1 inTroduction
1.1 Purpose
of the Report
1.2 Structure
of the Report
2 Project
information
2.1 Background
2.2 General
Site Description
2.3 Major
Activities Undertaken
2.4 Project
Organisation and Management Structure
2.5 Status
of Environmental Approval Documents
3 Environmental
Monitoring and Audit Requirements
3.1 Environmental
Monitoring
3.1.1 Air Quality
3.1.2 Odour
3.2 Site
Audit
3.2.1 Water Quality
3.2.2 Landscape and Visual
4 Monitoring
Results
4.1 Air
Quality
4.1.1 Commissioning Phase Monitoring
4.1.2 Operation Phase Monitoring
4.2 Odour
4.2.1 Commissioning Phase Monitoring
4.2.2 Operation Phase Monitoring
4.3 Water
Quality
4.3.1 Construction Phase Monitoring
4.3.2 Operation Phase Monitoring
4.4 Waste
Management
4.4.1 Construction Phase Monitoring
4.4.2 Operation Phase Monitoring
5 Site
Audit
5.1 Environmental
Site Audit
5.1.1 Construction Phase
5.1.2 Operation Phase
5.2 Landscape
and Visual Audit
6 Environmental Non-conformance and Deficiencies
6.1 Summary
of Environmental Non-Compliance and Deficiencies
6.2 Summary
of Environmental Complaint
6.3 Summary
of Environmental Summon and Successful Prosecution
7 Future
Key Issues
7.1 Key
Issues for the Coming Month
8 Conclusions
Table 2.1 Summary
of Activities Undertaken in the Reporting Period
Table 2.2 Summary
of Environmental Licensing, Notification and Permit Status
Table 3.1Sampling and Laboratory Analysis Methodology
Table 3.2Emission Limit for CAPCS Stack
Table 3.3Emission Limit for CHP Stack
Table 3.4Emission Limit for ASP Stack
Table 3.5Emission Limit for Standby Flaring Gas Unit ()
Table 3.6Odour Intensity Level
Table 3.7Action and Limit Levels for Odour Nuisance
Table 3.8Event and Action Plan for Odour Monitoring
Table 3.9Discharge Limits for Effluent
Table 4.1 Hourly
Average of Parameters Recorded for CAPCS
Table 4.2 Hourly
Average of Parameters Recorded for CHP 1
Table 4.3 Hourly
Average of Parameters Recorded for CHP 2
Table 4.4 Hourly
Average of Parameters Recorded for CHP 3
Table 4.5Hourly Average of Parameters Recorded for
ASP
Table 4.6Results of the Discharge Sample
Table 4.7 Quantities
of Waste Generated from the Construction of the Project
Table 4.8 Quantities
of Waste Generated from the Operation of the Project
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 51st monthly Environmental Monitoring and Audit
(EM&A) report presenting the EM&A works carried out during the period
from 1 to 31 August 2019 in accordance with the EM&A Manual. Substantial
completion of the construction works was confirmed on 3 December 2018. In the
meantime, the operation phase EM&A programme had commenced in March 2019.
Summary of Works undertaken
during the Reporting Month
Works undertaken in the
reporting month included:
·
Operation
of the Project, including organic waste reception, and operation of the
pre-treatment facilities, anaerobic digesters, composting facilities, air
pollution control systems, on-line emission monitoring system for the
Centralised Air Pollution Control Unit (CAPCS), Co-generation Units (CHP)s and
Ammonia Stripping Plant (ASP), and the wastewater treatment plant;
·
Process
fine-tune, including adjustment of the ASP with new treatment media,
modification of Continuous Environmental Monitoring System (CEMS) and
Supervisory Control and Data Acquisition System (SCADA) rectification and
improvement works following equipment failures and the alteration of different
operation modes and measures to adapt to the high variation of SSOW nature and
sources; and
·
Construction
of the Visitor Centre.
Environmental Monitoring and
Audit Progress
Air Quality Monitoring
Exceedances
on Dust (or TSP), NOx, SO2, HCl and HF from CHP and on Carbon
Monoxide, NOx, SO2, VOCs (including methane) and NH3
from
ASP were recorded on the on-line monitoring system. It should be noted that measurements
recorded under abnormal operating conditions, e.g. start up and stopping of
stacks, unstable operation, test runs and interference of sensor, are disregarded.
Exceedances in emission
parameters of CHP and ASP were found to be a result of problems with the
continuous fine-tuning of CHP and ASP setting.
The
Contractor has implemented mitigation measures to control the exceedance (including
the fine-tuning of emission control for CHP; and the modification of the ASP to
optimise overall performance).
The Contractor is recommended
to closely monitor the processes, including the modification the ASP to rectify
any abnormal operating conditions.
Odour
Odour patrol was conducted by
the independent odour patrol team of ALS Technichem (HK) Pty Ltd on 6 August
2019. 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
construction of the Project includes inert construction and demolition
(C&D) materials (public fill) and non-inert C&D materials (construction
wastes).
Inert C&D materials
(public fill) include bricks, concrete, building debris, rubble and excavated
spoil. In total, 15.19 tonnes of inert C&D material were generated from the
construction of the Project.
Non-inert C&D materials
(construction wastes) from the construction of this Project include metals,
paper/ cardboard packaging waste, plastics and other wastes such as general
refuse. 0.00 kg of metals, 0.00 kg of papers/ cardboard packing and 0.00 kg of
plastics were sent to recyclers for recycling during the reporting period. 9.73
tonnes of general refuse was disposed of at the landfill.
0.00 L of chemical waste was collected
by licenced waste collector from the construction of the Project.
Waste generated from the
operation of the Project includes chemical waste, waste generated from
pre-treatment process and general refuse.
40 L of chemical waste was
collected by licenced waste collector from the operation of the Project.
