findings; 4. Increase odour patrol frequency to bi-weekly; 5. Assess effectiveness of remedial action and keep EPD informed of
the results; 6. If exceedance stops, cease additional odour patrol. |
1. Carry out investigation to identify the source/reason of
exceedance. Investigation should be completed within 2 week; 2. Rectify any unacceptable practice; 3. Formulate remedial actions; 4. Ensure remedial actions properly implemented; 5. If exceedance continues, consider what more/enhanced mitigation
measures should be implemented; and 6. Inform DSD or the operator of the SHWSTW if exceedance is considered to be caused by the operation of the
SHWSTW. |
Note:
(a)
Project Proponent shall identify an implementation agent. |
·
Environmental mitigation measures (related to air
quality, water quality, waste, land contamination, hazard-to-life, and
landscape and visual) to be implemented during the operation phase of the
Project are recommended in the approved EIA Report and EM&A Manual and are
summarised in Annex C.
Monthly site audits for operation phase will be carried out to check the
implementation of these measures.
Compliance audits are to be
undertaken to ensure that a valid discharge licence has been issued by EPD
prior to the discharge of effluent from the operation of the Project site.
Under Effluent Discharge Licence WT00038391-2021 (effective from July 2021),
the effluent quality shall meet the discharge limits as described in Table
3.9 and Table 3.10.
Table 3.9 Discharge
Limits for Effluent from the Effluent Storage Tank (as stipulated in
WT00038391-2021)
Parameters |
Discharge Limit (mg/L) |
Flow Rate (m3/day) (a) |
645 |
pH (pH units) (b) |
6-10 (c) |
Suspended Solids (b) |
800 |
Biochemical Oxygen Demand (5 days, 20°) (b) |
800 |
Chemical Oxygen Demand (b) |
2,000 |
Oil & Grease (b) |
40 |
Total Nitrogen (b) |
200 |
Total Phosphorus (b) |
50 |
Surfactants (total) (b) |
25 |
Notes: (a) Flow
rate is not a parameter required to be monitored and reported by the
Contractor in accordance with Section B2 of the Effluent Discharge Licence
under the WPCO. (b) Parameters
required to be monitored and reported by the Contractor in accordance with
Section B2 of the Effluent Discharge Licence under the WPCO. (c) Range. |
Table 3.10
Discharge Limits for Effluent from the Petrol Interceptor(s)
(as stipulated in TW00038391-2021)
Parameters |
Discharge Limit (mg/L) |
Flow Rate (m3/day) (a) |
245 (a) |
Suspended Solids (b) |
30 |
Chemical Oxygen Demand (c) |
80 |
Oil & Grease (c) |
20 |
Surfactants (total) (b) |
15 |
Notes: (a)
The surface runoff flow rate limit was estimated by the overall yearly
rainfall data. As the actual flowrate from the petrol interceptors depends on
the weather condition instead of the performance of the petrol interceptor,
monitoring and reporting of this parameter is not required. Hence this
parameter is not reported in Table 4.10 and Table 4.11. (b)
Parameter not required to be reported in accordance with Section B2 of
the Effluent Discharge Licence under the WPCO. (c) Parameters required to be reported in accordance
with Section B2 of the Effluent Discharge Licence under the WPCO. |
In accordance with EM&A Manual,
the landscape and visual mitigation measures shall be implemented.
For operation phase, site
inspection shall be conducted once a month for the first year of operation of
the Project. All measures as stated in the implementation schedule of the
EM&A Manual (see Annex C),
including compensatory planting, undertaken by both the Contractor and the
specialist Landscape Sub-Contractor during the first year of the operation phase
shall be audited by a Registered Landscape Architect (RLA) to ensure compliance
with the intended aims of the measures and the effectiveness of the mitigation
measures.
The concentrations of concerned air
pollutants emitted from the stacks of the CAPCS, CHP, and ASP during the
reporting period are monitored on-line by the continuous environmental
monitoring system (CEMS). During the reporting period, the standby flare
operated on 28 March 2023 and 3 May 2023. The standby flare did not operate
during April 2023.
With reference to the emission
limits shown in Tables 3.2, 3.3 and 3.4, the hourly average
concentrations and the number of exceedances of the concerned air emissions
monitored for the CAPCS, CHP and ASP during this reporting period are presented
in Tables 4.1 to 4.5.
It should be noted that
measurements recorded under abnormal operating conditions, e.g., start up and
stopping of stacks and unstable operation, as well as test runs and
interference of sensor, are disregarded.
