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 Operation Phase Monitoring
4.3 Water
Quality
4.3.1 Operation Phase Monitoring
4.4 Waste
Management
4.4.1 Operation Phase Monitoring
5 Site Audit
5.1 Environmental
Site Audit
5.1.1 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
4.7Quantities 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 59th monthly Environmental Monitoring and Audit
(EM&A) report presenting the EM&A works carried out during the period
from 1 to 30 April 2020 in accordance with the EM&A Manual. Substantial
completion of the construction works was confirmed on 3 December 2018. In the
meantime, the operation phase EM&A programme had commenced in March 2019. Substantial
Completion in respect of substantial part of the Works was confirmed on 24
February 2020. The construction phase EM&A programme was completed in the
end of February 2020.
Summary of Works undertaken
during the Reporting Month
Works undertaken in the reporting month
included:
·
Operation
of the Project, including organic waste reception, and operation of the pre-treatment
facilities, anaerobic digesters, composting facilities, air pollution control
systems, on-line emission monitoring system for the Centralised Air Pollution
Control Unit (CAPCS), Co-generation Units (CHP)s and Ammonia Stripping Plant (ASP),
and the wastewater treatment plant; and
·
Process
fine-tune, including adjustment of the ASP with new treatment media,
modification of Continuous Environmental Monitoring System (CEMS) and
Supervisory Control and Data Acquisition System (SCADA) rectification and
improvement works following equipment failures and the alteration of different
operation modes and measures to adapt to the high variation of SSOW nature and
sources.
Environmental Monitoring and
Audit Progress
Air Quality Monitoring
Exceedances on Odour
(including NH3 & H2S) from CAPCS, NOx, and VOCs (including
methane) from CHP and Carbon Monoxide, NOx, VOCs (including
methane), NH3 and HF from ASP
were recorded on the on-line monitoring system. It should be noted that measurements
recorded under abnormal operating conditions, e.g. start up and stopping of
stacks, unstable operation, test runs and interference of sensor, are disregarded.
Exceedances in emission parameters of CAPCS,
CHP and ASP were found to be a result of problems with the continuous
fine-tuning of CAPCS and CHP settings, and the incomplete thermal combustion of
the thermal combustion unit of the ASP.
The Contractor has
implemented mitigation measures to control the exceedance (including the
re-adjustment of CAPCS and CHP; and tuning the thermal combustion unit of the
ASP to optimise combustion efficiency and overall performance).
The Contractor is recommended to closely
monitor the processes of the modification of the ASP and the post-modification
monitoring of emission level to avoid any exceedance.
Water Quality
No non-compliance
to the effluent discharge limit stipulated in the discharge licence issued by
the EPD under the Water Pollution Control Ordinance was recorded during
this reporting period.
Waste Management
Waste generated from the operation of
the Project includes chemical waste, waste generated from pre-treatment process
and general refuse.
0 L of chemical waste was collected by
licenced waste collector from the operation of the Project.
363.92 tonnes of waste generated from
pre-treatment process from the operation of the Project was disposed of at
landfill. Among the recyclable waste generated from pre-treatment process from
the operation of the Project, 0.00 kg of metals, 0.00 kg of papers/ cardboard
packing and 0.00 kg of plastics were sent to recyclers for recycling during the
reporting period.
Around 2.42 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
|
1
time
|
1 monthly 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 23 April
2020. The
environmental control/ mitigation measures (related to air quality, water
quality, waste (including land contamination prevention), hazard-to-life and
landscape and visual) recommended in the approved EIA Report and the EM&A
Manual were properly implemented by the Contractor during the reporting month.
Environmental
Exceedance/Non-conformance/Compliant/Summons and Prosecution
Exceedances for the air
emission limits for the CAPCS, CHP and ASP stacks were recorded during the
reporting period.
No complaint/ summon/prosecution was
received in this reporting period.
Future Key Issues
Activities to be undertaken in the next
reporting month include:
·
Operation
of the Project.
