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
6.1
Summary of Environmental Non-Compliance
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 ANNEXES
Annex A |
|
Annex B |
|
Annex C |
|
Annex D |
|
Annex E |
|
Annex F |
|
Annex G |
|
Annex H |
|
Annex I |
Environmental complaint, Environmental Summons and
Prosecution Log |
Annex J |
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 48th
monthly Environmental Monitoring and Audit (EM&A) report presenting the
EM&A works carried out during the period from 1 to 31 May 2019 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
·
Construction of the Visitor Centre.
Environmental Monitoring and Audit
Progress
Air
Quality Monitoring
Exceedances
on NOx and SO2 from CHP and on Dust, CO, NOx, SO2, VOCs, NH3 and HF 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 for NOx control for 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 has implemented mitigation measures to control the exceedance by
further fine-tuning the thermal combustion unit of the ASP to optimise
combustion efficiency and overall performance.
The
Contractor is recommended to closely monitor the processes, including the
desulphurisation process, and combustion of biogas in the ASP to rectify any
abnormal operating conditions.
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. 4.16 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.
1,000
L of chemical waste was collected by licenced waste collector from the
operation of the Project.
528.22
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
2.88 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 390 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 |
4 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 IEC
was also present at the joint inspections on 31 May 2019. 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.
An
incident related to the leakage of treated effluent occurred on 21 May
2019.
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.
·
Contractor should resolve the technical issue related to the on-line monitoring
of methane emission (hence the calculation of the NMVOC concentration) from the
CHP stacks as soon as possible and undertake gas sampling every 10 days and
laboratory analysis of NMVOC when the on-line monitoring equipment for methane
is not available.
·
Implementation of further measures to control the air emission from the CHP and
ASP.
·
Continue construction of the Visitor Centre.
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 48th EM&A report which summarises the monitoring results
and audit findings for the EM&A programme during the reporting period from 1
to 31 May 2019.
The
structure of the report is as follows:
Section
1: Introduction
It details the
scope and structure of the report.
Section 2: Project Information
It summarises the background and scope of the Project,
site description, project organisation and status of the Environmental Permits
(EP)/licences.
Section
3: Environmental Monitoring and Audit Requirements
It
summarises the environmental monitoring requirements including monitoring
parameters, programmes, methodologies, frequency, locations, Action and Limit
Levels, Event/Action Plans, as well as environmental audit requirements as
recommended in the EM&A Manual and approved EIA report.
Section
4: Monitoring Results
It
summarises monitoring results of the reporting period.
Section
5: Site Audit
It
summarises the audit findings of the environmental as well as landscape and
visual site audits undertaken within the reporting period.
Section
6: Environmental Non-conformance
It
summarises any exceedance of environmental performance standard, environmental
complaints and summons received within the reporting period.
Section
7: Further Key Issues
It
summarises the impact forecast for the next reporting month.
Section
8: Conclusions
The
Organic Resources Recovery Centre (ORRC) Phase I development (hereinafter referred
to as “the Project”) is to design, construct and operate a biological treatment
facility with a capacity of about 200 tonnes per day and convert
source-separated organic waste from commercial and industrial sectors (mostly
food waste) into compost and biogas through proven biological treatment
technologies. The location of the Project site is shown in Annex A.
The environmental acceptability of the construction and operation of the
Project had been confirmed by findings of the associated Environmental Impact
Assessment (EIA) Study completed in 2009. The Director of Environmental
Protection (DEP) approved this EIA Report under the Environmental Impact
Assessment Ordinance (EIAO) (Cap. 499) in February 2010 (Register No.: AEIAR-149/2010) (hereafter referred to as the approved EIA Report).
Subsequent Report on Re-assessment on Environmental Implications and Report on
Re-assessment on Hazard to Life Implications were completed in 2013,
respectively.
