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
Operation Phase
Monitoring
4.3
Water Quality
4.3.1
Operation Phase
Monitoring
4.4
Waste Management
4.4.1
Operation Phase Monitoring
5.1
Environmental Site Audit
5.1.1
Operation Phase
5.2
Landscape and Visual Audit
6
Environmental Non-conformance
6.1
Summary of Environmental Non-Compliance
6.2
Summary of Environmental Complaint
6.3
Summary of Environmental Summon and Successful Prosecution
7.1
Key Issues for the Coming Reporting Period
LIST
OF ANNEXES
|
Annex A |
|
|
Annex B |
|
|
Annex C |
|
|
Annex D |
|
|
Annex E |
|
|
Annex F |
|
|
Annex G |
Environmental complaint,
Environmental Summons and Prosecution Log |
|
Annex H |
|
|
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 21st
quarterly Environmental Monitoring and Audit (EM&A) report presenting the
EM&A works carried out during the period from 1 June 2020 to 31 August 2020
in accordance with the EM&A Manual. Substantial completion of the
construction works was confirmed on 3 December 2018. In the meantime, the
operation phase EM&A programme had commenced in March 2019. Substantial
Completion in respect of substantial part of the Works was confirmed on 24
February 2020. The construction phase EM&A programme was completed in
the end of February 2020.
Summary
of Works undertaken during the Reporting Month
Works
undertaken in the reporting month included:
·
Operation of the Project, including organic waste reception, and operation of
the pre-treatment facilities, anaerobic digesters, composting facilities, air
pollution control systems, on-line emission monitoring system for the
Centralised Air Pollution Control Unit (CAPCS), Co-generation Units (CHP)s and
Ammonia Stripping Plant (ASP), and the wastewater treatment plant; and
·
Process fine-tune, including adjustment of the ASP with new treatment media,
modification of Continuous Environmental Monitoring System (CEMS) and
Supervisory Control and Data Acquisition System (SCADA) rectification and
improvement works following equipment failures and the alteration of different
operation modes and measures to adapt to the high variation of SSOW nature and
sources.
Environmental Monitoring and Audit
Progress
Air
Quality Monitoring
Exceedances
on NOx and SO2 from CHP and Carbon Monoxide, NOx,
VOCs (including methane) and NH3 from ASP were recorded on the
on-line monitoring system in June 2020. Exceedances on Odour (including
NH3 and H2S), NOx and SO2 from CHP
and Carbon Monoxide, NOx, SO2, VOCs (including methane),
NH3, HCL and HF from ASP were recorded on the on-line monitoring
system in July 2020. Exceedances on NOx from CHP and NOx
and NH3 from ASP were recorded on the on-line monitoring system in
August 2020. It
should be noted that measurements recorded under abnormal operating conditions,
e.g. start up and stopping of stacks, unstable operation, test runs and
interference of sensor, are disregarded.
Exceedances
in emission parameters of CAPCS, CHP and ASP were found to be a result of
problems with system maintenance at CAPCS, low biogas loading at CHP and
incomplete combustion of biogas at ASP.
The
Contractor has implemented mitigation measures to control the exceedance
(including continuous monitoring of CAPCS, arranging for the supplier of CHP to
perform on-site adjustment to improve CHP performance and tuning the thermal
combustion unit of the ASP to optimise combustion efficiency and overall
performance).
The
Contractor is recommended to closely monitor the processes of the modification
of the ASP and the post-modification monitoring of emission level to avoid any
exceedance.
Odour
Odour
patrols were conducted by the independent odour patrol team of ALS Technichem
(HK) Pty Ltd on 3 July 2020 and 14 August 2020. No Level 2 Odour
Intensity was recorded during odour patrols.
Water Quality
No non-compliance to the effluent discharge limit
stipulated in the discharge licence issued by the EPD under the Water
Pollution Control Ordinance was recorded during this reporting period.
Waste Management
Waste
generated from the operation of the Project includes chemical waste, waste
generated from pre-treatment process and general refuse.
200 L
of chemical waste was collected by licenced waste collector from the operation
of the Project.
1,899.55
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
8.76 tonnes of general refuse from the operation of the Project was disposed of
at landfill. Among the recycled general refuse from the operation of the
Project, 0.00 kg of metals, 1,200 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 |
3
times |
|
· Landscape &
Visual Inspections |
3
times |
Monthly joint environmental site inspections were
carried out. The environmental control/ mitigation measures (related to
air quality, water quality, waste (including land contamination prevention),
hazard-to-life and landscape and visual) recommended in the approved EIA Report
and the EM&A Manual were properly implemented by the Contractor during the
reporting month.
Environmental
Exceedance/Non-conformance/Compliant/Summons and Prosecution
Exceedances
for the air emission limits for the CAPCS, CHP and ASP stacks were recorded
during the reporting period.
No
complaint/ summon/prosecution was received in this reporting period.
Future
Key Issues
Activities
to be undertaken in the next reporting month include:
·
Operation of the Project.
·
Modification of the ASP to control the air emission.