Table 4.1 Hourly
Average of Parameters Recorded for CAPCS
Parameter |
Range of Hourly Average Conc. (mg/Nm3) |
Emission Limit (mg/Nm3) |
Exceedance Identified |
Remarks |
VOCs (including methane) |
0.00 – 1714.29 |
680 |
Identified (b) |
Faulty sensor in March and April |
Dust (or TSP) |
0.00 – 0.22 |
6 |
Nil |
Nil |
Odour (including NH3 & H2S) (a) |
0.00 – 154.07 |
220 |
Nil |
Nil |
Note: (a)
The odour unit is OU/Nm3. (b)
Dates with exceedances on VOCs (including methane)
(number of exceedance on the day) were identified on 2 (14), 3 (12), 4 (5), 5
(5), 6 (2), 7 (9), 8 (4), 9 (6), 17 (7), 18 (3), 19 (4), 20 (24), 21 (24), 22
(19), 23 (24), 24 (17), 25 (24), 26 (20), 27 (16), 28 (12), 29 (24), 30 (15)
and 31 (15) March 2023; 1 (24), 2 (19), 3 (7), 4 (24), 5 (24), 6 (24), 7 (10),
10 (20), 11 (24), 12 (8), 13 (15), 14 (24), 15 (24), 16 (9), 17 (23), 18
(24), 19 (24), 20 (24), 21 (24), 22 (24), 23 (24), 24 (24), 25 (19), 26 (19),
27 (24), 28 (19), 29 (24) and 30 (8) April 2023. |
Table 4.2 Hourly Average of Parameters Recorded
for CHP 1
Parameter |
Range of Hourly Average Conc. (mg/Nm3)
(a) |
Max. Emission Limit (mg/Nm3) |
Exceedance Identified |
Remarks |
Dust (or TSP) |
0 -
132 |
15 |
Identified (c) |
System unstable (e.g., low efficiency, unstable
column temperature) |
Carbon Monoxide |
0 -
628 |
650 |
Nil |
Nil |
NOx |
0 –
704 |
300 |
Identified (d) |
System unstable (e.g., low efficiency, unstable
column temperature) |
SO2 |
0 – 1848 |
50 |
Identified (e) |
De-sulphurisation system tripped / Under Maintenance |
VOCs (including methane)
(b) |
0 - 12,808 |
1,500 |
Identified (f) |
System unstable (e.g., low efficiency, unstable column temperature) |
HCl |
0 - 9 |
10 |
Nil |
Nil |
HF |
0 - 1 |
1 |
Nil |
Nil |
Notes: (a)
All values refer to an oxygen content in the exhaust gas of 6%
and dry basis. (b)
The VOCs emission limit includes methane as biogas is adopted as fuel
in the combustion process. (c)
Date with exceedances on Dust (number of exceedances on that day) was
identified on 8 (1) May 2023. (d)
Dates with NOx exceedances (number of exceedances on the
day) were identified on 1 (24), 2 (24), 3 (21), 4
(24), 5 (24), 6 (21), 7 (24), 8 (20), 9 (12), 10 (19), 11 (13), 12 (7), 13
(11), 14 (20), 15 (12), 16 (13), 17 (16), 18 (8), 19 (1), 20 (13), 21 (22),
22 (17), 23 (24), 24 (16), 25 (3), 26 (2), 27 (3), 28 (5), 29 (20), 30 (21)
and 31 (20) March 2023; 1 (22), 2 (13), 3 (12), 4 (9), 5 (5), 6 (1), 7
(2), 8 (5), 9 (2), 12 (1), 13 (12), 14 (3), 15 (4), 17 (3), 18 (2), 19 (5),
20 (3), 21 (18), 22 (24), 23 (24), 24 (16), 25 (20), 26 (15), 27 (4), 28
(17), 29 (12) and 30 (23) April 2023; 1 (21), 2 (17), 3 (12), 4 (12), 5 (12),
6 (9), 7 (5), 8 (1), 10 (5), 11 (8), 13 (11), 14 (12), 15 (17), 16 (5), 17
(16), 18 (10), 19 (21), 20 (21), 21 (18), 22 (13), 23 (11), 24 (17), 25 (1),
30 (7) and 31 (1) May 2023. (e)Dates
with SO2 exceedances (number of exceedances on the day) were
identified on 1 (19), 2 (24), 3 (12), 4 (23), 5 (24), 6 (18), 7 (16), 8 (3),
9 (6), 12 (1), 21 (2), 29 (14), 30 (21) and 31 (17) March 2023; 1 (14), 2
(2), 9 (2), 12 (1), 13 (11), 14 (3), 15 (4), 17 (3), 18 (2), 19 (5), 20 (3),
21 (18), 22 (24), 23 (24), 24 (18), 25 (22), 26 (15), 27 (2) and 28 (9) April
2023 ;1 (1), 2 (1), 3 (4), 4 (3), 5 (5), 8 (1), 11 (6), 15 (1), 17 (2), 18
(1), 19 (7), 20 (13), 21 (1), 22 (9), 23 (9), 24 (17), 25 (1), 30 (2) and 31
(1) May 2023. (f) Dates with exceedances on VOC (number of exceedances
on the day) was identified on 8 (1) May 2023. |
Table 4.3 Hourly
Average of Parameters Recorded for CHP 2
Parameter |
Range of Hourly Average Conc. (mg/Nm3) (a) |
Max. Emission Limit (mg/Nm3) |
Exceedance Identified |
Remarks |
Dust (or TSP) |
0 – 183 |
15 |
Identified(c) |
System unstable (e.g., low efficiency, unstable column temperature) |
Carbon Monoxide |
0 – 4234 |
650 |
Nil |
Nil |
NOx |
0 – 571 |
300 |
Identified (d) |
System unstable (e.g., low efficiency, unstable column temperature) |
SO2 |
0 – 141 |
50 |
Identified (e) |
