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 Hourly Average of 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 8 December 2022
Table 4.11 Results of the Discharge Sample from the Petrol
Interceptor 1 on 23 February 2023
Table 4.12 Results of the Discharge Sample from the Petrol
Interceptor 2 on 8 December 2022
Table 4.13 Results of the Discharge Sample from the Petrol
Interceptor 2 on 23 February 2023
Table 4.14 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 31st
Quarterly Environmental Monitoring and Audit (EM&A) Report presenting the
EM&A works carried out during the period from 1 December 2022 to 28
February 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;
·
Setting adjustments of the CHP 2 engine to fine tune
and return the maximum loading of the engine to 1,500 kW;
·
Biogas bypass trials for preparing the Biogas Holder
replacement works;
·
Replacement works of biogas holder from 9 to 12
January 2023, with flare operated during the replacement works;
·
Fine tuning of the CHP temperature curves and PM; and
·
Repair of the VOC sensor for CAPCS.
Environmental Monitoring and Audit
Progress
Air
Quality Monitoring
Non-compliance
of emission limits of SO2 and NOx from the CHPs, HCl from
CHP 2, NOx, SO2 and NH3 from ASP and CO, NOx,
SO2, VOCs, HCl, and HF from Standby Flaring Gas Unit were recorded
during December 2022. 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 exceedances of HCl from CHP 2 in
mid-December occurred due to system instability. The exceedances of NOx
and NH3 from CHPs and ASP occurred due to system instability caused
by the ongoing performance optimisation of the ASP and CHPs, resulting in a
lowered temperature of the system and the incomplete combustion of biogas. The
exceedances of CO, NOx, SO2, VOCs, HCl, and HF from
Standby Flaring Gas Unit occurred due to the biogas bypass trial.
Non-compliance
of emission limits of NOx and SO2 from the CHPs, NOx,
SO2 and NH3 from ASP and CO, VOCs, HCl, and HF from
Standby Flaring Gas Unit were recorded during January 2023. 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 exceedances of NOx from CHPs in January 2023 occurred
due to insufficient feedstock. The exceedance of NOx, and NH3
from ASP occurred due to system instability caused by the ongoing performance
optimisation of the ASP, resulting in a lowered temperature of the system and
the incomplete combustion of biogas. The exceedances of CO, VOCs, HCl,
and HF from Standby Flaring Gas Unit occurred due to biogas bypass trial.
Non-compliance
of emission limits of NOx and SO2 from the CHPs, HCl from
CHP 1 and NOx, SO2, and NH3 from ASP were
recorded during February 2023. 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 exceedances of NOx, NH3,
and HCl from ASP occurred due to system instability caused by the ongoing
performance optimisation of the CHP 1 and ASP, resulting in a lowered
temperature of the system and the incomplete combustion of biogas.
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 Suspended Solids and Chemical Oxygen Demand from Petrol
Interceptor 1 and Chemical Oxygen Demand from Petrol Interceptor 2 were
recorded during February 2023. The exceedances of Suspended Solids and Chemical
Oxygen Demand occurred due to the dry season with less rainfall, resulting in
the discharge water containing higher concentrations for the exceeded
parameters.
Waste
generated from the operation of the Project includes chemical waste, waste
generated from pre-treatment process and general refuse.
6,740
L of chemical waste was collected during the reporting period by licenced waste
collector from the operation of the Project.
1891.71
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, 0.980 tonnes of
metals, 0.360 tonnes of papers/cardboard packing, and 0.021 tonnes of plastics
were sent to recyclers for recycling during the reporting period.
Around
8.98 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, 0.004 tonnes of metals, 0.044 tonnes of papers/cardboard packing and
0.065 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 |
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,
ASP stacks and Standby Flaring Gas Unit 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
·
SBR Cleaning and Diffuser Replacement works.
