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
6.1 Summary of Environmental Non-Compliance
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 Reporting Period
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
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 Results of the
Discharge Sample Collected on 2 march 2020
Table 4.7 Results of the
Discharge Sample Collected on 8 April 2020
Table 4.8 Results of the
Discharge Sample Collected on 6 May 2020
Table 4.10 Quantities of
Waste Generated from the Operation of the Project
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 22nd
quarterly Environmental Monitoring and Audit (EM&A) report presenting the
EM&A works carried out during the period from 1 September 2020 to 30
November 2020 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
·
Process fine-tune,
including adjustment of the ASP with new treatment media, modification of
Continuous Environmental Monitoring System (CEMS) and Supervisory Control and
Data Acquisition System (SCADA) rectification and improvement works following
equipment failures and the alteration of different operation modes and measures
to adapt to the high variation of SSOW nature and sources.
Environmental Monitoring and Audit Progress
Air Quality Monitoring
Exceedances on NOx and SO2 from CHP and NOx
and NH3 from ASP were recorded on the on-line monitoring system in
September 2020. Exceedances on Odour (NH3 & H2S)
from CAPCS, NOx from CHP and CO, NOx, VOC (including
methane) and NH3 from ASP were recorded on the on-line monitoring
system in October 2020. Exceedances on Odour (NH3 & H2S),
NOx from CHP and CO, NOx, VOC (including methane) and NH3
from ASP were recorded on the on-line monitoring system in November 2020. 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.
Exceedances in emission parameters of CAPCS, CHP and ASP were found to be
a result of problems with system maintenance at CAPCS, low biogas loading at
CHP and incomplete combustion of biogas at ASP.
The Contractor has implemented mitigation measures to control the
exceedance (including continuous monitoring of CAPCS, arranging for the
supplier of CHP to perform on-site adjustment to improve CHP performance and
tuning the thermal combustion unit of the ASP to optimise combustion efficiency
and overall performance).
The Contractor is recommended to closely monitor the processes of the
modification of the ASP and the post-modification monitoring of emission level
to avoid any exceedance.
Odour
Odour patrols were conducted by the independent odour patrol team of ALS
Technichem (HK) Pty Ltd on 4 September 2020. No Level 2 Odour Intensity was
recorded during odour patrols.
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.
400 L of chemical waste was collected by licenced waste collector from
the operation of the Project.
2,108.59 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 tonnes of metals, 8.99 tonnes of papers/ cardboard packing and 0.00 tonnes
of plastics were sent to recyclers for recycling during the reporting period.
Around 8.64 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 tonnes of metals, 0.00 tonnes of papers/
cardboard packing and 0.00 tonnes of plastics were sent to recyclers for
recycling during the reporting period.
Findings of Environmental Site Audit
A summary of the monitoring activities
undertaken in this reporting period is listed below:
|
·
Joint Environmental
Site Inspections
|
3 times
|
|
·
Landscape &
Visual Inspections
|
3 times
|
Monthly joint environmental site
inspections were carried out. The environmental control/ mitigation measures
(related to air quality, water quality, waste (including land contamination
prevention), hazard-to-life and landscape and visual) recommended in the
approved EIA Report and the EM&A Manual were properly implemented by the
Contractor during the reporting month.
Environmental
Exceedance/Non-conformance/Compliant/Summons and Prosecution
Exceedances for the air emission limits for the CAPCS,
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.
·
Modification of the CHP
and 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 22nd Quarterly EM&A report
which summarises the monitoring results and audit findings for the EM&A programme
during the reporting period from 1 September 2020 to 30 November 2020.
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 operation phase of the EM&A programme
commenced on 1 March 2019 (). The
construction phase EM&A programme was completed in the end of February
2020.