De-sulphurisation system tripped / Under Maintenance |
VOCs (including methane) (b) |
0 – 1483 |
1,500 |
Nil |
Nil |
HCl |
0 – 18 |
10 |
Identified (f) |
System unstable (e.g., low efficiency, unstable column temperature) |
HF |
0 – 7 |
1 |
Identified(g) |
System unstable (e.g., low efficiency, unstable column temperature) |
Notes: (a)
All values refer to an oxygen content in the exhaust gas of 6% and dry basis. (b)
The VOCs emission limit includes methane as biogas is adopted as fuel
in the combustion process. (c) Dates with exceedances on dust (number of
exceedances on that day) were identified on 17 (1) and 18 (1) April 2023; 8 (1)
May 2023. (d)
Dates with NOx exceedances (number of exceedances on the day) were
identified on 24 (4), 25 (20), 26 (21), 27 (21), 28 (15), 29 (10), 30 (20)
and 31 (17) March 2023; 1 (11), 2 (21), 3 (17), 4 (23), 5 (22), 6 (22), 7
(15), 8 (24), 9 (17), 10 (24), 11 (19), 12 (9), 13 (9), 14 (11), 15 (14), 16
(11), 17 (23), 18 (21), 19 (3), 20 (19), 21 (16), 22 (17), 23 (16), 24 (8),
25 (6), 26 (19), 27 (11), 28 (21), 29 (15) and 30 (1) April 2023; 1 (20), 2
(16), 3 (3), 4 (3), 5 (4), 6 (12), 7 (4), 8 (7), 9 (1), 10 (9), 11 (24), 12
(24), 13 (24), 14 (24), 15 (20), 16 (14), 17 (15), 18 (10), 19 (2), 20 (24),
21 (24), 22 (11), 23 (24), 24 (24), 25 (24), 26 (24), 27 (17), 28 (8), 29
(6), 30 (1) and 31 (5) May 2023. (e)Dates
with SO2 exceedances (number of exceedance on the day) were
identified on 24 (4), 25 (21), 26 (24), 27 (24), 28 (16), 29 (24), 30 (24)
and 31 (18) March 2023; 1 (8), 2 (17), 3 (16), 4 (13), 5 (10), 6 (24), 7
(18), 8 (22), 9 (16), 10 (24), 11 (24), 12 (24), 13 (22), 14 (24), 15 (21),
16 (24), 17 (20), 18 (22), 19 (2), 20 (10), 21 (11), 22 (6), 23 (8), 24 (18),
25 (10), 26 (4), 27 (1), 28 (3), 29 (11) and 30 (17) April 2023; 1 (4), 2
(4), 4 (2), 5 (5), 6 (1), 8 (6), 9 (20), 10 (3), 12 (1), 16 (1), 18 (1), 28
(3), 29 (3), 30 (1) and 31 (6) May 2023. (f) Date with HCl exceedance (number of exceedances on
that day) was identified on 17 (1) and 18 (1) April 2023. (g)
Dates with exceedances on HF (number of exceedances on that day) were
identified on 17 (1) April 2023. |
Table 4.4 Hourly
Average of Parameters Recorded for CHP 3
Parameter |
Range of Hourly Average Conc. (mg/Nm3) (a) |
Max. Emission Limit (mg/Nm3) |
Exceedances Identified |
Remarks |
Dust (or TSP) |
0 – 4 |
15 |
Nil |
Nil |
Carbon Monoxide |
0 – 88 |
650 |
Nil |
Nil |
NOx |
0 – 589 |
300 |
Identified (c) |
System unstable (e.g., low efficiency, unstable column temperature) |
SO2 |
0 – 109 |
50 |
Identified (d) |
Desulphurisation system tripped / Under Maintenance |
VOCs (including methane) (b) |
0 – 1,489 |
1,500 |
Nil |
Nil |
HCl |
0 – 10 |
10 |
Nil |
Nil |
HF |
0 – 1 |
1 |
Nil |
Nil |
Notes: (a) All values refer to an oxygen content in the exhaust gas of 6% and dry
basis. (b) The VOCs emission limit includes methane as biogas is adopted as fuel
in the combustion process. (c) Dates
with NOx exceedances (number
of exceedances on the day) were identified on2 (4), 3 (18), 4 (9), 5 (23), 6
(19), 8 (23), 9 (23), 10 (24), 11 (24), 12 (24), 13 (23), 14 (23), 15 (24),
16 (19), 17 (21), 18 (18), 19 (24), 20 (10), 21 (22), 22 (21), 23 (24) and 24
(7) March 2023; 21 (4), 22 (12), 23 (4), 24 (1), 25 (14), 26 (6), 27
(4), 28 (4), 29 (2) and 30 (15) May 2023. (d) Dates
with SO2 exceedances (number of
exceedance on the day) was identified on 2 (4), 3 (18), 4 (9), 5 (20), 6
(19), 8 (13), 9 (6), 10 (10), 11 (11), 12 (2), 13 (4), 14 (2), 16 (2), 17
(2), 18 (4), 19 (4), 20 (3), 21 (6), 22 (3), 23 (20) and 24 (7) March 2023; 21
(4), 22 (6), 25 (1), 26 (2), 27 (2), 28 (3), 29 (2) and 30 (5) May 2023. |
Table 4.5 Hourly
Average of Parameters Recorded for ASP
Parameter |
Range of Hourly Average Conc. (mg/Nm3) (a) |
Max. Emission Limit (mg/Nm3) |
Exceedances Identified |
Remarks |
Dust (or TSP) |
0 – 5 |
5 |
Nil |
Nil |
Carbon Monoxide |
0 – 186 |
100 |
Identified (c) |
System unstable (e.g., low efficiency, unstable column temperature) |