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 31st Quarterly
EM&A report which summarises the monitoring results and audit findings for
the EM&A programme during the reporting period from 1 December 2022 to
28 February 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 114.28 to 135.14
tonnes and treated an average of 95.48 to 112.14 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 waste water treatment
plant (about 114.28 – 135.14 t/d SSOW input); ·
Setting
adjustments of the CHP 2 engine to fine tune and return the maximum loading
of the engine to 1,500 kW; ·
Biogas
bypass trials for preparing the Biogas Holder replacement works; ·
Replacement
works of biogas holder from 9 to 12 January 2023, with flare operated during
the replacement works; ·
Fine
tuning of the CHPs temperature curves and PM; and ·
Repair
of VOC sensor for CAPCS. |
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 |
Effluent Discharge License |
WT00038391-2021 |
7 July 2021 – 30 June 2026 |
Approved on 7 July 2021 |
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 are 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. Calibration
was carried out in January 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, 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 occurs, 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 2, 8, 13, 14, 15, 16, 19, 21, 23, and 30 December 2022, as well as
on 5, 6, 9, 10, 11, and 12 January 2023. The standby flare did not operate
during February 2023.
With reference to the emission
limits shown in Tables 3.2, 3.3, 3.4 and 3.5, 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 4.6.
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 – 679.50 |
680 |
Nil |
Nil |
Dust (or TSP) |
0.00 – 0.40 |
6 |
Nil |
Nil |
Odour (including NH3 & H2S) (a) |
0.00 – 170.90 |
220 |
Nil |
Nil |
Note: (a)
The odour unit is OU/Nm3. (b)
The CEMS was under maintenance on 16 December 2022. |
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 -
15 |
15 |
Nil |
Nil |
Carbon Monoxide |
0 -
135 |
650 |
Nil |
Nil |
NOx |
0 –
565 |
300 |
Identified (c) |
System unstable (e.g., low efficiency, unstable
column temperature) |
SO2 |
0 – 353 |
50 |
Identified (d) |
De-sulphurisation system tripped / Under Maintenance |
VOCs (including methane) |
0 - 1,318 |
1,500 |
Nil |
Nil |
HCl |
0 - 16 |
10 |
Identified (e) |
System unstable (e.g., low efficiency, unstable column temperature) |
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 on 14 (11), 15 (22), 16 (24), 17 (4),
28 (11), 29 (10), and 30 (11) December 2022; 2 (2), 3 (1), 4 (1), 5 (2), 7
(2), 8 (13), 9 (13), 10 (14), 11 (15), 12 (1), 13 (19), 14 (13), 27 (8), 28
(24), 29 (24), 30 (24), and 31 (11) January 2023; 1 (11), 2 (7), 3 (3), 9
(1), 10 (2), 11 (12), 12 (24), 13 (24), 14 (24), 15 (24), 16 (19), 18 (19),
19 (23), 20 (16), 21 (11), 22 (24), 23 (14), 24 (24), 25 (10), 26 (14), 27
(24), and 28 (19) February 2023. (d)
Dates with SO2 exceedances (number of exceedances on the
day) were identified on 15 (1), 17 (2), 28 (8), 29 (13) and 30 (9) December
2022; 27 (4), 28 (11), 29 (15), 30 (24), and 31
(13) January 2023; 1
(11), 2 (7), 3 (3), 9 (1), 10 (1), 11 (6), 12 (9), 13 (8), 14 (2), 15 (11),
16 (8), 21 (6), 22 (24), 23 (13), 24 (21), 25 (8), 26 (6), 27 (11), and 28
(18) February 2023. (e)Date
with HCl exceedance (number of exceedances on that day) was identified on 13
(1) February 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 – 13 |