·
Modification
of the ASP to control the air emission.
1
Introduction
ERM-Hong Kong, Limited (ERM) was
appointed by OSCAR Bioenergy Joint Venture (the Contractor) as the Environmental
Team (ET) to undertake the construction Environmental Monitoring and Audit
(EM&A) programme for the Contract No. EP/SP/61/10 of Organic Waste
Treatment Facilities Phase I, which the project name has been updated
to Organic Resources Recovery Centre (Phase I) (the
Project)
since November
2017. ERM was also
appointed by the Contractor to undertake the operation EM&A programme
starting 1 March 2019.
This is the 59th EM&A
report which summarises the monitoring results and audit findings for the
EM&A programme during the reporting period from 1 to 30 April 2020.
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
construction phase EM&A programme was completed in the end of February
2020.
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.
Table
2.1 Summary of Activities Undertaken
in the Reporting Period
|
Activities Undertaken in the
Reporting Period
|
|
·
Systems being operated – waste reception,
pre-treatment, CAPCS extraction, the digesters, the centrifuge, , the
composting tunnels the desulphurisation, the emergency flare, the CHPs, the
ASP and the biological waste water treatment plant (about 100-130 t/d SSOW
input); and
·
Process fine-tune – adjustment of the ASP
operational parameters with new treatment media, CEMS/SCADA modification and
improvement work following equipment failures and the alteration of different
operation modes and measures to adapt to the high variation of SSOW nature
and sources.
|
2.4
Project Organisation
and Management Structure
The project organisation chart and
contact details are shown in Annex B.
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
|
|
Effluent
Discharge License
|
WT00024352-2016
|
3 June
2016 – 30 June 2021
|
Approved
on 3 June 2016
|
|
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. Although water quality monitoring is not
required for the operation phase under the EM&A programme, there are water
quality monitoring requirement under the Water Discharge Licence of the plant
under the Water Pollution Control Ordinance (WPCO). As part of this
EM&A programme, the monitoring results will be reviewed to check the
compliance with the WPCO requirements.
3.1.1
Air
Quality
According to the EM&A Manual and EP
requirements, stack monitoring are required during the commissioning and operation
phase of the Project.
On-line monitoring (using continuous
environmental monitoring system (CEMS) shall be carried out for the centralised
air pollution unit (CAPCS), cogeneration units (CHP) and the ammonia stripping
plant (ASP) during the commissioning and operation phase. The calibration
certificate for the on-line monitoring equipment is provided in Annex C.
The monitoring data is transmitted
instantaneously to EPD (Regional Office) by telemetry system.
When the on-line monitoring for certain
parameter cannot be undertaken, monitoring will be carried out using the
following methodology approved by the EPD.
Table 3.1 Sampling and Laboratory Analysis
Methodology
|
Parameters
|
Method
|
Stacks to
be Monitored
|
|
Gaseous and
vaporous organic substances (including methane)
|
USEPA
Method 18
|
· CAPCS
· CHP
· ASP
|
|
Particulate
|
USEPA
Method 5
|
· CAPCS
· CHP
· ASP
|
|
Carbon monoxide
(CO)
|
USEPA Method 10
|
· CHP
· ASP
|
|
Nitrogen
oxides (NOx)
|
USEPA
Method 7E
|
· CHP
· ASP
|
|
Sulphur
dioxide (SO2);
|
USEPA
Method 6
|
· CHP
· ASP
|
|
Hydrogen
chloride (HCl)
|
USEPA
Method 26A
|
· CHP
· ASP
|
|
Hydrogen
fluoride (HF)
|
USEPA
Method 26A
|
· CHP
· ASP
|
|
Oxygen
(O2);
|
USEPA
Method 3A
|
· CAPCS
· CHP
· ASP
|
|
Velocity
and Volumetric Flow
|
USEPA
Method 2
|
· CAPCS
· CHP
· ASP
|
|
Ammonia
(NH3)
|
USEPA CTM
027
|
· ASP
|
|
Odour
(including NH3 and H2S)
|
EN 13725
|
· CAPCS
|
|
Water
vapour content (continuous measurement of the water vapour content should not
be required if the sample exhaust gas is dried before the emissions are
analysed)
|
USEPA
Method 4
|
· CAPCS
· CHP
· ASP
|
|
Temperature
|
USEPA
Method 4
|
· CAPCS
· CHP
· ASP
|
With reference to the EM&A Manual, the
air emission of the stacks shall meet the following emission limits as
presented in Tables 3.2 to 3.5.