441.05 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 3.11 tonnes of general
refuse from the operation of the Project was disposed of at landfill. Among the
recycled general refuse from the operation of the Project, 0.00 kg of metals,
0.00 kg of papers/ cardboard packing and 0.00 kg of plastics were sent to
recyclers for recycling during the reporting period.
Findings of Environmental
Site Audit
A summary of the monitoring activities undertaken in this
reporting period is listed below:
|
·
Joint
Environmental Site Inspections
|
4
times
|
|
·
Landscape
& Visual Inspections
|
2
times
|
4 weekly joint
environmental site inspections were carried out by the representatives of the
Contractor and the ET. The ER and IEC were also present at the joint
inspections on
14 August 2019.
The environmental control/ mitigation measures (related to air quality, water
quality, waste (including land contamination prevention), hazard-to-life and
landscape and visual) recommended in the approved EIA Report and the EM&A
Manual were properly implemented by the Contractor during the reporting month.
Environmental
Exceedance/Non-conformance/Compliant/Summons and Prosecution
Exceedances
for the air emission limits for the CHP and ASP stacks were recorded during the
reporting period.
An incident related to the
release of biogas occurred on 25 August 2019.
No complaint/ summon/prosecution
was received in this reporting period.
Future Key Issues
Activities to be undertaken
in the next reporting month include:
·
Operation
of the Project.
·
Implementation
of further measures to control the air emission from the CHP and ASP.
·
Continue
construction of the Visitor Centre.
1
inTroduction
ERM-Hong Kong, Limited (ERM)
was appointed by OSCAR Bioenergy Joint Venture (the Contractor) as the Environmental
Team (ET) to undertake the construction Environmental Monitoring and Audit
(EM&A) programme for the Contract No. EP/SP/61/10 of Organic Waste
Treatment Facilities Phase I, which the project name has been updated
to Organic Resources Recovery Centre (Phase I) (the
Project)
since November
2017. ERM was also
appointed by the Contractor to undertake the operation EM&A programme
starting 1 March 2019.
This is the 51st EM&A
report which summarises the monitoring results and audit findings for the
EM&A programme during the reporting period from 1 to 31 August 2019.
The structure of the report is as
follows:
Section 1: Introduction
It details the scope and structure of
the report.
Section 2: Project
Information
It summarises the
background and scope of the Project, site description, project organisation and
status of the Environmental Permits (EP)/licences.
Section 3: Environmental Monitoring
and Audit Requirements
It summarises the
environmental monitoring requirements including monitoring parameters,
programmes, methodologies, frequency, locations, Action and Limit Levels,
Event/Action Plans, as well as environmental audit requirements as recommended
in the EM&A Manual and approved EIA report.
Section 4: Monitoring Results
It summarises monitoring
results of the reporting period.
Section 5: Site Audit
It summarises the audit
findings of the environmental as well as landscape and visual site audits
undertaken within the reporting period.
Section 6: Environmental
Non-conformance
It summarises any exceedance
of environmental performance standard, environmental complaints and summons
received within the reporting period.
Section 7: Further Key
Issues
It summarises the impact
forecast for the next reporting month.
Section 8: Conclusions
2
Project
information
The Organic Resources Recovery Centre
(ORRC) Phase I development (hereinafter referred to as “the Project”) is to
design, construct and operate a biological treatment facility with a capacity
of about 200 tonnes per day and convert source-separated organic waste from
commercial and industrial sectors (mostly food waste) into compost and biogas
through proven biological treatment technologies. The location of the Project
site is shown in Annex A.
The environmental
acceptability of the construction and operation of the Project had been
confirmed by findings of the associated Environmental Impact Assessment (EIA)
Study completed in 2009. The Director of Environmental Protection (DEP)
approved this EIA Report under the Environmental Impact Assessment Ordinance
(EIAO) (Cap. 499) in February 2010 (Register No.: AEIAR-149/2010)
(hereafter referred to as the approved EIA Report). Subsequent Report on
Re-assessment on Environmental Implications and Report on Re-assessment on
Hazard to Life Implications were completed in 2013, respectively.
An Environmental Permit (EP)
(No. EP-395/2010) was issued by the DEP to the EPD (Project Team), the
Permit Holder, on 21 June 2010 and varied on 18 March 2013 (No. EP-395/2010/A)
and 21 May 2013 (No. EP-395/2010/B), respectively. The Design Build and
Operate Contract for the ORRC Phase 1 (Contract No. EP/SP/61/10 Organic
Resources Recovery Centre (Phase 1) (the Contract)) was awarded to SITA Waste
Services Limited, ATAL Engineering Limited and Ros-Roca, Sociedad Anonima
jointly trading as the OSCAR Bioenergy Joint Venture (OSCAR or the
Contractor). A Further EP (No. FEP-01/395/2010/B) was issued by the DEP to the
OSCAR on 16 February 2015. Variation to both EPs (Nos. EP-395/2010/B and
FEP-01/395/2010/B) were made in December 2015. The latest EPs, Nos.
EP-395/2010/C and FEP-01/395/2010/C, were issued by the DEP on 21 December
2015.
Under the requirements of
Condition 5 of the EP (No. FEP-01/395/2010/C), an Environmental Monitoring and
Audit (EM&A) programme as set out in the approved EM&A Manual
(hereinafter referred to as EM&A Manual) is required to be implemented
during the construction and operation of the Project. ERM-Hong Kong, Ltd (ERM)
has been appointed by OSCAR as the Environmental Team (ET) for the construction
phase EM&A programme and the Monitoring Team (MT) for the operation phase
EM&A programme for the implementation of the EM&A programme in accordance with the
requirements of the EP and the approved EM&A Manual.
The construction
works commenced on 21 May 2015. The operation phase of the EM&A programme
commenced on 1 March 2019 ().