15 |
Nil |
Nil |
Carbon Monoxide |
0 – 405 |
650 |
Nil |
Nil |
NOx |
0 – 543 |
300 |
Identified (c) |
System unstable (e.g., low efficiency, unstable column temperature) |
SO2 |
0 – 345 |
50 |
Identified (d) |
De-sulphurisation system tripped / Under Maintenance |
VOCs (including methane) (b) |
0 – 989 |
1,500 |
Nil |
Nil |
HCl |
0 – 28 |
10 |
Identified (e) |
System unstable (e.g., low efficiency, unstable column temperature) |
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 on 1 (10), 2 (18), 3 (24), 4 (23), 5
(11), 6 (19), 7 (15), 8 (9), 9 (10), 10 (8), 11 (24), 12 (2), 13 (4), 17
(15), 18 (24), 19 (15), 20 (11), 21 (7), 22 (11), 23 (9), 25 (4), 26 (3), 27
(24), 28 (8) and 30 (3) December 2022; 1 (24), 2 (24), 3 (24), 4 (19), 5
(24), 6 (19), 7 (24), 8 (24), 9 (12), 10 (3), 11 (1), 12 (13), 13 (2), 16
(7), 17 (24), 18 (24), 19 (24), 20 (24), 21 (14), 23 (20), 24 (24), 25 (24),
26 (24), 27 (14), 29 (1), and 31 (6) January 2023; 3 (19), 4 (24), 5 (24), 6
(24), 7 (22), 8 (24), 9 (24), 10 (24), 11 (13), 16 (4), 17 (24), 18 (21), 19
(18), 20 (23), 21 (19), 23 (12), and 24 (1) February 2023. (d)
Dates with SO2 exceedances (number of exceedance on the day)
were identified on 1 (18), 2 (15), 3 (15), 4 (12), 5 (1), 13 (2), 17 (15), 18
(17), 19 (7), 20 (5), 21 (5), 22 (9), 23 (9), 25 (14), 26 (4), 27 (24), 28
(8), 30 (11), and 31 (24) December 2022; 1 (24), 2 (24), 3 (24), 4 (19), 5
(24), 6 (14), 7 (12), 8 (17), 9 (11), 10 (3), 11 (1), 12 (9), 16 (7), 17
(24), 18 (22), 19 (18), 20 (13), 23 (20), 24 (24), 25 (24), 26 (24), 27 (14),
29 (1), and 31 (6) January 2023; 3 (19), 4 (24), 5 (24), 6 (24), 7 (24), 8
(23), 9 (24), 10 (23), 11 (14), 16 (2), 17 (10), 18 (7), 20 (15), 21 (22), 23
(6), and 24 (1) February 2023. (e)Date
with HCl exceedance (number of exceedances on that day) was identified on 19
(4) December 2022. |
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 – 7 |
15 |
Nil |
Nil |
Carbon Monoxide |
0 – 81 |
650 |
Nil |
Nil |
NOx |
0 – 592 |
300 |
Identified (c) |
System unstable (e.g., low efficiency, unstable column temperature) |
SO2 |
0 – 203 |
50 |
Identified (d) |
Desulphurisation system tripped / Under Maintenance |
VOCs (including methane) (b) |
0 – 1,018 |
1,500 |
Nil |
Nil |
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) Dates with NOx exceedances (number
of exceedances on the day) were identified on 20 (2), 21 (5), 22 (11), 23
(10), 24 (14), 25 (8), 26 (6), 28 (1), 29 (6), and 30 (6) December 2022; 14
(8), 15 (24), 16 (11), 21 (7), and 22 (16) January 2023; 12 (1), 13 (10), 14
(19), 15 (21), 16 (7), 17 (2), 22 (2), 24 (1), 25 (4), 27 (3), and 28 (4)
February 2023. (d)Dates
with SO2 exceedances (number of
exceedance on the day) was identified on 20 (4), 21 (3), 22 (8), 23 (2), 24
(21), 25 (14), 26 (21), 28 (2), 29 (10), and 30 (6) December 2022; 14 (3), 15
(18), 16 (6) and, 22 (1) January 2023; 11 (4), 12 (3), 13 (7), 14 (4), 15
(10), 16 (4), 17 (2), 22 (3), 24 (1), 25 (8), and 28 (4) February 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 – 2 |
5 |
Nil |
Nil |
Carbon Monoxide |
0 – 94 |
100 |
Nil |
Nil |
NOx |
0 – 641 |
200 |
Identified (c) |
System unstable (e.g., low efficiency, unstable column temperature) |
SO2 |
0 – 440 |
50 |
Identified (d) |
Desulphurisation system tripped |
VOCs (including methane) (b) |
0 – 20 |
20 |
Nil |
Nil |
NH3 |
0 – 326 |
35 |
Identified (e) |
System unstable (e.g., low efficiency, unstable column temperature) |
