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 and Deficiencies
6.1
Summary of Environmental
Non-Compliance and Deficiencies
6.2
Summary of Environmental
Complaint
6.3
Summary of Environmental
Summon and Successful Prosecution
7.1
Key Issues for the Coming
Month
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 3.9 Discharge Limits for Effluent from the
Outlet Chamber of the Effluent
Storage Tank
Table 3.10 Discharge Limits for Effluent from the
Petrol Interceptors
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 4.7 Results of the Discharge Sample from the
Outlet Chamber of the Effluent
Storage Tank
Table 4.8 Results of the Discharge Sample from the
Petrol Interceptor 1
Table 4.9 Results of the Discharge Sample from the
Petrol Interceptor 2
Table 4.10
Quantities of Waste Generated from the Operation of the
Project
Table 8.1 Exceedances for
Stack Emissions
LIST
OF ANNEXES
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 91st
monthly Environmental Monitoring and Audit (EM&A) report presenting the
EM&A works carried out during the period from 1 to 31 December 2022 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 Month
Works
undertaken in the reporting month 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; and
·
Biogas bypass
trials for preparing the Biogas Holder replacement works.
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 the reporting period. 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.
No non-compliance to the effluent
discharge limit stipulated in the discharge licence issued by the EPD under
the Water Pollution Control Ordinance was recorded during this
reporting period.
Waste
generated from the operation of the Project includes chemical waste, waste
generated from pre-treatment process and general refuse.
No
chemical waste was collected by licenced waste collector from the operation of
the Project.
666.42
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, 0.00 tonne of
metals, 0.00 tonnes of papers/ cardboard packing and 0.00 tonne of plastics
were sent to recyclers for recycling during the reporting period.
Around
3.57 tonnes of general refuse from the operation of the Project was disposed of at landfill. Among the recycled
general refuse from the operation of the Project, 0.001 tonne of metals, 0.04
tonne of papers/ cardboard packing and 0.05 tonne 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 |
1 time |
1 monthly joint environmental site inspection was
carried out by the representatives of the Contractor and the MT. The IEC
was also present at the joint inspections on 21 December 2022. 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 stacks, 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 month include:
·
Operation of the
Project.
·
Biogas Holder
replacement works will be conducted in January 2023.
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 91st
EM&A report which summarises the monitoring results and audit findings for
the EM&A programme during the reporting period from 1 to 31
December 2022.
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 construction phase
EM&A programme was completed in the end of February 2020. The
operation phase of the EM&A programme commenced on 1 March 2019 ([1]).
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
123.41 tonnes and treated an average of 101.91 tonnes of source separated
organic waste per day during the reporting month.
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 de-sulphurisation, the emergency flare, the CHPs,
the ASP and the biological waste water treatment
plant (123.41 t/d SSOW received); ·
Setting adjustments of the CHP 2 engine to fine tune
and return the maximum loading of the engine to 1,500 kW; and ·
Biogas bypass trials for
preparing the Biogas Holder replacement works. |
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 Licence |
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 commissioning and 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 commissioning and 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 commissioning and operation
phase. The last calibration was carried out on
December 2022.
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). The monitoring of NMVOCs
ended in August 2021. (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([3]).
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. 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. 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; 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. The audit shall be conducted to ensure that the effluent quality is in compliance with the discharge licence
requirements. As stipulated in the operation phase discharge licence,
effluent discharge are to be sampled monthly from the
outlet chamber of the Effluent Storage Tank, while effluent discharge are to be
sampled bi-monthly from the Petrol Interceptors. 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 Outlet Chamber of the Effluent
Storage Tank
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 to Section B2 of the
Effluent Discharge Licence under the WPCO. (b)
Parameters required to be monitored and reported by the Contractor in
accordance to Section B2 of the Effluent Discharge
Licence under the WPCO. (c)
Range. |
Table 3.10
Discharge Limits for Effluent from the Petrol Interceptors
Parameters |
Discharge Limit (mg/L) |
Flow Rate (m3/day) |
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 4.8 and Table
4.9. (b)
Parameter not required to be reported in accordance to
Section B2 of the Effluent Discharge Licence under the WPCO. (c)
Parameters required to be reported in accordance to
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. After the one-year maintenance period, the landscape
maintenance and monitoring shall be carried out by the Contractor.
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). The standby flare operated on 2, 8, 13, 14, 15,
16, 19, 21, 23 and 30 December 2022.
