Contents
Executive Summary
1.1
Purpose of the Report
1.2
Structure of the Report
2.1
Background
2.2
General Site Description
2.3
Major Activities Undertaken
2.4
Project Organisation and Management
Structure
2.5
Status of Environmental Approval Documents
3
Environmental Monitoring and Audit Requirements
3.1
Environmental Monitoring
3.1.1
Air Quality
3.1.2
Odour
3.2
Site
Audit
3.2.1
Water
Quality
3.2.2
Landscape and Visual
4.1
Air Quality
4.1.1
Commissioning Phase Monitoring
4.1.2
Operation Phase Monitoring
4.2
Odour
4.2.1
Commissioning Phase Monitoring
4.2.2
Operation Phase Monitoring
4.3
Water Quality
4.3.1
Construction Phase Monitoring
4.3.2
Operation Phase Monitoring
4.4
Waste Management
4.4.1
Construction Phase Monitoring
4.4.2
Operation Phase Monitoring
5.1
Environmental Site Audit
5.1.1
Construction Phase
5.1.2
Operation Phase
5.2
Landscape and Visual Audit
6
Environmental Non-conformance and Deficiencies
6.1
Summary of Environmental Non-Compliance and
Deficiencies
6.2
Summary of Environmental Complaint
6.3
Summary of Environmental Summon and
Successful Prosecution
7.1
Key Issues for the Coming Month
LIST OF TABLES
Table 2.1
Summary of Activities Undertaken in the Reporting
Period
Table 2.2
Summary of Environmental Licensing, Notification and
Permit Status
Table 3.1
Sampling and Laboratory Analysis Methodology
Table 3.2
Emission Limit for CAPCS Stack
Table 3.3
Emission Limit for CHP Stack
Table 3.4
Emission Limit for ASP Stack
Table 3.5
Emission Limit for Standby Flaring Gas Unit ()
Table 3.6
Odour Intensity Level
Table 3.7
Action and Limit Levels for Odour Nuisance
Table 3.8
Event and Action Plan for Odour Monitoring
Table 3.9
Discharge Limits for Effluent
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
Table 4.7
Quantities of Waste Generated from the Construction of
the Project
Table 4.8
Quantities of Waste Generated from the Operation of
the Project
LIST OF ANNEXES
|
Annex A |
|
|
Annex B |
|
|
Annex C |
|
|
Annex D |
|
|
Annex E |
|
|
Annex F |
|
|
Annex G |
|
|
Annex H |
Environmental
complaint, Environmental Summons and Prosecution Log |
|
Annex I |
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 56th
monthly Environmental Monitoring and Audit (EM&A) report presenting the
EM&A works carried out during the period from 1 to 31 January 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.
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;
·
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; and
·
Visitor Centre BS works (exhibition fixture installation).
Environmental
Monitoring and Audit Progress
Air Quality
Monitoring
Exceedances
on NOx and VOCs (including methane) from CHP and Dust, NOx,
VOCs (including methane) and NH3 from ASP were recorded on the
on-line monitoring system. 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 CHP and ASP were found to be a result of problems
with the continuous fine-tuning of CHP setting, incomplete desulphurisation of
biogas which fed to the CHPs, and tripping and stopping of ASP and the
incomplete thermal combustion of the thermal combustion unit of the ASP.
The
Contractor has implemented mitigation measures to control the exceedance (including
the re-adjustment of CHP; continuous monitoring and routine maintenance of the
desulphurisation column is carried out; 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.
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 construction of the Project includes inert construction and
demolition (C&D) materials (public fill) and non-inert C&D materials
(construction wastes).
Inert
C&D materials (public fill) include bricks, concrete, building debris,
rubble and excavated spoil. In total, 0.00 tonnes of inert C&D material
were generated from the construction of the Project.
Non-inert
C&D materials (construction wastes) from the construction of this Project
include metals, paper/ cardboard packaging waste, plastics and other wastes
such as 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. 0.00 tonnes of general refuse was disposed of at the
landfill.
0.00
L of chemical waste was collected by licenced waste collector from the
construction of the Project.
Waste
generated from the operation of the Project includes chemical waste, waste
generated from pre-treatment process and general refuse.