The Project Site is located at Siu Ho
Wan in North Lantau with an area of about 2 hectares. The layout of the Project Site is
illustrated in Annex A. The facility received and
treated an average of 100 tonnes of source separated organic waste per day
during the reporting month.
A summary of the major activities
undertaken in the reporting period is shown in Table 2.1. The site layout plan is
shown in Annex B. The construction programme
is shown in Annex C.
Table
2.1 Summary of Activities Undertaken
in the Reporting Period
|
Activities Undertaken in the
Reporting Period
|
|
·
Systems being operated – waste reception,
pre-treatment, CAPCS extraction, the digesters, the centrifuge, , the
composting tunnels the desulphurisation, the emergency flare, the CHPs, the
ASP and the biological waste water treatment plant (about 100-130 t/d SSOW
input);
·
Process fine-tune – adjustment of the ASP
operational parameters with new treatment media, CEMS/SCADA modification and
improvement work following equipment failures and the alteration of different
operation modes and measures to adapt to the high variation of SSOW nature
and sources; and
·
Construction of the Visitor Centre.
|
2.4
Project Organisation
and Management Structure
The project organisation chart and
contact details are shown in Annex D.
A summary of the valid permits,
licences, and/or notifications on environmental protection for this Project is
presented in Table 2.2.
Table 2.2 Summary of Environmental
Licensing, Notification and Permit Status
|
Permit/
Licences/ Notification
|
Reference
|
Validity
Period
|
Remarks
|
|
Environmental
Permit
|
FEP-01/395/2010/C
|
Throughout
the Contract
|
Permit
granted on 21 December 2015
|
|
Notification
of Construction Works under the Air Pollution Control (Construction Dust)
Regulation
|
Ref
No. 386715
|
Throughout
the Contract
|
-
|
|
Effluent
Discharge License
|
WT00024352-2016
|
3 June
2016 – 30 June 2021
|
Approved
on 3 June 2016
|
|
Construction
Noise Permit – P1&P2
|
GW-RW0280-19
(Superseded
CNP GW-RW0538-18)
|
21 July
2019-20 January 2020
|
Approved
on 28 June 2019
|
|
Chemical
Waste Producer Registration
|
WPN
5213-961-O2231-01
|
Throughout
the Contract
|
Approved
on 29 April 2015
|
|
Chemical Waste Producer Registration
|
WPN 5213-961-O2231-02
|
Throughout the implementation of the Project
|
Approved on 10 November 2017
|
|
Waste
Disposal Billing Account
|
Account
number: 702310
|
Throughout
the Contract
|
-
|
3
Environmental
Monitoring and Audit Requirements
The air quality (including odour)
monitoring to be carried out during the commissioning and operation phase of
the Project are described below. No monitoring for noise, waste, land
contamination, hazard-to-life and landscape and visual are required during construction
and operation phases of the Project. Although water quality monitoring is not
required for the construction and operation phases under the EM&A
programme, there are water quality monitoring requirement under the Water
Discharge Licence of the plant under the Water Pollution Control Ordinance
(WPCO). As part of this EM&A programme, the monitoring results will be
reviewed to check the compliance with the WPCO requirements.
3.1.1
Air
Quality
According to the EM&A Manual and EP
requirements, stack monitoring are required during the commissioning and operation
phase of the Project.
On-line monitoring (using continuous
environmental monitoring system (CEMS) shall be carried out for the centralised
air pollution unit (CAPCS), cogeneration units (CHP) and the ammonia stripping
plant (ASP) during the commissioning and operation phase. The calibration
certificate for the on-line monitoring equipment is provided in Annex E.
The monitoring data is transmitted
instantaneously to EPD (Regional Office) by telemetry system.
When the on-line monitoring for certain
parameter cannot be undertaken, monitoring will be carried out using the
following methodology approved by the EPD.
Table 3.1 Sampling and Laboratory Analysis
Methodology
|
Parameters
|
Method
|
Stacks to
be Monitored
|
|
Gaseous and
vaporous organic substances (including methane)
|
USEPA
Method 18
|
· CAPCS
· CHP
· ASP
|
|
Particulate
|
USEPA
Method 5
|
· CAPCS
· CHP
· ASP
|
|
Carbon monoxide
(CO)
|
USEPA Method 10
|
· CHP
· ASP
|
|
Nitrogen
oxides (NOx)
|
USEPA
Method 7E
|
· CHP
· ASP
|
|
Sulphur
dioxide (SO2);
|
USEPA
Method 6
|
· CHP
· ASP
|
|
Hydrogen
chloride (HCl)
|
USEPA
Method 26A
|
· CHP
· ASP
|
|
Hydrogen
fluoride (HF)
|
USEPA
Method 26A
|
· CHP
· ASP
|
|
Oxygen
(O2);
|
USEPA
Method 3A
|
· CAPCS
· CHP
· ASP
|
|
Velocity
and Volumetric Flow
|
USEPA
Method 2
|
· CAPCS
· CHP
· ASP
|
|
Ammonia
(NH3)
|
USEPA CTM
027
|
· ASP
|
|
Odour
(including NH3 and H2S)
|
EN 13725
|
· CAPCS
|
|
Water
vapour content (continuous measurement of the water vapour content should not
be required if the sample exhaust gas is dried before the emissions are
analysed)
|
USEPA
Method 4
|
· CAPCS
· CHP
· ASP
|
|
Temperature
|
USEPA
Method 4
|
· CAPCS
· CHP
· ASP
|
With reference to the
EM&A Manual, the air emission of the stacks shall meet the following
emission limits as presented in Tables 3.2 to 3.5.