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, ASP and the Standby Flaring Gas Unit
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, unstable operation, as well as during 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 – 679.5 |
680 |
Nil |
Nil |
Dust (or TSP) |
0.00 – 0.4 |
6 |
Nil |
Nil |
Odour (including NH3 & H2S) (a) |
0.00 – 40.08 |
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 - 5 |
15 |
Nil |
Nil |
Carbon Monoxide |
0 - 130 |
650 |
Nil |
Nil |
NOx |
0 - 498 |
300 |
Identified (c) |
System unstable (e.g. low
efficiency, unstable column temperature) |
SO2
|
0 – 107 |
50 |
Identified (d) |
De-sulphurisation system tripped / Under Maintenance
|
VOCs (including methane) (b) |
0 – 903 |
1,500 |
Nil |
Nil |
HCl |
0-3 |
10 |
Nil |
Nil |
HF |
0-0 |
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 include methane as biogas is adopted as fuel
in the combustion process. (c)
Dates with exceedances on NOx (number of exceedance
on the day) were identified on 14 (11), 15 (22), 16 (24), 17 (4), 28 (11), 29
(10) and 30 (11) December
2022. (d)
Dates with exceedances on SO2 (number of exceedance
on the day) were identified on 15 (1), 17 (2), 28 (8), 29 (13) and 30 (9) December 2022. |
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 - 3 |
15 |
Nil |
Nil |
Carbon Monoxide |
0 – 139 |
650 |
Nil |
Nil |
NOx |
0 – 493 |
300 |
Identified (c) |
System unstable (e.g. low efficiency,
unstable column temperature) |
SO2 |
0 – 109 |
50 |
Identified (d) |
De-sulphurisation system tripped / Under Maintenance |
VOCs (including methane) (b) |
0 – 827 |
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 include methane as biogas is adopted as fuel
in the combustion process. (c)
Dates with exceedances on NOx (number of exceedance 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. (d)
Dates with exceedances on SO2 (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. (e)
Dates with exceedances on HCl (number of exceedance
on the day) were 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 – 80 |
650 |
Nil |
Nil |
NOx |
0 – 497 |
300 |
Identified (c) |
System unstable (e.g. low efficiency,
unstable column temperature) |
SO2 |
0 – 203 |
50 |
Identified (d) |
De-sulphurisation system tripped / Under Maintenance |
VOCs (including methane) (b) |
0 – 972 |
1,500 |
Nil |
Nil |
HCl |
0 – 5 |
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 include methane as biogas is adopted as fuel
in the combustion process. (c)
Date with exceedances on NOx (number of exceedance
on the day) was 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. (d)
Dates with exceedances on SO2 (number of exceedance
on the day) were 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. |
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 – 0 |
5 |
Nil |
Nil |
Carbon Monoxide |
0 – 70 |
100 |
Nil |
Nil |
NOx |
0 – 468 |
200 |
Identified (c) |
System unstable (e.g. low efficiency, unstable
column temperature ) |
SO2 |
0 – 193 |
50 |
Identified(d) |
De-sulphurization system
tripped / Under Maintenance |
VOCs (including methane) (b) |
0 – 12 |
20 |
Nil |
Nil |
NH3 |
0 – 50 |
35 |
Identified (e) |
System unstable (e.g. low efficiency, unstable column temperature ) |
HCl |
0 – 0 |
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 exceedances on NOx (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. (d)
Dates with exceedances on SO2 (number of exceedances on the
day) were identified on 8 (1), 20 (4), 29 (4) and 31 (2) December 2022.
(e)
Dates with exceedances on NH3 (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. |
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. (d)
All exceedances of the parameters on 2, 8, 13, 14, 15, 16, 19, 21, 23
and 30 December 2022 were caused by the biogas bypass trial conducted during
this reporting period. (e)
Date with exceedances on Carbon Monoxide (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. (f)
Date with exceedances on NOx (number of exceedances on the
day) were identified on 21 (1) 2022. (g)
Date with exceedances on SO2 (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 exceedances on VOCs (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. (i)
Date with exceedances on HCL (number of exceedances on the day) were
identified on 13 (1), 14 (1), 15 (2), 16 (1) and 21 (2) December 2022. (j)
Date with exceedances on HF (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. |
No odour patrol was required to be
conducted for this reporting period.
Effluent discharge was sampled from
the outlet chamber of the Effluent Storage Tank monthly and from the Petrol
Interceptor(s) bi-monthly 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 and the results from
the Petrol Interceptors are recorded in Tables 4.7 – 4.9.