NOx |
0 – 1129 |
200 |
Identified (d) |
System unstable (e.g., low efficiency, unstable column temperature) |
SO2 |
0 – 417 |
50 |
Identified (e) |
De-sulphurisation system tripped / Under Maintenance |
VOCs (including methane) (b) |
0 – 20 |
20 |
Nil |
Nil |
NH3 |
0 – 797 |
35 |
Identified (f) |
System unstable (e.g., low efficiency, unstable
column temperature) |
HCl |
0 – 27 |
10 |
Identified (g) |
System unstable (e.g., low efficiency, unstable
column temperature) |
HF |
0 – 2 |
1 |
Identified (h) |
System unstable (e.g., low efficiency, unstable column temperature) |
Notes: (a) All
values refer to an oxygen content in the exhaust gas of 11% and dry basis. (b) The
VOCs emission limit include methane as biogas is adopted as fuel in the
combustion process. (c) Dates with
exceedances on CO (number of exceedances on the day) were identified on 29
(2) May 2023. (d) Dates with NOx exceedances (number
of exceedances on the day) were identified on 1 (1), 2 (4), 3 (5), 4 (3), 5
(10), 6 (14), 7 (12), 8 (7), 9 (1), 11 (1), 12 (3), 13 (1), 14 (4), 15 (2), 16
(4), 18 (9), 19 (2), 20 (6), 21 (4), 22 (5), 23 (14), 24 (16), 25 (5), 26
(5), 27 (7), 28 (7), 29 (9), 30 (6) and 31 (6) March 2023; 1 (13), 2
(3), 3 (5), 4 (8), 5 (3), 6 (11), 7 (17), 8 (14), 9 (9), 10 (8), 11 (12), 12
(13), 13 (6), 14 (15), 15 (11), 16 (2), 17 (1), 18 (9), 19 (2), 20 (4), 21
(2), 22 (2), 25 (2), 26 (1), 27 (2) and 28 (3) April 2023; 1 (4), 2 (7), 3
(9), 4 (20), 5 (18), 6 (24), 7 (23), 8 (6), 10 (5), 24 (1), 29 (3), 30 (4)
and 31 (5) May 2023. (e) Dates
with SO2 exceedances (number of exceedances on the day) were
identified on 3 (14), 4 (23), 5 (10), 6 (7), 7 (1),
11 (4), 12 (3), 13 (2), 15 (4), 16 (3), 19 (1), 20 (4), 21 (5), 22 (5), 23
(18), 24 (10), 25 (1), 26 (2), 27 (1), 28 (1), 29 (8), 30 (12) and 31 (2)
March 2023; 2 (6), 3 (1), 7 (2), 8 (2), 15 (2), 17 (2), 18 (2) and 27
(1) April 2023; 3 (1), 29 (1), 30 (1) and 31 (2) May 2023. (f) Dates with NH3
exceedances (number of exceedances on the day) were identified on 3 (5), 6 (1), 7 (2), 8 (2), 9 (9), 10 (6), 11 (3), 12
(10), 13 (2), 14 (5), 15 (10), 16 (12), 17 (4), 18 (3), 19 (22), 20 (22), 21
(14), 22 (15), 23 (22), 24 (20), 25 (22), 26 (17), 27 (17), 28 (14), 29 (10),
30 (9) and 31 (14) March 2023; 1 (12), 2 (9), 3 (17), 4 (1), 5 (3), 6
(16), 7 (19), 8 (15), 9 (17), 10 (18), 11 (17), 12 (13), 13 (5), 14 (1), 15
(10), 16 (16), 17 (22), 18 (22), 19 (6), 20 (16), 21 (12), 22 (14), 23 (24),
24 (17), 25 (7), 26 (5), 28 (3) and 29 (3) April 2023; 1 (1), 4 (1), 5 (1), 8
(9), 9 (24), 10 (16), 11 (23), 12 (19), 13 (18), 14 (22), 15 (9), 16 (22), 17
(14), 18 (18), 19 (14), 20 (22), 21 (1), 22 (8), 23 (16), 24 (14), 25 (9), 26
(9), 27 (1), 29 (6) and 30 (3) May 2023. (g) Date with exceedances on HCl (number of exceedances on the day) was
identified on 24 (1) March 2023 (h) Date
with exceedances on HF (number of exceedances on the day) was identified on
19 (1) May 2023. |
Table
4.6 Hourly Average of Parameters Recorded for the Standby
Flaring Gas Unit
Parameter |
Range of Hourly Average Conc. (mg/Nm3) (a)(c) |
Max. Emission Limit (mg/Nm3) |
Exceedances Identified |
Remarks (d) |
Dust (or TSP) |
0 – 0 |
5 |
Nil |
Nil |
Carbon Monoxide |
0 – 0 |
100 |
Nil |
Nil |
NOx |
0 – 30 |
200 |
Nil |
Nil |
SO2 |
0 – 0 |
50 |
Nil |
Nil |
VOCs (including methane) (b) |
0 – 0 |
20 |
Nil |
Nil |
HCl |
0 – 0 |
10 |
Nil |
Nil |
HF |
0 – 4 |
1 |
Identified (d) |
System unstable (e.g., low efficiency, unstable
column temperature) |
Notes: (a)
All values refer to an oxygen content in the exhaust gas of 11% and
dry basis. (b)
The VOCs emission limit include methane as biogas is adopted as fuel
in the combustion process. (c) During the reporting period,
the standby flare operated on 28 March 2023 and 3 May 2023. The standby flare
did not operate in April. (d)
Date with HF exceedances (number of exceedances on the day) were
identified on 28 (1) March 2023. |
No odour patrol was required to be
conducted for this reporting period.