An Environmental Permit (EP) (No. EP-395/2010) was issued by the DEP to the EPD (Project Team), the
Permit Holder, on 21 June 2010 and varied on 18 March 2013 (No. EP-395/2010/A)
and 21 May 2013 (No. EP-395/2010/B), respectively. The Design Build and
Operate Contract for the ORRC Phase 1 (Contract No. EP/SP/61/10 Organic
Resources Recovery Centre (Phase 1) (the Contract)) was awarded to SITA Waste
Services Limited, ATAL Engineering Limited and Ros-Roca,
Sociedad Anonima jointly
trading as the OSCAR Bioenergy Joint Venture (OSCAR or the Contractor). A
Further EP (No. FEP-01/395/2010/B) was issued by the DEP to the OSCAR on 16
February 2015. Variation to both EPs (Nos. EP-395/2010/B and
FEP-01/395/2010/B) were made in December 2015. The latest EPs, Nos.
EP-395/2010/C and FEP-01/395/2010/C, were issued by the DEP on 21 December
2015.
Under the requirements of Condition 5 of the EP (No. FEP-01/395/2010/C),
an Environmental Monitoring and Audit (EM&A) programme as set out in the
approved EM&A Manual (hereinafter referred to as EM&A Manual) is required
to be implemented during the construction and operation of the Project.
ERM-Hong Kong, Ltd (ERM) has been appointed by OSCAR as the Environmental Team
(ET) for the construction phase EM&A programme and the Monitoring Team (MT)
for the operation phase EM&A programme for the implementation of the
EM&A programme in accordance with the requirements of the EP and the
approved EM&A Manual.
The construction works commenced on 21 May 2015. The operation
phase of the EM&A programme commenced on 1 March 2019 ([1]).
The
Project Site is located at Siu Ho Wan in North Lantau with an area of about 2
hectares. The layout of the Project Site is illustrated
in Annex A. The
facility received 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. 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 ·
Construction of the Visitor Centre. |
The
project organisation chart and contact details are shown in Annex D.
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 |
- |
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.
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)
Due to technical issue related to the monitoring range of the methane sensor,
the monitoring of NMVOCs is conducted at agreed interval. (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 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.
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. 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.
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. E) 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 – 680 |
680 |
Nil |
Nil |
Dust (or TSP) |
0 - 2 |
6 |
Nil |
Nil |
Odour (including NH3 & H2S) (a) |
0 – 64 |
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 – 4 |
15 |
Nil |
Nil |
Carbon Monoxide |
0 – 567 |
650 |
Nil |
Nil |
NOx |
0 –320 |
300 |
Identified (d) |
CHP setting was fine-tuned for
performance optimisation. Continuous re-adjustment for NOx control
of CHP has been carried out. |
SO2 |
0 – 123 |
50 |
Identified (e) |
Tripping of the desulphurisation
column. Continuous monitoring to reduce the duration of tripping. |
NMVOCs (b) |
5 - 5.7 |
150 |
Nil |
See Annex G for laboratory
results |
VOCs
(including methane) (c) |
0 – 1,090 |
1,500 |
Nil |
Nil |
HCl |
0 – 2 |
10 |
Nil |
Nil |
HF |
0 – 0.4 |
1 |
Nil |
Nil |
Notes: (a) All values refer to an oxygen content in the exhaust gas of 6% and
dry basis. (b) Technical
issue related to monitoring range of methane sensors and the Contractor is
solving the problem together with the equipment suppliers. 2 samplings
were conducted during the reporting period because the biogas production rate
