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 33rd Quarterly EM&A report which summarises
the monitoring results and audit findings for the EM&A programme during the
reporting period from 1 June 2023 to 31 August 2023.
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 ().
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 an average of 146.4 to 158.4 tonnes and treated an average of
124.6 to 136.56 tonnes of source separated organic waste per day during the
reporting period.
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 wastewater
treatment plant (about 146.4 – 158.4 t/d SSOW input);
·
Heat
Exchanger cleaning for the ASP;
·
QAL 2 for CHPs;
·
CAPCS flexible joint replacement for fan# 3;
·
CAPCS VDF replacement for fan# 2;
·
ASP- Softener repair work;
·
Bio-gas holder 0114 NRV 208 repaired and 0114PS002 checked. The
pressure switch needs more work, but the NRV has been repaired and placed
into production;
·
Bypassed the Heat Exchangers on CHP 1 and 2 due to water leaking into
the heat exchangers;
·
Replaced motor bearings on wet scrubber circulation motor 690M102; and
·
Removed both Leachate Pumps 5080M201 and 101 - both are no longer
pumping.
|
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
|
WT00038391-2021
|
7 July 2021
– 30 June 2026
|
Approved on
7 July 2021
|
|
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 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
is required during the 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
operation phase. The last calibration was carried out from 10 to 12
July 2023; and the last maintenance was carried out from 1 to 4 May 2023.
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
odour, 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
occur, 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; and
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; and
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; and
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 C. 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. Under Effluent Discharge Licence WT00038391-2021
(effective from July 2021), the effluent quality shall meet the discharge
limits as described in Table 3.9 and Table 3.10.
Table 3.9
Discharge Limits for Effluent from the Effluent Storage Tank (as stipulated in
WT00038391-2021)
|
Parameters
|
Discharge Limit
(mg/L)
|
|
Flow Rate (m3/day)
(a)
|
645
|
|
pH (pH units) (b)
|
6-10 (c)
|
|
Suspended Solids
(b)
|
800
|
|
Biochemical Oxygen
Demand (5 days, 20°) (b)
|
800
|
|
Chemical Oxygen Demand
(b)
|
2,000
|
|
Oil & Grease
(b)
|
40
|
|
Total Nitrogen
(b)
|
200
|
|
Total Phosphorus
(b)
|
50
|
|
Surfactants (total)
(b)
|
25
|
|
Notes:
(a) Flow rate is not a parameter required to be
monitored and reported by the Contractor in accordance with Section B2 of the
Effluent Discharge Licence under the WPCO.
(b) Parameters required to be monitored and
reported by the Contractor in accordance with Section B2 of the Effluent
Discharge Licence under the WPCO.
(c) Range.
|
Table 3.10
Discharge Limits for Effluent from the Petrol Interceptor(s) (as stipulated in
TW00038391-2021)
|
Parameters
|
Discharge Limit
(mg/L)
|
|
Flow Rate (m3/day)
(a)
|
245 (a)
|
|
Suspended Solids
(b)
|
30
|
|
Chemical Oxygen Demand
(c)
|
80
|
|
Oil & Grease
(c)
|
20
|
|
Surfactants (total)
(b)
|
15
|
|
Notes:
(a) The surface runoff flow rate limit was
estimated by the overall yearly rainfall data. As the actual flowrate from
the petrol interceptors depends on the weather condition instead of the
performance of the petrol interceptor, monitoring and reporting of this
parameter is not required. Hence this parameter is not reported in Table
4.10 and Table 4.11.
(b) Parameter not required to be reported in accordance
with Section B2 of the Effluent Discharge Licence under the WPCO.
(c) Parameters required to be reported
in accordance with Section B2 of the Effluent Discharge Licence under the
WPCO.
|
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 C), including
compensatory planting, undertaken by both the Contractor and the specialist
Landscape Sub-Contractor during the first year of the operation phase shall be
audited by a Registered Landscape Architect (RLA) to ensure compliance with the
intended aims of the measures and the effectiveness of the mitigation measures.
4
Monitoring Results
4.1
Air Quality
4.1.1
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, the standby flare was not operated, but flare testing was conducted on
24 July 2023, 22 August 2023 and 23 August 2023.
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 and unstable operation, as
well as 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) (a)
|
0.00 – 679.94
|
680
|
Nil
|
Nil
|
|
Dust (or TSP)
|
0.00 – 0.00
|
6
|
Nil
|
Nil
|
|
Odour (including NH3
& H2S) (b)
|
0.00 – 1,528.45
|
220
|
Identified (c)
|
System unstable (e.g.,
low efficiency)
|
|
Note:
(a) The VOCs emission limit includes methane as
biogas is adopted, as fuel in the combustion process.
(b)
The odour unit is
OU/Nm3.