Table 3.2 Emission Limit for CAPCS Stack
|
Parameter
|
Emission
Level (mg/Nm3) (a)
|
|
VOCs (including
methane)
|
680
|
|
Dust
(or Total Suspended Particulates
(TSP))
|
6
|
|
Odour (including NH3 & H2S)
|
220 (b)
|
|
Notes:
(a) Hourly average
concentration
(b) The odour unit is OU/Nm3
|
Table 3.3 Emission Limit for CHP Stack
|
Parameter
|
Maximum
Emission Level (mg/Nm3) (a) (b)
|
|
Dust
(or Total Suspended Particulates)
|
15
|
|
Carbon
Monoxide
|
650
|
|
NOx
|
300
|
|
SO2
|
50
|
|
NMVOCs (c)
|
150
|
|
VOCs (including methane) (d)
|
1,500
|
|
HCl
|
10
|
|
HF
|
1
|
|
Notes:
(a)
All values refer to an oxygen content in the exhaust gas of 6% and dry basis.
(b)
Hourly average concentration
(c)
NMVOCs should be monitored by gas sampling and laboratory analysis at an
agreed interval. For the first 12 months (starting from August 2019),
monitoring should be carried out at quarterly intervals. The monitoring
frequency should then be reduced to half-yearly for next 12 months (starting
from August 2020).
(d)
The VOCs emission limit include methane as biogas is adopted as fuel in the
combustion process.
|
Table
3.4 Emission Limit for ASP Stack
|
Parameter
|
Maximum
Emission Level (mg/Nm3) (a) (b)
|
|
Dust
(or Total Suspended Particulates)
|
5
|
|
Carbon
Monoxide
|
100
|
|
NOx
|
200
|
|
SO2
|
50
|
|
VOCs (including methane) (c)
|
20
|
|
NH3
|
35
|
|
HCl
|
10
|
|
HF
|
1
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 11% and dry basis.
(b) Hourly average
concentration
(c) The VOCs emission limit
include methane as biogas is adopted as fuel in the combustion process.
|
Table 3.5 Emission Limit for Standby
Flaring Gas Unit ([2])
|
Parameter
|
Maximum
Emission level (mg/Nm3) (a) (b)
|
|
Dust (or Total
Suspended Particulates)
|
5
|
|
Carbon Monoxide
|
100
|
|
NOx
|
200
|
|
SO2
|
50
|
|
VOCs (including
methane) (c)
|
20
|
|
HCl
|
10
|
|
HF
|
1
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 11% and dry basis.
(b) Hourly average
concentration
(c) The VOCs emission limit
include methane as biogas is adopted as fuel in the combustion process.
|
To determine the
effectiveness of the proposed odour mitigation measures and to ensure that the
operation of the ORRC1 will not cause adverse odour impacts, odour monitoring
of the CAPCS stack (see Section 3.1.1) and odour patrol will be carried
out.
Odour patrol shall be conducted by
independent trained personnel/ competent persons in summer months (i.e. from
July to September) for the first two operational years of ORRC1 at monthly intervals
along an odour patrol route at the Project Site boundary as shown in Annex A.
The perceived odour intensity is divided
into 5 levels. Table 3.6 describes the odour intensity for different
levels.
Table 3.6 Odour Intensity Level
|
Level
|
Odour Intensity
|
|
0
|
Not
detected. No odour
perceived or an odour
so weak that it cannot be easily
characterised or described
|
|
1
|
Slight identifiable
odour, and slight
chance to have odour
nuisance
|
|
2
|
Moderate identifiable
odour, and moderate chance to have odour nuisance
|
|
3
|
Strong identifiable,
likely to have odour nuisance
|
|
4
|
Extreme severe
odour, and unacceptable odour level
|
Table 3.7 shows the action level and
limit level to be used for odour patrol. Should any exceedance of the action
and limit levels occurs, actions in accordance with the event and action plan
in Table 3.8 should be carried out.
Table
3.7 Action and Limit Levels for
Odour Nuisance
|
Parameter
|
Action
Level
|
Limit Level
|
|
Odour Nuisance
(from odour patrol)
|
When one
documented compliant is received (a), or Odour Intensity of 2 is measured from odour patrol.
|
Two or
more documented complaints
are received (a) within a week; or
Odour intensity of 3 or above is measured
from odour patrol.
|
|
Note:
(a) Once the complaint is
received by the Project Proponent (EPD), the Project Proponent would
investigate and verify the complaint whether it is related to the potential
odour emission from the ORRC1 and its on-site wastewater treatment unit.
|
Table
3.8 Event and Action Plan for Odour
Monitoring
|
Event
|
Action
|
|
|
Person-in-charge of Odour Monitoring
|
Project
Proponent (a)
|
|
Action Level
|
|
|
|
Exceedance of
action level (Odour Patrol)
|
1. Identify
source/reason of exceedance;
2. Repeat
odour patrol to confirm finding.
|
1. Carry out
investigation to identify the source/reason of exceedance. Investigation
should be completed within 2 weeks;
2. Rectify any
unacceptable practice;
3. Implement
more mitigation measures if necessary;
4. Inform
Drainage Services Department (DSD) or the operator of the Siu Ho Wan Sewage
Treatment Works (SHWSTW) if exceedance is considered to be caused by the
operation of the SHWSTW.
5. Inform
North Lantau Refuse Transfer Station (NLTS) operator if exceedance is
considered to be caused by the operation of NLTS.
|
|
Exceedance of
action level (Odour Complaints)
|
1. Identify
source/reason of exceedance;
2. Carry out
odour patrol to determinate odour intensity.
|
1. Carry out
investigation and verify the complaint whether it is related to potential
odour emission from the nearby SHWSTW;
2. Carry out
investigation to identify the source/reason of exceedance. Investigation
should be completed within 2 weeks;
3. Rectify any
unacceptable practice;
4. Implement
more mitigation measures if necessary;
5. Inform DSD
or the operator of the SHWSTW if exceedance is considered to be caused by
the operation of the SHWSTW.