could not sustain the operation of the CHP stack for the scheduled sampling,
hence one of the scheduled sampling was cancelled. (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 (1), 27 (9), 29 (4) and 30 (2) May 2019. (e) Dates
with exceedances on SO2 (number of exceedances on the day) were
identified on 1 (1), 3 (1), 11 (2), 12 (7), 16 (4), 18 (3), 21 (2) and 22 (3)
May 2019. |
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 – 358 |
650 |
Nil |
Nil |
NOx |
0 – 628 |
300 |
Identified (d) |
CHP setting was fine-tuned for performance
optimisation. Continuous re-adjustment for NOx control of CHP has
been carried out. |
SO2 |
0 – 105 |
50 |
Identified (e) |
Tripping of the desulphurisation
column. Continuous monitoring to reduce the duration of tripping. |
NMVOCs (b) |
Not Available |
150 |
Nil |
Nil |
VOCs
(including methane) (c) |
0 – 1,281 |
1,500 |
Nil |
Nil |
HCl |
0 – 2 |
10 |
Nil |
Nil |
HF |
0 –1 |
1 |
Nil |
Nil |
Notes: (a) All values refer to an oxygen content in the exhaust gas of 6% and
dry basis. (b) Technical issue related to monitoring range of
methane sensors and the Contractor is solving the problem together with the
equipment suppliers. No sampling was undertaken at CHP2 as biogas production rate could not sustain the
operation of the CHP stack for the scheduled samplings. (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 1 (1), 15 (1), 16 (1), 20 (2), 21
(13) and 27 (9) May 2019. (e) Dates with exceedances on SO2 (number of
exceedances on the day) were identified on 16 (2), 20 (3) and 21 (2) May
2019. |
Table 4.4
Hourly Average of Parameters Recorded for CHP 3
Parameter |
Range of Hourly
Average Conc. (mg/Nm3) (a) |
Max. Emission Limit
(mg/Nm3) |
Exceedances Identified |
Remarks |
Dust (or TSP) |
0 – 7 |
15 |
Nil |
Nil |
Carbon Monoxide |
23 – 109 |
650 |
Nil |
Nil |
NOx |
26 – 274 |
300 |
Nil |
Nil |
SO2 |
1 – 34 |
50 |
Nil |
Nil |
NMVOCs (b) |
5.2 |
150 |
Nil |
See Annex G for laboratory
results |
VOCs
(including methane) (c) |
288 – 1,291 |
1,500 |
Nil |
Nil |
HCl |
0 – 1 |
10 |
Nil |
Nil |
HF |
0 – 1 |
1 |
Nil |
Nil |
Notes: (a) All values refer to an oxygen content in the exhaust gas of 6% and
dry basis. (b) Technical issue related to monitoring range of
methane sensors and the Contractor is solving the problem together with the
equipment suppliers. 1 sampling was conducted during the reporting
period because the biogas production rate could not sustain the operation of
the CHP stack for the 3 scheduled samplings, hence 2 scheduled samplings were
cancelled. (c)
The VOCs emission limit include
methane as biogas is adopted as fuel in the combustion process. |
Table 4.5
Hourly Average of Parameters Recorded for ASP
Parameter |
Range
of Hourly Average Conc. (mg/Nm3) (a) |
Max. Emission Limit
(mg/Nm3) |
Exceedances Identified |
Remarks |
Dust (or TSP) |
0 – 6 |
5 |
Identified (c) |
Ongoing optimisation of ASP
combustion efficiency has been carried out. |
Carbon Monoxide |
0 – 655 |
100 |
Identified (d) |
ASP tripped and stopped. Ongoing
optimisation of ASP combustion efficiency has been carried out. |
NOx |
0 – 519 |
200 |
Identified (e) |
ASP tripped and stopped. Ongoing
optimisation of ASP combustion efficiency has been carried out. |
SO2 |
0 – 70 |
50 |
Identified (f) |
ASP tripped and stopped. Ongoing
optimisation of ASP combustion efficiency has been carried out. |
VOCs
(including methane) (b) |
0 – 3,370 |
20 |
Identified (g) |
ASP tripped and stopped. Ongoing
optimisation of ASP combustion efficiency has been carried out. |
NH3 |
0 – 2,772 |
35 |
Identified (h) |
ASP tripped and stopped. Ongoing
optimisation of ASP combustion efficiency has been carried out. |
HCl |
0 – 4 |
10 |
Nil |
Nil |
HF |
