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 Commissioning Phase
Monitoring
4.1.2 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
2.1Summary of Activities Undertaken in the Reporting Period
Table 2.2Summary of
Environmental Licensing, Notification and Permit Status
Table 3.1Sampling and
Laboratory Analysis Methodology
Table 3.2Emission Limit for
CAPCS Stack
Table 3.3Emission Limit for
CHP Stack
Table 3.4Emission Limit for
ASP Stack
Table 3.5Emission Limit for
Standby Flaring Gas Unit ()
Table 3.6Odour Intensity
Level
Table 3.7Action and Limit
Levels for Odour Nuisance
Table 3.8Event and Action
Plan for Odour Monitoring
Table 3.9Discharge Limits for
Effluent from the Effluent
Storage Tank
Table 3.10Discharge Limits
for Effluent from the Petrol Interceptors
Table 4.1Hourly Average of
Parameters Recorded for CAPCS
Table 4.2Hourly Average of
Parameters Recorded for CHP 1
Table 4.3Hourly Average of
Parameters Recorded for CHP 2
Table 4.4Hourly Average of
Parameters Recorded for CHP 3
Table 4.5Hourly Average of
Parameters Recorded for ASP
Table 4.6Results of the
Discharge Sample from the Effluent
Storage Tank
Table 4.7Results of the
Discharge Sample from the Petrol Interceptor 1
Table 4.8Results of the
Discharge Sample from the Petrol Interceptor 2
Table 4.9Quantities of Waste
Generated from the Operation of the Project
Table 8.1Exceedances for Stack
Emissions
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 82nd monthly Environmental Monitoring and Audit
(EM&A) report presenting the EM&A works carried out during the period
from 1 to 31 March 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; and
·
Fine
tuning of the CHPs and modification of the ASP to control the air emission.
Environmental Monitoring and Audit
Progress
Air Quality Monitoring
Non-compliance of emission limits of SO2 from
CHP 1 and CO, NOx, VOCs and NH3 from ASP were recorded
during the reporting period. 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.
The exceedances of SO2 from CHP 1 occurred due
to malfunctioning of an instrument (blower) of the de-sulphurisation system.
The exceedance of CO,
NOx, VOCs and NH3 from ASP occurred due to system
instability caused by leakage of the internal tubing of the economiser.
Water Quality
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 Management
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.
253.75 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,
0.00 tonnes of papers/ cardboard packing
and 0.00 tonne of plastics were sent to
recyclers for recycling during the reporting period.
Around 2.65 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, 0.00 tonne of metals, 0.00 tonne of papers/ cardboard packing
and 0.00 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 11 March 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 and ASP stacks were recorded during the
reporting period.
No complaint/
summon/prosecution was received in this reporting period.
Future Key Issues
Activities to be undertaken in the next reporting month
include:
·
Operation
of the Project.
·
Fine
tuning of the CHPs and modification of the ASP to control the air emission.
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.
This is the 82nd EM&A report which summarises
the monitoring results and audit findings for the EM&A programme during the
reporting period from 1 to 31 March 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
2
Project
information
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 ().
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 115.12
tonnes and treated an average of 106.93 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 (115.12 t/d SSOW received);
and
·
Fine tuning of the CHPs and modification of
the ASP to control the air emission.
|
2.4
Project Organisation
and Management Structure
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
|
-
|
3
Environmental
Monitoring and Audit Requirements
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 15 June 2021 ().
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 ([3])
|
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.
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 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 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 4.7 and Table 4.8.
(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.
4
Monitoring
Results
Monitoring results of air quality parameters from stack
emissions of the centralised air pollution control system, the ammonia
stripping plant and the cogeneration units will be provided once available to
show compliance with the monitoring requirements stated in the EM&A Manual
(Rev. F) to support the termination of the commissioning phase EM&A
programme.
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, there is no need to operate the standby flare and therefore
no monitoring of the flare stack was undertaken.
With reference to the emission limits shown in Tables
3.2, 3.3 and 3.4, the hourly average concentrations and the number
of exceedances of the concerned air emissions monitored for the CAPCS, CHP and
ASP during this reporting period are presented in Tables 4.1 to 4.5.