(c)
Dates
with Odour exceedances (number of exceedances on that day) were identified on
1(13), 2(24), 3(20), 4(12), 5(14), 6(20), 7(16), 8(13), 9(2), 10(3), 11(10),
12(17), 13(11), 14(4), 15(3), 16(9), 17(2), 19(2), 20(1), 21(18), 22(1), and
25(2) August 2023.
|
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 - 10
|
15
|
Nil
|
Nil
|
|
Carbon
Monoxide
|
0 - 141
|
650
|
Nil
|
Nil
|
|
NOx
|
0 – 520
|
300
|
Identified
(c)
|
System
unstable (e.g., low efficiency, unstable column temperature)
|
|
SO2
|
0 – 172
|
50
|
Identified (d)
|
System unstable (e.g.,
low efficiency, unstable column temperature)
|
|
VOCs
(including methane) (b)
|
0 – 1,499
|
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) The VOCs emission limit includes methane as
biogas is adopted as fuel in the combustion process.
(c) Dates with NOx
exceedances (number of exceedances on the day) were identified on 2(7), 3(6),
4(9), 5(20), 6(10), 9(12), 11(5), 12(24), 13(16), 19(13), 20(24), 21(24),
22(24), 23(24), 24(24), 25(24), 26(20), 27(21), 28(24), 29(24), and 30(23)
June 2023; 1 (24), 2(24), 3(24), 4(24), 5(23), 6(19), 7(24), 8(24), 9(24),
10(23), 11(15), 12(10), 13(24), 14(24), 15(24), 16(24), 17(13), 18(14),
19(19), 20(11), 21(21), 22(24), 23(24), 24(14), 27(24), 28(24), 29(24),
30(24), and 31(23) July 2023; 1(24), 2(24), 3(24), 4(24), 5(8), 8(10), 9(9),
11(12), 12(24), 13(20), 14(3), 18(10), 19(22), 20(6), 23(4), 24(7), 25(23),
26(10), 27(21), 28(18), 29(15), 30(19), and 31(23) August 2023.
(d) Dates with SO2 exceedances (number
of exceedances on the day) were identified on 2(7), 3(6), 4(9), 5(19), 6(10),
9(12), 11(5), 12(24), 13(16), 19(12), 20(24), 21(23), 22(24), 23(23), 24(22),
25(20), 26(19), 27(17), 28(23), 29(24), and 30(19) June 2023; 1(24), 2(24), 3(24),
4(23), 5(23), 6(18), 7(22), 8(24), 9(24), 10(23), 11(15), 12(10), 13(24),
14(24), 15(24), 16(24), 17(7), 18(1), 21(1), 22(24), 23(24), 24(14), 27(2),
and 31(17) July 2023; 1(24), 2(24), 3(24), 4(24), 5(8), 11(12), 12(24),
13(18), 14(3), 18(10), 19(22), 20(6), 23(3), 24(1), 26(2), 27(16), 28(17),
29(13), 30(19), and 31(22) August 2023.
|
Table 4.3
Hourly Average of Parameters Recorded for CHP 2
|
Parameter
|
Range of Hourly
Average Conc. (mg/Nm3) (a)
|
Max. Emission
Limit (mg/Nm3)
|
Exceedance
Identified
|
Remarks
|
|
Dust (or TSP)
|
0 – 13
|
15
|
Nil
|
Nil
|
|
Carbon Monoxide
|
0 – 195
|
650
|
Nil
|
Nil
|
|
NOx
|
0 – 478
|
300
|
Identified (c)
|
System unstable (e.g.,
low efficiency, unstable column temperature)
|
|
SO2
|
0 – 283
|
50
|
Identified (d)
|
System unstable (e.g.,
low efficiency, unstable column temperature)
|
|
VOCs
(including methane) (b)
|
0 – 1,490
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0 – 82
|
10
|
Identified (e)
|
System unstable (e.g.,
low efficiency, unstable column temperature)
|
|
HF
|
0 – 1
|
1
|
Nil
|
Nil
|
|
Notes:
(a) All values refer to an oxygen content in the exhaust
gas of 6% and
dry basis.
(b) The VOCs emission limit includes methane as
biogas is adopted as fuel in the combustion process.
(c) Dates with NOx exceedances (number
of exceedances on the day) were identified 1(7), 2(1), 3(1), 6(1), 7(7),
8(18), 9(7), 10(10), 11(17), 12(6), 14(18), 15(22), 16(24), 17(22), 18(22),
19(6), 20(1), 21(6), 26(3), and 27(6) June 2023; 1(14), 2(10), 3(4), 5(6),
6(14), 7(5), 8(24), 9(24), 10(21), 11(8), 12(7), 13(16), 14(14), 15(19),
16(9), 17(4), 18(3), 19(3), 20(6), 21(1), 25(1), 27(3), 28(4), and 30(4) July
2023; 1(2), 2(12), 3(10), 4(10), 5(11), 6(6), 7(8), 8(9), 9(11), 10(15),
11(24), 12(19), 13(21), 14(23), 15(22), 16(23), 17(10), 18(3), 19(3), 26(5),
28(2), and 29(8) August 2023.