Table 3.2 Emission Limit for CAPCS Stack
|
Parameter
|
Emission
Level (mg/Nm3) (a)
|
|
VOCs (including
methane)
|
680
|
|
Dust
(or Total Suspended Particulates
(TSP))
|
6
|
|
Odour (including NH3 & H2S)
|
220 (b)
|
|
Notes:
(a) Hourly average
concentration
(b) The odour unit is OU/Nm3
|
Table 3.3 Emission Limit for CHP Stack
|
Parameter
|
Maximum
Emission Level (mg/Nm3) (a) (b)
|
|
Dust
(or Total Suspended Particulates)
|
15
|
|
Carbon
Monoxide
|
650
|
|
NOx
|
300
|
|
SO2
|
50
|
|
NMVOCs (c)
|
150
|
|
VOCs (including methane) (d)
|
1,500
|
|
HCl
|
10
|
|
HF
|
1
|
|
Notes:
(a)
All values refer to an oxygen content in the exhaust gas of 6% and dry basis.
(b)
Hourly average concentration
(c)
NMVOCs should be monitored by gas sampling and laboratory analysis at an
agreed interval. For the first 12 months (starting from August 2019),
monitoring should be carried out at quarterly intervals. The monitoring
frequency should then be reduced to half-yearly for next 12 months (starting
from August 2020).
(d)
The VOCs emission limit include methane as biogas is adopted as fuel in the
combustion process.
|
Table
3.4 Emission Limit for ASP Stack
|
Parameter
|
Maximum
Emission Level (mg/Nm3) (a) (b)
|
|
Dust
(or Total Suspended Particulates)
|
5
|
|
Carbon
Monoxide
|
100
|
|
NOx
|
200
|
|
SO2
|
50
|
|
VOCs (including methane) (c)
|
20
|
|
NH3
|
35
|
|
HCl
|
10
|
|
HF
|
1
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 11% and dry basis.
(b) Hourly average
concentration
(c) The VOCs emission limit
include methane as biogas is adopted as fuel in the combustion process.
|
Table 3.5 Emission Limit for Standby
Flaring Gas Unit ([2])
|
Parameter
|
Maximum
Emission level (mg/Nm3) (a) (b)
|
|
Dust (or Total
Suspended Particulates)
|
5
|
|
Carbon Monoxide
|
100
|
|
NOx
|
200
|
|
SO2
|
50
|
|
VOCs (including
methane) (c)
|
20
|
|
HCl
|
10
|
|
HF
|
1
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 11% and dry basis.
(b) Hourly average
concentration
(c) The VOCs emission limit
include methane as biogas is adopted as fuel in the combustion process.
|
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
operation phase of the Project are recommended in the approved EIA Report and
EM&A Manual and are summarised in Annex D. Monthly site audits for operation phase will
be carried out to check the implementation of these measures.
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.
For operation phase, site inspection
shall be conducted once a month for the first year of operation of the
Project. All measures as stated in the implementation schedule of the EM&A
Manual (see Annex
D), including compensatory planting, undertaken by both the Contractor
and the specialist Landscape Sub-Contractor during the first year of the
operation phase shall be audited by a Registered Landscape Architect (RLA) to
ensure compliance with the intended aims of the measures and the effectiveness
of the mitigation measures. After the one-year maintenance period, the
landscape maintenance and monitoring shall be carried out by the Contractor.
