1
Introduction
1.1
Purpose of the Report
1.2
Structure of the Report
2
Project information
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
Monitoring Results
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
Site Audit
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
Future Key Issues
7.1
Key Issues for the Coming Month
8
Conclusions
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
Table 8.2
Exceedances for Petrol Interceptor 1
and 2
EXECUTIVE
SUMMARY
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 93rd monthly Environmental Monitoring and Audit (EM&A)
report presenting the EM&A works carried out during the period from 1 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 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;
·
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
NOx and SO2 from the CHPs, HCl from CHP 1 and NOx, SO2
and NH3 from ASP 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 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.
Water Quality
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 the
discharge water containing higher concentrations for the exceeded parameters.
Waste Management
Waste generated from the operation
of the Project includes chemical waste, waste generated from pre-treatment
process and general refuse.
5,540 L ofchemical waste
was collected by licenced waste collector from the operation of the Project.
643.75 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, 0.36 tonnes of papers/
cardboard packing and 0.00 tonne of plastics were sent to recyclers for
recycling during the reporting period.
Around 2.76 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, 0.003 tonne of metals, 0.00 tonne of papers/ cardboard packing and
0.015 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 28 February 2023. The environmental control/
mitigation measures (related to air quality, water quality, waste (including
land contamination prevention), hazard-to-life and landscape and visual)
recommended in the approved EIA Report and the EM&A Manual were properly
implemented by the Contractor during the reporting month.
Environmental Exceedance/Non-conformance/Compliant/Summons and
Prosecution
Exceedances for the air emission limits for the
CHP and ASP stacks and discharge limits for the Petrol Interceptor 1 and 2 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; and
·
SBR Cleaning and Diffuser Replacement works.
1
Introduction
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.
1.1
Purpose of the Report
This is the 93rd EM&A report which summarises the
monitoring results and audit findings for the EM&A programme during the
reporting period from 1 to 28 February 2023.
1.2
Structure of the Report
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
2
Project information
2.1
Background
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 ().
2.2
General Site Description
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 135.14 tonnes and treated an average of 112.14 tonnes of
source separated organic waste per day during the reporting month.
2.3
Major Activities Undertaken
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 (135.14 t/d SSOW received);
·
Fine tuning of the CHPs temperature curves and PM; and
·
Repair of VOC sensor for CAPCS.
|
2.4
Project
Organisation and Management Structure
The project organisation chart and contact details are shown in Annex B.
2.5
Status of Environmental Approval Documents
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
|
-
|
3
Environmental Monitoring and
Audit Requirements
3.1
Environmental Monitoring
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.
3.1.1
Air Quality
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 5 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). 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.
|
3.1.2
Odour
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.
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.
|
3.2
Site Audit
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.
3.2.1
Water
Quality
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.
|
3.2.2
Landscape
and Visual
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.
4
Monitoring Results
4.1
Air Quality
4.1.1
Operation
Phase Monitoring
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
did not operate during the reporting period.
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, unstable operation, 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 – 363.45
|
680
|
Nil
|
Nil
|
|
Dust (or TSP)
|
0.01 – 0.14
|
6
|
Nil
|
Nil
|
|
Odour (including NH3
& H2S) (a)
|
0.00 – 107.9
|
220
|
Nil
|
Nil
|
|
Note:
(a) The odour unit is OU/Nm3.
|
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
- 6
|
15
|
Nil
|
Nil
|
|
Carbon
Monoxide
|
0
- 135
|
650
|
Nil
|
Nil
|
|
NOx
|
0
- 546
|
300
|
Identified
(c)
|
System
unstable (e.g. low efficiency, unstable column temperature)
|
|
SO2
|
0
- 171
|
50
|
Identified
(d)
|
De-sulphurisation
system tripped / Under Maintenance
|
|
VOCs (including methane) (b)
|
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 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 (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
exceedances on SO2 (number of exceedance on the day) were
identified on 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 exceedances on HCl (number of exceedance on the
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 - 1
|
15
|
Nil
|
Nil
|
|
Carbon Monoxide
|
0 – 405
|
650
|
Nil
|
Nil
|
|
NOx
|
0 – 513
|
300
|
Identified (c)
|
System unstable (e.g.
low efficiency, unstable column temperature)
|
|
SO2
|
0 – 100
|
50
|
Identified (d)
|
De-sulphurisation
system tripped / Under Maintenance
|
|
VOCs
(including methane) (b)
|
0 – 989
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0 – 8
|
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) Dates with exceedances on NOx
(number of exceedance on the day) were identified on 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 exceedances on SO2
(number of exceedance on the day) were identified on 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.
|
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 – 6
|
15
|
Nil
|
Nil
|
|
Carbon Monoxide
|
0 – 60
|
650
|
Nil
|
Nil
|
|
NOx
|
0 – 592
|
300
|
Identified(c)
|
System unstable (e.g.
low efficiency, unstable column temperature)
|
|
SO2
|
0 – 76
|
50
|
Identified(d)
|
De-sulphurisation
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 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
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 exceedances on SO2
(number of exceedance on the day) were identified on
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
– 0
|
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
– 98
|
50
|
Identified(d)
|
De-sulphurization system tripped / Under Maintenance
|
|
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 exceedances on NOx
(number of exceedances on the day) were identified on 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 exceedances on SO2
(number of exceedances on the day) were identified on 1 (10), 10 (1), 12 (1),
25 (1) and 26 (1) February 2023.