HCl |
0 – 2 |
10 |
Nil |
Nil |
HF |
0 – 1 |
1 |
Nil |
Nil |
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 NOx
exceedances (number of exceedances on the day) were
identified on 2 (2), 3 (9), 4 (11), 5 (3), 6 (4), 8 (6), 9 (2), 10 (1), 12
(2), 13 (1), 14 (2), 16 (3), 17 (3), 18 (4), 19 (1), 21 (6), 22 (1), 27 (1),
28 (1), and 31 (1) December 2022; 2 (2), 3 (1), 6 (2), 8 (2), 12 (3), 13
(10), 14 (13), 15 (6), 16 (2), 18 (2), 20 (1), 22 (6), 23 (13), 24 (4), 25
(2), 26 (12), 27 (12), 28 (9), 29 (7), 30 (23), and 31 (17) January 2023; 1
(1), 2 (7), 3 (18), 6 (5), 7 (1), 12 (3), 13 (4), 14 (6), 15 (3), 16 (11), 22
(2), 23 (1), 24 (3), 25 (3), 26 (11), 27 (4) and 28 (1) February 2023. (d)
Dates with SO2 exceedances (number of exceedances on the
day) were identified on 8 (1), 20 (4), 29 (4), and 31 (2) December 2022; 6
(1), 28 (8), 29 (18), 30 (24), and 31 (20) January 2023; 1 (10), 10 (1), 12
(1), 25 (1), and 26 (1) February 2023. (e)Dates
with NH3 exceedances (number of exceedances on the day) were
identified on 1 (6), 3 (1), 5 (3), 6 (1), 8 (1), 9 (1), 10 (4), 13 (1), 14
(1), 15 (1), 18 (3), 19 (3), 21 (4), 23 (2), 24 (4), 25 (5), 26 (1), 27 (4),
and 29 (2) December 2022; 1 (7), 2 (4), 3 (5), 4 (11), 5 (10), 6 (21), 7
(12), 9 (14), 10 (6), 11 (11), 12 (5), 13 (1), 19 (1), 20 (5), 23 (2), 27
(2), and 31 (1) January 2023; 1 (3), 2 (1), 7 (2), 8 (6), 9 (7), 10 (14), 11
(18), 12 (3), 13 (12), 14 (6), 15 (1), 16 (11), 17 (24), 18 (24), 19 (23), 20
(24), 21 (19), 22 (24), 23 (16), 24 (21), 25 (21), 26 (14), 27 (21), and 28
(11) February 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 – 1,217 |
100 |
Identified (e) |
Nil |
NOx |
0 – 581 |
200 |
Identified (f) |
Nil |
SO2 |
0 – 271 |
50 |
Identified (g) |
Nil |
VOCs (including methane) (b) |
0 – 3,758 |
20 |
Identified (h) |
Nil |
HCl |
0 – 50 |
10 |
Identified (i) |
Nil |
HF |
0 – 6 |
1 |
Identified (j) |
Nil |
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 2, 8, 13, 14, 15, 16, 19, 21, 23, and 30 December 2022, as well
as on 5, 6, 9, 10, 11, and 12 January 2023. (d)
All exceedances of the parameters on 2, 8, 13, 14, 15, 16, 19, 21, 23,
and 30 December 2022, as well as on 5, 6, 9, 10, 11, and 12 January 2023 were
caused by the biogas bypass trial conducted during this reporting period. (e)Dates
with Carbon Monoxide exceedances (number of exceedances on the day) were
identified on 8 (2), 13 (2), 14 (1), 15 (2), 16 (2), 19 (1), and 21 (2)
December 2022; 5 (3), 9 (2), and 11 (1) January 2023. (f) Dates with NOx exceedances (number of
exceedances on the day) were identified on 21 (1) 2022. (g)
Date with SO2 exceedances (number of exceedances on the
day) were identified on 13 (1), 14 (1), 15 (2), 16 (1), 19 (1) and 21 (2)
December 2022. (h)
Date with VOCs exceedances (including methane) (number of exceedances
on the day) were identified on 8 (2), 13 (2), 14 (1), 15 (2), 16 (2), 19 (1),
21 (2), and 30 (1) December 2022; 5 (3), 9 (8), 10 (20), 11 (21), and 12 (8)
January 2023. (i) Date with HCl exceedances (number
of exceedances on the day) were identified on 13 (1), 14 (1), 15 (2), 16 (1),
and 21 (2) December 2022; 5 (1) January 2023. (j) Date with HF exceedances (number
of exceedances on the day) were identified on 2 (2), 8 (2), 13 (2), 14 (1),
15 (2), 16 (2), 19 (1), 21 (2), and 30 (2) December 2022; 5 (3), 9 (5), 11
(1), and 12 (2) January 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 4.7 to 4.9.