The Project Site is located at Siu Ho Wan in North
Lantau with an area of about 2 hectares. The layout of the Project Site is illustrated in Annex A. The facility received and treated an average of 100
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 desulphurisation, the emergency
flare, the CHPs, the ASP and the biological waste water treatment plant
(about 100-130 t/d SSOW input); and
·
Process fine-tune – adjustment
of the ASP operational parameters with new treatment media, CEMS/SCADA
modification and improvement work following equipment failures and the
alteration of different operation modes and measures to adapt to the high
variation of SSOW nature and sources.
|
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
|
|
Notification of Construction Works under the Air
Pollution Control (Construction Dust) Regulation
|
Ref No. 386715
|
Throughout the Contract
|
-
|
|
Effluent Discharge License
|
WT00024352-2016
|
3 June 2016 – 30 June 2021
|
Approved on 3 June 2016
|
|
Construction Noise Permit – P1&P2
|
GW-RW0538-18
(Superseded CNP GW-RW0229-18)
|
21 January 2019-20 July 2019
|
Approved on 31 December 2018
|
|
Chemical Waste Producer Registration
|
WPN 5213-961-O2231-01
|
Throughout the Contract
|
Approved on 29 April 2015
|
|
Chemical Waste Producer
Registration
|
WPN 5213-961-O2231-02
|
Throughout the implementation
of the Project
|
Approved on 10 November 2017
|
|
Waste Disposal Billing Account
|
Account number: 702310
|
Throughout the Contract
|
-
|
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.
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 calibration certificate for
the on-line monitoring equipment is provided in Annex C.
The monitoring data is transmitted instantaneously to
EPD (Regional Office) by telemetry system.
When the on-line monitoring for certain parameter
cannot be undertaken, monitoring will be carried out using the following
methodology approved by the EPD.
Table 3.1 Sampling and Laboratory Analysis Methodology
|
Parameters
|
Method
|
Stacks
to be Monitored
|
|
Gaseous and
vaporous organic substances (including methane)
|
USEPA Method
18
|
·
CAPCS
·
CHP
·
ASP
|
|
Particulate
|
USEPA Method
5
|
·
CAPCS
·
CHP
·
ASP
|
|
Carbon
monoxide (CO)
|
USEPA Method 10
|
·
CHP
·
ASP
|
|
Nitrogen
oxides (NOx)
|
USEPA Method
7E
|
·
CHP
·
ASP
|
|
Sulphur
dioxide (SO2);
|
USEPA Method
6
|
·
CHP
·
ASP
|
|
Hydrogen
chloride (HCl)
|
USEPA Method
26A
|
·
CHP
·
ASP
|
|
Hydrogen
fluoride (HF)
|
USEPA Method
26A
|
·
CHP
·
ASP
|
|
Oxygen (O2);
|
USEPA Method
3A
|
·
CAPCS
·
CHP
·
ASP
|
|
Velocity and
Volumetric Flow
|
USEPA Method
2
|
·
CAPCS
·
CHP
·
ASP
|
|
Ammonia (NH3)
|
USEPA CTM 027
|
·
ASP
|
|
Odour
(including NH3 and H2S)
|
EN 13725
|
·
CAPCS
|
|
Water vapour
content (continuous measurement of the water vapour content should not be required
if the sample exhaust gas is dried before the emissions are analysed)
|
USEPA Method 4
|
·
CAPCS
·
CHP
·
ASP
|
|
Temperature
|
USEPA Method 4
|
·
CAPCS
·
CHP
·
ASP
|
With reference to the EM&A Manual, the air
emission of the stacks shall meet the following emission limits as presented in
Tables 3.2 to 3.5.
Table 3.2 Emission Limit for CAPCS Stack
|
Parameter
|
Emission
Level (mg/Nm3) (a)
|
|
VOCs
(including methane)
|
680
|
|
Dust (or Total Suspended
Particulates (TSP))
|
6
|
|
Odour (including NH3 & H2S)
|
220 (b)
|
|
Notes:
(a)
Hourly
average concentration
(b) The odour unit is OU/Nm3
|
Table 3.3 Emission Limit for CHP Stack
|
Parameter
|
Maximum
Emission Level (mg/Nm3) (a) (b)
|
|
Dust (or
Total Suspended Particulates)
|
15
|
|
Carbon
Monoxide
|
650
|
|
NOx
|
300
|
|
SO2
|
50
|
|
NMVOCs (c)
|
150
|
|
VOCs (including methane) (d)
|
1,500
|
|
HCl
|
10
|
|
HF
|
1
|
|
Notes:
(a) All values refer to an oxygen content in the exhaust
gas of 6% and dry basis.