1
inTroduction
ERM-Hong
Kong, Limited (ERM) was appointed by OSCAR Bioenergy Joint Venture (the
Contractor) as the Environmental Team (ET) to undertake the construction
Environmental Monitoring and Audit (EM&A) programme for the Contract
No. EP/SP/61/10 of Organic Waste Treatment Facilities Phase I, which
the project name has been updated to Organic Resources Recovery Centre
(Phase I) (the Project) since November
2017. ERM was also appointed by the Contractor to undertake the
operation EM&A programme starting 1 March 2019.
1.1
Purpose of the Report
This is the 21st
Quarterly EM&A report which summarises the monitoring results and audit
findings for the EM&A programme during the reporting period from 1 June
2020 to 31 August 2020.
1.2
Structure of the Report
The structure of
the report is as follows:
Section
1: Introduction
It details the scope and structure
of the report.
Section
2: Project Information
It
summarises the background and scope of the Project, site description, project
organisation and status of the Environmental Permits (EP)/licences.
Section
3: Environmental Monitoring and Audit Requirements
It
summarises the environmental monitoring requirements including monitoring
parameters, programmes, methodologies, frequency, locations, Action and Limit
Levels, Event/Action Plans, as well as environmental audit requirements as
recommended in the EM&A Manual and approved EIA report.
Section
4: Monitoring Results
It
summarises monitoring results of the reporting period.
Section
5: Site Audit
It
summarises the audit findings of the environmental as well as landscape and
visual site audits undertaken within the reporting period.
Section
6: Environmental Non-conformance
It
summarises any exceedance of environmental performance standard, environmental
complaints and summons received within the reporting period.
Section
7: Further Key Issues
It
summarises the impact forecast for the next reporting month.
Section
8: Conclusions
2
Project information
2.1
Background
The Organic
Resources Recovery Centre (ORRC) Phase I development (hereinafter referred to
as “the Project”) is to design, construct and operate a biological treatment
facility with a capacity of about 200 tonnes per day and convert
source-separated organic waste from commercial and industrial sectors (mostly
food waste) into compost and biogas through proven biological treatment
technologies. The location of the Project site is shown in Annex A.
The
environmental acceptability of the construction and operation of the Project
had been confirmed by findings of the associated Environmental Impact
Assessment (EIA) Study completed in 2009. The Director of Environmental
Protection (DEP) approved this EIA Report under the Environmental Impact
Assessment Ordinance (EIAO) (Cap. 499) in February 2010 (Register No.: AEIAR-149/2010) (hereafter referred to as the approved EIA Report).
Subsequent Report on Re-assessment on Environmental Implications and Report on
Re-assessment on Hazard to Life Implications were completed in 2013,
respectively.
An
Environmental Permit (EP) (No. EP-395/2010) was issued by
the DEP to the EPD (Project Team), the Permit Holder, on 21 June 2010 and
varied on 18 March 2013 (No. EP-395/2010/A) and 21 May 2013 (No.
EP-395/2010/B), respectively. The Design Build and Operate Contract for
the ORRC Phase 1 (Contract No. EP/SP/61/10 Organic Resources Recovery Centre
(Phase 1) (the Contract)) was awarded to SITA Waste Services Limited, ATAL
Engineering Limited and Ros-Roca, Sociedad Anonima jointly trading as the OSCAR
Bioenergy Joint Venture (OSCAR or the Contractor). A Further EP (No.
FEP-01/395/2010/B) was issued by the DEP to the OSCAR on 16 February
2015. Variation to both EPs (Nos. EP-395/2010/B and FEP-01/395/2010/B)
were made in December 2015. The latest EPs, Nos. EP-395/2010/C and FEP-01/395/2010/C,
were issued by the DEP on 21 December 2015.
Under
the requirements of Condition 5 of the EP (No. FEP-01/395/2010/C), an
Environmental Monitoring and Audit (EM&A) programme as set out in the
approved EM&A Manual (hereinafter referred to as EM&A Manual) is required
to be implemented during the construction and operation of the Project.
ERM-Hong Kong, Ltd (ERM) has been appointed by OSCAR as the Environmental Team
(ET) for the construction phase EM&A programme and the Monitoring Team (MT)
for the operation phase EM&A programme for the implementation of the
EM&A programme in
accordance with the requirements of the EP and the approved EM&A Manual.
The
construction works commenced on 21 May 2015. The operation phase of the
EM&A programme commenced on 1 March 2019 ([1]).
The construction phase EM&A programme was completed in the end of
February 2020.
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.
Table 2.1
Summary of Activities Undertaken in the Reporting Period
|
Activities Undertaken in the Reporting Period |
|
·
Systems being operated – waste reception, pre-treatment, CAPCS extraction,
the digesters, the centrifuge, , the composting tunnels the desulphurisation,
the emergency flare, the CHPs, the ASP and the biological waste water
treatment plant (about 100-130 t/d SSOW input); and ·
Process fine-tune – adjustment of the ASP operational parameters with new
treatment media, CEMS/SCADA modification and improvement work following
equipment failures and the alteration of different operation modes and
measures to adapt to the high variation of SSOW nature and sources. |
2.4
Project Organisation and Management Structure
The project
organisation chart and contact details are shown in Annex B.