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 commissioning
phase EM&A programme.
The concentrations of concerned air
pollutants emitted from the stacks of the CAPCS, CHP, and ASP during the
reporting period are monitored on-line by the continuous environmental
monitoring system (CEMS). During the reporting period, there is no need to
operate the standby flare and therefore no monitoring of the flare stack was
undertaken.
With reference to the emission limits shown
in Tables 3.2, 3.3 and 3.4, the hourly average concentrations and
the number of exceedances of the concerned air emissions monitored for the
CAPCS, CHP and ASP during this reporting period are presented in Tables 4.1
to 4.5.
It should be noted that measurements
recorded under abnormal operating conditions, e.g. start up and stopping of
stacks, unstable operation, test runs and interference of sensor, are disregarded.
Table 4.1 Hourly Average of Parameters
Recorded for CAPCS
|
Parameter
|
Range of
Hourly Average Conc. (mg/Nm3)
|
Emission
Limit (mg/Nm3)
|
Exceedance
Identified
|
Remarks
|
|
VOCs (including
methane)
|
0 – 0
|
680
|
Nil
|
Nil
|
|
Dust
(or TSP)
|
0.2 – 3.2
|
6
|
Nil
|
Nil
|
|
Odour (including NH3 & H2S) (a)
|
0 – 337
|
220
|
Identified (b)
|
CAPCS was under
maintenance.
|
|
Notes:
(a)
The
odour unit is OU/Nm3.
(b)
Dates
with exceedances on Odour (including NH3 & H2S) (number of exceedances on the day)
were identified on 9 (3) and 17 (4) April 2020.
|
Table 4.2 Hourly Average of Parameters
Recorded for CHP
1
|
Parameter
|
Range
of Hourly Average Conc. (mg/Nm3) (a)
|
Max.
Emission Limit (mg/Nm3)
|
Exceedance
Identified
|
Remarks
|
|
Dust
(or TSP)
|
0
– 14
|
15
|
Nil
|
Nil
|
|
Carbon
Monoxide
|
0
– 448
|
650
|
Nil
|
Nil
|
|
NOx
|
0
– 352
|
300
|
Identified (d)
|
Supplier
had been arranged to check the performance of the CHP and maintenance will be
arranged after detailed investigation.
|
|
SO2
|
0
– 42
|
50
|
Nil
|
Nil
|
|
NMVOCs (b)
|
Nil
|
150
|
Nil
|
Nil
|
|
VOCs (including methane) (c)
|
0
– 1,809
|
1,500
|
Identified (e)
|
Supplier
had been arranged to check the performance of the CHP and maintenance will be
arranged after detailed investigation.
|
|
HCl
|
0
– 8
|
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 CHP 1 as biogas production rate could not sustain the operation of the CHP
stack for the scheduled sampling on 11 February 2020.
(c) The VOCs
emission limit include methane as biogas is adopted as fuel in the combustion
process.
(d) One exceedance on NOx
was identified on 15 April 2020.
(e) Dates with exceedances on VOCs
(including methane) (number of exceedances on the day) were identified on 14
(1) and 15 (2) April 2020.
|
Table
4.3 Hourly Average of Parameters
Recorded for CHP 2
|
Parameter
|
Range
of Hourly Average Conc. (mg/Nm3) (a) (b)
|
Max.
Emission Limit (mg/Nm3)
|
Exceedance
Identified
|
Remarks
|
|
Dust
(or TSP)
|
0
– 10
|
15
|
Nil
|
Nil
|
|
Carbon
Monoxide
|
0
– 97
|
650
|
Nil
|
Nil
|
|
NOx
|
0
– 362
|
300
|
Identified (d)
|
Supplier
had been arranged to check the performance of the CHP and maintenance will be
arranged after detailed investigation.
|
|
SO2
|
0
– 48
|
50
|
Nil
|
Nil
|
|
NMVOCs (b)
|
Nil
|
150
|
Nil
|
Nil
|
|
VOCs (including methane) (c)
|
0
– 1,407
|
1,500
|
Nil
|
Nil
|
|
HCl
|
0
– 1
|
10
|
Nil
|
Nil
|
|
HF
|
0
– 1.0
|
1
|
Nil
|
Nil
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 6%
and dry basis.