(b) Hourly average concentration
(c) NMVOCs should be monitored by gas sampling and
laboratory analysis at an agreed interval. For the first 12 months (starting
from August 2019), monitoring should be carried out at quarterly intervals.
The monitoring frequency should then be reduced to half-yearly for next 12
months (starting from August 2020).
(d) The VOCs emission limit include methane as biogas is
adopted as fuel in the combustion process.
|
Table 3.4 Emission Limit for ASP Stack
|
Parameter
|
Maximum Emission Level (mg/Nm3) (a) (b)
|
|
Dust (or Total Suspended
Particulates)
|
5
|
|
Carbon Monoxide
|
100
|
|
NOx
|
200
|
|
SO2
|
50
|
|
VOCs (including methane) (c)
|
20
|
|
NH3
|
35
|
|
HCl
|
10
|
|
HF
|
1
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 11% and dry basis.
(b) Hourly average
concentration
(c) The VOCs emission limit
include methane as biogas is adopted as fuel in the combustion process.
|
Table 3.5 Emission Limit for Standby Flaring Gas Unit ([2])
|
Parameter
|
Maximum
Emission level (mg/Nm3) (a) (b)
|
|
Dust (or
Total Suspended Particulates)
|
5
|
|
Carbon
Monoxide
|
100
|
|
NOx
|
200
|
|
SO2
|
50
|
|
VOCs
(including methane) (c)
|
20
|
|
HCl
|
10
|
|
HF
|
1
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 11% and dry basis.
(b) Hourly average concentration
(c) The VOCs emission limit
include methane as biogas is adopted as fuel in the combustion process.
|
To determine the effectiveness
of the proposed odour mitigation measures and to ensure that the operation of
the ORRC1 will not cause adverse odour impacts, odour monitoring of the CAPCS
stack (see Section 3.1.1) and odour patrol will be carried out.
Odour patrol shall be conducted by independent trained
personnel/ competent persons in summer months (i.e. from July to September) for
the first two operational years of ORRC1 at monthly intervals along an odour
patrol route at the Project Site boundary as shown in Annex A.
The perceived odour intensity is divided into 5
levels. Table 3.6 describes the odour intensity for different levels.
Table 3.6 Odour Intensity Level
|
Level
|
Odour Intensity
|
|
0
|
Not detected. No odour perceived or an odour so weak that it
cannot be easily characterised
or described
|
|
1
|
Slight identifiable
odour, and slight
chance to have odour
nuisance
|
|
2
|
Moderate identifiable odour,
and moderate chance to have odour
nuisance
|
|
3
|
Strong identifiable,
likely to have odour nuisance
|
|
4
|
Extreme severe odour,
and unacceptable odour level
|
Table 3.7 shows the action level and limit level to be used for
odour patrol. Should any exceedance of the action and limit levels occurs,
actions in accordance with the event and action plan in Table 3.8 should
be carried out.