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-RW0538-18 (Superseded CNP GW-RW0229-18) |
21 January 2019-20 July 2019 |
Approved
on 31 December 2018 |
|
Chemical Waste Producer
Registration |
WPN 5213-961-O2231-01 |
Throughout the Contract |
Approved on 29 April 2015 |
|
Chemical
Waste Producer Registration |
WPN
5213-961-O2231-02 |
Throughout
the implementation of the Project |
Approved
on 10 November 2017 |
|
Waste Disposal Billing Account |
Account number: 702310 |
Throughout the Contract |
- |
3
Environmental Monitoring and Audit Requirements
3.1
Environmental Monitoring
The air quality
(including odour) monitoring to be carried out during the commissioning and
operation phase of the Project are described below. Although water
quality monitoring is not required for the operation phase under the EM&A
programme, there are water quality monitoring requirement under the Water
Discharge Licence of the plant under the Water Pollution Control Ordinance
(WPCO). As part of this EM&A programme, the monitoring results will
be reviewed to check the compliance with the WPCO requirements.
3.1.1
Air Quality
According to the
EM&A Manual and EP requirements, stack monitoring are required during the
commissioning and operation phase of the Project.
On-line
monitoring (using continuous environmental monitoring system (CEMS) shall be
carried out for the centralised air pollution unit (CAPCS), cogeneration units
(CHP) and the ammonia stripping plant (ASP) during the commissioning and
operation phase. The calibration certificate for the on-line monitoring
equipment is provided in Annex C.
The monitoring
data is transmitted instantaneously to EPD (Regional Office) by telemetry
system.
When the on-line
monitoring for certain parameter cannot be undertaken, monitoring will be
carried out using the following methodology approved by the EPD.
Table
3.1
Sampling and Laboratory Analysis Methodology
|
Parameters |
Method |
Stacks to be Monitored |
|
Gaseous and vaporous organic substances (including
methane) |
USEPA Method 18 |
· CAPCS · CHP · ASP |
|
Particulate |
USEPA Method 5 |
· CAPCS · CHP · ASP |
|
Carbon monoxide (CO) |
USEPA Method 10 |
· CHP · ASP |
|
Nitrogen oxides (NOx) |
USEPA Method 7E |
· CHP · ASP |
|
Sulphur dioxide (SO2); |
USEPA Method 6 |
· CHP · ASP |
|
Hydrogen chloride (HCl) |
USEPA Method 26A |
· CHP · ASP |
|
Hydrogen fluoride (HF) |
USEPA Method 26A |
· CHP · ASP |
|
Oxygen (O2); |
USEPA Method 3A |
· CAPCS · CHP · ASP |
|
Velocity and Volumetric Flow |
USEPA Method 2 |
· CAPCS · CHP · ASP |
|
Ammonia (NH3) |
USEPA
CTM 027 |
· ASP |
|
Odour (including NH3 and H2S) |
EN
13725 |
· CAPCS |
|
Water vapour content (continuous measurement of the
water vapour content should not be required if the sample exhaust gas is
dried before the emissions are analysed) |
USEPA
Method 4 |
· CAPCS · CHP · ASP |
|
Temperature |
USEPA
Method 4 |
· CAPCS · CHP · ASP |
With reference
to the EM&A Manual, the air emission of the stacks shall meet the following
emission limits as presented in Tables 3.2 to 3.5.
Table 3.2
Emission Limit for CAPCS Stack
|
Parameter |
Emission Level (mg/Nm3) (a) |
|
VOCs (including
methane) |
680 |
|
Dust (or Total
Suspended Particulates (TSP)) |
6 |
|
Odour (including NH3 & H2S) |
220 (b) |
|
Notes: (a) Hourly
average concentration (b) The odour
unit is OU/Nm3 |
|
Table
3.3
Emission Limit for CHP Stack
|
Parameter |
Maximum Emission Level (mg/Nm3) (a)
(b) |
|
Dust (or Total Suspended Particulates) |
15 |
|
Carbon Monoxide |
650 |
|
NOx |
300 |
|
SO2 |
50 |
|
NMVOCs (c) |
150 |
|
VOCs (including methane) (d) |
1,500 |
|
HCl |
10 |
|
HF |
1 |
|
Notes: (a) All values refer to an
oxygen content in the exhaust gas of 6% and dry basis. (b) Hourly average
concentration (c) NMVOCs should be
monitored by gas sampling and laboratory analysis at an agreed
interval. For the first 12 months (starting from August 2019),
monitoring should be carried out at quarterly intervals. The monitoring
frequency should then be reduced to half-yearly for next 12 months (starting
from August 2020). (d) The VOCs emission limit
include methane as biogas is adopted as fuel in the combustion process. |
|
Table 3.4
Emission Limit for ASP Stack
|
Parameter |
Maximum Emission Level
(mg/Nm3) (a) (b) |
|
Dust (or Total
Suspended Particulates) |
5 |
|
Carbon Monoxide |
100 |
|
NOx |
200 |
|
SO2 |
50 |
|
VOCs (including methane) (c) |
20 |
|
NH3 |
35 |
|
HCl |
10 |
|
HF |
1 |
|
Notes: (a) All values refer
to an oxygen content in the exhaust gas of 11% and dry basis. (b) Hourly average
concentration (c) The VOCs emission limit include methane as biogas is
adopted as fuel in the combustion process. |
|
Table
3.5 Emission Limit for Standby
Flaring Gas Unit ([2])
|
Parameter |
Maximum Emission level (mg/Nm3) (a)
(b) |
|
Dust (or Total Suspended Particulates) |
5 |
|
Carbon Monoxide |
100 |
|
NOx |
200 |
|
SO2 |
50 |
|
VOCs (including methane) (c) |
20 |
|
HCl |
10 |
|
HF |
1 |
|
Notes: (a) All values refer to an oxygen
content in the exhaust gas of 11% and dry basis. (b) Hourly average concentration (c) The VOCs emission limit
include methane as biogas is adopted as fuel in the combustion process. |
|
3.1.2
Odour
To
determine the effectiveness of the proposed odour mitigation measures and to
ensure that the operation of the ORRC1 will not cause adverse odour impacts,
odour monitoring of the CAPCS stack (see Section 3.1.1) and odour patrol
will be carried out.
