Contents
Annex B project organisation chart with contact details
Annex C implementation schedule of mitigation measures
Annex E environmental complaint, environmental summons and prosecution log
List of Tables
Table 2.1 Summary of Activities Undertaken in the Reporting Period
Table 2.2 Summary of Environmental Licensing, Notification and Permit Status
Table 3.1 Sampling and Laboratory Analysis Methodology
Table 3.2 Emission Limit for CAPCS Stack
Table 3.3 Emission Limit for CHP Stack
Table 3.4 Emission Limit for ASP Stack
Table 3.5 Emission Limit for Standby Flaring Gas Unit ()
Table 3.6 Odour Intensity Level
Table 3.7 Action and Limit Levels for Odour Nuisance
Table 3.8 Event and Action Plan for Odour Monitoring
Table 3.9 Discharge Limits for Effluent from the Outlet Chamber of the Effluent Storage Tank
Table 3.10 Discharge Limits for Effluent from the Petrol Interceptors
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 4.5 Hourly Average of Parameters Recorded for ASP
Table 4.6 Hourly Average of Parameters Recorded for the Standby Flaring Gas Unit
Table 4.7 Results of the Discharge Sample from the Outlet Chamber of the Effluent Storage Tank
Table 4.8 Results of the Discharge Sample from the Petrol Interceptor 1
Table 4.9 Results of the Discharge Sample from the Petrol Interceptor 2
Table 4.10 Quantities of Waste Generated from the Operation of the Project
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 105th Monthly Environmental Monitoring and Audit (EM&A) report presenting the EM&A works carried out during the period from 1 to 29 February 2024 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.
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;
· Venturi scrubber fan No. 1 cleaned and all operational parameters checked;
· Venturi scrubber fan No. 2 cleaned and all operational parameters checked;
· Wet scrubber No. 1 cleaned and all operation parameters checked;
· Wet scrubber No. 2 opened and began cleaning before operation parameters can be checked; and
· ASP balancing valve replaced and a number of DN150 valves including cleaning of plate type and shell and tube type heat exchangers.
Non-compliance of emission limits of Odour from CAPCS; NOx and SO2 from CHP1; NOx and SO2 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 were recorded to be in compliance with discharge limits during the reporting period.
All analytes from the Petrol Interceptor 1 and Petrol Interceptor 2 sampling were recorded to be in compliance with discharge limits during the reporting period.
Waste generated from the operation of the Project includes chemical waste, waste generated from pre-treatment process and general refuse.
400L of chemical waste (spent lube oil) was disposed of at CWTC in February 2024.
901.23 tonnes of waste generated from pre-treatment process from the operation of the Project were disposed of at landfill. Among the waste generated from pre-treatment process from the operation of the Project, 0.000 tonnes of metals, 0.000 tonnes of papers/cardboard packing and 0.000 tonnes of plastics were sent to recyclers for recycling during the reporting period.
Around 2.534 tonnes of general refuse from the operation of the Project were disposed of at landfill. Among the general refuse from the operation of the Project, 0.005 tonnes of metals, 0.090 tonnes of papers/cardboard packing and 0.010 tonnes of plastics were sent to recyclers for recycling during the reporting period.
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 inspection was carried out by the representatives of the Contractor and the MT. The IEC was also present at the joint inspections on 27 February 2024. 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.
Exceedances for the air emission limits for CAPCS, CHPs, and ASP were recorded during the reporting period.
Five (5) Environmental Complaints regarding odour nuisance were received at the facility on 19 February 2024, 20 February 2024, 21 February 2024 (2 complaints), and 22 February 2024. Mitigation measures were implemented, daily odour patrols were arranged, and interim reports regarding the complaints received were submitted to EPD on 3 March 2024 and 8 March 2024. The full investigation reports of the Environmental Complaints are presented in Annex F.
Activities to be undertaken in the next reporting month include:
· Operation of the Project;
· Complete planned maintenance work of Wet scrubber No. 2;
· Focus on centrifuge area and polymer dosing system for the month;
· Focus on sieve fine plastic;
· Install new pipeline at leachate tank;
· Clean PST; and
· Install drum screen for IPS.
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 105th EM&A report which summarises the monitoring results and audit findings for the EM&A programme during the reporting period from 1 to 29 February 2024.
The structure of the report is as follows:
It details the scope and structure of the report.
It summarises the background and scope of the Project, site description, project organisation and status of the Environmental Permits (EP)/licences.