Table 3.7 Action and Limit Levels for Odour Nuisance
|
Parameter
|
Action
Level
|
Limit
Level
|
|
Odour
Nuisance (from odour patrol)
|
When one
documented compliant is received (a), or Odour Intensity of
2 is measured from odour patrol.
|
Two or
more documented complaints
are received (a) within a week; or
Odour intensity of 3 or above is measured
from odour patrol.
|
|
Note:
(a)
Once
the complaint is received by the Project Proponent (EPD), the Project
Proponent would investigate and verify the complaint whether it is related to
the potential odour emission from the ORRC1 and its on-site wastewater
treatment unit.
|
Table 3.8 Event and Action Plan for Odour Monitoring
|
Event
|
Action
|
|
|
Person-in-charge of
Odour Monitoring
|
Project Proponent (a)
|
|
Action
Level
|
|
|
|
Exceedance
of action level (Odour Patrol)
|
1. Identify
source/reason of exceedance;
2. Repeat
odour patrol to confirm finding.
|
1. Carry
out investigation to identify the source/reason of exceedance. Investigation
should be completed within 2 weeks;
2. Rectify
any unacceptable practice;
3.
Implement more mitigation measures if necessary;
4. Inform
Drainage Services Department (DSD) or the operator of the Siu Ho Wan Sewage
Treatment Works (SHWSTW) if exceedance is considered to be caused by the
operation of the SHWSTW.
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
D. 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. The effluent quality shall meet the discharge limits as
described in Table 3.9.
Table 3.9 Discharge Limits for Effluent
|
Parameters
|
Discharge
Limit (mg/L)
|
|
Flow Rate (m3/day)
|
685
|
|
pH (pH
units)
|
6-10 (a)
|
|
Suspended
Solids
|
800
|
|
Biochemical Oxygen
Demand (5 days, 20°)
|
800
|
|
Chemical
Oxygen Demand
|
2,000
|
|
Oil &
Grease
|
40
|
|
Total
Nitrogen
|
200
|
|
Total
Phosphorus
|
50
|
|
Surfactants
(total)
|
25
|
|
Note:
(a) Range.
|
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 D),
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.
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 construction 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 – 639
|
680
|
Nil
|
Nil
|
|
Dust (or TSP)
|
0.2 – 5.3
|
6
|
Nil
|
Nil
|
|
Odour (including NH3 & H2S) (b)
|
0 – 340
|
220
|
Identified (b)
|
Resuming
normal operation after maintenance and calibration.
|
|
Notes:
(a) The odour unit is OU/Nm3.
(b) Dates with exceedances
on Odour
(including NH3 & H2S) (number of exceedances on the day) were identified on 17
(1) October and 17 (1) November 2020.
|
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 – 491
|
650
|
Nil
|
Nil
|
|
NOx
|
0 – 342
|
300
|
Identified (d)
|
Low biogas
loading resulting in low CHP efficiency. Supplier had been arranged to
fine-tune the equipment. Close monitoring of the biogas loading is performed
to prevent further exceedance.
|
|
SO2
|
0 – 58
|
50
|
Identified (e)
|
Low biogas
loading resulting in low CHP efficiency. Supplier had been arranged to
fine-tune the equipment. Close monitoring of the biogas loading is performed
to prevent further exceedance.
|
|
NMVOCs (b)
|
Nil
|
150
|
Nil
|
Nil
|
|
VOCs (including methane) (c)
|
0 – 1,253
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0 – 3
|
10
|
Nil
|
Nil
|
|
HF
|
0.0 – 1.0
|
1
|
Nil
|
Nil
|
|
Notes:
(a)
All
values refer to an oxygen content in the exhaust gas of 6%
and dry basis.
(b)
No
sampling was undertaken at CHP 1 as biogas production rate could not sustain
the operation of the CHP stack for the scheduled sampling on 14 August 2020.
(c)
The
VOCs emission limit include methane as biogas is adopted as fuel in the
combustion process.
(d)
Dates
with exceedances on NOx (number of exceedances on the day) were
identified on 20 (1), 21 (2) and 23 (2) September 2020 and 16 (2) and 17 (11)
November 2020.
(e)
1 exceedance on SO2
was identified on 24 September 2020.
|
Table 4.3 Hourly Average of Parameters Recorded for CHP 2
|
Parameter
|
Range of
Hourly Average Conc. (mg/Nm3) (a) (b)
|
Max.