The results of the discharge samples from the Petrol Interceptors are recorded
in Table 4.10 to 4.13.
Table 4.7 Results of
the Discharge Sample Collected from the Outlet Chamber of the Effluent Storage
Tank in December 2022
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Flow Rate (m3/day) (a) |
56 - 255 (e) |
645 |
Yes |
pH (pH units) (b) |
7.89 – 9.13 (e) |
6-10 (c) |
Yes |
Suspended Solids (b) (d) |
114 (d) |
800 |
Yes |
Biochemical Oxygen Demand (5 days, 20°) (b) (d) |
23 (d) |
800 |
Yes |
Chemical Oxygen Demand (b)
(d) |
795 (d) |
2,000 |
Yes |
Oil & Grease (b) (d) |
<5 (d) |
40 |
Yes |
Total Nitrogen (b) (d) |
67.70 (d) |
200 |
Yes |
Total Phosphorus (b) (d) |
15.80 (d) |
50 |
Yes |
Surfactants (total) (b) (d) |
<1.00 (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 8 December 2022. (e) Data collected daily in
the reporting month. |
Table 4.8 Results of
the Discharge Sample Collected from the Outlet Chamber of the Effluent Storage
Tank in January 2023
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Flow Rate (m3/day) (a) |
58 - 218
(e) |
645 |
Yes |
pH (pH units) (b) |
7.59 – 8.36
(e) |
6-10 (c) |
Yes |
Suspended Solids (b) (d) |
111 (d) |
800 |
Yes |
Biochemical Oxygen Demand (5 days, 20°) (b) (d) |
72 (d) |
800 |
Yes |
Chemical Oxygen Demand (b)
(d) |
976
(d) |
2,000 |
Yes |
Oil & Grease (b) (d) |
<5 (d) |
40 |
Yes |
Total Nitrogen (b) (d) |
66.9 (d) |
200 |
Yes |
Total Phosphorus (b) (d) |
10.5
(d) |
50 |
Yes |
Surfactants (total) (b) (d) |
1.9
(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 19 January 2023. (e) Data collected daily
in the reporting month. |
Table 4.9 Results of the Discharge Sample
Collected from the Outlet Chamber of the Effluent Storage Tank in February 2023
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Flow Rate (m3/day) (a) |
63 – 266
(e) |
645 |
Yes |
pH (pH units) (b) |
8.04 – 8.76 (e) |
6-10 (c) |
Yes |
Suspended Solids (b) (d) |
62 (d) |
800 |
Yes |
Biochemical Oxygen Demand (5 days, 20°) (b) (d) |
16 (d) |
800 |
Yes |
Chemical Oxygen Demand (b)
(d) |
889
(d) |
2,000 |
Yes |
Oil & Grease (b) (d) |
<5 (d) |
40 |
Yes |
Total Nitrogen (b) (d) |
75.30 (d) |
200 |
Yes |
Total Phosphorus (b) (d) |
10.90 (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 28 February 2023. (e) Data collected daily in
the reporting month. |
Table 4.10 Results of the Discharge
Sample from the Petrol Interceptor 1 on 8 December 2022
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Suspended Solids (b) |
8 (a) |
30 |
Yes |
Chemical Oxygen Demand (c) |
14 (a) |
80 |
Yes |
Oil & Grease (c) |
<5 (a) |
20 |
Yes |
Surfactants (total) (b) |
<1.0 (a) |
15 |
Yes |
Notes: (a) Effluent
sample collected on 8 December 2022. (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 1 on 23 February 2023
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Suspended Solids (b) |
46 (a) |
30 |
No |
Chemical Oxygen Demand (c) |
102
(a) |
80 |
No |
Oil & Grease (c) |
6 (a) |
20 |
Yes |
Surfactants (total) (b) |
<1.0 (a) |
15 |
Yes |
Notes: (a) Effluent
sample collected on 23 February 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 4.12 Results of the Discharge
Sample from the Petrol Interceptor 2 on 8 December 2022
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Suspended Solids (b) |
4 (a) |
30 |