Odour patrol
shall be conducted by independent trained personnel/ competent persons in
summer months (i.e. from July to September) for the first two operational years
of ORRC1 at monthly intervals along an odour patrol route at the Project Site
boundary as shown in Annex
A.
The perceived
odour intensity is divided into 5 levels. Table 3.6 describes the
odour intensity for different levels.
Table 3.6
Odour Intensity Level
|
Level |
Odour Intensity |
|
0 |
Not detected.
No odour perceived or an odour
so weak that it cannot be easily
characterised or described |
|
1 |
Slight identifiable odour, and slight chance
to have odour nuisance |
|
2 |
Moderate identifiable
odour, and moderate chance to have odour nuisance |
|
3 |
Strong identifiable, likely to have odour nuisance |
|
4 |
Extreme severe odour,
and unacceptable odour level |
Table 3.7 shows
the action level and limit level to be used for odour patrol. Should any
exceedance of the action and limit levels occurs, actions in accordance with
the event and action plan in Table 3.8 should be carried out.
Table 3.7
Action and Limit Levels for Odour Nuisance
|
Parameter |
Action Level |
Limit Level |
|
Odour Nuisance (from odour patrol) |
When one documented compliant is received (a),
or Odour Intensity of 2 is measured
from odour patrol. |
Two or
more documented complaints
are received (a) within a week; or Odour intensity of 3 or above is measured
from odour patrol. |
|
Note: (a)
Once the complaint is received by the Project Proponent (EPD), the Project
Proponent would investigate and verify the complaint whether it is related to
the potential odour emission from the ORRC1 and its on-site wastewater
treatment unit. |
||
Table 3.8
Event and Action Plan for Odour Monitoring
|
Event |
Action |
|
|
|
Person-in-charge of
Odour Monitoring |
Project Proponent
(a) |
|
Action Level |
|
|
|
Exceedance of action level (Odour Patrol) |
1. Identify source/reason of exceedance; 2. Repeat odour patrol to confirm finding. |
1. Carry out investigation to identify the
source/reason of exceedance. Investigation should be completed
within 2 weeks; 2. Rectify any unacceptable practice; 3. Implement more mitigation measures if necessary; 4. Inform Drainage Services Department (DSD) or the
operator of the Siu Ho Wan Sewage Treatment Works (SHWSTW) if exceedance is
considered to be caused by the operation of the SHWSTW. 5. Inform North Lantau Refuse Transfer Station
(NLTS) operator if exceedance is considered to be caused by the operation of
NLTS. |
|
Exceedance of action level (Odour Complaints) |
1. Identify source/reason of exceedance; 2. Carry out odour patrol to determinate odour
intensity. |
1. Carry out investigation and verify the complaint
whether it is related to potential odour emission from the nearby SHWSTW; 2. Carry out investigation to identify the
source/reason of exceedance. Investigation should be completed within
2 weeks; 3. Rectify any unacceptable practice; 4. Implement more mitigation measures if necessary; 5. Inform DSD or the operator of the SHWSTW if
exceedance is considered to be caused by the operation of the SHWSTW. 6. Inform NLTS operator if exceedance is considered
to be caused by the operation of NLTS. |
|
Limit Level |
|
|
|
Exceedance of limit level |
1. Identify source/reason of exceedance; 2. Inform EPD; 3. Repeat odour patrol to confirm findings; 4. Increase odour patrol frequency to bi-weekly; 5. Assess effectiveness of remedial action and keep
EPD informed of the results; 6. If exceedance stops, cease additional odour
patrol. |
1. Carry out investigation to identify the
source/reason of exceedance. Investigation should be completed within
2 week; 2. Rectify any unacceptable practice; 3. Formulate remedial actions; 4. Ensure remedial actions properly implemented; 5. If exceedance continues, consider what
more/enhanced mitigation measures should be implemented; 6. Inform DSD or the operator of the SHWSTW if
exceedance is considered to be caused by the operation of the SHWSTW. |
|
Note: (a) Project
Proponent shall identify an implementation agent. |
||
3.2
Site Audit
Environmental
mitigation measures (related to air quality, water quality, waste, land
contamination, hazard-to-life, and landscape and visual) to be implemented
during the operation phase of the Project are recommended in the approved EIA
Report and EM&A Manual and are summarised in Annex D.