0 – 1.5 |
1 |
Identified (i) |
ASP tripped and stopped. Ongoing
optimisation of ASP combustion efficiency has been carried out. |
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)
1 exceedance on Dust was identified on 8 May 2019. (d) Dates
with exceedances on CO (number of exceedances on the day) were identified on
9 (1), 17 (2) and 22 (1) May 2019. (e) Dates
with exceedances on NOx (number of exceedances on the day) were
identified on 2 (1), 5 (5), 6 (4), 8 (5), 9 (3), 11 (6), 12 (12), 13 (7), 14
(12), 15 (8), 17 (8), 18 (5), 19 (6), 20 (6), 22 (8), 24 (1), 25 (1) and 28
(1) May 2019. (f)
1 exceedance on SO2 was identified on 17 May 2019. (g) Dates
with exceedances on VOCs (including methane) (number of exceedances on the
day) were identified on 8 (1), 9 (2), 15 (1), 17 (4), 18 (1), 19 (4) and 20
(2) May 2019. (h) Dates
with exceedances on NH3 (number of exceedances on the day) were
identified on 1 (2), 2 (3), 3 (8), 4 (6), 5 (2), 6 (2), 7 (6), 8 (6), 9 (15),
10 (5), 11 (8), 12 (9), 13 (1), 14 (3), 15 (2), 17 (9), 18 (5), 19 (12), 20
(7), 22 (9), 23 (1), 24 (2), 30 (6) and 31 (7) May 2019. (i)
Dates with exceedances on HF (number of exceedances on the day) were
identified on 17 (1) and 20 (1) May 2019. |
No odour patrol was required to be conducted for this
reporting period.
No
odour patrol was required to be conducted for this reporting period.
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.
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) |
7.50 – 8.50 |
6-10 (a) |
Yes |
Suspended Solids (b) |
115 |
800 |
Yes |
Biochemical Oxygen Demand (5
days, 20°) (b) |
55 |
800 |
Yes |
Chemical Oxygen Demand (b) |
706 |
2,000 |
Yes |
Oil & Grease (b) |
<5 |
40 |
Yes |
Total Nitrogen (b) |
94 |
200 |
Yes |
Total Phosphorus (b) |
36.5 |
50 |
Yes |
Surfactants (total) (b) |
<1.0 |
25 |
Yes |
Notes: (a) Daily
Average. (b) Effluent
sample collected on 6 May 2019. |
No
exceedance of discharge limit was recorded during the reporting period.
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 H).
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 |
||
May 2019 |
0.00 tonnes |
0.00 kg |
4.16 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 A nnex H. (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. |
Wastes
generated from the operation of the Project include chemical waste, wastes
generated from pre-treatment process and general refuse ([3]).
Reference has been made to the Monthly Summary Waste Flow Table prepared by the
Contractor (see Annex H).
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) |
April 2019 |
1,000 L |
528.22 tonnes |
0.00 tonnes |
2.88 tonnes (d) |
390 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 390 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. |
Joint site inspections were conducted by representatives of the
Contractor and the ET on 7, 17, 24 and 31 May 2019 as
required for the construction of the Project. The IEC was present at the
joint inspection on 31 May 2019.
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:
7 May 2019
·
No particular observation during this inspection.
17 May 2019
·
No particular observation during this inspection.
24 May 2019
·
No particular observation during this inspection.
31 May 2019
·
There was no display of the approval/exemption label for one of the non-road
mobile machineries (i.e. a lifting platform) used. The contractor was
advised to provide the approval/exemption label in accordance to the Air
Pollution Control (Non-road Mobile Machinery) (Emission) Regulation.
Other
than the above observation, the Contractor has implemented environmental
mitigation measures recommended in the approved EIA Report and EM&A
Manual.