(d)
Dates with SO2 exceedances (number of exceedance on the day) were identified
on 1(9), 2(2), 3(1), 6(4), 7(1), 8(1), 9(1), 10(2), 11(9), 12(11), 14(8),
15(12), 19(1), 20(18), and 21(13) June 2023; 10(1), 11(11), 12(8), 20(2), 21(1),
24(7), 25(13), 26(10), 27(12), 28(1), and 31(7) July 2023; 1(11), 2(5), 3(1),
4(10), 5(9), 12(11), 13(8), 15(2), 16(9), 17(13), 18(22), and 19(4) August
2023.
(e) Date with HCl exceedance (number of
exceedances on that day) was identified on 17 (2) August 2023.
|
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 – 13
|
15
|
Nil
|
Nil
|
|
Carbon Monoxide
|
0 – 100
|
650
|
Nil
|
Nil
|
|
NOx
|
0 – 690
|
300
|
Identified (c)
|
System unstable (e.g.,
low efficiency, unstable column temperature)
|
|
SO2
|
0 – 304
|
50
|
Identified (d)
|
System unstable (e.g.,
low efficiency, unstable column temperature)
|
|
VOCs
(including methane) (b)
|
0 – 1,495
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0 – 24
|
10
|
Identified (e)
|
System unstable (e.g.,
low efficiency, unstable column temperature)
|
|
HF
|
0 – 1
|
1
|
Nil
|
Nil
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 6% and dry basis.
(b) The VOCs emission
limit includes methane as biogas is adopted as fuel in the combustion
process.
(c) Dates with NOx exceedances (number of exceedances on the day) were identified on 3(12),
4(14), 5(2), 6(1), 7(11), 13(1), 14(6), 15(14), 16(8), 17(17), 18(17),
19(11), 21(7), 22(23), 23(21), 24(24), 25(24), 26(15), 28(18), 29(6), and
30(6) June 2023; 3(2), 4(11), 5(13), 19(5), 20(16), 21(20), 22(24),
23(24), 24(17), 25(22), 26(19), 27(1), 28(1), and 31(2) July 2023; 3(1),
5(12), 6(24), 7(22), 8(13), 9(22), 10(24), 11(10), 14(17), 15(22), 16(15),
17(7), 19(7), 20(24), 21(24), 22(24), 23(15), 24(12), 25(1), 27(1), 28(10),
29(1), 30(14), and 31(4) August 2023.
(d)
Dates with SO2 exceedances (number of exceedance on the day) was identified on
3(12), 4(13), 5(2), 7(6), 14(4), 15(10), 16(3), 17(9), 18(11), 19(5), 22(17),
23(12), 25(1), 26(5), 28(13), 29(4), and 30(4) June 2023; 3(1), 4(4), 5(2),
19(3), 20(7), 21(4), 22(6), 23(9), 24(12), 25(12), 26(8), 27(1), and 31(2)
July 2023; 3(1), 7(1), 8(1), 9(8), 10(1), 14(11), 15(11), 16(5),
17(7), 19(7), 20(12), 22(1), 23(2), 24(1), 28(6), 30(7), and 31(1) August
2023.
(e)
Dates with HCl
exceedances (number of exceedances on the day) were identified on 21(1) and
26(1) July 2023.
|
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 – 3
|
5
|
Nil
|
Nil
|
|
Carbon Monoxide
|
0 – 96
|
100
|
Nil
|
Nil
|
|
NOx
|
0 – 505
|
200
|
Identified (c)
|
System unstable (e.g.,
low efficiency, unstable column temperature)
|
|
SO2
|
0 – 302
|
50
|
Identified (d)
|
System unstable (e.g.,
low efficiency, unstable column temperature)
|
|
VOCs
(including methane) (b)
|
0 – 20
|
20
|
Nil
|
Nil
|
|
NH3
|
0 – 475
|
35
|
Identified
(e)
|
System
unstable (e.g., low efficiency, unstable column temperature)
|
|
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 11% and dry basis.
(b) The VOCs emission limit include methane as
biogas is adopted as fuel in the combustion process.
(c) Dates with NOx exceedances (number of exceedances on the day) were identified on 1(8),
2(14), 3(1), 5(1), 6(1), 7(1),15(1), and 20(1) June 2023; 1(2), 5(1), 6(3),
8(1), 10(1), 11(3), 12(1), 14(3), 16(1), 17(4), 18(4), 19(6), 22(1), 23(2),
24(8), 25(3), 26(4), 27(1), 28(7), 29(3), 30(3), and 31(10) July 2023; 1(9),
2(4), 3(2), 4(6), 5(13), 6(1), 7(8), 8(2), 9(3), 10(2), 13(11), 14(8), 15(5),
16(8), 17(8), 18(1), 19(3), 21(1), 22(1), 23(4), 24(15), 25(13), 26(17),
28(7), 29(20), 30(14), and 31(5) August 2023.