Emission Limit (mg/Nm3)
|
Exceedance
Identified
|
Remarks
|
|
Dust (or
TSP)
|
0 – 6
|
15
|
Nil
|
Nil
|
|
Carbon
Monoxide
|
0 – 276
|
650
|
Nil
|
Nil
|
|
NOx
|
0 – 432
|
300
|
Identified (d)
|
Low biogas
loading resulting in low CHP efficiency. Supplier had been arranged to
fine-tune the equipment. Close monitoring of the biogas loading is performed
to prevent further exceedance.
|
|
SO2
|
0 – 44
|
50
|
Nil
|
Nil
|
|
NMVOCs (b)
|
Nil
|
150
|
Nil
|
Nil
|
|
VOCs (including methane) (c)
|
0 – 932
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0 – 0
|
10
|
Nil
|
Nil
|
|
HF
|
0 – 1.0
|
1
|
Nil
|
Nil
|
|
Notes:
(a)
All
values refer to an oxygen content in the exhaust gas of 6%
and dry basis.
(b)
Bi-annual
sampling of NMVOCs was conducted in CHP 2 on 14 August 2020. The hourly
average concentration for NMVOC was 2.7 mg/Nm3. No exceedance was
identified. 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 16 (13), 17 (24), 18 (24), 19 (22), 20 (17), 21 (10), 25 (11),
26 (21), 27 (2), 28 (8), 29 (15) and 30 (6) September 2020, 1 (15), 2 (2), 3
(5), 4 (13), 5 (17), 6 (12), 7 (23), 8 (18), 9 (7), 14 (1), 16 (5), 17 (4),
18 (17), 19 (10), 20 (5), 21 (4), 23 (3), 24 (2), 25 (3), 26 (20) and 27 (10)
October 2020 and 1 (1), 18 (8), 19 (13), 20 (22), 21 (23), 22 (11), 23 (11),
24 (10), 26 (23), 27 (24), 28 (15) and 30 (6) November 2020.
|
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 – 9
|
15
|
Nil
|
Nil
|
|
Carbon
Monoxide
|
0 – 116
|
650
|
Nil
|
Nil
|
|
NOx
|
0 – 337
|
300
|
Identified (d)
|
Low biogas
loading resulting in low CHP efficiency. Supplier had been arranged to
fine-tune the equipment. Close monitoring of the biogas loading is performed
to prevent further exceedance.
|
|
SO2
|
0 – 49
|
50
|
Nil
|
Nil
|
|
NMVOCs (b)
|
Nil
|
150
|
Nil
|
Nil
|
|
VOCs (including methane) (c)
|
0 – 1,283
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0 – 4
|
10
|
Nil
|
Nil
|
|
HF
|
0 – 1.0
|
1
|
Nil
|
Nil
|
|
Notes:
(a)
All
values refer to an oxygen content in the exhaust gas of 6%
and dry basis.
(b)
Sampling
was
conducted on 11 February 2020.
(c)
The
VOCs emission limit include methane as biogas is adopted as fuel in the
combustion process.
(d)
Dates
with exceedances on NOx (number of exceedances on the day) were
identified on 4 (3), 9 (3), 10 (1), 11(1), 12 (2), 16 (1), 17 (4), 18 (5) and
19 (6) October 2020.
|
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 – 4.6
|
5
|
Nil
|
Nil
|
|
Carbon Monoxide
|
0 – 789
|
100
|
Identified (c)
|
System
instability due to unstable column temperature. System maintenance were
performed to maintain operation efficiency
|
|
NOx
|
0 – 513
|
200
|
Identified (d)
|
System
instability due to unstable column temperature. System maintenance were
performed to maintain operation efficiency
|
|
SO2
|
0 –47
|
50
|
Nil
|
Nil
|
|
VOCs (including methane) (b)
|
0 – 930
|
20
|
Identified (e)
|
System
instability due to unstable column temperature. System maintenance were
performed to maintain operation efficiency
|
|
NH3
|
0 – 198
|
35
|
Identified (f)
|
System
instability due to unstable column temperature. System maintenance were
performed to maintain operation efficiency
|
|
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
11 (1), 20 (1) and 27 (1) October 2020 and 27 (1) November 2020.