0.00
L of chemical waste was collected by licenced waste collector from the
operation of the Project.
388.20
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 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.
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 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.
Findings
of Environmental Site Audit
A summary of the monitoring activities
undertaken in this reporting period is listed below:
|
· Joint Environmental Site Inspections |
5 times |
|
· Landscape & Visual Inspections |
2 times |
4 weekly joint environmental site inspections were carried out by the representatives
of the Contractor and the ET. The ER and IEC were also present at the
joint inspections on 17 January 2020. 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.
·
Modification of the ASP to control the air emission.
·
Visitor Centre BS works (exhibition fixture installation).
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.
1.2 Purpose of the Report
This is the 56th
EM&A report which summarises the monitoring results and audit
findings for the EM&A programme during the reporting period from 1 to
31 January 2020.
1.3 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 operation
phase of the EM&A programme commenced on 1 March 2019 ([1]).
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 and treated an average of 100 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.
The site layout plan is shown in Annex B. The
construction programme is shown in Annex C.
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); ·
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; and ·
Visitor Centre BS works (exhibition fixture installation). |
2.4 Project
Organisation and Management Structure
The project organisation
chart and contact details are shown in Annex D.
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 |
|
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-RW0280-19 (Superseded
CNP GW-RW0538-18) |
21 July
2019-20 January 2020 |
Approved on 28 June 2019 |
|
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
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. No monitoring for
noise, waste, land contamination, hazard-to-life and landscape and visual are
required during construction and operation phases of the Project.
Although water quality monitoring is not required for the construction and
operation phases 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 calibration certificate for the on-line monitoring
equipment is provided in Annex E.
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. |
|
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([3]).
The perceived
odour intensity is divided into 5 levels. Table 3.6 describes the
odour intensity for different levels.
Table 3.6
Odour Intensity Level
|
Level |
Odour Intensity |
|
0 |
Not detected. No odour perceived
or an odour so weak that it cannot be easily
characterised or described |
|
1 |
Slight identifiable odour,
and slight chance to have
odour nuisance |
|
2 |
Moderate identifiable
odour, and moderate chance to have odour nuisance |
|
3 |
Strong identifiable, likely
to have odour nuisance |
|
4 |
Extreme severe odour,
and unacceptable odour level |
Table
3.7 shows the action level and limit level to be used for
odour patrol. Should any exceedance of the action and limit levels occurs,
actions in accordance with the event and action plan in Table 3.8 should
be carried out.
Table
3.7
Action and Limit Levels for Odour Nuisance
|
Parameter |
Action Level |
Limit Level |
|
Odour Nuisance (from odour
patrol) |
When one documented compliant is
received (a), or Odour Intensity of 2 is measured from odour patrol. |
Two or
more documented complaints
are received (a) within a week; or Odour intensity of 3 or above
is measured from odour patrol. |
|
Note: (a)
Once the complaint is received by the Project Proponent (EPD), the Project
Proponent would investigate and verify the complaint whether it is related to
the potential odour emission from the ORRC1 and its on-site wastewater
treatment unit. |
||
Table
3.8
Event and Action Plan for Odour Monitoring
|
Event |
Action |
|
|
|
Person-in-charge of
Odour Monitoring |
Project Proponent (a) |
|
Action Level |
|
|
|
Exceedance of action level
(Odour Patrol) |
1. Identify source/reason of
exceedance; 2. Repeat odour patrol to confirm
finding. |
1. Carry out investigation to
identify the source/reason of exceedance. Investigation should
be completed within 2 weeks; 2. Rectify any unacceptable