(d) Dates with SO2 exceedances (number
of exceedances on the day) were identified on 2(8) and 3(2) June 2023; 26(1),
28(1), 29(21), and 30(10) July 2023; 1(9), 2(10), 8(2), 9(1), 13(1), 16(6),
17(21), 18(23), 19(14), 22(1), and 31(1) August 2023.
(e) Dates with NH3 exceedances (number
of exceedances on the day) were identified on 3(4), 5(3), 11(3), 12(6),
13(24), 14(24), 15(15), 16(16), 17(5), 18(11), 19(2), 20(23), 21(22), 22(24),
23(20), 24(19), 25(23), 26(17), 27(22), 28(1), 29(6), and 30(4) June 2023;
1(3), 5(5), 6(6), 7(13), 8(19), 9(12), 10(2), 11(11), 12(5), 13(4), 14(2),
15(4), 16(3), 17(4), 18(4), 19(4), 20(16), 21(5), 22(8), 24(1), and 26(2)
July 2023; 3(1), 5(6), 6(2), 7(2), 8(7), 10(3), 12(9), and 13(3) August 2023.
|
Table
4.6 Hourly Average of
Parameters Recorded for the Standby Flaring Gas Unit
|
Parameter
|
Range of Hourly Average Conc. (mg/Nm3) (a)(c)
|
Max. Emission
Limit (mg/Nm3)
|
Exceedances
Identified
|
Remarks (d)
|
|
Dust (or TSP)
|
0 – 0
|
5
|
Nil
|
Nil
|
|
Carbon Monoxide
|
0 – 0
|
100
|
Nil
|
Nil
|
|
NOx
|
0 – 0
|
200
|
Nil
|
Nil
|
|
SO2
|
0 – 0
|
50
|
Nil
|
Nil
|
|
VOCs
(including methane) (b)
|
0 – 0
|
20
|
Nil
|
Nil
|
|
HCl
|
0 – 0
|
10
|
Nil
|
Nil
|
|
HF
|
0 – 0
|
1
|
Nil
|
Nil
|
|
Notes:
(a) All values refer to an oxygen content in the
exhaust gas of 11% and dry basis.
(b) The VOCs emission limit include methane as
biogas is adopted as fuel in the combustion process.
(c) The standby flare did not operate
during the reporting period.
|
4.2.1
Operation
Phase Monitoring
Odour patrol was conducted by the independent odour patrol team of ALS Technichem (HK) Pty Ltd on 10 July 2023 and 2 August 2023.
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 results are shown in Annex G.
4.3
Water
Quality
4.3.1
Operation
Phase Monitoring
Effluent discharge was sampled monthly from the outlet chamber of the
Effluent Storage Tank as stipulated in the operation phase discharge licence.
Discharge from the Petrol Interceptors were sampled bi-monthly since July 2021
as stipulated in the operation phase discharge licence. The results of the
discharge samples from the outlet chamber of the Effluent Storage Tank are
recorded in Table 4.7 to 4.9. The results of the discharge
samples from the Petrol Interceptors are recorded in Table 4.10 to
4.13.
Table 4.7
Results of the Discharge Sample Collected from the Outlet Chamber of the
Effluent Storage Tank in June 2023
|
Parameters
|
Discharged
Effluent Concentration (mg/L)
|
Discharge Limit
(mg/L)
|
Compliance with
Discharge Limit
|
|
Flow Rate (m3/day)
(a)
|
11 – 295
(e)
|
645
|
Yes
|
|
pH (pH units) (b)
|
7.59 –
9.22 (e)
|
6-10 (c)
|
Yes
|
|
Suspended Solids (b)
(d)
|
476 (d)
|
800
|
Yes
|
|
Biochemical Oxygen
Demand (5 days, 20°) (b) (d)
|
26 (d)
|
800
|
Yes
|
|
Chemical Oxygen Demand (b) (d)
|
1960 (d)
|
2,000
|
Yes
|
|
Oil & Grease (b)
(d)
|
<5 (d)
|
40
|
Yes
|
|
Total Nitrogen (b)
(d)
|
567 (d)
|
200
|
No
|
|
Total Phosphorus (b)
(d)
|
62.8 (d)
|
50
|
No
|
|
Surfactants (total)
(b) (d)
|
<1.0 (d)
|
25
|
Yes
|
|
Notes:
(a) Parameter not required to be reported in accordance
with Section B2 of the Effluent Discharge Licence under the WPCO.