It should be noted that measurements recorded under
abnormal operating conditions, e.g. start up and stopping of stacks, 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 – 212.88
|
680
|
Nil
|
Nil
|
|
Dust
(or TSP)
|
0.00 – 0.00
|
6
|
Nil
|
Nil
|
|
Odour (including NH3 & H2S) (a)
|
0.00 – 180.17
|
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 - 3
|
15
|
Nil
|
Nil
|
|
Carbon Monoxide
|
0 - 639
|
650
|
Nil
|
Nil
|
|
NOx
|
0 - 300
|
300
|
Nil
|
Nil
|
|
SO2
|
0 - 61
|
50
|
Identified
(c)
|
De-sulphurisation
system tripped / Under Maintenance
|
|
VOCs (including
methane) (b)
|
0 – 1,017
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0 - 3
|
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 SO2 (number of exceedance on the day) were
identified on 25 (1) March 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
- 12
|
15
|
Nil
|
Nil
|
|
Carbon
Monoxide
|
0
– 629
|
650
|
Nil
|
Nil
|
|
NOx
|
0
– 295
|
300
|
Nil
|
Nil
|
|
SO2
|
0
– 49
|
50
|
Nil
|
Nil
|
|
VOCs (including methane) (b)
|
0
– 774
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0
– 1
|
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.
|
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
– 605
|
650
|
Nil
|
Nil
|
|
NOx
|
0
– 300
|
300
|
Nil
|
Nil
|
|
SO2
|
0
– 49
|
50
|
Nil
|
Nil
|
|
VOCs (including methane) (b)
|
0
– 1,149
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0
– 3
|
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.
|
Table 4.5 Hourly Average of Parameters
Recorded for ASP
|
Parameter
|
Range of Hourly
Average Conc. (mg/Nm3) (a)
|
Max.
Emission Limit (mg/Nm3)
|
Exceedances
Identified
|
Remarks
|
|
Dust (or TSP)
|
0
– 5
|
5
|
Nil
|
Nil
|
|
Carbon Monoxide
|
0
– 471
|
100
|
Identified
(c)
|
System
unstable (e.g. low efficiency, unstable column temperature)
|
|
NOx
|
0
– 458
|
200
|
Identified
(d)
|
System
unstable (e.g. low efficiency, unstable column temperature )
|
|
SO2
|
0
– 145
|
50
|
Nil
|
Nil
|
|
VOCs (including
methane) (b)
|
0
– 1,486
|
20
|
Identified
(e)
|
System
unstable (e.g. low efficiency, unstable column temperature )
|
|
NH3
|
0 – 156
|
35
|
Identified
(f)
|
System unstable
(e.g. low efficiency, unstable column temperature )
|
|
HCl
|
0 – 4
|
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 CO
(number of exceedances on the day) were identified on 8 (1), 13 (1) and 27
(1) March 2022.
(d) Dates with exceedances on
NOx (number of exceedances on the day) were identified on 1 (1), 3 (1), 4
(1), 6 (2), 7 (2), 8 (8), 13 (1), 14 (6), 15 (3), 16 (6), 17 (3), 24 (4), 25
(7), 27 (1), 28 (1) and 31 (4) March 2022.
(e) Date with exceedances on
VOCs (number of exceedances on the day) was identified on 13 (1) March 2022.
(f) Dates with exceedances on
NH3 (number of exceedances on the day) were identified on 2 (3), 3
(5), 4 (1), 6 (1), 8 (2), 12 (2), 13 (7), 14 (2), 16 (4), 17 (5), 24 (1), 25
(4), 26 (7), 27 (2), 28 (1), 30 (2) and 31 (4) March 2022.
|
4.2
Odour
No odour patrol was required to be conducted for this
reporting period.
Effluent discharge was sampled from 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 Effluent Storage Tank are recorded in Table 4.6 and the results from
the Petrol Interceptors are recorded in Table 4.7 and Table 4.8.
Table 4.6 Results of the Discharge Sample from the Effluent Storage Tank
|
Parameters
|
Discharged
Effluent Concentration (mg/L)
|
Discharge
Limit (mg/L)
|
Compliance
with Discharge Limit
|
|
Flow
Rate (m3/day) (a)
|
0
– 281 (e)
|
645
|
Yes
|
|
pH
(pH units) (b)
|
7.60
– 8.27 (e)
|
6-10
(c)
|
Yes
|
|
Suspended
Solids (b) (d)
|
76
(d)
|
800
|
Yes
|
|
Biochemical
Oxygen Demand (5 days, 20°) (b) (d)
|
34
(d)
|
800
|
Yes
|
|
Chemical
Oxygen Demand (b) (d)
|
760
(d)
|
2,000
|
Yes
|
|
Oil
& Grease (b) (d)
|
<5
(d)
|
40
|
Yes
|
|
Total
Nitrogen (b) (d)
|
77.3
(d)
|
200
|
Yes
|
|
Total
Phosphorus (b) (d)
|
20.2
(d)
|
50
|
Yes
|
|
Surfactants
(total) (b) (d)
|
5.5
(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 30 March 2022.