6. Inform NLTS
operator if exceedance is considered to be caused by the operation of NLTS.
|
|
Limit Level
|
|
|
|
Exceedance of limit
level
|
1.
Identify source/reason of exceedance;
2.
Inform EPD;
3.
Repeat odour patrol to confirm findings;
4.
Increase odour patrol frequency to bi-weekly;
5.
Assess effectiveness of remedial action and keep EPD informed of the
results;
6.
If exceedance stops, cease additional odour patrol.
|
1.
Carry out investigation to identify the source/reason of exceedance.
Investigation should be completed within 2 week;
2.
Rectify any unacceptable practice;
3.
Formulate remedial actions;
4.
Ensure remedial actions properly implemented;
5.
If exceedance continues, consider what more/enhanced mitigation measures
should be implemented;
6.
Inform DSD or the operator of the SHWSTW if exceedance is considered to be
caused by the operation of the SHWSTW.
|
|
Note:
(a) Project Proponent shall
identify an implementation agent.
|
Environmental mitigation measures
(related to air quality, water quality, waste, land contamination,
hazard-to-life, and landscape and visual) to be implemented during the construction
and operation phase of the Project are recommended in the approved EIA Report
and EM&A Manual and are summarised in Annex F. Weekly site audits for construction phase and
monthly site audits for operation phase will be carried out to check the
implementation of these measures.
Compliance audits are to be undertaken
to ensure that a valid discharge licence has been issued by EPD prior to the
discharge of effluent from the operation of the Project site. The audit shall
be conducted to ensure that the effluent quality is in compliance with the
discharge licence requirements. The effluent quality shall meet the discharge
limits as described in Table 3.9.
Table 3.9 Discharge Limits for Effluent
|
Parameters
|
Discharge
Limit (mg/L)
|
|
Flow Rate (m3/day)
|
685
|
|
pH (pH units)
|
6-10 (a)
|
|
Suspended
Solids
|
800
|
|
Biochemical
Oxygen Demand (5 days, 20°)
|
800
|
|
Chemical Oxygen
Demand
|
2,000
|
|
Oil &
Grease
|
40
|
|
Total Nitrogen
|
200
|
|
Total
Phosphorus
|
50
|
|
Surfactants
(total)
|
25
|
|
Note:
(a) Range.
|
In accordance with EM&A
Manual, the landscape and visual mitigation measures shall be implemented.
Bi-weekly landscape and visual audit during the construction phase is required to ensure
that the design, implementation and maintenance of landscape and visual
mitigation measures recommended in the approved EIA Report are fully achieved. The implementation status
of the mitigation measures for construction phase is summarised in Annex F.
For operation phase, site
inspection shall be conducted once a month for the first year of operation of
the Project. All measures as stated in the implementation schedule of the
EM&A Manual (see Annex F),
including compensatory planting, undertaken by both the Contractor and the
specialist Landscape Sub-Contractor during the first year of the operation
phase shall be audited by a Registered Landscape Architect (RLA) to ensure
compliance with the intended aims of the measures and the effectiveness of the
mitigation measures.
4
Monitoring
Results
Monitoring results of air quality
parameters from stack emissions of the centralised air pollution control
system, the ammonia stripping plant and the cogeneration units will be provided
once available to show compliance with the monitoring requirements stated in
the EM&A Manual (Rev. F) to support the termination of the construction
phase EM&A programme.
The concentrations of concerned air
pollutants emitted from the stacks of the CAPCS, CHP, and ASP during the
reporting period are monitored on-line by the continuous environmental
monitoring system (CEMS). During the reporting period, there is no need to
operate the standby flare and therefore no monitoring of the flare stack was
undertaken.
With reference to the emission limits shown
in Tables 3.2, 3.3 and 3.4, the hourly average concentrations and
the number of exceedances of the concerned air emissions monitored for the
CAPCS, CHP and ASP during this reporting period are presented in Tables 4.1
to 4.5.
It should be noted that measurements
recorded under abnormal operating conditions, e.g. start up and stopping of
stacks, unstable operation, test runs and interference of sensor, are disregarded.
Table 4.1 Hourly Average of Parameters
Recorded for CAPCS
|
Parameter
|
Range of
Hourly Average Conc. (mg/Nm3)
|
Emission
Limit (mg/Nm3)
|
Exceedance
Identified
|
Remarks
|
|
VOCs (including
methane) (a)
|
0 – 19
|
680
|
Nil
|
Nil
|
|
Dust
(or TSP)
|
0 – 1.6
|
6
|
Nil
|
Nil
|
|
Odour (including NH3 & H2S) (b)
|
0 – 70
|
220
|
Nil
|
Nil
|
|
Notes:
(a)
Online
monitoring was not available during this reporting period. Alternative
monitoring method as specified in the EM&A manual was used to measure
VOCs. The Contractor has arranged for replacement of the sensor
immediately. The sensor is expected to be delivered near the end of
September 2019.
(b)
The
odour unit is OU/Nm3.
|
Table 4.2 Hourly Average of Parameters
Recorded for CHP
1
|
Parameter
|
Range
of Hourly Average Conc. (mg/Nm3) (a)
|
Max.
Emission Limit (mg/Nm3)
|
Exceedance
Identified
|
Remarks
|
|
Dust
(or TSP)
|
0
– 4
|
15
|
Nil
|
Nil
|
|
Carbon
Monoxide
|
0
– 352
|
650
|
Nil
|
Nil
|
|
NOx
|
0
– 255
|
300
|
Nil
|
Nil
|
|
SO2
|
0
– 50
|
50
|
Nil
|
Nil
|
|
NMVOCs (b)
|
Not
Available
|
150
|
Nil
|
Nil
|
|
VOCs (including methane) (c)
|
0
– 959
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0
– 1
|
10
|
Nil
|
Nil
|
|
HF
|
0.0
– 1.0
|
1
|
Nil
|
Nil
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 6%
and dry basis.