Effluent discharge was sampled
monthly from the outlet chamber of the Effluent Storage Tank as stipulated in
the operation phase discharge licence. Discharge from the Petrol Interceptors
were sampled bi-monthly since July 2021 as stipulated in the operation phase
discharge licence. The results of the discharge samples from the outlet chamber
of the Effluent Storage Tank are recorded in Table 4.6 to 4.8.
The results of the discharge samples from the Petrol Interceptors are recorded
in Table 4.9 to 4.12.
Table 4.7 Results of
the Discharge Sample Collected from the Outlet Chamber of the Effluent Storage
Tank in March 2023
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Flow Rate (m3/day) (a) |
44 – 244 (e) |
645 |
Yes |
pH (pH units) (b) |
8.01 – 8.4 (e) |
6-10 (c) |
Yes |
Suspended Solids (b) (d) |
113 (d) |
800 |
Yes |
Biochemical Oxygen Demand (5 days, 20°) (b) (d) |
14 (d) |
800 |
Yes |
Chemical Oxygen Demand (b)
(d) |
984 (d) |
2,000 |
Yes |
Oil & Grease (b) (d) |
<5 (d) |
40 |
Yes |
Total Nitrogen (b) (d) |
430 (d) |
200 |
No(f) |
Total Phosphorus (b) (d) |
21.1 (d) |
50 |
Yes |
Surfactants (total) (b) (d) |
<1.0 (d) |
25 |
Yes |
Notes: (a)
Parameter not required to be reported in accordance with Section B2 of
the Effluent Discharge Licence under the WPCO. (b)
Parameters required to be reported in accordance with Section B2 of
the Effluent Discharge Licence under the WPCO. (c) Daily Range. (d)
Effluent sample collected on 9 March 2023. (e)Data
collected daily in the reporting month. (f) An unexpected surge of Kjedahl Nitrogen in Treated Effluent was observed,
leading to the high Total Nitrogen level in the Treated Effluent sampled on 9
March 2023. |
Table 4.8 Results of
the Discharge Sample Collected from the Outlet Chamber of the Effluent Storage
Tank in April 2023
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Flow Rate (m3/day) (a) |
14 – 201 (e) |
645 |
Yes |
pH (pH units) (b) |
7.41 – 9.00 (e) |
6-10 (c) |
Yes |
Suspended Solids (b) (d) |
77 (d) |
800 |
Yes |
Biochemical Oxygen Demand (5 days, 20°) (b) (d) |
18 (d) |
800 |
Yes |
Chemical Oxygen Demand (b)
(d) |
668 (d) |
2,000 |
Yes |
Oil & Grease (b) (d) |
<5 (d) |
40 |
Yes |
Total Nitrogen (b) (d) |
486 (d) |
200 |
No(f) |
Total Phosphorus (b) (d) |
25.5 (d) |
50 |
Yes |
Surfactants (total) (b) (d) |
<1.0 (d) |
25 |
Yes |
Notes: (a)
Parameter not required to be reported in accordance with Section B2 of
the Effluent Discharge Licence under the WPCO. (b)
Parameters required to be reported in accordance with Section B2 of
the Effluent Discharge Licence under the WPCO. (c) Daily Range. (d)
Effluent sample collected on 13 April 2023. (e)Data
collected daily in the reporting month. (f) An unexpected surge of Kjedahl Nitrogen in Treated Effluent was observed,
leading to the high Total Nitrogen level in the Treated Effluent sampled on
13 April 2023. |
Table 4.9 Results of the Discharge Sample
Collected from the Outlet Chamber of the Effluent Storage Tank in May 2023
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Flow Rate (m3/day) (a) |
0 - 161 (e) |
645 |
Yes |
pH (pH units) (b) |
7.32 – 8.6 (e) |
6-10 (c) |
Yes |
Suspended Solids (b) (d) |
293 (d) |
800 |
Yes |
Biochemical Oxygen Demand (5 days, 20°) (b) (d) |
70 (d) |
800 |
Yes |
Chemical Oxygen Demand (b)
(d) |
1,430 (d) |
2,000 |
Yes |
Oil & Grease (b) (d) |
<5 (d) |
40 |
Yes |
Total Nitrogen (b) (d) |
218 (d) |
200 |
No |
Total Phosphorus (b) (d) |
35.8 (d) |
50 |
Yes |
Surfactants (total) (b) (d) |
<1.0 (d) |
25 |
Yes |
Notes: (a)
Parameter not required to be reported in accordance with Section B2 of
the Effluent Discharge Licence under the WPCO. (b)
Parameters required to be reported in accordance with Section B2 of
the Effluent Discharge Licence under the WPCO. (c) Daily Range. (d)
Effluent sample collected on 5 May 2023. (e)Data
collected daily in the reporting month. |
Table 4.10
Results of the Discharge Sample from the Petrol Interceptor 1
on 20 April 2023
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Suspended Solids (b) |
35 (a) |
30 |
No |
Chemical Oxygen Demand (c) |
70 (a) |
80 |
Yes |
Oil & Grease (c) |
<5 (a) |
20 |
Yes |
Surfactants (total) (b) |
<1.0 (a) |
15 |
Yes |
Notes: (a)
Effluent sample collected on 20 April 2023. (b)
Parameter not required to be reported in accordance with Section B2 of
the Effluent Discharge Licence under the WPCO. (c) Parameters required to be reported in accordance
with Section B2 of the Effluent Discharge Licence under the WPCO. |
Table
4.11 Results of the