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.
It summarises monitoring results of the reporting period
It summarises the audit findings of the environmental as well as landscape and visual site audits undertaken within the reporting period.
It summarises any exceedance of environmental performance standard, environmental complaints and summons received within the reporting period.
It summarises the impact forecast for the next reporting month.
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 construction phase EM&A programme was completed in the end of February 2020. The operation phase of the EM&A programme commenced on 1 March 2019 ([1]).
The Project Site is located at Siu Ho Wan in North Lantau with an area of about 2 hectares. The layout of the Project Site is illustrated in Annex A. The facility received an average of 157.17 tonnes and treated an average of 126.09 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 cetrifugure, the composting tunnels, the de-sulphurisation, the standby flare, the CHPs, the ASP, and the biological wastewater treatment plant (157.17t/d SSOW received); · Venturi scrubber fan No. 1 cleaned and all operational parameters checked; · Venturi scrubber fan No. 2 cleaned and all operational parameters checked; · Wet scrubber No. 1 cleaned and all operation parameters checked; · Wet scrubber No. 2 opened and began cleaning before operation parameters can be checked; and · ASP balancing valve replaced and a number of DN150 valves including cleaning of plate type and shell and tube type heat exchangers. |
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 Licence |
WT00038391-2021 |
7 July 2021 – 30 June 2026 |
Approved on 7 July 2021 |
Chemical Waste Producer Registration |
WPN 5213-961-O2231-02 |
Throughout the implementation of the Project |
Approved on 10 November 2017 |
Waste Disposal Billing Account |
Account number: 702310 |
Throughout the Contract |
- |
The air quality (including odour) monitoring to be carried out during the commissioning and operation phase of the Project are described below. 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.
According to the EM&A Manual and EP requirements, stack monitoring is 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 (CHPs) and the ammonia stripping plant (ASP) during the commissioning and operation phase. The most recent sensor calibrations for the CAPCS system was carried out on 15 January 2024 for VOCs and 19 January 2024 for H2S. The most recent span calibrations for the CHPs CEMS systems were carried out from 26 to 28 September 2023. The most recent span calibrations for the ASP was carried out on 27 February 2024. Annual CAPCS CEMS calibration was carried out from 10 to 12 October 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 |
· ASP |
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). The monitoring of NMVOCs ended in August 2021. (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 ([3]).
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 by Person-in-charge of Odour Monitoring: |
Action by 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 weeks; 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 C. 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. As stipulated in the operation phase discharge licence, effluent discharge is to be sampled monthly from the outlet chamber of the Effluent Storage Tank, while effluent discharge is to be sampled bi-monthly from the Petrol Interceptors. 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 Outlet Chamber of the Effluent Storage Tank
Parameter |
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 Interceptors
Parameter |
Discharge Limit (mg/L) |
Flow Rate (m3/day) |
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 4.8 and Table 4.9. (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. |
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. After the one-year maintenance period, the landscape maintenance and monitoring shall be carried out by the Contractor.
The concentrations of concerned air pollutants emitted from the stacks of the CAPCS, CHPs, ASP, and the Standby Flaring Gas Unit during the reporting period are monitored on-line by the continuous environmental monitoring system (CEMS). During the reporting period, the Standby Flaring Gas Unit did not operate.
With reference to the emission limits shown in Tables 3.2, 3.3, 3.4, and 3.5, the hourly average concentrations and the number of exceedances of the concerned air emissions monitored for the CAPCS, CHPs, ASP and the Standby Flaring Gas Unit during this reporting period are presented in Tables 4.1 to 4.6.