(b) Parameters required to be reported in
accordance with Section B2 of the Effluent Discharge Licence under the WPCO.
(c) Daily Range.
(d) Effluent sample collected on 9 June 2023.
(e) Data collected daily in the reporting month.
|
Table 4.8
Results of the Discharge Sample Collected from the Outlet Chamber of the
Effluent Storage Tank in July 2023
|
Parameters
|
Discharged Effluent
Concentration (mg/L)
|
Discharge Limit
(mg/L)
|
Compliance with
Discharge Limit
|
|
Flow Rate (m3/day)
(a)
|
2 – 302 (e)
|
645
|
Yes
|
|
pH (pH units) (b)
|
8.08 – 9.08 (e)
|
6-10 (c)
|
Yes
|
|
Suspended Solids (b)
(d)
|
572 (d)
|
800
|
Yes
|
|
Biochemical Oxygen Demand
(5 days, 20°) (b) (d)
|
29 (d)
|
800
|
Yes
|
|
Chemical Oxygen Demand (b) (d)
|
1570 (d)
|
2,000
|
Yes
|
|
Oil & Grease (b)
(d)
|
<5 (d)
|
40
|
Yes
|
|
Total Nitrogen (b)
(d)
|
528 (d)
|
200
|
No
|
|
Total Phosphorus (b)
(d)
|
68.6 (d)
|
50
|
No
|
|
Surfactants (total)
(b) (d)
|
1.9 (d)
|
25
|
Yes
|
|
Notes:
(a) Parameter not required to be reported in
accordance with Section B2 of the Effluent Discharge Licence under the WPCO.
(b) Parameters required to be reported in
accordance with Section B2 of the Effluent Discharge Licence under the WPCO.
(c) Daily Range.
(d) Effluent sample collected on 31 July 2023.
(e) Data collected daily in the reporting month.
|
Table 4.9
Results of the Discharge Sample Collected from the Outlet Chamber of the
Effluent Storage Tank in August 2023
|
Parameters
|
Discharged
Effluent Concentration (mg/L)
|
Discharge Limit
(mg/L)
|
Compliance with
Discharge Limit
|
|
Flow Rate (m3/day)
(a)
|
22 - 246 (e)
|
645
|
Yes
|
|
pH (pH units) (b)
|
7.75 – 8.58 (e)
|
6-10 (c)
|
Yes
|
|
Suspended Solids (b)
(d)
|
159 (d)
|
800
|
Yes
|
|
Biochemical Oxygen
Demand (5 days, 20°) (b) (d)
|
48 (d)
|
800
|
Yes
|
|
Chemical Oxygen Demand (b) (d)
|
1540 (d)
|
2,000
|
Yes
|
|
Oil & Grease (b)
(d)
|
<5 (d)
|
40
|
Yes
|
|
Total Nitrogen (b)
(d)
|
106 (d)
|
200
|
Yes
|
|
Total Phosphorus (b)
(d)
|
18.2 (d)
|
50
|
Yes
|
|
Surfactants (total)
(b) (d)
|
1.4 (d)
|
25
|
Yes
|
|
Notes:
(a) Parameter not required to be reported in
accordance with Section B2 of the Effluent Discharge Licence under the WPCO.
(b) Parameters required to be reported in
accordance with Section B2 of the Effluent Discharge Licence under the WPCO.
(c) Daily Range.
(d) Effluent sample collected on 22 August 2023.
(e) Data collected daily in the reporting month.
|
Table 4.10
Results of the Discharge Sample from the Petrol Interceptor 1 on 15 June 2023
|
Parameters
|
Discharged Effluent Concentration (mg/L)
|
Discharge Limit (mg/L)
|
Compliance with Discharge Limit
|
|
Suspended
Solids (b)
|
6
(a)
|
30
|
Yes
|
|
Chemical
Oxygen Demand (c)
|
17
(a)
|
80
|
Yes
|
|
Oil
& Grease (c)
|
<5
(a)
|
20
|
Yes
|
|
Surfactants
(total) (b)
|
<1.0
(a)
|
15
|
Yes
|
|
Notes:
(a) Effluent sample collected on 15 June 2023.
(b) Parameter not required to be reported in
accordance with Section B2 of the Effluent Discharge Licence under the WPCO.
(c) Parameters required to be reported
in accordance with Section B2 of the Effluent Discharge Licence under the
WPCO.
|
Table 4.11
Results of the Discharge Sample from the Petrol Interceptor 2 on 15 June 2023
|
Parameters
|
Discharged Effluent Concentration (mg/L)
|
Discharge Limit (mg/L)
|
Compliance with Discharge Limit
|
|
Suspended
Solids (b)
|
7
(a)
|
30
|
Yes
|
|
Chemical
Oxygen Demand (c)
|
35
(a)
|
80
|
Yes
|
|
Oil
& Grease (c)
|
<5
(a)
|
20
|
Yes
|
|
Surfactants
(total) (b)
|
<1.0
(a)
|
15
|
Yes
|
|
Notes:
(a) Effluent sample collected on 15 June 2023.