Discharge Sample from the Petrol Interceptor 2 on 20 April 2023
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Suspended Solids (b) |
19 (a) |
30 |
Yes |
Chemical Oxygen Demand (c) |
66 (a) |
80 |
Yes |
Oil & Grease (c) |
<5 (a) |
20 |
Yes |
Surfactants (total) (b) |
<1.0 (a) |
15 |
Yes |
Notes: (a)
Effluent sample collected on 20 April 2023. (b)
Parameter not required to be reported in accordance with Section B2 of
the Effluent Discharge Licence under the WPCO. (c) Parameters required to be reported in accordance
with Section B2 of the Effluent Discharge Licence under the WPCO. |
Wastes generated from the operation
of the Project include chemical waste, wastes generated from pre-treatment
process and general refuse([3]).
Reference has been made to the Monthly Summary Waste Flow Tables prepared by
the Contractor (see Annex D).
With reference to the relevant handling records and trip tickets of this
Project, the quantities of different types of waste generated from the
operation of the Project in the reporting period are summarised in Table
4.12.
Table 4.12
Quantities of Waste Generated from the Operation of the Project
Month / Year |
Chemical
Waste |
Waste
Generated from |
General
Refuse |
||
|
Disposal of
at CWTC |
Disposed of
at Landfill (a) |
Recycled (b) |
Disposed of
at Landfill (a) (e) |
Recycled (c) |
March 2023 |
0 L (d) |
682.0 tonnes |
0 tonnes |
3.11 tonnes (e) |
0.088 tonnes |
April 2023 |
0 L (d) |
578.51 tonnes |
0.26 tonnes |
2.42 tonnes (e) |
0.027 tonnes |
May 2023 |
0 L (d) |
662.27 tonnes |
0 tonnes |
2.88 tonnes (e) |
0.130 tonnes |
Notes: (a) Waste generated
from pre-treatment process and general refuse other than chemical waste and
recyclables were disposed of at NENT landfill by sub-contractors. (b)
Among waste generated from pre-treatment process, 0 tonnes of metals,
0.26 tonnes of papers/ cardboard packing and 0 tonnes of plastics were sent
to recyclers for recycling during the reporting period. (c) Among
general refuse, 0.011 tonnes of metals, 0.080 tonnes of papers/ cardboard
packing and 0.037 tonnes of plastics were sent to recyclers for recycling
during the reporting period. (d)
No chemical waste was disposed of at CWTC in from March to May 2023. (e)It was assumed that four 240-litre bins filled with 80% of general
refuse were collected at each collection. The general refuse density was
assumed to be around 0.15 kg/L. |
The
monthly inspections of the operation phase of the Project covered the operation
phase environmental site inspections. The inspections checked the
implementation of the recommended mitigation measures for air quality,
landscape and visual, water quality, waste (land contamination) and
hazard-to-life stated in the Implementation Schedule (see Annex C).
Follow-up
actions resulting from the site inspections were generally taken as reported by
the Contractor. The Contractor has implemented environmental mitigation
measures recommended in the approved EIA Report and EM&A Manual.
March
2023
The
monthly inspection of the operation phase of the Project on 29 March 2023
covered the operation phase environmental site audit. Joint site inspections
were conducted by representatives of the Contractor, IEC and the MT on 29 March
2023 as required for the operation of the Project.
April
2023
The
monthly inspection of the operation phase of the Project on 21 April 2023
covered the operation phase environmental site audit. Joint site inspections
were conducted by representatives of the Contractor, IEC and the MT on 21 April
2023 as required for the operation of the Project.
May
2023
The
monthly inspection of the operation phase of the Project on 23 May 2023 covered the
operation phase environmental site audit. Joint site inspections were conducted
by representatives of the Contractor, IEC and the MT on 23 May 2023 as required
for the operation of the Project.
It was confirmed that the necessary
landscape and visual mitigation measures during the operation phase as
summarised in Annex C
were generally implemented by the Contractor. No non-compliance in relation to
the landscape and visual mitigation measures was identified during the site
audits in this reporting period and therefore no further actions are required.
The ET/MT will keep track of the EM&A programme to check compliance with
environmental requirements and the proper implementation of all necessary
mitigation measures.
March
2023
Monthly inspection of the landscape and visual mitigation measures for
the operation phase of the Project was performed on 29 March 2023.