(e) Dates with exceedances on NH3
(number of exceedances on the day) were identified on 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
|
|
Dust (or TSP)
|
N/A
|
5
|
N/A
|
N/A
|
|
Carbon Monoxide
|
N/A
|
100
|
N/A
|
N/A
|
|
NOx
|
N/A
|
200
|
N/A
|
N/A
|
|
SO2
|
N/A
|
50
|
N/A
|
N/A
|
|
VOCs
(including methane) (b)
|
N/A
|
20
|
N/A
|
N/A
|
|
HCl
|
N/A
|
10
|
N/A
|
N/A
|
|
HF
|
N/A
|
1
|
N/A
|
N/A
|
|
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) The standby flare did not operate
during this reporting period.
|
4.2.1
Operation
Phase Monitoring
No odour patrol was required to be conducted for this reporting period.
4.3
Water Quality
4.3.1
Operation
Phase Monitoring
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)
|
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)
|
75.3
(d)
|
200
|
Yes
|
|
Total
Phosphorus (b) (d)
|
10.9
(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 28 February
2023.
(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)
|
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) Sample collected on 23 February 2023.
(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)
|
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) Sample collected on 23 February 2023.
(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.
|
4.4
Waste Management
4.4.1
Operation
Phase Monitoring
Wastes generated from the operation of the Project include chemical
waste, wastes generated from pre-treatment process and general refuse ().
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
Pre-treatment Process
|
General Refuse
|
|
|
Disposal of at CWTC
|
Disposed of at Landfill (a)
|
Recycled (b)
|
Disposed of at Landfill (a)
|
Recycled (c)
|
|
February 2023
|
5,540 L (d)
|
643.75 tonnes
|
0.36 tonnes
|
2.76 tonnes (e)
|
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, 0.00 tonne of metals, 0.36 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, 0.003 tonnes of metals, 0.00 tonnes of papers/ cardboard
packing and 0.015 tonnes of plastics were sent to recyclers for recycling
during the reporting period.
(d)
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.
|
5
Site Audit
5.1
Environmental
Site Audit
5.1.1
Operation
Phase
The monthly inspection for the
operation phase of the Project on 28 February 2023 covered the operation phase
environmental site audit. Joint site inspection was conducted by
representatives of the Contractor, IEC, and the MT on 28 February 2023 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:
28 February 2023
·
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.
5.2
Landscape and Visual Audit
Inspection of the landscape and
visual mitigation measures for the operation phase of the Project was performed on 28 February 2023.
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 28 February 2023. 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.
6
Environmental Non-conformance
and Deficiencies
6.1
Summary of Environmental
Non-Compliance and Deficiencies
Non-compliance of emission limits of SO2 and NOx 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 cause of exceedances may
due to the reason of dry season.
The investigation reports of the above exceedance are presented in Annex F.
6.2
Summary of Environmental
Complaint
No complaint was received during the
reporting period.
6.3
Summary of Environmental
Summon and Successful Prosecution
No summon/prosecution was received
during the reporting period. The cumulative summons/prosecution log is
shown in Annex E.
7
Future Key Issues
7.1
Key Issues for the Coming
Month
Activities to be undertaken for the coming reporting period are:
·
Operation of the
Project; and
·
SBR Cleaning and
Diffuser Replacement works.
8
Conclusions
This EM&A Report presents the EM&A programme undertaken during
the reporting period from 1 to 28 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 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 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 1, 2, 3, 9, 10, 11, 12, 13, 14, 15, 16, 21, 22,
23, 24, 25, 26, 27 and 28 February 2023.
·
Exceeded emission
limit of HCl on 13 February 2023.
|
|
Cogeneration Unit 2 (CHP 2)
|
·
Exceeded emission
limit of NOx on 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 3, 4, 5, 6, 7, 8, 9, 10, 11, 16, 17, 18, 20, 21,
23 and 24 February 2023.
|
|
Cogeneration Unit 3 (CHP 3)
|
·
Exceeded emission
limit of NOx on 12, 13, 14, 15, 16, 17, 22, 24, 25, 27 and 28
February 2023.
·
Exceeded emission
limit of SO2 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 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 1, 10, 12, 25 and 26 February 2023.
·
Exceeded emission
limit of NH3 on 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.
|
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 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 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.
|
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 the
reporting period.
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 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.