practice; 3. Implement more mitigation
measures if necessary; 4. Inform Drainage Services
Department (DSD) or the operator of the Siu Ho Wan Sewage Treatment Works
(SHWSTW) if exceedance is considered to be caused by the operation of the
SHWSTW. 5. Inform North Lantau Refuse
Transfer Station (NLTS) operator if exceedance is considered to be caused by
the operation of NLTS. |
|
Exceedance of action level
(Odour Complaints) |
1. Identify source/reason of
exceedance; 2. Carry out odour patrol to
determinate odour intensity. |
1. Carry out investigation and
verify the complaint whether it is related to potential odour emission from
the nearby SHWSTW; 2. Carry out investigation to
identify the source/reason of exceedance. Investigation should be
completed within 2 weeks; 3. Rectify any unacceptable
practice; 4. Implement more mitigation
measures if necessary; 5. Inform DSD or the operator of
the SHWSTW if exceedance is considered to be caused by the operation of the
SHWSTW. 6. Inform NLTS operator if
exceedance is considered to be caused by the operation of NLTS. |
|
Limit Level |
|
|
|
Exceedance of limit level |
1. Identify source/reason of
exceedance; 2. Inform EPD; 3. Repeat odour patrol to
confirm findings; 4. Increase odour patrol
frequency to bi-weekly; 5. Assess effectiveness of
remedial action and keep EPD informed of the results; 6. If exceedance stops, cease
additional odour patrol. |
1. Carry out investigation to
identify the source/reason of exceedance. Investigation should be
completed within 2 week; 2. Rectify any unacceptable
practice; 3. Formulate remedial actions; 4. Ensure remedial actions properly
implemented; 5. If exceedance continues,
consider what more/enhanced mitigation measures should be implemented; 6. Inform DSD or the operator of
the SHWSTW if exceedance is considered to be caused by the operation of the
SHWSTW. |
|
Note: (a)
Project Proponent shall identify an implementation agent. |
||
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 construction and operation phase of the Project are recommended in
the approved EIA Report and EM&A Manual and are summarised in Annex F.
Weekly site audits for construction phase and 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. 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. |
|
3.2.2 Landscape
and Visual
In accordance
with EM&A Manual, the landscape and visual mitigation measures shall be
implemented. Bi-weekly landscape and visual audit during the construction
phase is required to ensure that the design, implementation and maintenance of
landscape and visual mitigation measures recommended in the approved EIA Report
are fully achieved. The implementation status of the mitigation measures
for construction phase is summarised in Annex F.
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 F), 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
4.1 Air
Quality
4.1.1 Commissioning
Phase Monitoring
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.
4.1.2 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). 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) |
21 – 61 |
680 |
Nil |
Nil |
|
Dust (or TSP) |
0.0 |
6 |
Nil |
Nil |
|
Odour (including NH3 & H2S) (a) |
0 – 46 |
220 |
Nil |
Nil |
|
Notes: (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 – 12 |
15 |
Nil |
Nil |
|
Carbon Monoxide |
0 – 357 |
650 |
Nil |
Nil |
|
NOx |
0 – 299 |
300 |
Nil |
Nil |
|
SO2 |
0 – 128 |
50 |
Identified (d) |
Tripping of the desulphurisation
system. |
|
NMVOCs (b) |
Nil |
150 |
Nil |
Nil |
|
VOCs
(including methane) (c) |
0 – 1,286 |
1,500 |
Nil |
Nil |
|
HCl |
0 – 1 |
10 |
Nil |
Nil |
|
HF |
0.0 – 0.5 |
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 required during this reporting
period. The last sampling date was 19 November 2019. (c) The VOCs
emission limit include methane as biogas is adopted as fuel in the combustion
process. (d) Dates with exceedances on SO2 (number of
exceedances on the day) were identified on 12 (9), 14 (1), 16 (1) and 29 (1)
January 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 – 14 |
15 |
Nil |
Nil |
|
Carbon Monoxide |
0 – 141 |
650 |
Nil |
Nil |
|
NOx |
0 – 353 |
300 |
Identified (d) |
Supplier had been arranged to
check the performance of the CHP and maintenance will be arranged after
detailed investigation. |
|
SO2 |
0 – 57 |
50 |
Identified (e) |
Tripping of the desulphurisation
system. |
|
NMVOCs (b) |
Nil |
150 |
Nil |
Nil |
|
VOCs (including
methane) (c) |
0 – 1,378 |
1,500 |
Nil |
Nil |
|
HCl |
0 – 1 |