(b) No sampling was undertaken
at CHP1 as biogas
production rate could not sustain the operation of the CHP stack for the
scheduled samplings.
(c) The VOCs
emission limit include methane as biogas is adopted as fuel in the combustion
process.
|
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
– 7
|
15
|
Nil
|
Nil
|
|
Carbon
Monoxide
|
0
– 365
|
650
|
Nil
|
Nil
|
|
NOx
|
0
– 276
|
300
|
Nil
|
Nil
|
|
SO2
|
0
– 42
|
50
|
Nil
|
Nil
|
|
NMVOCs (b)
|
Not
Available
|
150
|
Nil
|
Nil
|
|
VOCs (including methane) (c)
|
0
– 997
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0
– 6
|
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) No sampling was undertaken
at CHP2 as biogas
production rate could not sustain the operation of the CHP stack for the
scheduled samplings.
(c) The VOCs
emission limit include methane as biogas is adopted as fuel in the combustion
process.
|
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
– 27
|
15
|
Identified (d)
|
Supplier
had been arranged to check the performance of the CHP and maintenance will be
arranged after detailed investigation.
|
|
Carbon
Monoxide
|
0
– 331
|
650
|
Nil
|
Nil
|
|
NOx
|
0
– 1,293
|
300
|
Identified (e)
|
Supplier
had been arranged to check the performance of the CHP and maintenance will be
arranged after detailed investigation.
|
|
SO2
|
0
– 111
|
50
|
Identified(f)
|
Tripping
of the desulphurisation column. Continuous monitoring to reduce the duration
of tripping.
|
|
NMVOCs (b)
|
6.9
|
150
|
Nil
|
See Annex G for laboratory
results
|
|
VOCs (including methane) (c)
|
0
– 1,406
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0
– 12
|
10
|
Identified (g)
|
Supplier had
been arranged to check the performance of the CHP and maintenance will be
arranged after detailed investigation.
|
|
HF
|
0
– 1.9
|
1
|
Identified (h)
|
Supplier had
been arranged to check the performance of the CHP and maintenance will be
arranged after detailed investigation.
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 6%
and dry basis.
(b) 1 sampling was conducted from CHP3 during
the reporting period. Result from the sampling conducted on 23 July 2019 is
finalised and provided in Annex
G. No exceedance was found from the sampling.
(c) The VOCs
emission limit include methane as biogas is adopted as fuel in the combustion
process.
(d) One exceedance on Dust (or TSP) was
recorded on 29 August 2019.
(e) Dates with exceedances on
NOx (number of exceedances on the day) were identified on 2 (2), 4
(4), 5 (1), 22 (1), 23 (7), 24 (2), 30 (2) and 31 (1) August 2019.
(f) Dates with exceedances on
SO2 (number of exceedances on the day) were identified on 6 (4),
22 (2), 30 (4) and 31 (18) August 2019.
(g) One exceedance on HCl was
recorded on 30 August2019.
(h) One exceedance on HF was
recorded on 30 August 2019.
|
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 – 5.0
|
5
|
Nil
|
Nil
|
|
Carbon
Monoxide
|
0 – 110
|
100
|
Identified (c)
|
Modification of
the ASP is being arranged with the supplier. The supplier will be on-site to
complete the modification and review the ASP operation.
|
|
NOx
|
0 – 703
|
200
|
Identified (d)
|
Modification of
the ASP is being arranged with the supplier. The supplier will be on-site to
complete the modification and review the ASP operation.
|
|
SO2
|
0 – 65
|
50
|
Identified (e)
|
Modification of
the ASP is being arranged with the supplier. The supplier will be on-site to
complete the modification and review the ASP operation.
|
|
VOCs (including methane) (b)
|
0 – 3,195
|
20
|
Identified (f)
|
Modification of
the ASP is being arranged with the supplier. The supplier will be on-site to
complete the modification and review the ASP operation.
|
|
NH3
|
0 – 1,016
|
35
|
Identified (g)
|
Modification of
the ASP is being arranged with the supplier. The supplier will be on-site to
complete the modification and review the ASP operation.
|
|
HCl
|
0 – 9
|
10
|
Nil
|
Nil
|
|
HF
|
0 – 1.0
|
1
|
Nil
|
Nil
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 11% and dry basis.
(b) The VOCs emission limit
include methane as biogas is adopted as fuel in the combustion process.
(c) One exceedance on Carbon
Monoxide was recorded on 20 August 2019.
(d) Dates with exceedances on NOx
(number of exceedances on the day) were identified on 1 (1), 2 (4), 3 (3), 4
(9), 5 (3), 6 (12), 7 (7), 8 (1), 11 (6), 16 (2) and 20 (1) August 2019.
(e) Dates with exceedances on SO2 (number of exceedances on
the day) were identified on 6 (1) and 20 (2) August 2019.
(f) Dates with exceedances on VOCs (including methane) (number of exceedances on
the day) were identified on 6 (3), 8 (2) and 20 (4) August 2019.
(g) Dates with exceedances on
NH3 (number of exceedances on the day) were identified on 5 (11),
6 (8), 8 (3), 9 (5), 10 (16), 11 (9), 13 (12), 16 (2) and 20 (2) August 2019.
|
4.2
Odour
No
odour patrol was required to be conducted for this reporting period.
Odour patrol was conducted by the
independent odour patrol team of ALS Technichem (HK) Pty Ltd on 6 August 2019.
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
K.
No effluent was discharged from the
construction activity in the reporting month, hence it was not necessary to
carry out effluent discharge sampling for this reporting period.
Effluent discharge was sampled monthly
from the Effluent Storage Tank as stipulated in the operation phase discharge
licence. The results of the discharge sample is recorded in Table 4.6.