(d)
Dates
with exceedances on NOx (number of exceedances on the day) were
identified on 1 (1), 5 (3), 6 (1), 7 (1), 10 (1), 11 (5), 12 (1), 20 (3), 21
(1), 22 (2), 26 (1), 27 (4) and 31 (1) October 2020 and 2 (2) 3 (1), 5 (5), 6
(4), 9 (1), 14 (1), 19 (3) and 27 (1) November 2020.
(e)
Dates
with exceedances on VOC (including methane) (number of exceedances on the
day) were identified on 4 (1), 11 (1), 20 (1) and 27 (1) October 2020 and 5
(1), 19 (1), 23 (1) and 27 (4) November 2020.
(f)
Dates
with exceedances on NH3 (number of exceedances on the day) were
identified on 3 (4), 4 (1), 8 (2), 14 (2), 19 (1), 21 (2), 26 (10), 27 (11)
and 28 (1) September 2020, 4 (3), 6 (2), 7 (1), 11 (4), 20 (8), 21 (4), 25
(3) and 29 (4) October 2020 and 1 (2), 8 (4), 9 (3), 13 (5), 18 (1), 19 (2),
23 (2), 27 (5) and 30 (2) November 2020.
|
4.2
Odour
September
2020
Odour patrol was conducted by the independent odour
patrol team of ALS Technichem (HK) Pty Ltd on 4 September 2020. According to
the EM&A Manual and EP requirements, it is considered an exceedance if the
odour intensity recorded by the panellists is Level 2 or above. During this
reporting period, no Level 2 Odour Intensity was recorded. The odour patrol
result is shown in Annex H.
October
2020
No odour patrol was required to be conducted for this
reporting period.
November
2020
No odour patrol was required to be conducted for this
reporting period.
Effluent discharge was sampled monthly from the
Effluent Storage Tank as stipulated in the operation phase discharge licence.
The results of the discharge sample is recorded in Table 4.6 to 4.8.
Table 4.6 Results of the Discharge Sample Collected on 10 September 2020
|
Parameters
|
Discharged
Effluent Concentration (mg/L)
|
Discharge
Limit (mg/L)
|
Compliance
with Discharge Limit
|
|
pH (pH
units)
|
7.03 – 7.99
|
6-10 (a)
|
Yes
|
|
Suspended
Solids
|
94
|
800
|
Yes
|
|
Biochemical
Oxygen Demand (5 days, 20°)
|
27
|
800
|
Yes
|
|
Chemical
Oxygen Demand
|
554
|
2,000
|
Yes
|
|
Oil &
Grease
|
<5
|
40
|
Yes
|
|
Total
Nitrogen
|
128
|
200
|
Yes
|
|
Total Phosphorus
|
31.2
|
50
|
Yes
|
|
Surfactants
(total)
|
1.4
|
25
|
Yes
|
|
Notes:
(a)
Daily
Average.
|
Table 4.7 Results of the Discharge Sample Collected on 30 October 2020
|
Parameters
|
Discharged
Effluent Concentration (mg/L)
|
Discharge
Limit (mg/L)
|
Compliance
with Discharge Limit
|
|
pH (pH
units)
|
6.83 – 7.95
|
6-10 (a)
|
Yes
|
|
Suspended
Solids
|
96
|
800
|
Yes
|
|
Biochemical
Oxygen Demand (5 days, 20°)
|
25
|
800
|
Yes
|
|
Chemical
Oxygen Demand
|
613
|
2,000
|
Yes
|
|
Oil &
Grease
|
<5
|
40
|
Yes
|
|
Total
Nitrogen
|
82.6
|
200
|
Yes
|
|
Total
Phosphorus
|
25.5
|
50
|
Yes
|
|
Surfactants
(total)
|
<1.0
|
25
|
Yes
|
|
Notes:
(a)
Daily
Average.