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) No sampling
was required during this reporting period. The last sampling date was
19 November 2019. (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 9 (1), 13 (1), 14 (1) and 21 (3) January 2020. (e) 2 exceedances on SO2 were identified on
12 January 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 |
15 |
Nil |
Nil |
|
Carbon Monoxide |
0 – 203 |
650 |
Nil |
Nil |
|
NOx |
0 – 462 |
300 |
Identified (d) |
Supplier had been arranged to
check the performance of the CHP and maintenance will be arranged after
detailed investigation. |
|
SO2 |
0 – 86 |
50 |
Identified (e) |
Tripping of the desulphurisation
system. |
|
NMVOCs (b) |
Nil |
150 |
Nil |
Nil |
|
VOCs
(including methane) (c) |
0 – 1,529 |
1,500 |
Identified (f) |
Supplier had been arranged to check
the performance of the CHP and maintenance will be arranged after detailed
investigation. |
|
HCl |
0 – 1 |
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) No sampling
was required during this reporting period. The last sampling date was
19 November 2019. (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 12 (6), 13 (11), 16 (9), 17 (3), 18 (10), 19 (24), 20 (14), 21
(13), 22 (7), 24 (9), 25 (6), 26 (1), 28 (1), 29 (4), 30 (3) and 31 (12)
January 2020. (e) Dates with
exceedances on SO2 (number of exceedances on the day) were
identified on 11 (3), 12 (6), 16 (1), 17 (2), 18 (1), 19 (9), 25 (5), 26 (5),
27 (4), 28 (9), 29 (16), 30 (12) and 31 (2) January 2020. (f) Dates
with exceedances on VOCs (including methane) (number of exceedances on the
day) were identified on 20 (2), 21 (2) and 22 (3) January 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 – 8.0 |
5 |
Identified (c) |
Modification of the ASP is being
arranged with the supplier. The supplier will be on-site to complete the
modification and review the ASP operation. |
|
Carbon Monoxide |
0 – 30 |
100 |
Nil |
Nil |
|
NOx |
0 – 918 |
200 |
Identified (d) |
Modification of the ASP is being
arranged with the supplier. The supplier will be on-site to complete the
modification and review the ASP operation. |
|
SO2 |
0 – 40 |
50 |
Nil |
Nil |
|
VOCs
(including methane) (b) |
0 – 124 |
20 |
Identified (e) |
Modification of the ASP is being
arranged with the supplier. The supplier will be on-site to complete the
modification and review the ASP operation. |
|
NH3 |
0 – 177 |
35 |
Identified (f) |
Modification of the ASP is being arranged
with the supplier. The supplier will be on-site to complete the modification
and review the ASP operation. |
|
HCl |
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 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 Dust (or TSP) (number of exceedances on the day) were
identified on 7 (1), 25 (1) and 26 (1) January 2020. (d) Dates with
exceedances on NOx (number of exceedances on the day) were
identified on 1 (10), 2 (8), 3 (4), 5 (9), 6 (3), 7 (6), 8 (6), 10 (3), 13
(2), 14 (1), 15 (12), 16 (5), 17 (4), 19 (6), 22 (12), 23 (8), 25 (4), 26
(6), 27 (5) and 30 (1) January 2020. (e) 2
exceedances on VOCs (including methane) (number of exceedances on the day)
were identified on 21 January 2020. (f)
Dates with exceedances on NH3 (number of exceedances on the
day) were identified on 20 (1), 21 (3), 27 (1), 28 (3), 30 (3) and 31 (7)
January 2020. |
||||
4.2 Odour
4.2.1 Commissioning
Phase Monitoring
No odour patrol was required to be conducted for this
reporting period.
4.2.2 Operation
Phase Monitoring
No odour patrol
was required to be conducted for this reporting period.
4.3 Water
Quality
4.3.1 Construction
Phase Monitoring
No effluent was
discharged from the construction activity in the reporting month, hence it was
not necessary to carry out effluent discharge sampling for this reporting
period.
4.3.2 Operation
Phase Monitoring
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.
Table 4.6
Results of the Discharge Sample
|
Parameters |
Discharged Effluent
Concentration (mg/L) |
Discharge Limit
(mg/L) |
Compliance with
Discharge Limit |
|
pH (pH units) |
7.7 – 8.72 |
6-10 (a) |
Yes |
|
Suspended Solids (b) |
58 |
800 |
Yes |
|
Biochemical Oxygen Demand (5
days, 20°) (b) |
16 |
800 |
Yes |
|
Chemical Oxygen Demand (b) |
408 |
2,000 |
Yes |
|
Oil & Grease (b) |
<5 |
40 |
Yes |
|
Total Nitrogen (b) |
87.6 |
200 |
Yes |
|
Total Phosphorus (b) |
30.3 |
50 |
Yes |
|
Surfactants (total) (b) |
<1.0 |
25 |
Yes |
|
Notes: (a) Daily
Average. (b) Effluent
sample collected on 9 January 2020. |
|||
No exceedance of
discharge limit was recorded during the reporting period.