Table 4.6 Results of the Discharge Sample
|
Parameters
|
Discharged
Effluent Concentration (mg/L)
|
Discharge
Limit (mg/L)
|
Compliance
with Discharge Limit
|
|
pH (pH units)
|
6.05 – 9.51
|
6-10 (a)
|
Yes
|
|
Suspended
Solids (b)
|
201
|
800
|
Yes
|
|
Biochemical
Oxygen Demand (5 days, 20°) (b)
|
111
|
800
|
Yes
|
|
Chemical Oxygen
Demand (b)
|
816
|
2,000
|
Yes
|
|
Oil &
Grease (b)
|
<5
|
40
|
Yes
|
|
Total Nitrogen (b)
|
49.4
|
200
|
Yes
|
|
Total
Phosphorus (b)
|
24.4
|
50
|
Yes
|
|
Surfactants
(total) (b)
|
<1.0
|
25
|
Yes
|
|
Notes:
(a) Daily Average.
(b) Effluent sample collected
on 24 August 2019.
|
No exceedance of discharge limit was
recorded during the reporting period.
Wastes generated from this Project
include inert construction and demolition (C&D) materials (public fill) and
non-inert C&D materials (construction waste). Construction waste comprises
general refuse, metals and paper/cardboard packaging materials. Metals
generated from the construction of the Project are also grouped into
construction waste as the materials were not disposed of with others at public
fill. Reference has been made to the Monthly Summary Waste Flow Table prepared
by the Contractor (see Annex H).
With reference to the relevant handling records and trip tickets of this
Project, the quantities of different types of waste generated in the reporting
month are summarised in Table 4.7.
Table 4.7 Quantities of Waste Generated
from the Construction of the Project
|
Month /
Year
|
Quantity
|
|
|
Total Inert C&D Materials
Generated (a)
|
Non-inert C&D Materials (b)
|
|
C&D Materials Recycled (c)
|
C&D Waste Disposed of at Landfill (d)
|
Chemical Waste
|
|
August 2019
|
15.19 tonnes
|
0.00 kg
|
9.73 tonnes
|
0.00 L
|
|
Notes:
(a) Inert C&D materials
(public fill) include bricks, concrete, building debris, rubble and excavated
spoil. In total, 15.19 tonnes of inert C&D material were generated from
the Project. The detailed waste flow is presented in Annex H.
(b) Non-inert C&D materials
(construction wastes) include metals, paper / cardboard packaging waste,
plastics and other wastes such as general refuse. Metals generated from the
Project were grouped into construction wastes as the materials were not
disposed of with others at the public fill.
(c) 0.00 kg of metals, 0.00 kg of papers/ cardboard packing and 0.00 kg of plastics were sent to recyclers for
recycling during the reporting period.
(d) Construction wastes other than metals,
paper/cardboard packaging, plastics and chemicals were disposed of at NENT
Landfill by subcontractors.
|
Wastes generated from the operation of
the Project include chemical waste, wastes generated from pre-treatment process
and general refuse (). Reference has
been made to the Monthly Summary Waste Flow Table prepared by the Contractor (see
Annex H). With
reference to the relevant handling records and trip tickets of this Project,
the quantities of different types of waste generated from the operation of the
Project in the reporting month are summarised in Table 4.8.
Table 4.8 Quantities of Waste Generated
from the Operation of the Project
|
Month /
Year
|
Chemical Waste
|
Waste Generated from
Pre-treatment Process
|
General Refuse
|
|
|
Disposal of at CWTC
|
Disposed of at Landfill (a)
|
Recycled (b)
|
Disposed of at Landfill (a)
|
Recycled (c)
|
|
August 2019
|
40 L
|
441.05 tonnes
|
0.00 tonnes
|
3.11 tonnes (d)
|
0 kg
|
|
Notes:
(a) Waste generated from
pre-treatment process and general refuse other than chemical waste and recyclables
were disposed of at NENT landfill by sub-contractors.
(b) Among waste generated from
pre-treatment process, 0.00 kg of metals, 0.00 kg of papers/ cardboard packing and 0.00 kg of plastics were sent to recyclers for
recycling during the reporting period.
(c) Among general refuse, 0.00
kg of metals, 0.00 kg of papers/
cardboard packing and
0.00 kg of plastics were
sent to recyclers for recycling during the reporting period.
(d) It was assumed that four
240-litre bins filled with 80% of general refuse were collected at each
collection. The general refuse density was assumed to be around 0.15 kg/L.
|
5
Site Audit
5.1
Environmental Site
Audit
Joint
site inspections were conducted by representatives of the Contractor and the ET
on 9, 14, 21 and 29 August 2019 as required for the construction of the
Project. The
IEC and ER were present at the joint inspection on 14 August 2019.
The
audits checked the implementation of the recommended mitigation measures for
air quality, landscape and visual, water quality, waste (land contamination)
and hazard-to-life stated in the Implementation Schedule (see Annex F).
Follow-up
actions resulting from the last site inspections were generally taken as
reported by the Contractor.
Key observations during
the reporting period are summarised as follows:
9
August 2019
·
No
particular observation during this inspection.
14
August 2019
·
Concrete
drilling was performed without water spraying. The Contactor was advised to
spray water regularly for dust control. Chemical need to be
·
Chemical
containers were observed without drip tray. The Contractor was reminded to
provide trip try or move the chemical containers to designated storage area
according to the Code of Practice.
21
August 2019
·
No
particular observation during this inspection.
29
August 2019
·
No
particular observation during this inspection.
Other than the above observation, the
Contractor has implemented environmental mitigation measures recommended in the
approved EIA Report and EM&A Manual.
The
monthly inspection of the landscape and visual mitigation measures for the operation
phase of the Project on 14 August 2019 covered the operation phase
environmental site audit. Joint site inspections was conducted by
representatives of the Contractor, ER, IEC and the MT on 14 August 2019 as
required for the operation of the Project.