|
Table 4.8 Results of the Discharge Sample Collected on 12 November 2020
|
Parameters
|
Discharged
Effluent Concentration (mg/L)
|
Discharge
Limit (mg/L)
|
Compliance
with Discharge Limit
|
|
pH (pH
units)
|
7.9 – 9.26
|
6-10 (a)
|
Yes
|
|
Suspended
Solids
|
105
|
800
|
Yes
|
|
Biochemical
Oxygen Demand (5 days, 20°)
|
63
|
800
|
Yes
|
|
Chemical
Oxygen Demand
|
604
|
2,000
|
Yes
|
|
Oil &
Grease
|
<5
|
40
|
Yes
|
|
Total
Nitrogen
|
80.2
|
200
|
Yes
|
|
Total
Phosphorus
|
18.0
|
50
|
Yes
|
|
Surfactants
(total)
|
<1.0
|
25
|
Yes
|
|
Notes:
(a)
Daily
Average.
|
No exceedance of discharge limit was recorded during
the reporting period.
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
E). 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)
(d)
|
Recycled (c)
|
|
September
2020
|
400 L
|
579.64 tonnes
|
2.36 tonnes
|
3.00 tonnes (d)
|
0.00 tonnes
|
|
October
2020
|
0 L
|
840.75 tonnes
|
5.83 tonnes
|
2.76 tonnes (d)
|
0.00 tonne
|
|
November
2020
|
0 L
|
688.20 tonnes
|
0.8 tonnes
|
2.88 tonnes (d)
|
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, 8.99 tonne 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 tonnes of metals, 0.00 tonnes of papers/ cardboard
packing and
0 tonnes of plastics were sent to recyclers for recycling during the reporting
period.
(d) 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 inspections of
the landscape and visual mitigation measures for the operation phase of the
Project covered the operation phase environmental site inspections. The
inspections checked the implementation of the recommended mitigation measures
for air quality, landscape and visual, water quality, waste (land
contamination) and hazard-to-life stated in the Implementation Schedule (see Annex D).
Follow-up actions resulting
from the site inspections were generally taken as reported by the Contractor.
The Contractor has implemented
environmental mitigation measures recommended in the approved EIA Report and
EM&A Manual.
September 2020
The monthly inspection of
the landscape and visual mitigation measures for the operation phase of the
Project on 28 September 2020 covered the operation phase environmental site
audit. Joint site inspections was conducted by representatives of the
Contractor, ER, IEC and the MT on 28 September 2020 as required for the
operation of the Project.
October 2020
The monthly inspection of
the landscape and visual mitigation measures for the operation phase of the
Project on 23 October 2020 covered the operation phase environmental
site audit. Joint site inspections was conducted by representatives of the
Contractor, ER, IEC and the MT on 23 October 2020 as required for the operation
of the Project.
November 2020
The monthly inspection of
the landscape and visual mitigation measures for the operation phase of the
Project on 24 November 2020 covered the operation phase environmental
site audit. Joint site inspections was conducted by representatives of the
Contractor, IEC and the MT on 24 November 2020 as required for the operation of
the Project.
It was confirmed that the necessary landscape and visual mitigation measures
during the operation phase as summarised in Annex D were
generally implemented by the Contractor. No non-compliance in relation to the
landscape and visual mitigation measures was identified during the site audits
in this reporting period and therefore no further actions are required. The
ET/MT will keep track of the EM&A programme to check compliance with
environmental requirements and the proper implementation of all necessary
mitigation measures.
September
2020
Inspection
of the landscape and visual mitigation measures for the operation phase of the
Project was performed on 28
September 2020.
October
2020
Inspection
of the landscape and visual mitigation measures for the operation phase of the
Project was performed on 23
October 2020.
November
2020
Inspection
of the landscape and visual mitigation measures for the operation phase of the
Project was performed on 24
November 2020.