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) |
0.00 – 404.14 |
680 |
Nil |
Nil |
Dust (or TSP) |
0.00 – 0.01 |
6 |
Nil |
Nil |
Odour (including NH3 & H2S) (b) |
0.00 – 1,181.75 |
220 |
Identified (c) |
System unstable (e.g., low efficiency, unstable column temperature) |
Notes: (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(2), 4(1), 5(16), 6(18), and 7(8) February 2024. |
Table 4.2 Hourly Average of Parameters Recorded for CHP 1
Parameter |
Range of Hourly Average Conc. (mg/Nm3) (a) |
Emission Limit (mg/Nm3) |
Exceedance Identified |
Remarks |
Dust (or TSP) |
0 - 10 |
15 |
Nil |
Nil |
Carbon Monoxide |
0 - 108 |
650 |
Nil |
Nil |
NOx |
0 – 527 |
300 |
Identified (c) |
System unstable (e.g., low efficiency, unstable column temperature) |
SO2 |
0 – 205 |
50 |
Identified (d) |
System unstable (e.g., low efficiency, unstable column temperature) |
VOCs (including methane) (b) |
0 – 1,258 |
1,500 |
Nil |
Nil |
HCl |
0 – 2 |
10 |
Nil |
Nil |
HF |
0 - 0 |
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 include methane as biogas is adopted as fuel in the combustion process. (c) Dates with NOx exceedances (number of exceedances on that day) were identified on 1(18), 2(20), 3(21), 4(22), 5(10), 6(24), 7(24), 8(11), 9(24), 10(24), 11(24), 12(24), 13(24), 14(24), 15(21), 16(24), 17(24), 18(24), 19(24), 20(24), 21(17), 22(8), 23(15), 24(19), 25(24), 26(24), 27(24), 28(24), and 29(23) February 2024. (d) Dates with SO2 exceedances (number of exceedances on that day) were identified on 1(18), 2(20), 3(21), 4(22), 5(10), 6(24), 7(24), 8(9), 9(21), 10(24), 11(24), 12(24), 13(24), 14(24), 15(18), 16(17), 17(23), 18(14), 19(11), 20(24), 21(17), 22(8), 23(15), 24(17), 25(21), 26(20), 27(23), 28(20), and 29(23) February 2024. |
Table 4.3 Hourly Average of Parameters Recorded for CHP 2
Parameter |
Range of Hourly Average Conc. (mg/Nm3) (a) |
Emission Limit (mg/Nm3) |
Exceedance Identified |
Remarks |
Dust (or TSP) |
0 - 3 |
15 |
Nil |
Nil |
Carbon Monoxide |
0 - 61 |
650 |
Nil |
Nil |
NOx |
0 – 439 |
300 |
Identified (c) |
System unstable (e.g., low efficiency, unstable column temperature) |
SO2 |
0 – 51 |
50 |
Identified (d) |
System unstable (e.g., low efficiency, unstable column temperature) |
VOCs (including methane) (b) |
0 – 1,006 |
1,500 |
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 6% 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 that day) were identified on 8(10), 9(19), 10(17), 11(14), 12(7), 13(10), 14(12), 15(1), 16(1), 18(6), 19(5), 21(1), 22)(7), 23(21), 24(12), 25(18), 26(2), 27(18), 28(23), and 29(15) February 2024. (d) Dates with SO2 exceedances (number of exceedances on that day) were identified on 10(1), 11(2), and 13(1) February 2024. |
Table 4.4 Hourly
Average of Parameters Recorded for CHP 3
Parameter |
Range of Hourly Average Conc. (mg/Nm3) (a) |
Emission Limit (mg/Nm3) |
Exceedance Identified |
Remarks |
Dust (or TSP) |
0 – 13 |
15 |
Nil |
Nil |
Carbon Monoxide |
0 – 137 |
650 |
Nil |
Nil |
NOx |
0 – 446 |
300 |
Identified (c) |
System unstable (e.g., low efficiency, unstable column temperature) |
SO2 |
0 – 181 |
50 |
Identified (d) |
System unstable (e.g., low efficiency, unstable column temperature) |
VOCs (including methane) (b) |
0 – 1,182 |
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 include methane as biogas is adopted as fuel in the combustion process. (c) Dates with NOx exceedances (number of exceedances on that day) were identified on 1(1), 5(4), 6(3), 10(1), 13(3), 14(2), 15(1), 16(1), 17(2), 18(16), and 26(5) February 2024. (d) Dates with SO2 exceedances (number of exceedances on that day) were identified on 1(5), 2(5), 3(3), 5(8), 6(11), 9(2), 10(2), 11(7), 12(6), 13(6), 14(6), 15(7), 16(5), 17(7), 18(10), 19(1), and 26(3) February 2024. |
Table 4.5 Hourly Average of Parameters Recorded for ASP
Parameter |
Range of Hourly Average Conc. (mg/Nm3) (a) |
Emission Limit (mg/Nm3) |
Exceedance Identified |
Remarks |
Dust (or TSP) |
0 – 0 |
15 |
Nil |
Nil |