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.
For operation
phase, site inspection shall be conducted once a month for the first year of
operation of the Project. All measures as stated in the implementation
schedule of the EM&A Manual (see Annex D), including compensatory planting, undertaken
by both the Contractor and the specialist Landscape Sub-Contractor during the
first year of the operation phase shall be audited by a Registered Landscape
Architect (RLA) to ensure compliance with the intended aims of the measures and
the effectiveness of the mitigation measures.
4
Monitoring Results
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) |
0 – 15 |
680 |
Nil |
Nil |
|
Dust (or TSP) |
0.2 – 5.9 |
6 |
Nil |
Nil |
|
Odour (including NH3 & H2S) (b) |
0 – 376 |
220 |
Identified (b) |
System Maintenance |
|
Notes: (a) The odour
unit is OU/Nm3. (b) 2
exceedances on Odour (including NH3 & H2S) were
identified on 19 July 2020. |
||||
Table 4.2
Hourly Average of Parameters Recorded for CHP 1
|
Parameter |
Range of Hourly Average Conc. (mg/Nm3)
(a) |
Max. Emission Limit (mg/Nm3) |
Exceedance Identified |
Remarks |
|
Dust (or TSP) |
0 – 6 |
15 |
Nil |
Nil |
|
Carbon Monoxide |
0 – 426 |
650 |
Nil |
Nil |
|
NOx |
0 – 352 |
300 |
Identified (d) |
Low biogas loading resulting in low CHP efficiency.
Supplier had been arranged to fine-tune the equipment. Close monitoring
of the biogas loading is performed to prevent further exceedance. |
|
SO2 |
0 – 56 |
50 |
Identified (e) |
Tripping of desulphurisation unit |
|
NMVOCs (b) |
Nil |
150 |
Nil |
Nil |
|
VOCs (including methane) (c) |
0 – 989 |
1,500 |
Nil |
Nil |
|
HCl |
0 – 3 |
10 |
Nil |
Nil |
|
HF |
0.0 – 0.9 |
1 |
Nil |
Nil |
|
Notes: (a) All values refer to an oxygen content in the exhaust gas of 6% and
dry basis. (b) No sampling was undertaken at CHP 1 as biogas production
rate could not sustain the operation of the CHP stack for the scheduled
sampling on 14 August 2020. (c) The VOCs emission limit
include methane as biogas is adopted as fuel in the combustion process. (d) Dates with exceedances on SO2
(number of exceedances on the day) were identified on 17 (1) and 18 (6) June
2020. (e) 1 exceedance on NOx
was identified on 15 July 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 – 11 |
15 |
Nil |
Nil |
|
Carbon Monoxide |
0 – 206 |
650 |
Nil |
Nil |
|
NOx |
0 – 433 |
300 |
Identified (d) |
Low biogas loading resulting in low CHP efficiency.
Supplier had been arranged to fine-tune the equipment. Close monitoring
of the biogas loading is performed to prevent further exceedance. |
|
SO2 |
0 – 61 |
50 |
Identified (e) |
Tripping of desulphurisation unit |
|
NMVOCs (b) |
2.7 |
150 |
Nil |
See Annex
E for final results |
|
VOCs (including methane)
(c) |
0 – 941 |
1,500 |
Nil |
Nil |
|
HCl |
0 – 3 |
10 |
Nil |
Nil |
|
HF |
0 – 0.8 |
1 |
Nil |
Nil |
|
Notes: (a) All values refer to an oxygen content in the exhaust gas of 6% and
dry basis. (b) Bi-annual sampling of NMVOCs was conducted in CHP 2
on 14 August 2020. (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 5 (1), 16 (3), 17 (13), 26 (2), 27
(3), 28 (9), 29 (12), 30 (3) and 31 (3) July 2020 and 3 (2), 4 (15), 5 (8), 6
(7), 7 (18), 8 (19), 9 (22), 10 (22), 11 (23), 12 (8) and 16 (7) August 2020. (e) Dates with exceedances on SO2 (number of
exceedances on the day) were identified on 17 (1) and 18 (6) June 2020 and 2
(2) July 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 – 5 |
15 |
Nil |
Nil |
|
Carbon Monoxide |
0 – 573 |
650 |
Nil |
Nil |
|
NOx |
0 – 536 |
300 |
Identified (d) |
Low biogas loading resulting in low CHP efficiency.
Supplier had been arranged to fine-tune the equipment. Close monitoring
of the biogas loading is performed to prevent further exceedance. |
|
SO2 |
0 – 47 |
50 |
Nil |
Nil |
|
NMVOCs (b) |
Nil |
150 |
Nil |
Nil |
|
VOCs (including methane) (c) |
0 – 1,254 |
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) Sampling was conducted on 11 February 2020. (c) The VOCs emission limit include methane as biogas is
adopted as fuel in the combustion process. (d) Dates with exceedances on NOx
(number of exceedances on the day) were identified on 4 (2), 5 (4), 6 (11), 7
(13), 8 (13), 9 (10), 13 (4), 14 (6) and 15 (8) June 2020 and 23 (5) and 24
(1) July 2020. |
||||
Table 4.5
Hourly Average of Parameters Recorded for ASP
|
Parameter |
Range of Hourly Average Conc.