(b) No sampling was undertaken
at CHP 2 as biogas production rate could not sustain the operation of the CHP
stack for the scheduled sampling on 11 February 2020.
(c) The VOCs
emission limit include methane as biogas is adopted as fuel in the combustion
process.
(d) Dates with exceedances on
NOx (number of exceedances on the day) were identified on 9 (1),
14 (3), 18 (7), 19 (1), 20 (8), 21 (21), 24 (4), 29 (7) and 30 (5) April
2020.
|
Table
4.4 Hourly Average of Parameters
Recorded for CHP 3
|
Parameter
|
Range
of Hourly Average Conc. (mg/Nm3) (a)
|
Max.
Emission Limit (mg/Nm3)
|
Exceedances
Identified
|
Remarks
|
|
Dust
(or TSP)
|
0
– 9
|
15
|
Nil
|
Nil
|
|
Carbon
Monoxide
|
0
– 248
|
650
|
Nil
|
Nil
|
|
NOx
|
0
– 397
|
300
|
Identified (d)
|
Supplier
had been arranged to check the performance of the CHP and maintenance will be
arranged after detailed investigation.
|
|
SO2
|
0
– 43
|
50
|
Nil
|
Nil
|
|
NMVOCs (b)
|
Nil
|
150
|
Nil
|
Nil
|
|
VOCs (including methane) (c)
|
0
– 1,566
|
1,500
|
Identified (e)
|
Supplier
had been arranged to check the performance of the CHP and maintenance will be
arranged after detailed investigation.
|
|
HCl
|
0
– 3
|
10
|
Nil
|
Nil
|
|
HF
|
0
– 1.0
|
1
|
Nil
|
Nil
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 6%
and dry basis.
(b) Quarterly sampling of
NMVOCs was conducted in CHP3 on 11 February 2020. The hourly average
concentration for NMVOCs was 3.3 mg/Nm3. No exceedance was
identified.
(c) The VOCs
emission limit include methane as biogas is adopted as fuel in the combustion
process.
(d) Dates with exceedances on
NOx (number of exceedances on the day) were identified on 4 (9), 5
(18), 6 (12), 7 (1), 8 (2), 9 (11), 13 (3) and 23 (1) April 2020.
(e) One exceedance on VOCs
(including methane) was identified on 23 April 2020.
|
Table
4.5 Hourly Average of Parameters
Recorded for ASP
|
Parameter
|
Range of Hourly Average Conc. (mg/Nm3) (a)
|
Max.
Emission Limit (mg/Nm3)
|
Exceedances
Identified
|
Remarks
|
|
Dust
(or TSP)
|
0.0 – 2.5
|
5
|
Nil
|
Nil
|
|
Carbon
Monoxide
|
0 – 267
|
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 – 377
|
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 – 27
|
50
|
Nil
|
Nil
|
|
VOCs (including methane) (b)
|
0 – 65
|
20
|
Identified (e)
|
Modification of
the ASP is being arranged with the supplier. The supplier will be on-site to
complete the modification and review the ASP operation.
|
|
NH3
|
0 – 242
|
35
|
Identified (f)
|
Modification of
the ASP is being arranged with the supplier. The supplier will be on-site to
complete the modification and review the ASP operation.
|
|
HCl
|
0 – 10
|
10
|
Nil
|
Nil
|
|
HF
|
0 – 1.5
|
1
|
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.
|
|
Notes:
(a) All values refer to an
oxygen content in the exhaust gas of 11% and dry basis.