(b) Parameter not required to be reported in
accordance with Section B2 of the Effluent Discharge Licence under the WPCO.
(c) Parameters required to be reported
in accordance with Section B2 of the Effluent Discharge Licence under the
WPCO.
|
Table
4.12 Results of the Discharge Sample from
the Petrol Interceptor 1 on 24 August 2023
|
Parameters
|
Discharged Effluent Concentration (mg/L)
|
Discharge Limit (mg/L)
|
Compliance with Discharge Limit
|
|
Suspended
Solids (b)
|
22
(a)
|
30
|
Yes
|
|
Chemical
Oxygen Demand (c)
|
47
(a)
|
80
|
Yes
|
|
Oil
& Grease (c)
|
<5
(a)
|
20
|
Yes
|
|
Surfactants
(total) (b)
|
<1.0
(a)
|
15
|
Yes
|
|
Notes:
(d) Effluent sample collected on 24 August 2023.
(e) Parameter not required to be reported in
accordance with Section B2 of the Effluent Discharge Licence under the WPCO.
(f) Parameters required to be reported
in accordance with Section B2 of the Effluent Discharge Licence under the
WPCO.
|
Table
4.13 Results of the Discharge Sample from
the Petrol Interceptor 2 on 24 August 2023
|
Parameters
|
Discharged Effluent Concentration (mg/L)
|
Discharge Limit (mg/L)
|
Compliance with Discharge Limit
|
|
Suspended
Solids (b)
|
5
(a)
|
30
|
Yes
|
|
Chemical
Oxygen Demand (c)
|
36
(a)
|
80
|
Yes
|
|
Oil
& Grease (c)
|
<5
(a)
|
20
|
Yes
|
|
Surfactants
(total) (b)
|
<1.0
(a)
|
15
|
Yes
|
|
Notes:
(d) Effluent sample collected on 24 August 2023.
(e) Parameter not required to be reported in
accordance with Section B2 of the Effluent Discharge Licence under the WPCO.
(f) Parameters required to be reported
in accordance with Section B2 of the Effluent Discharge Licence under the
WPCO.
|
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 ().
Reference has been made to the Monthly Summary Waste Flow Tables prepared by
the Contractor (see Annex D).
With reference to the relevant handling records and trip tickets of this
Project, the quantities of different types of waste generated from the
operation of the Project in the reporting period are summarised in Table 4.14.
Table 4.14
Quantities of Waste Generated from the Operation of the Project
|
Month / Year
|
Chemical Waste
|
Waste Generated from
Pre-treatment Process
|
General Refuse
|
|
|
Disposal of at CWTC
|
Disposed of at Landfill (a)
|
Recycled (b)
|
Disposed of at Landfill (a) (e)
|
Recycled (c)
|
|
June 2023
|
1000 L (d)
|
653.92
tonnes
|
0.04
tonnes
|
2.88tonnes (e)
|
0.11
tonnes
|
|
July 2023
|
0 L (d)
|
713.68 tonnes
|
0.00 tonnes
|
2.765tonnes (e)
|
0.085 tonnes
|
|
August 2023
|
0 L (d)
|
677.43 tonnes
|
0.00 tonnes
|
3.110 tonnes (e)
|
0.130 tonnes
|
|
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 tonnes of metals, 0.04 tonnes of papers/ cardboard packing and
0.00 tonnes of plastics were sent to recyclers for recycling during the
reporting period.
(c) Among general refuse, 0.030 tonnes of metals,
0.230 tonnes of papers/ cardboard packing and 0.065 tonnes of plastics were
sent to recyclers for recycling during the reporting period.
(d) 800L of spent lube oil and 200 kg of spent absorbent contaminated with
acid were
disposed at CWTC in June 2023; no chemical waste was disposed of at CWTC from
July to August 2023.
(e) It was assumed that four 240-litre bins
filled with 80% of general refuse were collected at each collection. The
general refuse density was assumed to be around 0.15 kg/L.
|
5
Site Audit
5.1
Environmental
Site Audit
5.1.1
Operation
Phase
The monthly inspections of 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 C).
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 2023
The monthly inspection of the
operation phase of the Project on 29 June 2023 covered the operation phase
environmental site audit. Joint site inspections were conducted by
representatives of the Contractor, IEC and the MT on 29 June 2023 as required
for the operation of the Project.
Chemical containers without
drip-tray were observed. The Contractor was reminded to provide drip tray for
the containers or remove the chemical containers.
Apart from the observation above,
the Contractor has implemented environmental mitigation measures recommended in
the approved EIA Report and EM&A Manual.