The monthly inspection of the landscape and visual mitigation measures
for the operation phase of the Project on 31 May 2019 covered the operation
phase environmental site audit. Joint site inspections was conducted by
representatives of the Contractor, IEC and the MT on 31 May 2019 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:
31 May 2019
·
A chemical waste container without label was observed in the laboratory and
chemical drums were observed near Building 2. The contractor was advised to
clearly label the container in the laboratory and provide drip trays to the
chemical drums or replace the drums to designed storage area in accordance to
the Code of Practice.
Other
than the above observation, the Contractor has implemented environmental
mitigation measures recommended in the approved EIA Report and EM&A
Manual.
Inspection of the landscape and visual mitigation
measures for the construction phase of the Project was performed on 17 and 31
May 2019. Inspection of the landscape and visual mitigation measures for
the operation phase of the Project was performed on 31 May 2019.
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 May 2019. No non-compliance in relation to
the landscape and visual mitigation measures was identified during the site
audits in this reporting period and therefore no further actions are
required. The ET/MT will keep track of the EM&A programme to check
compliance with environmental requirements and the proper implementation of all
necessary mitigation measures.
Non-compliance
of emission limits 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 at a certain period of time which leads
to the exceedance for NOx limit for the CHP stacks;
(b) Tripping of the
desulphurisation column resulting in the incomplete desulphurisation of biogas
that leads to the exceedances of SO2 limits for CHP stacks; and
(c)
Tripping and stopping of the ASP and the ongoing performance optimisation of
the ASP result in the incomplete combustion of biogas. The unstable
emission leads to the exceedances of Dust, CO, NOx, SO2,
VOCs, NH3 and HF in ASP.
For
item (a), continuous optimisation of CHP and re-adjustment of NOx
control for CHP has been carried out. It is expected to complete 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 stacks.
For
item (c), the Contractor will continue to fine-tune the thermal combustion unit
of the ASP in order to restore the combustion efficiency so that the concerned
pollutants will be effectively destroyed.
The
investigation report is presented in Annex J.
Leakage
of treated effluent was observed at the discharge outlet on 21 May 2019.
The investigation report and the extract of the incident report provided by the
Contractor are presented in Annex
J.
Activities to be undertaken for the coming reporting period are:
· Operation
of the Project.
· Contractor
should resolve the technical issue related to the on-line monitoring of methane
emission (hence the calculation of the NMVOC concentration) from the CHP stacks
as soon as possible and undertake gas sampling and laboratory analysis of NMVOC
at agreed interval when the on-line monitoring equipment for methane is not
available.
· Implementation
of measures to further rectify the abnormal operating conditions for the CHP
and ASP.
· Continue
construction of the Visitor Centre.
This
EM&A Report presents the EM&A programme undertaken during the reporting
period from 1 to 31 May 2019 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 stack monitoring
(including 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 |
Cogeneration Unit (CHP) |
·
Exceeded emission limit of NOx on 1, 15, 26, 20, 21, 27, 29 and 30
May 2019 ·
Exceeded emission limit of SO2 on 1, 3, 11, 12, 16, 18 and 20 to
22 May 2019 |
Ammonia Stripping Plant (ASP) |
·
Exceeded emission limit of Dust on 8 May 2019 ·
Exceeded emission limit of CO on 9, 17 and 22 May 2019 ·
Exceeded emission limit of NOx on 2, 5, 6, 8, 9, 11 to 15, 17 to
20, 22, 24, 25 and 28 May 2019 ·
Exceeded emission limit of SO2 on 17 May 2019 ·
Exceeded emission limit of VOCs on 8, 9, 15 and 17 to 20 May 2019 ·
Exceeded emission limit of NH3 on 1 to 15, 17 to 20, 22 to 24, 30
and 31 May 2019 ·
Exceeded emission limit of HF on 17 and 20 May 2019 |
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 for NOx control for 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).
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.
An
incident related to the leakage of treated effluent occurred on 21 May
2019.
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.