6
Environmental
Non-conformance
September 2020
Non-compliance of emission limits for CHP
and 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 air pollution
control systems for the CHP and ASP and identified several potential causes for
the exceedance. Remedial and follow-up actions had been recommended to the
Contractor to perform accordingly. The Investigation Report is show in Annex G.
October
2020
Non-compliance of emission limits for CAPCS,
CHP and 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 air pollution
control systems for the CAPCS, CHP and ASP and identified several potential
causes for the exceedance. Remedial and follow-up actions had been recommended
to the Contractor to perform accordingly. The Investigation Report is show in Annex G.
November
2020
Non-compliance of emission limits for
CAPCS, CHP and 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 air pollution
control systems for the CHP and the ASP and identified several potential causes
for the exceedance. Remedial and follow-up actions had been recommended to the
Contractor to perform accordingly. The Investigation Report is show in Annex G.
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 F.
7
Future Key Issues
Activities to be undertaken for the coming reporting
period are:
·
Operation of the
Project.
·
Modification of the CHP
and ASP to control the air emission.
8
Conclusions
This EM&A Report presents the EM&A programme undertaken
during the reporting period from 1 September 2020 to 30 November 2020
in accordance with EM&A Manual (Version F) and requirements of EP (FEP-01/395/2010/C).
For the operation phase, exceedances of the emission
limits for stack monitoring (including CAPCS, CHP and ASP stacks) were recorded
under normal operating conditions during the reporting period (see Table 8.1).
Table 8.1 Exceedances for Stack
Emissions
|
Stack
|
Exceedances
During the Reporting Period
|
|
Centralised
Air Pollution Control Unit (CAPCS)
|
·
Exceeded
emission limit of Odour (including NH3 & H2S) on
17 October 2020 and 17 November 2020
|
|
Cogeneration
Unit (CHP)
|
·
Exceeded
emission limit of NOx on 16, 17, 18, 19, 20, 21, 23, 25, 26, 27,
28, 29 and 30 September 2020, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 16,
17, 18, 19, 20, 21, 23, 24, 25, 26 and 27 October 2020 and 1, 16, 17, 18, 19,
20, 21, 22, 23, 24, 26, 27, 28 and 30 November 2020
·
Exceeded
emission limit of SO2 on 24 September 2020
|
|
Ammonia
Stripping Plant (ASP)
|
·
Exceeded
emission limit of CO on 11, 20 and 27 October 2020 and 27 November 2020
·
Exceeded
emission limit of NOx on 9, 17, 19 and 25 September 2020 and 2, 3,
4, 5, 9, 19, and 27 November 2020
·
Exceeded
emission limit of VOC (including methane) on 4, 11, 20 and 27 October 2020
and 5, 19, 23 and 27 November 2020
·
Exceeded
emission limit of NH3 on 3, 4, 8, 14, 19, 21, 26, 27 and 28
September 2020 and 1, 8, 9, 13, 16, 19, 23, 27 and 30 November 2020
|
Exceedances in emission parameters of CAPCS, CHP and
ASP were found to be results of system maintenance at CAPCS, low biogas loading
at CHP and incomplete combustion of biogas at ASP.
The Contractor has implemented mitigation measures to
control the exceedance including the continuous monitoring of CAPCS, CHP and
ASP to optimise overall performance.
Odour patrols were conducted in accordance to the
EM&A requirements. No exceedance of odour intensity limit for the odour
patrols.
No non-compliance to the effluent discharge limit was
recorded during this reporting period.
The environmental control /mitigation measures related
to air quality, water quality, waste (including land contamination prevention),
hazard-to-life and landscape and visual recommended in the approved EIA Report
and the EM&A Manual were properly implemented by the Contractor during the
reporting period.
Monthly landscape and visual monitoring were conducted
in the reporting period. The necessary landscape and visual mitigation
measures recommended in the approved EIA Report were generally implemented by
the Contractor.
No complaint/summon/prosecution was received.