July 2023
The monthly inspection of the
operation phase of the Project on 27 July 2023 covered the operation phase
environmental site audit. Joint site inspections were conducted by
representatives of the Contractor, IEC and the MT on 27 July 2023 as required
for the operation of the Project.
August 2023
The monthly inspection of the
operation phase of the Project on 25 August 2023 covered the operation phase environmental
site audit. Joint site inspections were conducted by representatives of the
Contractor, IEC and the MT on 25 August 2023 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 C 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 2023
Monthly inspection of
the landscape and visual mitigation measures for the operation phase of the
Project was performed on 29 June 2023.
July 2023
Monthly inspection of
the landscape and visual mitigation measures for the operation phase of the
Project was performed on 27 July 2023.
August 2023
Monthly inspection of
the landscape and visual mitigation measures for the operation phase of the
Project was performed on 25 August 2023.
6
Environmental Non-conformance
6.1
Summary of Environmental
Non-Compliance
June 2023
Non-compliance of emission limits of NOx
and SO2, from CHPs, as well as NOx, SO2 and NH3
from ASP were recorded during the reporting period.
Non-compliance of discharge limits of Total Nitrogen and
Total Phosphorus from the outlet chamber of the effluent storage tank were
recorded during the reporting period.
The Contractor has reviewed the organic waste treatment processes (i.e.,
waste reception, waste pre-treatment, anaerobic digesters, and composting
processes) and found that they were operated normally during the reporting
period. The Contractor has investigated the de-sulphurisation system, CHPs and
the ASP, the potential causes for the exceedance were identified.
The investigation
reports of the above exceedances are presented in Annex F.
July 2023
Non-compliance of emission limits of NOx and SO2, from
CHPs, HCl from CHP3 and NOx, SO2 and NH3 from
ASP were recorded during the reporting period.
Non-compliance of discharge limits of Total Nitrogen and Total
Phosphorus from the outlet chamber of the effluent storage tank was recorded
during the reporting period.
The Contractor has reviewed the organic waste treatment processes (i.e.,
waste reception, waste pre-treatment, anaerobic digesters, and composting
processes) and found that they were operated normally during the reporting
period. The Contractor has investigated the de-sulphurisation system,
CHPs, the ASP and the Effluent treatment system, the potential causes for the
exceedance were identified.
The investigation
reports of the above exceedances are presented in Annex F.
August 2023
Non-compliance of emission limits of Total Odour (NH3 and H2S) from the CAPCS;
NOx and SO2 from CHP1; NOx, SO2,
and HCl from CHP2; NOx and SO2 from CHP3; and NOx,
SO2 and NH3 from the ASP were recorded during the
reporting period.
All analytes from the outlet chamber of the effluent storage tank and
Petrol Interceptors were recorded to be in compliance with
discharge limits during the reporting period.
The Contractor has reviewed the organic waste treatment processes (i.e.,
waste reception, waste pre-treatment, anaerobic digesters, and composting
processes) and found that they were operated normally during the reporting
period. The Contractor has investigated the de-sulphurisation system, CHPs, and
the ASP; the potential causes for the exceedance were identified.
The exceedances of
Total Odour (NH3 and H2S) from
the CAPCS were caused by the filter being blocked and the sensor head being
clogged with moisture. The sensors of NH3 and H2S will be
calibrated in September 2023. The investigation reports of the above
exceedances are presented in Annex
F.
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 E.
7
Future Key Issues
7.1
Key Issues for the Coming Reporting Period
Activities to be undertaken for the coming reporting period are:
·
Repairing the door
seals on composting tunnels (x2);
·
Removing the leaking
Jet Mixing Pump 2034P501;
·
Repairing the SBR 3
gasket on the compressed air line (confined space work); and
·
Replacing the motor
bearings on Venturi scrubber 1, recirculation pump 1, and 6093P101.
8
Conclusions
This EM&A Report presents the EM&A programme undertaken during
the reporting period from 1 June to 31 August 2023 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 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 Total Odour (NH3 and H2S) on 1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, and 25 August 2023.
|
|
Cogeneration Unit
(CHP) 1
|
·
Exceeded emission
limit of NOx on 2, 3, 4, 5, 6, 9, 11, 12, 13, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, and 30 June 2023; 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 27, 28, 29, 30, and 31
July 2023; 1, 2, 3, 4, 5, 8, 9, 11, 12, 13, 14, 18, 19, 20, 23, 24, 25, 26,
27, 28, 29, 30, and 31 August 2023.