(b) The VOCs emission limit
include methane as biogas is adopted as fuel in the combustion process.
(c) 1 exceedance on Carbon
Monoxide (number of exceedances on the day) was identified on 2 April 2020.
(d) Dates with exceedances on
NOx (number of exceedances on the day) were identified on 1 (3), 2
(1), 3 (3), 4 (7), 8 (4), 9 (1) 15 (2), 16 (2), 22 (1) and 30 (1) April 2020.
(e) Dates with exceedances on VOCs
(including methane) (number of exceedances on the day) were identified on 2
(1), 8 (1) and 22 (1) April 2020.
(f) Dates with exceedances on NH3
(number of exceedances on the day) were identified on 1 (5), 2 (17), 3 (13),
4 (7), 10 (1), 16 (3), 19 (4), 20 (2), 22 (1), 23 (5), 24 (1), 25 (1) and 26
(5) April 2020.
(g) One exceedances on HF was
identified on 7 April 2020.
|
4.2
Odour
No odour patrol was required to be
conducted for this reporting period.
Effluent discharge was sampled monthly
from the Effluent Storage Tank as stipulated in the operation phase discharge
licence. The results of the discharge sample is recorded in Table 4.6.
Table 4.6 Results of the Discharge Sample
|
Parameters
|
Discharged
Effluent Concentration (mg/L)
|
Discharge
Limit (mg/L)
|
Compliance
with Discharge Limit
|
|
pH (pH units)
|
7.48 – 7.88
|
6-10 (a)
|
Yes
|
|
Suspended
Solids (b)
|
26
|
800
|
Yes
|
|
Biochemical
Oxygen Demand (5 days, 20°) (b)
|
11
|
800
|
Yes
|
|
Chemical Oxygen
Demand (b)
|
360
|
2,000
|
Yes
|
|
Oil &
Grease (b)
|
<5
|
40
|
Yes
|
|
Total Nitrogen (b)
|
32.7
|
200
|
Yes
|
|
Total
Phosphorus (b)
|
31.9
|
50
|
Yes
|
|
Surfactants
(total) (b)
|
<1.0
|
25
|
Yes
|
|
Notes:
(a) Daily Average.
(b) Effluent sample collected
on 8 April 2020.
|
No exceedance of discharge limit was
recorded during the reporting period.
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 E).
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 4.7.
Table 4.7 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)
|
|
April 2020
|
0 L
|
363.92 tonnes
|
0.00 tonnes
|
2.42 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
The
monthly inspection of the landscape and visual mitigation measures for the operation
phase of the Project on 23 April 2020 covered the operation
phase environmental site audit. Joint site inspections was conducted by
representatives of the Contractor, ER, IEC and the MT on 23 April 2020 as
required for the operation of the Project.
The
audits checked the implementation of the recommended mitigation measures for
air quality, landscape and visual, water quality, waste (land contamination)
and hazard-to-life stated in the Implementation Schedule (see Annex D).
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:
23
April 2020
·
No
particular observation during this inspection.
Other than the above observations, the
Contractor has implemented environmental mitigation measures recommended in the
approved EIA Report and EM&A Manual.
Inspection of the landscape and visual
mitigation measures for the operation phase of the Project was performed on 23 April 2020.
It was confirmed that the
necessary landscape and visual mitigation measures during the operation phase as
summarised in Annex
D were generally implemented by the Contractor. No specific
observation was found during site inspections on 23 April 2020. No non-compliance in
relation to the landscape and visual mitigation measures was identified during
the site audits in this reporting period and therefore no further actions are
required. The ET/MT will keep track of the EM&A programme to check
compliance with environmental requirements and the proper implementation of all
necessary mitigation measures.
6
Environmental
Non-conformance and Deficiencies
Non-compliance of emission limits for CAPCS,
CHP and ASP were recorded during the reporting period.