Table 4.7
Results of the Discharge Sample from the Outlet Chamber of the Effluent
Storage Tank
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) |
67.7 (d) |
200 |
Yes |
Total Phosphorus (b) (d) |
15.8 (d) |
50 |
Yes |
Surfactants (total) (b) (d) |
<1.0 (d) |
25 |
Yes |
Notes: (a)
Parameter not required to be reported in accordance to
Section B2 of the Effluent Discharge Licence under the WPCO. (b)
Parameters required to be reported in accordance to
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. |
Table 4.8
Results of the Discharge Sample from the Petrol Interceptor 1
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)
Sample collected on 8 December 2022. (b)
Parameter not required to be reported in accordance to
Section B2 of the Effluent Discharge Licence under the WPCO. (c)
Parameters required to be reported in accordance to
Section B2 of the Effluent Discharge Licence under the WPCO. |
Table 4.9
Results of the Discharge Sample from the Petrol Interceptor 2
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)
Sample collected on 8 December 2022. (b)
Parameter not required to be reported in accordance to
Section B2 of the Effluent Discharge Licence under the WPCO. (c)
Parameters required to be reported in accordance to
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 ([4]).
Reference has been made to the Monthly Summary Waste Flow Table 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 month are summarised in Table 4.10.
Table 4.10
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) |
Recycled (c)
|
December 2022 |
0 L (d) |
666.42 tonnes |
0 tonnes |
3.57 tonnes (e) |
0.091 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, 0.00 tonne of
metals, 0.00 tonnes of papers/ cardboard packing and 0.00 tonne of plastics
were sent to recyclers for recycling during the reporting period. (c)
Among general refuse, 0.001 tonnes of metals, 0.04 tonnes of papers/
cardboard packing and 0.05 tonnes of plastics were sent to recyclers for
recycling during the reporting period. (d)
No chemical waste was disposed of at CWTC in December 2022. (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 inspection for the operation phase of the Project on 21 December 2022
covered the operation phase environmental site audit. Joint site
inspection was conducted by representatives of the Contractor, IEC, and the MT
on 21 December 2022 as required for the operation of the Project.
The
audits 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).
Key observations during the
reporting period are summarised as follows:
21
December 2022
·
No particular observation during this
inspection.
Other than the above observations,
the Contractor has implemented environmental mitigation measures recommended in
the approved EIA Report and EM&A Manual.
Inspection
of the landscape and visual mitigation measures for the operation phase of the
Project was performed on 21 December
2022.
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 specific observation was found during the joint site
inspection on 21 December 2022. 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.
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 de-sulphurisation system, CHPs and the ASP, the
potential causes for the exceedance were identified.
The investigation reports of the
above exceedance are presented in Annex F.
Activities to be undertaken for the
coming reporting period are:
·
Operation of the Project; and
·
Biogas Holder replacement works.
This EM&A Report presents the
EM&A programme undertaken during the reporting period from 1 to 31
December 2022 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 the CHPs and the ASP stack monitoring
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 |
Cogeneration
Unit 1 (CHP 1) |
·
Exceeded emission limit of NOx on 14, 15, 16, 17, 28, 29
and 30 December 2022. ·
Exceeded emission limit of SO2 on 15, 17, 28, 29 and 30
December 2022. |
Cogeneration
Unit 2 (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. ·
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. ·
Exceeded emission limit of HCl on 19 December 2022. |
Cogeneration
Unit 3 (CHP 3) |
·
Exceeded emission limit of NOx on 20, 21, 22, 23, 24, 25,
26, 28, 29 and 30 December 2022. ·
Exceeded emission limit of SO2 on 20, 21, 22, 23, 24, 25,
26, 28, 29 and 30 December 2022. |
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. ·
Exceeded emission limit of SO2 on 8, 20, 29 and 31 December
2022. ·
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. |
Standby
Flaring Gas Unit |
·
Exceeded emission limit of Carbon Monoxide on 8, 13, 14, 15, 16, 19
and 21 December 2022. ·
Exceeded emission limit of NOx on 21 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. ·
Exceeded emission limit of HCL on 13, 14, 15, 16 and 21 December 2022. ·
Exceeded emission limit of HF on 2, 8, 13, 14, 15, 16, 19, 21 and 30
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 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.
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.
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.
([2])
A standby facility. Only operate when the CHPs
are not in operation or when the biogas generated exceeded the utilisation rate
of the CHPs.