The
audits checked the implementation of the recommended mitigation measures for
air quality, landscape and visual, water quality, waste (land contamination)
and hazard-to-life stated in the Implementation Schedule (see Annex F).
Follow-up
actions resulting from the last site inspections were generally taken as
reported by the Contractor.
Key observations during
the reporting period are summarised as follows:
14
August 2019
·
No
particular observation during this inspection.
Other than the above observations, the
Contractor has implemented environmental mitigation measures recommended in the
approved EIA Report and EM&A Manual.
Inspection of the landscape and visual
mitigation measures for the construction phase of the Project was performed on 14
and 29 August 2019. Inspection of the landscape and visual
mitigation measures for the operation phase of the Project was performed on 14 August
2019.
It was confirmed that the
necessary landscape and visual mitigation measures during the construction and
operation phase as summarised in Annex
F were generally implemented by the Contractor. No specific
observation was found during site inspections on 14 and August 2019. No non-compliance in
relation to the landscape and visual mitigation measures was identified during
the site audits in this reporting period and therefore no further actions are
required. The ET/MT will keep track of the EM&A programme to check
compliance with environmental requirements and the proper implementation of all
necessary mitigation measures.
6
Environmental
Non-conformance and Deficiencies
Non-compliance of emission limits for CHP
and ASP were recorded during the reporting period.
The Contractor has reviewed the organic
waste treatment processes (i.e. waste reception, waste pre-treatment, anaerobic
digesters, and composting processes) and found that they were operated normally
during the reporting period. The Contractor has investigated air pollution
control system and the combustion system of the CHP and ASP and
identified the following potential causes for the exceedance.
(a) CHP
setting was undergoing fine-tuning for performance optimisation. Therefore, it
could not effectively remove Dust (or TSP), NOx, SO2, HCl
and HF at limited period of time which leads to the exceedance for Dust (or
TSP), NOx, SO2, HCl and HF limit for the CHP stacks.
(b) The
ongoing performance optimisation of the ASP result in the incomplete combustion
of biogas. The unstable emission leads to the exceedances of Carbon Monoxide, NOx,
SO2, VOCs (including methane) and NH3 in ASP.
For item (a), the supplier has been
conducting a detailed investigation of the remaining exceedance recorded on the
CHPs during this reporting period. The investigation is still ongoing. After
the investigation, the Contractor will perform the maintenance work according
to suggestions raised by the supplier in the next reporting period.
For item (b), it was arranged with the
supplier of the ASP to modify the system onsite. The supplier suggested that main
components required for the modification work, i.e. an air cooler, will be
delivered to Hong Kong by early October 2019. Meanwhile, the supplier has
performed some minor modification work, such as the replacement of control
valves. The Contractor is developing a detailed schedule with the supplier to
ensure preparatory works are completed for the major modification work to take
place. The operation team of the Contractor will also liaise and agree with
the supplier for any shutdown period required to replace and install the
equipment.
The investigation report is presented in
Annex J.
The Contractor reported that an incident
related to the release of biogas occurred on 25 August 2019. The investigation
report is presented in Annex J.
No complaint was received
during the reporting period.
No summon/prosecution was
received during the reporting period. The cumulative summons/prosecution log
is shown in Annex I.
7
Future
Key Issues
Activities to be undertaken
for the coming reporting period are:
·
Operation
of the Project.
·
Continue
construction of the Visitor Centre.
8
Conclusions
This EM&A Report presents the
EM&A programme undertaken during the reporting period from 1 to 31
August 2019 in accordance with EM&A Manual (Version E) and requirements
of EP (FEP-01/395/2010/C).
No air quality, noise and water quality
monitoring is required under the construction EM&A requirements.
For the operation phase, exceedances of
the emission limits for stack monitoring (including 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
|
|
Cogeneration
Unit (CHP)
|
· Exceeded emission limit of
Dust (or TSP) on 29 August 2019
· Exceeded emission limit of
NOx on 2, 4, 5, 22, 23, 24, 30 and 31 2019
· Exceeded emission limit of
SO2 on 6, 22, 30 and 31 August 2019
· Exceeded emission limit of
HCl on 30 August 2019
· Exceeded emission limit of HF
on 30 August 2019
|
|
Ammonia
Stripping Plant (ASP)
|
· Exceeded emission limit of
Carbon Monoxide on 20 August 2019
· Exceeded emission limit of
NOx on 1, 2, 3, 4, 5, 6, 7, 8, 11, 16 and 20 August 2019
· Exceeded emission limit of
SO2 on 6 and 20 August 2019
· Exceeded emission limit of
VOCs (including methane) on 6, 8 and 20 August 2019
· Exceeded emission limit of
NH3 on 5, 6, 8, 9, 10, 11, 13, 16 and 20 August 2019
|
Exceedances in emission
parameters of CHP and ASP were found to be a result of problems with the continuous
fine-tuning of CHP and ASP setting.
The
Contractor has implemented mitigation measures to control the exceedance
(including the fine-tuning of emission control for CHP; and the modification of
the ASP to optimise overall performance).
Odour patrol was conducted in
accordance to the EM&A requirements. No exceedance of odour intensity
limit for the odour patrol.
No
non-compliance to the effluent discharge limit was recorded during this
reporting period.
The
environmental control /mitigation measures related to air quality, water quality,
waste (including land contamination prevention), hazard-to-life and landscape
and visual recommended in the approved EIA Report and the EM&A Manual were
properly implemented by the Contractor during the reporting month.
Bi-weekly landscape
and visual monitoring were conducted in the reporting period. The necessary
landscape and visual mitigation measures recommended in the approved EIA Report
were generally implemented by the Contractor.
An incident related to the
release of biogas occurred on 25 August 2019.
No complaint/summon/prosecution
was received.