Yes |
Chemical Oxygen Demand (c) |
22 (a) |
80 |
Yes |
Oil & Grease (c) |
<5 (a) |
20 |
Yes |
Surfactants (total) (b) |
<1.0 (a) |
15 |
Yes |
Notes: (a) Effluent
sample collected on 8 December 2022. (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 4.13 Results of the Discharge Sample from
the Petrol Interceptor 2 on 23 February 2023
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Suspended Solids (b) |
17 (a) |
30 |
Yes |
Chemical Oxygen Demand (c) |
297 (a) |
80 |
No |
Oil & Grease (c) |
<5 (a) |
20 |
Yes |
Surfactants (total) (b) |
2.0 (a) |
15 |
Yes |
Notes: (a)
Effluent sample collected on 23 February 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. |
Non-compliance of discharge limits
of Suspended Solids and Chemical Oxygen Demand from Petrol Interceptor 1 and
Chemical Oxygen Demand from Petrol Interceptor 2 were recorded during the
reporting period. The exceedances of Suspended Solids and Chemical Oxygen
Demand occurred due to the dry season with less rainfall, resulting in
discharge water containing higher concentrations for the exceeded parameters.
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
4.14.
Table 4.14 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) |
December 2022 |
0 L |
666.42 tonnes |
0.000 tonnes |
3.57 tonnes |
0.091 tonnes |
January 2023 |
1,200 L (d) |
581.54 tonnes |
1.001 tonnes |
2.65 tonnes |
0.004 tonnes |
February 2023 |
5,540 L (d) |
643.75 tonnes |
0.360 tonnes |
2.76 tonnes |
0.018 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, 0.980 tonnes of
metals, 0.360 tonnes of papers/ cardboard packing and 0.021 tonnes of
plastics were sent to recyclers for recycling during the reporting period. (c) Among
general refuse, 0.004 tonnes of metals, 0.044 tonnes of papers/ cardboard
packing and 0.065 tonnes of plastics were sent to recyclers for recycling
during the reporting period. (d)
1,200 L of spent lube oil were disposed of at CWTC in January 2023,
and 5,540 L of chemical waste was disposed of at CWTC in February 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.
December
2022
The
monthly inspection of the operation phase of the Project on 21 December 2022
covered the operation phase environmental site audit. Joint site inspections
were conducted by representatives of the Contractor, IEC and the MT on 21
December 2022 as required for the operation of the Project.
January
2023
The
monthly inspection of the operation phase of the Project on 30 January 2023
covered the operation phase environmental site audit. Joint site inspections
were conducted by representatives of the Contractor, IEC and the MT on 30
January 2023 as required for the operation of the Project.
February
2023
The
monthly inspection of the operation phase of the Project on 28 February 2023 covered the
operation phase environmental site audit. Joint site inspections were conducted
by representatives of the Contractor, IEC and the MT on 28 February 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.
December
2022
Monthly inspection of the landscape and visual mitigation measures for
the operation phase of the Project was performed on 21 December 2022.
January
2023
Monthly inspection of the landscape and visual mitigation measures for
the operation phase of the Project was performed on 30 January 2023.