4.4 Waste
Management
4.4.1 Construction
Phase Monitoring
Wastes generated
from this Project include inert construction and demolition (C&D) materials
(public fill) and non-inert C&D materials (construction waste).
Construction waste comprises general refuse, metals and paper/cardboard
packaging materials. Metals generated from the construction of the
Project are also grouped into construction waste as the materials were not
disposed of with others at public fill. Reference has been made to the
Monthly Summary Waste Flow Table prepared by the Contractor (see Annex G).
With reference to the relevant handling records and trip tickets of this Project,
the quantities of different types of waste generated in the reporting month are
summarised in Table 4.7.
Table 4.7
Quantities of Waste Generated from the Construction of the Project
|
Month / Year |
Quantity |
|||
|
|
Total Inert C&D Materials Generated (a) |
Non-inert C&D Materials (b) |
||
|
C&D Materials Recycled (c) |
C&D Waste Disposed of at Landfill (d)
|
Chemical Waste |
||
|
January 2020 |
0.00 tonnes |
0.00 kg |
0.00 tonnes |
0.00 L |
|
Notes: (a) Inert
C&D materials (public fill) include bricks, concrete, building debris,
rubble and excavated spoil. In total, 0.00 tonnes of inert C&D
material were generated from the Project. The detailed waste flow is
presented in Annex
G. (b) Non-inert C&D
materials (construction wastes) include metals, paper / cardboard packaging
waste, plastics and other wastes such as general refuse. Metals
generated from the Project were grouped into construction wastes as the
materials were not disposed of with others at the public fill. (c) 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) Construction
wastes other than metals, paper/cardboard packaging, plastics and chemicals
were disposed of at NENT Landfill by subcontractors. |
||||
4.4.2 Operation
Phase Monitoring
Wastes generated
from the operation of the Project include chemical waste, wastes generated from
pre-treatment process and general refuse ([4]).
Reference has been made to the Monthly Summary Waste Flow Table prepared by the
Contractor (see Annex
G). 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
4.8.
Table 4.8
Quantities of Waste Generated from the Operation of the Project
|
Month / Year |
Chemical Waste |
Waste Generated from |
General Refuse |
||
|
|
Disposal of at CWTC |
Disposed of at Landfill (a) |
Recycled (b) |
Disposed of at Landfill (a) |
Recycled (c) |
|
January 2020 |
0 L |
388.20 tonnes |
0.00 tonnes |
2.65 tonnes (d) |
0 kg |
|
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 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. (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)
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
Construction Phase
Joint site inspections were conducted by representatives of the
Contractor and the ET on 3, 9, 17, 22 and 31 January 2020 as required for the
construction of the Project. The IEC and ER were present at the joint
inspection on 17 January 2020.
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 F).
Follow-up actions resulting from the last site inspections were
generally taken as reported by the Contractor.
Key observations
during the reporting period are summarised as follows:
3 January 2020
· No particular observation during this
inspection.
9 January 2020
· No particular observation during this
inspection.
17 January 2020
· No particular observation during this
inspection.
22 January 2020
· No particular observation during this
inspection.
31 January 2020
· No particular observation during this
inspection.
Other than the
above observation, the Contractor has implemented environmental mitigation
measures recommended in the approved EIA Report and EM&A Manual.
5.1.2 Operation
Phase
The monthly inspection of the landscape and visual mitigation measures
for the operation phase of the Project on 17 January 2020 covered the operation
phase environmental site audit. Joint site inspections was conducted by
representatives of the Contractor, ER, IEC and the MT on 17 January 2020 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 F).
Follow-up actions resulting from the last site inspections were
generally taken as reported by the Contractor.