The Contractor has reviewed the organic
waste treatment processes (i.e. waste reception, waste pre-treatment, anaerobic
digesters, and composting processes) and found that they were operated normally
during the reporting period. The Contractor has investigated air pollution
control system and the combustion system of the CAPCS, CHP and ASP and
identified the following potential causes for the exceedance.
(a) The
CAPCS was undergoing fine-tuning for performance optimisation. As a result, it
could not effectively remove odorous gases (e.g. NH3 and H2S)
and caused exceedances of odour limits for the CAPCS;
(b) CHP
setting was undergoing fine-tuning for performance optimisation. Therefore, it
could not effectively remove NOx and VOCs (including methane) at a certain
period of time which leads to the exceedance for NOx and VOCs
(including methane) limit for the CHP stacks;
(c) 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,
VOCs (including methane), NH3 and HF in ASP.
For item (a) and (b), it was arranged
with the supplier of CAPCS and CHPs to check the performance of the stacks
onsite during the reporting period. However the supplier could not travel to
Hong Kong during this reporting period due to restrictive travel arrangement
during this reporting period. The supplier will conduct a detailed
investigation of the remaining exceedance recorded on the CAPCS and CHPs.
After the investigation, the Contractor will perform the maintenance work
according to suggestions raised by the supplier in the next reporting period.
For item (c), parts of the modification
works has been completed, with more components waiting to be delivered to Hong
Kong. The Contractor has scheduled the remaining modification work for the
next few reporting periods with schedule shutdown of the ASP to facilitate the
installation of equipment for performance optimisation.
The investigation report is presented in
Annex G.
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
F.
7
Future
Key Issues
Activities to be undertaken
for the coming reporting period are:
·
Operation
of the Project.
·
Modification
of the ASP to control the air emission.
8
Conclusions
This EM&A Report presents the
EM&A programme undertaken during the reporting period from 1 to 30
April 2020 in accordance with EM&A Manual (Version F) and requirements of
EP (FEP-01/395/2010/C).
For the operation phase, exceedances of
the emission limits for CAPCS, CHP and ASP stack monitoring were recorded under
normal operating conditions during the reporting period (see Table 8.1).
Table 8.1 Exceedances
for Stack Emissions
|
Stack
|
Exceedances
During the Reporting Period
|
|
Centralised Air
Pollution Control Unit (CAPCS)
|
· Exceeded emission limit of Odour (including NH3 & H2S) on 9 and 17 April 2020
|
|
Cogeneration
Unit (CHP)
|
· Exceeded emission limit of
NOx on 4, 5, 6, 7, 8, 9, 13, 14, 15, 18, 19, 20 ,21, 23, 24, 29
and 30 April 2020
· Exceeded emission limit of
VOCs (including methane) on 14, 15 and 23 April 2020
|
|
Ammonia
Stripping Plant (ASP)
|
· Exceeded emission limit on
Carbon Monoxide on 4 and 2 April 2020
· Exceeded emission limit of
NOx on 1, 2, 3, 4, 8, 9, 15, 16, 22 and 30 April 2020
· Exceeded emission limit of
VOCs (including methane) on 2, 8 and 22 April 2020
· Exceeded emission limit of
NH3 on 1, 2, 3, 4, 10, 16, 19, 20, 22, 23, 24, 25 and 26 April
2020
· Exceeded emission limit of
HF on 7 April 2020
|
Exceedances in emission parameters of CAPCS,
CHP and ASP were found to be a result of the continuous fine-tuning of CAPCS, CHP
and ASP setting.
The Contractor has
implemented mitigation measures to control the exceedance, which is the modification
of the CAPCS, CHP and ASP to optimise overall performance.
No non-compliance to
the effluent discharge limit was recorded during this reporting period.
The environmental
control /mitigation measures related to air quality, water quality, waste
(including land contamination prevention), hazard-to-life and landscape and
visual recommended in the approved EIA Report and the EM&A Manual were
properly implemented by the Contractor during the reporting month.
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.