(mg/Nm3) (a) |
Max. Emission Limit (mg/Nm3) |
Exceedances Identified |
Remarks |
|
Dust (or TSP) |
0.0 – 4.6 |
5 |
Nil |
Nil |
|
Carbon Monoxide |
0 – 956 |
100 |
Identified (c) |
System instability due to unstable column
temperature. System maintenance were performed to maintain operation
efficiency |
|
NOx |
0 – 603 |
200 |
Identified (d) |
System instability due to unstable column
temperature. System maintenance were performed to maintain operation
efficiency |
|
SO2 |
0 –113 |
50 |
Identified (e) |
System instability due to unstable column
temperature. System maintenance were performed to maintain operation
efficiency |
|
VOCs (including methane) (b) |
0 – 2,147 |
20 |
Identified (f) |
System instability due to unstable column
temperature. System maintenance were performed to maintain operation
efficiency |
|
NH3 |
0 – 209 |
35 |
Identified (g) |
System instability due to unstable column
temperature. System maintenance were performed to maintain operation
efficiency |
|
HCl |
0 – 11 |
10 |
Identified (h) |
System instability due to unstable column
temperature. System maintenance were performed to maintain operation
efficiency |
|
HF |
0 – 2 |
1 |
Identified (i) |
System instability due to unstable column
temperature. System maintenance were performed to maintain operation
efficiency |
|
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
Carbon Monoxide (number of exceedances on the day) were identified on 22 (1)
and 23 (1) June 2020 and 3 (1), 6 (3), 9 (1), 10 (8), and 18 (1) July 2020. (d) Dates with exceedances on NOx (number of
exceedances on the day) were identified on 2 (3), 3 (3), 6 (3), 7 (1), 9 (5),
15 (4), 21 (3), 23 (2), 25 (1) and 28 (1) June 2020, 3 (1), 6 (1), 9 (2), 10
(6), 16 (1), 17 (1), 18 (1), 19 (6), 20 (5), 21 (8) and 22 (1) July 2020 and
2 (8), 3 (8), 5 (5), 8 (2), 10 (3), 19 (1), 25 (2), 28 (1) and 31 (2) August
2020. (e) 1 exceedance on SO2 was identified on 6
July 2020. (f) Dates with exceedances on VOCs (including methane)
(number of exceedances on the day) were identified on 2 (1), 17 (1), 22 (1),
23 (1) and 27 (1) June 2020 and 3 (1), 6 (4), 9 (2), 10 (8), 16 (3), 17 (7),
18 (5), 19 (9) and 20 (5) July 2020. (g) Dates with exceedances on NH3 (number of
exceedances on the day) were identified on 12 (14), 17 (2), 22 (10), 23 (11),
24 (8), 25 (5), 26 (19), 27 (10), 28 (1) and 30 (1) June 2020, 2 (2), 3 (6),
5 (6), 6 (13), 7 (2), 8 (8), 9 (11), 10 (15), 11 (4), 14 (3), 15 (6), 16 (1),
17 (2), 18 (8), 19 (20), 20 (18), 21 (10), 22 (6), 23 (8), 26 (6), 27 (4), 30
(3) and 31 (6) July 2020 and 3 (1), 5 (6), 6 (3), 7 (3), 8 (7), 10 (5), 13
(1), 19 (2), 21 (1), 24 (1), 25 (5), 28 (1) and 31 (4) August 2020. (h) 1 exceedance on HCl was identified on 6 July 2020 (i) Dates with exceedances on HF (number of exceedances
on the day) were identified on 6 (1), 10 (2), 16 (1), 17 (4) and 19 (1) July
2020. |
||||
4.2
Odour
4.2.1
Operation Phase Monitoring
June 2020
No odour patrol
was required to be conducted for this reporting period.
July 2020
Odour patrol was
conducted by the independent odour patrol team of ALS Technichem (HK) Pty Ltd
on 3 July 2020. According to the EM&A Manual and EP requirements, it
is considered an exceedance if the odour intensity recorded by the panellists
is Level 2 or above. During this reporting period, no Level 2 Odour
Intensity was recorded. The odour patrol result is shown in Annex I.
August 2020
Odour patrol was
conducted by the independent odour patrol team of ALS Technichem (HK) Pty Ltd
on 14 August 2020. According to the EM&A Manual and EP requirements,
it is considered an exceedance if the odour intensity recorded by the
panellists is Level 2 or above. During this reporting period, no Level 2
Odour Intensity was recorded. The odour patrol result is shown in Annex I.
4.3
Water Quality
4.3.1
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 to 4.8.