Key observations
during the reporting period are summarised as follows:
17 January 2020
· 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 construction phase of the Project was performed on 17 and 31
January 2020. Inspection of the landscape and visual mitigation measures
for the operation phase of the Project was performed on 17 January 2020.
It was confirmed
that the necessary landscape and visual mitigation measures during the
construction and operation phase as summarised in Annex F were
generally implemented by the Contractor. No specific observation was
found during site inspections on 17 and 31 January 2020. 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 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 system and the combustion system of the
CHP and ASP and identified the following potential causes for the
exceedance.
(a) CHP setting
was undergoing fine-tuning for performance optimisation. Therefore, it
could not effectively remove NOx and VOCs (including methane) at a
certain period of time which leads to the exceedance for NOx and
VOCs (including methane) limit for the CHP stacks;
(b)
Tripping of the circulation pump resulting in the incompletion desulphurisation
of biogas which gave rise to exceedances of SO2 limits for CHP and
ASP stacks.
(c) The
ongoing performance optimisation of the ASP result in the incomplete combustion
of biogas. The unstable emission leads to the exceedances of Dust, NOx,
VOCs (including methane) and NH3 in ASP.
For item (a), it
was arranged with the supplier of CHPs to check the performance of CHPs onsite
during the reporting period. The supplier will conduct a detailed
investigation of the remaining exceedance recorded on the CHPs. After the
investigation, the Contractor will perform the maintenance work according to
suggestions raised by the supplier in the next reporting period.
For item (b),
routine maintenance of the desulphurisation column, e.g. cleaning of sensors,
has been carried out. Continuous monitoring of the desulphurisation
column will remain in place to reduce the duration of tripping which causes
exceedances in SO2 in CHP and ASP stacks.
For item (c),
parts of the modification works has been completed, with more components
waiting to be delivered to Hong Kong. The Contractor has scheduled the
remaining modification work for the next few reporting periods with schedule
shutdown of the ASP to facilitate the installation of equipment for performance
optimisation.
The
investigation report is presented in Annex I.
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 H.
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.
· Modification of the ASP to control the air
emission.
· Visitor Centre BS works (exhibition fixture
installation).
8 Conclusions
This EM&A
Report presents the EM&A programme undertaken during the reporting period
from 1 to 31 January 2020 in accordance with EM&A Manual
(Version E) and requirements of EP (FEP-01/395/2010/C).
No air quality,
noise and water quality monitoring is required under the construction EM&A
requirements.
For the
operation phase, exceedances of the emission limits for 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 (CHP) |
·
Exceeded emission limit of NOx on 9, 12, 13, 14, 16, 17, 18, 19,
20, 21, 22, 24, 25, 26, 28, 29, 30 and 31 January 2020 ·
Exceeded emission limit of SO2 on 11, 12, 14, 16, 17, 18, 19, 25,
26, 27, 28, 29, 30 and 31 January 2020 ·
Exceeded emission limit of VOCs (including methane) on 20, 21 and 22 January
2020 |
|
Ammonia Stripping Plant (ASP) |
·
Exceeded emission limit on Dust (or TSP) on 7, 25 and 26 January 2020 ·
Exceeded emission limit of NOx on 1, 2, 3, 5, 6, 7, 8, 10, 13, 14,
15, 16, 17, 19, 22, 23, 25, 26, 27 and 30 January 2020 ·
Exceeded emission limit of VOCs (including methane) on 21 January 2020 ·
Exceeded emission limit of NH3 on 20, 21, 27, 28, 30 and 31
January 2020. |
Exceedances
in emission parameters of CHP and ASP were found to be a result of the continuous
fine-tuning of CHP and ASP setting.
The
Contractor has implemented mitigation measures to control the exceedance, which
is the modification of the CHP and ASP to optimise overall performance.
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
month.
Bi-weekly
landscape and visual monitoring were conducted in the reporting period.
The necessary landscape and visual mitigation measures recommended in the
approved EIA Report were generally implemented by the Contractor.
No
complaint/summon/prosecution was received.
([1])
As some of the minor items are yet to be closed out in March 2019, the construction
phase EM&A programme and Operation Phase EM&A programme were
undertaking in parallel in March 2019.
([2])
A standby facility. Only operate when the CHPs are not in
operation or when the biogas generated exceeded the utilisation rate of the CHPs.