February 2023
Monthly inspection of the landscape and visual mitigation measures for
the operation phase of the Project was performed on 28 February 2023.
December 2022
Non-compliance of emission limits of SO2 and NOx
from the CHPs; HCl from CHP2; NOx, SO2 and NH3
from ASP; and CO, NOx, SO2, VOCs, HCl, and HF from
Standby Flaring Gas Unit 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 investigation reports of the above exceedances are presented in Annex F.
January 2023
Non-compliance of emission limits of NOx and SO2
from the CHPs; NOx, SO2 and NH3 from ASP; and
CO, VOCs, HCl and HF from Standby Flaring Gas Unit 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 investigation reports of the above exceedances are presented in Annex F.
February 2023
Non-compliance of emission limits of NOx and SO2
from the CHPs; HCl from CHP 1; NOx, SO2 and NH3
from ASP, and non-compliance of discharge limits of Suspended Solids and
Chemical Oxygen Demand from Petrol Interceptor 1 and Chemical Oxygen Demand
from Petrol Interceptor 2 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 de-sulphurisation system, CHPs and
the ASP, the potential causes for the exceedance were identified.
The Contractor has also carried out checking on the relevant Petrol
Interceptors and suspected that the exceedances of Suspended Solids and
Chemical Oxygen Demand may have occurred due to the dry season with less
rainfall, resulting in discharge water containing higher concentrations for the
exceeded parameters.
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; and
·
SBR Cleaning and Diffuser replacement works.
This EM&A Report presents the
EM&A programme undertaken during the reporting period from December 2022
to February 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,
ASP and Standby Flaring Gas Unit 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) |
·
Nil |
Cogeneration Unit (CHP) 1 |
·
Exceeded emission limit of NOx on 14, 15,
16, 17, 28, 29, and 30 December 2022; 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13,
14, 27, 28, 29, 30, and 31 January 2023; 1, 2, 3, 9, 10, 11, 12, 13, 14, 15,
16, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, and 28 February 2023. ·
Exceeded emission limit of SO2 on 15, 17,
28, 29, and 30 December 2022; 27, 28, 29, 30, and 31 January 2023; 1, 2, 3,
9, 10, 11, 12, 13, 14, 15, 16, 21, 22, 23 24, 25, 27, and 28 February 2023. ·
Exceeded emission limit of HCl on 13 February 2023. |
Cogeneration Unit (CHP) 2 |
·
Exceeded emission limit of NOx on 1, 2,
3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27,
28, and 30 December 2022; 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 17,
18, 19, 20, 21, 23, 24, 25, 26, 27, 29, and 31 January 2023; 3, 4, 5, 6, 7, 8,
9, 10, 11, 16, 17, 18, 19, 20, 21, 23, and 24 February 2023. ·
Exceeded emission limit of SO2 on 1, 2,
3, 4, 5, 13, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 30, and 31 December
2022; 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 16, 17, 18, 19, 20, 23, 24, 25,
26, 27, 29, and 31 January 2023; 3, 4, 5, 6, 7, 8, 9, 10, 11, 16, 17, 18, 20,
21, 23, and 24 February 2023. ·
Exceeded emission limit of HCl on 19 December 2022. |
Cogeneration Unit (CHP) 3 |
·
Exceeded emission limit of NOx on 20, 21,
22, 23, 24, 25, 26, 28, 29, and 30 December 2022; 14,
15, 16, 21, and 22 January 2023; 12, 13, 14, 15, 16, 17, 22, 24, 25, 27, and
28 February 2023. ·
Exceeded emission limit of SO2 on 20, 21,
22, 23, 24, 25, 26, 28, 29 and 30 December 2022; 14,
15, 16 and 22 January 2023; on 11, 12, 13, 14, 15, 16, 17, 22, 24, 25, and 28
February 2023. |
Ammonia Stripping Plant (ASP) |
·
Exceeded emission limit of NOx on 2, 3,
4, 5, 6, 8, 9, 10, 12, 13, 14, 16, 17, 18, 19, 21, 22, 27, 28, and 31