April
2023
Monthly inspection of the landscape and visual mitigation measures for
the operation phase of the Project was performed on 21 April 2023.
May 2023
Monthly inspection of the landscape and visual mitigation measures for
the operation phase of the Project was performed on 23 May 2023.
March 2023
Non-compliance of emission
limits of VOCs (including methane) from CAPCS, NOx and SO2
from the CHPs, NOx, SO2, NH3 and HCl from ASP,
HF from the Standby Flaring Gas Unit, and non-compliance of discharge limits of
Total Nitrogen from the Outlet Chamber of the Effluent Storage Tank were
recorded during the reporting period.
The Contractor has reviewed the organic waste treatment processes (i.e.,
waste reception, waste pre-treatment, anaerobic digesters, and composting
processes) and found that they were operated normally during the reporting
period. The Contractor has investigated the CHPs, the de-sulphurisation system,
the ASP and the Standby Flaring Gas Unit, the
potential causes for the exceedance were identified.
The Contractor has also
carried out investigation on the Outlet Chamber of the Effluent Storage Tank, and found that an unexpected surge of Kjeldahl
Nitrogen was observed in the Treated Effluent sampled on 9 March 2023, leading
to the high Total Nitrogen level.
The investigation reports of the above exceedances are presented in Annex F.
April 2023
Non-compliance of emission limits
of VOCs (including methane) from CAPCS, NOx and SO2 from
CHP 1, Dust, NOx, SO2, HCl and HF from CHP 2; NOx,
SO2 and NH3 from ASP; and
non-compliance of discharge limits of Total Nitrogen from the Outlet Chamber of
the Effluent Storage Tank were recorded during the reporting period.
The Contractor has reviewed the organic waste treatment processes (i.e.,
waste reception, waste pre-treatment, anaerobic digesters, and composting
processes) and found that they were operated normally during the reporting
period. The Contractor has investigated the CHPs, the de-sulphurisation system
and the ASP, the potential causes for the exceedance were identified.
The Contractor has also
carried out investigation on the Outlet Chamber of the Effluent Storage Tank, and found that an unexpected surge of Kjeldahl
Nitrogen was observed in the Treated Effluent sampled on 13 April 2023, leading
to the high Total Nitrogen level.
The investigation reports of the above exceedances are presented in Annex F.
May 2023
Non-compliance of emission limits
of Dust, VOCs, NOx and SO2 from CHP 1; Dust, NOx
and SO2 from CHP 2; NOx and SO2 from CHP 3;
CO, NOx, SO2, NH3 and HF from ASP and non-compliance of discharge limits of Total Nitrogen
from the Outlet Chamber of the Effluent Storage Tank were recorded
during the reporting period.
The Contractor investigated the
cause of the exceedances and found that the exceedance of Total Nitrogen from
the effluent discharge of the Effluent Storage Tank was potentially caused by
the poor performance of the Sequential Batch Reactor (SBR), leading to an
increased level of Total Nitrogen in the treated effluent sampled on 5 May
2023.
The Contractor has reviewed the organic waste treatment processes (i.e.,
waste reception, waste pre-treatment, anaerobic digesters, and composting
processes) and found that they were operated normally during the reporting
period. The Contractor has investigated the de-sulphurisation system, CHPs and
the ASP, the potential causes for the exceedance were identified.
The investigation reports of the above exceedances are presented in Annex F.
Activities to be undertaken for the
coming reporting period are:
·
Operation of the Project;
·
CEMS maintenance;
·
QAL 2 testing with 3rd Party Lab was
conducted for MCS 1 and MCS 2; and
·
Completing the replacement of membrane diffusers for all of the SBR Tanks of the Wastewater Treatment Plant.
This EM&A Report presents the
EM&A programme undertaken during the reporting period from 1 March to
31 May 2023 in accordance with EM&A Manual (Version F) and
requirements of EP (FEP-01/395/2010/C).
For the operation phase,
exceedances of the emission limits for stack monitoring (including CAPCS, CHP
and ASP stacks) were recorded under normal operating conditions during the
reporting period (see Table 8.1).