Table 4.6
Results of the Discharge Sample Collected on 2 June 2020
|
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
|
pH (pH units) |
6.73 – 7.53 |
6-10 (a) |
Yes |
|
Suspended Solids |
78 |
800 |
Yes |
|
Biochemical Oxygen Demand (5 days, 20°) |
40 |
800 |
Yes |
|
Chemical Oxygen Demand |
599 |
2,000 |
Yes |
|
Oil & Grease |
<5 |
40 |
Yes |
|
Total Nitrogen |
66.3 |
200 |
Yes |
|
Total Phosphorus |
26.9 |
50 |
Yes |
|
Surfactants (total) |
<1.0 |
25 |
Yes |
|
Notes: (a) Daily Average. |
|||
Table 4.7
Results of the Discharge Sample Collected on 7 July 2020
|
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
|
pH (pH units) |
6.83 – 7.95 |
6-10 (a) |
Yes |
|
Suspended Solids |
24 |
800 |
Yes |
|
Biochemical Oxygen Demand (5 days, 20°) |
12 |
800 |
Yes |
|
Chemical Oxygen Demand |
381 |
2,000 |
Yes |
|
Oil & Grease |
<5 |
40 |
Yes |
|
Total Nitrogen |
122 |
200 |
Yes |
|
Total Phosphorus |
26.3 |
50 |
Yes |
|
Surfactants (total) |
<1.0 |
25 |
Yes |
|
Notes: (a) Daily Average. |
|||
Table 4.8
Results of the Discharge Sample Collected on 6 August 2020
|
Parameters |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
|
pH (pH units) |
6.77 - 7.49 |
6-10 (a) |
Yes |
|
Suspended Solids |
241 |
800 |
Yes |
|
Biochemical Oxygen Demand (5 days, 20°) |
63 |
800 |
Yes |
|
Chemical Oxygen Demand |
653 |
2,000 |
Yes |
|
Oil & Grease |
11 |
40 |
Yes |
|
Total Nitrogen |
165 |
200 |
Yes |
|
Total Phosphorus |
34.8 |
50 |
Yes |
|
Surfactants (total) |
<1.0 |
25 |
Yes |
|
Notes: (a) Daily Average. |
|||
No exceedance of discharge limit
was recorded during the reporting period.
4.4
Waste Management
4.4.1
Operation Phase Monitoring
Wastes generated
from the operation of the Project include chemical waste, wastes generated from
pre-treatment process and general refuse ([3]).
Reference has been made to the Monthly Summary Waste Flow Table prepared by the
Contractor (see Annex
F). With reference to the relevant handling records and trip
tickets of this Project, the quantities of different types of waste generated
from the operation of the Project in the reporting month are summarised in Table
4.9.
Table 4.9
Quantities of Waste Generated from the Operation of the Project
|
Month / Year |
Chemical
Waste |
Waste
Generated from |
General
Refuse |
||
|
|
Disposal
of at CWTC |
Disposed
of at Landfill (a) |
Recycled
(b) |
Disposed
of at Landfill (a) (d) |
Recycled
(c) |
|
June 2020 |
0 L |
347.23 tonnes |
0.00 tonnes |
2.88 tonnes (d) |
0 kg |
|
July 2020 |
200 L |
852.07 tonnes |
0.00 tonnes |
3.00 tonnes (d) |
0 kg |
|
August 2020 |
0 L |
700.25 tonnes |
0.00 tonnes |
2.88 tonnes (d) |
1,200 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, 1,200 kg of papers/ cardboard packing and
0 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
Operation Phase
The monthly inspections of the landscape and visual mitigation measures
for the operation phase of the Project covered the operation phase
environmental site inspections. The inspections checked the
implementation of the recommended mitigation measures for air quality,
landscape and visual, water quality, waste (land contamination) and
hazard-to-life stated in the Implementation Schedule (see Annex D).
Follow-up actions resulting from the site inspections were generally
taken as reported by the Contractor. The Contractor has implemented
environmental mitigation measures recommended in the approved EIA Report and
EM&A Manual.
June 2020
The monthly inspection of the landscape and visual mitigation measures
for the operation phase of the Project on 29 June 2020 covered the operation
phase environmental site audit. Joint site inspections was conducted by
representatives of the Contractor, ER, IEC and the MT on 29 June 2020 as
required for the operation of the Project.
July 2020
The monthly inspection of the landscape and visual mitigation measures
for the operation phase of the Project on 31 July 2020 covered the operation
phase environmental site audit. Joint site inspections was conducted by
representatives of the Contractor, ER, IEC and the MT on 31 July 2020 as
required for the operation of the Project.
August 2020
The monthly inspection of the landscape and visual mitigation measures
for the operation phase of the Project on 24 August 2020 covered the operation
phase environmental site audit. Joint site inspections was conducted by
representatives of the Contractor, IEC and the MT on 24 August 2020 as required
for the operation of the Project.
5.2
Landscape and Visual Audit
It was confirmed
that the necessary landscape and visual mitigation measures during the
operation phase as summarised in Annex D were generally implemented by the
Contractor. No non-compliance in relation to the landscape and visual
mitigation measures was identified during the site audits in this reporting
period and therefore no further actions are required. The ET/MT will keep
track of the EM&A programme to check compliance with environmental
requirements and the proper implementation of all necessary mitigation
measures.
June 2020
Inspection of the landscape and visual mitigation measures for the
operation phase of the Project was performed on 29 June 2020.
July 2020
Inspection of the landscape and visual mitigation measures for the
operation phase of the Project was performed on 31 July 2020.
August 2020
Inspection of the landscape and visual mitigation measures for the
operation phase of the Project was performed on 24 August 2020.