·
Exceeded emission
limit of SO2 on 2, 3, 4, 5, 6, 9, 10, 11,
12, 13, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30 June 2023; 1, 2,
3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 21, 22, 23, 24, 27
and 31 July 2023; 1, 2, 3, 5, 11, 12, 13, 14, 18, 19, 20, 23, 24, 26, 27, 28,
29, 30, and 31 August 2023.
|
|
Cogeneration Unit
(CHP) 2
|
·
Exceeded emission
limit of NOx on 1, 2, 3, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17,
18, 19, 20, 21, 26, and 27 June 2023; 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13,
14, 15, 16, 17, 18, 19, 20, 21, 25, 27, 28, and 30 July 2023; 1, 2, 3, 4, 5,
6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 26, 28, and 29 August
2023.
·
Exceeded emission
limit of SO2 on 1, 2, 3, 6, 7, 8, 9, 10, 11, 12, 14, 15, 19, 20,
and 21 June 2023; 10, 11, 12, 20, 21, 24, 25, 26, 27, 28, and 31 July 2023;
1, 2, 3, 4, 5, 12, 13, 15, 16, 17, 18, and 19 August 2023.
·
Exceeded emission
limit of HCl on 17 August 2023.
|
|
Cogeneration Unit
(CHP) 3
|
·
Exceeded emission
limit of NOx on 3, 4, 5, 6, 7, 13, 14, 15, 16, 17, 18, 19, 21, 22,
23, 24, 25, 26, 28, 29, and 30 June 2023; 3, 4, 5, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, and 31 July 2023; on 3, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16,
17, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, and 31 August
2023.
·
Exceeded emission
limit of SO2 on 3, 4, 5, 7, 14, 15, 16, 17, 18, 19, 22, 23, 25,
26, 28, 29, and 30 June 2023; 3, 4, 5, 19, 20, 21, 22, 23, 24, 25, 26, 27,
and 31 July 2023; 3, 7, 8, 9, 10, 14, 15, 16, 17, 19, 20, 22, 23, 24, 28, 30,
and 31 August 2023.
·
Exceeded emission
limit of HCl on 21 and 26 July 2023.
|
|
Ammonia
Stripping Plant (ASP)
|
· Exceeded emission limit of NOx on 1, 2, 3, 5, 6, 7, 15, and
20 June 2023; 1, 5, 6, 8, 10, 11, 12, 14, 16, 17, 18, 19, 22, 23, 24, 25, 26,
27, 28, 29, 30, and 31 July 2023; 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 14, 15,
16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 28, 29, 30, and 31 August 2023.
· Exceeded emission limit of SO2 on 2 and 3 June 2023; 26,
28, 29, and 30 July 2023; 1, 2, 8, 9, 13, 16, 17, 18, 19, 22, and 31 August
2023.
· Exceeded emission limit of NH3 on 3, 5, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30 June 2023; 1,
5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, and 26
July 2023; 3, 5, 6, 7, 8, 10, 12, and 13 August 2023.
|
Non-compliance of emission limits of Total Odour from CAPCS were
recorded during August 2023 and occurred due to system instability.
Non-compliance of emission limits of NOx and SO2
from CHPs as well as NOx, SO2 and NH3 from ASP
were recorded during June 2023. The exceedances of NOx,
and SO2 from CHPs as well as the
exceedances of NOx, SO2
and NH3 from ASP occurred due to
system instability.
Non-compliance of emission limits of
NOx and SO2 from CHPs; HCl from CHP3; and NOx,
SO2 and NH3 from ASP were recorded during July 2023. The
exceedances of NOx and SO2 from CHPs; the exceedances of
HCl from CHP3; and the exceedances of NOx,
SO2 and NH3 from ASP occurred due to system instability.
Non-compliance of emission limits of NOx and SO2 from
CHP1; NOx and SO2, and HCl from CHP2; NOx and
SO2, from CHP3; and NOx, SO2 and NH3
from ASP were recorded during August 2023. The exceedances of NOx
and SO2 from CHPs, and the exceedances of NOx, SO2,
and NH3 from ASP occurred due to system instability.
Table 8.2
Exceedances for Outlet Chamber of the Effluent Storage Tank
|
Effluent Discharge
Point
|
Exceedances During
the Reporting Period
|
|
Outlet
Chamber of the Effluent Storage Tank
|
·
Exceeded
discharge limit of Total Nitrogen and Total Phosphorus on both 9 June 2023
and 31 July 2023.
|
Non-compliance of
discharge limit of Total Nitrogen from the Outlet Chamber of the Effluent
Storage Tank were recorded on 9 June 2023 and 31 July 2023. In June 2023, the
Contractor 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. In July
2023, the exceedances
occurred due to fresh seeding sludge injection to the SBR system in mid-July
2023, bacterial activities of second stage treatment for the complete removal
cycle was lagging behind which resulted in incomplete
bacterial reaction of the effluent. In August 2023, all analytes from the
outlet chamber of the effluent storage tank were recorded to be
in compliance with the discharge limits.
During the reporting period, both
Petrol Interceptor 1 and Petrol Interceptor 2 were recorded to be in compliance with discharge limits.
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.