December 2022; 2, 3, 6, 8, 12, 13, 14, 15, 16, 18,
20, 22, 23, 24, 25, 26, 27, 28, 29, 30, and 31 January 2023; 1, 2, 3,
6, 7, 12, 13, 14, 15, 16, 22, 23, 24, 25, 26, 27, and 28 February 2023. ·
Exceeded emission limit of SO2 on 8, 20,
29, and 31 December 2022; 6, 28, 29, 30, and 31 January 2023; 1, 10, 12, 25,
and 26 February 2023. ·
Exceeded emission limit of NH3 on 1, 3,
5, 6, 8, 9, 10, 13, 14, 15, 18, 19, 21, 23, 24, 25, 26, 27, and 29 December
2022; 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 19, 20, 23, 27, and 31 January
2023; 1, 2, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, and 28 February 2023. |
Standby Flaring Gas Unit |
·
Exceeded emission limit of Carbon Monoxide on 8, 13,
14, 15, 16, 19, and 21 December 2022; 5, 9, and 11 January 2023. ·
Exceeded emission limit of NOx on 21 December 2022; ·
Exceeded emission limit of SO2 on 13, 14,
15, 16, 19, and 21 December 2022; ·
Exceeded emission limit of VOCs on 8, 13, 14, 15,
16, 19, 21, and 30 December 2022; 5, 9, 10, 11, and 12 January 2023. ·
Exceeded emission limit of HCL on 13, 14, 15, 16,
and 21 December 2022; 5 January 2023. ·
Exceeded emission limit of HF on 2, 8, 13, 14, 15,
16, 19, 21, and 30 December 2022; 5, 9, 11, and 12 January 2023. |
Non-compliance of emission limits
of SO2 and NOx from the CHPs, HCl from CHP2, NOx,
SO2 and NH3 from ASP and CO, NOx, SO2,
VOCs, HCl and HF from Standby Flaring Gas Unit were recorded during December
2022. 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 exceedances of HCl from CHP 2 in mid-December occurred due
to system instability. The exceedance of NOx and NH3 from
CHPs and ASP occurred due to system instability caused by the ongoing
performance optimisation of the ASP and CHPs, resulting in a lowered
temperature of the system and the incomplete combustion of biogas. The
exceedances of CO, NOx, SO2, VOCs, HCl and HF from
Standby Flaring Gas Unit occurred due to the biogas bypass trial.
Non-compliance of
emission limits of NOx and SO2 from the CHPs, NOx,
SO2, NH3 from ASP and CO, VOCs, HCl and HF from Standby
Flaring Gas Unit were recorded during January 2023. 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 exceedances of
NOx from CHPs in January 2023 occurred due to insufficient
feedstock. The exceedance of NOx and NH3 from ASP
occurred due to system instability caused by the ongoing performance
optimisation of the ASP, resulting in a lowered temperature of the system and
the incomplete combustion of biogas. The exceedances of CO, VOCs, HCl and HF
from Standby Flaring Gas Unit occurred due to biogas bypass trial.
Non-compliance of
emission limits of NOx and SO2 from the CHPs, HCl from
CHP 1 and NOx, SO2 and NH3 from ASP were
recorded during February 2023. 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, NH3
and HCl from ASP occurred due to system instability caused by the ongoing
performance optimisation of the CHP 1 and ASP, resulting in a lowered
temperature of the system and the incomplete combustion of biogas.
Table 8.2 Exceedances
for Petrol Interceptor 1 and 2
Effluent Discharge Point |
Exceedances During the Reporting Period |
Petrol Interceptor 1 |
·
Exceeded discharge limit of Suspended Solid on 23
February 2023. ·
Exceeded discharge limit of Chemical Oxygen Demand
on 23 February 2023. |
Petrol Interceptor 2 |
·
Exceeded discharge limit of Chemical Oxygen Demand
on 23 February 2023. |
There
were no exceedances recorded during December 2022. However, non-compliance of
discharge limit of Suspended Solids and Chemical Oxygen Demand from Petrol
Interceptor 1 and Chemical Oxygen Demand from Petrol Interceptor 2 were
recorded during February 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.