(e) Data collected daily.
|
Table
4.7 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)
|
-
(a)
|
30
|
Yes
|
|
Chemical
Oxygen Demand (c)
|
-
(a)
|
80
|
Yes
|
|
Oil
& Grease (c)
|
-
(a)
|
20
|
Yes
|
|
Surfactants
(total) (b)
|
-
(a)
|
15
|
Yes
|
|
Notes:
(a) No sampling was required in
March 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 4.8 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)
|
-
(a)
|
30
|
Yes
|
|
Chemical
Oxygen Demand (c)
|
-
(a)
|
80
|
Yes
|
|
Oil
& Grease (c)
|
-
(a)
|
20
|
Yes
|
|
Surfactants
(total) (b)
|
-
(a)
|
15
|
Yes
|
|
Notes:
(a) No sampling was carried out
in March 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.
|
4.4
Waste Management
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 4.9.
Table 4.9 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)
|
|
March 2022
|
0 L (d)
|
253.75 tonnes
|
0 tonnes
|
2.65 tonnes (e)
|
0.00 tonne
|
|
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, 0.00
kg of metals, 0.00 kg of papers/
cardboard packing and
0.00 kg of plastics were
sent to recyclers for recycling during the reporting period.
(d) No chemical waste was
generated in March 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.
|
5
Site Audit
5.1
Environmental Site
Audit
The monthly
inspection for the operation phase of the Project on 11 March 2022 covered the
operation phase environmental site audit. Joint site inspection was conducted
by representatives of the Contractor, IEC, and the MT on 11 March 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:
11 March
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 11 March 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 11 March 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.
6
Environmental
Non-conformance and Deficiencies
Non-compliance of emission limits of SO2 from
CHP 1 and CO, NOx, VOCs and NH3 from ASP 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
and the ASP,
the potential causes for the exceedance were identified.
The exceedances of SO2 from CHP 1 occurred due
to malfunctioning of the control instrument. A blower within the
de-sulphurisation system was tripped and immediate maintenance work was carried
out by on-site maintenance team and the issue was fixed on the same day.
The exceedance of CO, NOx, VOCs and NH3 from ASP
occurred due to system instability caused by leakage of the internal tubing of the
economiser. The Contractor arranged urgent maintenance to the structure. The ASP
has been under continuous upgrading work throughout the reporting month.
The investigation reports of the above exceedance are
presented in Annex F.
No complaint was received during the
reporting period.
No summon/prosecution was received
during the reporting period. The cumulative summons/prosecution log is shown
in Annex E.
7
Future
Key Issues
Activities to be undertaken for the coming reporting period
are:
·
Operation
of the Project.
·
Fine
tuning of the CHPs and modification of the ASP to control the air emission.
8
Conclusions
This EM&A Report presents the EM&A programme undertaken
during the reporting period from 1 to 31 March 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 ASP stack monitoring was 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 SO2
on 25 March 2022
|
|
Ammonia
Stripping Plant (ASP)
|
· Exceeded emission limit of CO
on 8, 13 and 27 March 2022.
· Exceeded emission limit of
NOx on 1, 3, 4, 6, 7, 8, 13, 14, 15, 16, 17, 24, 25, 27, 28 and 31 March
2022.
· Exceeded emission limit of
VOCs on 13 March 2022.
· Exceeded emission limit of
NH3 on 2, 3, 4, 6, 8, 12, 13, 14, 16, 17, 24, 25, 26, 27, 28, 30
and 31 March 2022.
|
Non-compliance of emission limits of SO2 from CHP 1 and
CO, NOx, VOCs and NH3 from ASP were recorded during the
reporting period.
The exceedances
of SO2 from CHP 1 occurred due to malfunctioning of an instrument
(blower) of the de-sulphurisation system. The exceedance of CO, NOx,
SO2, VOCs and NH3 from ASP occurred due to system
instability caused by the leakage of the internal tubing of the economiser of
the ASP.
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.