6
Environmental Non-conformance
6.1
Summary of Environmental Non-Compliance
June 2020
Non-compliance
of emission limits for CHP and ASP were recorded during the reporting period.
The Contractor
has reviewed the organic waste treatment processes (i.e. waste reception, waste
pre-treatment, anaerobic digesters, and composting processes) and found that
they were operated normally during the reporting period. The Contractor
has investigated air pollution control systems for the CHP and ASP and
identified several potential causes for the exceedance. Remedial and
follow-up actions had been recommended to the Contractor to perform
accordingly. The Investigation Report is show in Annex H.
July 2020
Non-compliance
of emission limits for CAPCS, CHP and ASP were recorded during the reporting
period.
The Contractor
has reviewed the organic waste treatment processes (i.e. waste reception, waste
pre-treatment, anaerobic digesters, and composting processes) and found that
they were operated normally during the reporting period. The Contractor
has investigated air pollution control systems for the CAPCS, CHP and ASP and
identified several potential causes for the exceedance. Remedial and
follow-up actions had been recommended to the Contractor to perform
accordingly. The Investigation Report is show in Annex H.
August 2020
Non-compliance
of emission limits for CHP and ASP were recorded during the reporting
period.
The Contractor
has reviewed the organic waste treatment processes (i.e. waste reception, waste
pre-treatment, anaerobic digesters, and composting processes) and found that
they were operated normally during the reporting period. The Contractor
has investigated air pollution control systems for the CHP and the ASP and
identified several potential causes for the exceedance. Remedial and
follow-up actions had been recommended to the Contractor to perform
accordingly. The Investigation Report is show in Annex H.
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 G.
7
Future Key Issues
7.1
Key Issues for the Coming Reporting Period
Activities to be
undertaken for the coming reporting period are:
·
Operation of the Project.
·
Modification of the ASP to control the air emission.
8
Conclusions
This EM&A Report presents the
EM&A programme undertaken during the reporting period from 1 June 2020
to 31 August 2020 in accordance with EM&A Manual (Version F) and
requirements of EP (FEP-01/395/2010/C).
For the operation phase,
exceedances of the emission limits for stack monitoring (including CAPCS, CHP
and ASP stacks) were recorded under normal operating conditions during the
reporting period (see Table 8.1).
Table
8.1 Exceedances for Stack Emissions
|
Stack |
Exceedances During the Reporting Period |
|
Centralised Air Pollution Control Unit (CAPCS) |
Exceeded emission limit of Odour (including NH3
& H2S) on 19 July 2020 |
|
Cogeneration Unit (CHP) |
· Exceeded
emission limit of NOx on 4, 5, 6, 7, 8, 9, 13, 14 and 15 June
2020, 5, 15, 16, 17, 23, 24, 26, 27, 28, 29, 30 and 31 July 2020 and 3, 4, 5,
6, 7, 8, 9, 10, 11, 12 and 16 August 2020 · Exceeded
emission limit of SO2 on 17 and 18 June 2020 and 2 July 2020 |
|
Ammonia Stripping Plant (ASP) |
· Exceeded
emission limit on Carbon Monoxide on 22 and 23 June 2020 and 3, 6, 9, 10, 18
and 22 July 2020 · Exceeded
emission limit of NOx on 2, 3, 6, 7, 9, 15, 21, 23, 25 and 28 June
2020, 3, 6, 9, 10, 16, 17, 18, 19, 20, 21 and 22 July 2020 and 2, 3, 5, 8,
10, 19, 25, 28 and 31 August 2020 · Exceeded
emission limit of SO2 on 6 July 2020 · Exceeded
emission limit of VOCs (including methane) on 2, 17, 22, 23 and 27 June 2020
and 3, 6, 9, 10, 16, 17, 18, 19 and 20 July 2020 · Exceeded
emission limit of NH3 on 12, 17, 22, 23, 24, 25, 26, 27, 28 and 30
June 2020, 2, 3, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22,
23, 26, 27, 30 and 21 July 2020 and 3, 5, 6, 7, 8, 10, 13, 19, 21, 24, 25, 28
and 31 August 2020 · Exceeded
emission limit of HCl on 6 July 2020 · Exceeded
emission limit of HF on 6, 10, 16, 17 and 19 July 2020 |
Exceedances in emission parameters
of CAPCS, CHP and ASP were found to be results of system maintenance at CAPCS,
low biogas loading at CHP and incomplete combustion of biogas at ASP.
The Contractor has implemented
mitigation measures to control the exceedance including the continuous
monitoring of CAPCS, CHP and ASP to optimise overall performance.
Odour patrols were conducted in
accordance to the EM&A requirements. No exceedance of odour intensity
limit for the odour patrols.
No non-compliance to the effluent
discharge limit was recorded during this reporting period.
The environmental control
/mitigation measures related to air quality, water quality, waste (including
land contamination prevention), hazard-to-life and landscape and visual
recommended in the approved EIA Report and the EM&A Manual were properly
implemented by the Contractor during the reporting period.
Monthly landscape and visual
monitoring were conducted in the reporting period. The necessary
landscape and visual mitigation measures recommended in the approved EIA Report
were generally implemented by the Contractor.
No complaint/summon/prosecution was
received.
([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.