Table 8.1 Exceedances for
Stack Emissions
Stack |
Exceedances During the Reporting Period |
Centralised Air Pollution Control Unit (CAPCS) |
·
Exceeded emission limit of VOCs (including methane)
on 2, 3, 4, 6, 7, 8, 9, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30 and 31 March; 1, 2, 3, 4, 5, 6, 7, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 and 30
April 2023. |
Cogeneration Unit (CHP) 1 |
·
Exceeded emission limit of Dust on 8 May 2023. ·
Exceeded emission limit of NOx on 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 and 31 March; 1,
2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25,
26, 27, 28, 29 and 30 April; 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 14, 15, 16,
17, 18, 19, 20, 21, 22, 23, 24, 25, 30 and 31 May 2023. ·
Exceeded emission limit of SO2 on 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 21, 29, 30 and 31 March; 1,
2, 9, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27 and 28
April; 1, 2, 3, 4, 5, 8, 11, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30 and
31 May 2023. ·
Exceeded emission limit of VOC on 8 May 2023. |
Cogeneration Unit (CHP) 2 |
·
Exceeded emission limit of Dust on 17 and 18 April;
8 May 2023. ·
Exceeded emission limit of NOx on 24, 25, 26, 27, 28, 29, 30 and 31 March; 1 – 30
April; 1 – 31 May 2023. ·
Exceeded emission limit of SO2 on 24, 25, 26, 27, 28, 29, 30 and 31 March; 1 – 30
April; 1, 2, 4, 5, 6, 8, 9, 10, 12, 16, 18, 28, 29, 30 and 31 May 2023. ·
Exceeded emission limit of HCl on 17 and 18 April
2023. ·
Exceeded emission limit of HF on 17 April 2023. |
Cogeneration Unit (CHP) 3 |
·
Exceeded emission limit of NOx on 2, 3,
4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 and 24
March; 21, 22, 23, 24, 25, 26, 27, 28, 29 and 30 May 2023. ·
Exceeded emission limit of SO2 on 2, 3,
4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 23 and 24
March; 21, 22, 25, 26, 27, 28, 29 and 30 May 2023. |
Ammonia Stripping Plant (ASP) |
·
Exceeded emission limit of CO on 29 May 2023. ·
Exceeded emission limit of NOx
on 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30 and 31 March; 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 25, 26, 27 and 28 April; 1, 2, 3,
4, 5, 6, 7, 8, 10, 24, 29, 30 and 31 May 2023. ·
Exceeded emission limit of SO2
on 3, 4, 5, 6, 7, 11, 12, 13, 15, 16, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,
29, 30 and 31 March; 2, 3, 7, 8, 15, 17, 18 and 27 April; 3, 29, 30 and 31
May 2023. ·
Exceeded emission limit of NH3
(number of exceedances on the day) were identified on 3, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30
and 31 March; 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19, 20, 21, 22, 23, 24, 25, 26, 28 and 29 April; 1, 4, 5, 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29 and 30 May 2023.
·
Exceeded emission limit of HF on 19 May 2023. ·
Exceeded emission limit of HCl on 24
March 2023. |
Standby Flaring Gas Unit |
·
Exceeded emission limit of HF on 28
March 2023. |
Non-compliance of
emission limits of VOCs (including methane) from CAPCS, NOx and SO2
from the CHPs, HF from the Standby Flaring Gas Unit, and NOx, SO2,
NH3 and HCl from ASP were recorded in March 2023. The cause of
the exceedances of VOCs (including methane) is due to faulty sensor. The
exceedances of SO2 from CHPs and the ASP occurred due to tripping of the
de-sulphurisation system caused by the failure of one of the columns of the
system. The exceedance of NOx of CHPs, NOx, NH3
and HCl from ASP and HF from the Standby Flaring Gas Unit occurred due to
system instability caused by the ongoing performance optimisation of CHPs, ASP and Standby Flaring Gas Unit, resulting in a lowered
temperature of the system and the incomplete combustion of biogas.
Non-compliance of emission limits
of Dust, VOCs, NOx and SO2 from CHP 1; Dust, NOx
and SO2 from CHP 2; NOx and SO2 from CHP 3; and
CO, NOx, SO2, NH3 and HF from ASP were
recorded in May 2023. The exceedances of SO2 from the CHPs and ASP
occurred due to tripping of the de-sulphurisation system. The exceedances of
Dust, VOCs and NOx from CHPs and the exceedances of CO, NOx
and HF from ASP occurred due to system instability.
Table 8.2
Exceedances for Petrol Interceptor 1 and 2
Effluent Discharge Point |
Exceedances During the Reporting Period |
Outlet Chamber of the Effluent Storage Tank |
·
Exceeded discharge limit of Total Nitrogen on 9
March 2023, 13 April 2023, and 5 May 2023 |
Petrol Interceptor 1 |
·
Exceeded discharge limit of Suspended Solid on 20 April 2023. |
Non-compliance of discharge limit of Total Nitrogen from the Outlet
Chamber of the Effluent Storage Tank were recorded on 9 March, 13 April and 5 May 2023. The Contractor found that an
unexpected surge of Kjedahl Nitrogen in Treated
Effluent was observed, leading to the high Total Nitrogen level in the Treated
Effluent sampled on 9 March and 13 April 2023. The contractor also found that
poor performance of the Sequential Batch Reactor (SBR) leaded to an increased
level of Nitrogen in the Treated Effluent sampled on 5 May 2023.
Non-compliance
of discharge limit of Suspended Solids from Petrol Interceptor 1 was recorded
during 20 April 2023. The Contractor suspected that the reason for the
exceedances of the parameters was due to a lack of rainfall during the dry
season, leading to an increase in the level of the exceeded parameters. The
Contractor will further arrange a clean-up of the interceptors to make sure the
discharge effluents comply with the discharge limit.
The environmental control
/mitigation measures related to air quality, water quality, waste (including
land contamination prevention), hazard-to-life and landscape and visual
recommended in the approved EIA Report and the EM&A Manual were properly
implemented by the Contractor during the reporting period.
Monthly landscape and visual
monitoring were conducted in the reporting period. The necessary landscape and
visual mitigation measures recommended in the approved EIA Report were
generally implemented by the Contractor.
No complaint/summon/prosecution was
received.
|
|
([1])
As some of the minor items are yet to be closed out in March
2019, the construction phase EM&A programme and Operation Phase EM&A
programme were undertaking in parallel in March 2019.