Carbon Monoxide |
0 – 96 |
650 |
Nil |
Nil |
NOx |
0 – 1,087 |
300 |
Identified (c) |
System unstable (e.g., low efficiency, unstable column temperature) |
SO2 |
0 – 215 |
50 |
Identified (d) |
System unstable (e.g., low efficiency, unstable column temperature) |
VOCs (including methane) (b) |
0 – 0 |
1,500 |
Nil |
Nil |
NH3 |
0 – 193 |
35 |
Identified (e) |
System unstable (e.g., low efficiency, unstable column temperature) |
HCl |
0 – 1 |
10 |
Nil |
Nil |
HF |
0 – 0 |
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 include methane as biogas is adopted as fuel in the combustion process. (c) Dates with NOx exceedances (number of exceedances on that day) were identified on 1(8), 2(3), 3(7), 4(2), 5(4), 6(7), 8(3), 9(9), 10(23), 11(19), 12(14), 13(13), 14(17), 15(16), 16(16), 17(15), 18(18), 19(19), 20(22), 21(18), 22(9), 23(4), 24(5), 25(3), 26(5), 27(7), 28(11), and 29(17) February 2024. (d) Dates with SO2 exceedances (number of exceedances on that day) were identified on 1(6), 2(6), 3(5), 5(1), 6(23), 7(7), 8(4), 11(4), 12(2), 13(1), 14(1), 23(1), and 26(2) February 2024. (e) Dates with NH3 exceedances (number of exceedances on that day) were identified on 1(1), 2(3), 3(6), 4(7), 5(6), 8(3), 9(9), 14(2), 15(1), 16(2), 17(1), 23(12), 24(12), 25(3), 26(9), 27(3), 28(1), and 29(2) February 2024. |
Table 4.6 Hourly Average of Parameters Recorded for the Standby Flaring Gas Unit
Parameter |
Range of Hourly Average Conc. (mg/Nm3) (a) (c) |
Emission Limit (mg/Nm3) |
Exceedance Identified |
Remarks |
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 6% and dry basis. (b) The VOCs emission limit include methane as biogas is adopted as fuel in the combustion process. (c) The Standby Flaring Gas Unit did not operate during the reporting period. |
No odour patrol was required to be conducted for this reporting period.
Five (5) Environmental Complaints regarding odour nuisance were received at the facility on 19 February 2024, 20 February 2024, 21 February 2024 (2 complaints), and 22 February 2024. Mitigation measures were implemented, daily odour patrols were arranged, and interim reports regarding the complaints received were submitted to EPD on 3 March 2024 and 8 March 2024.
The full investigation reports of the Environmental Complaints are presented in Annex F.
Effluent discharge is sampled from the outlet chamber of the Effluent Storage Tank monthly and from the Petrol Interceptor(s) bi-monthly 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 and the results from the Petrol Interceptors are recorded in Tables 4.8 – 4.9.
Table 4.7 Results of the Discharge Sample from the Outlet Chamber of the Effluent Storage Tank
Parameter |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Flow Rate (m3/day) (a) |
27 - 259 (e) |
645 |
Yes |
pH (pH units) (b) |
7.60 – 8.40 (e) |
6 - 10 (c) |
Yes |
Suspended Solids (b) (d) |
138 (d) |
800 |
Yes |
Biochemical Oxygen Demand (5 days, 20°) (b) (d) |
18 (d) |
800 |
Yes |
Chemical Oxygen Demand (b) (d) |
659 (d) |
2,000 |
Yes |
Oil & Grease (b) (d) |
<5 (d) |
40 |
Yes |
Total Nitrogen (b) (d) |
99.4 (d) |
200 |
Yes |
Total Phosphorus (b) (d) |
18.4 (d) |
50 |
Yes |
Surfactants (total) (b) (d) |
1.3 (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 16 February 2024. (e) Data collected daily. |
Table 4.8 Results of the Discharge Sample from the Petrol Interceptor 1
Parameter |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Suspended Solids (b) |
<2 (a) |
30 |
- |
Chemical Oxygen Demand (c) |
<5 (a) |
80 |
- |
Oil & Grease (c) |
<5 (a) |
20 |
- |
Surfactants (total) (b) |
<1.0 (a) |
15 |
- |
Notes: (a) Petrol Interceptor 1 sample was collected on 21 February 2024. (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 4.9 Results of the Discharge Sample from the Petrol Interceptor 2
Parameter |
Discharged Effluent Concentration (mg/L) |
Discharge Limit (mg/L) |
Compliance with Discharge Limit |
Suspended Solids (b) |
11 (a) |
30 |
Yes |
Chemical Oxygen Demand (c) |
10 (a) |
80 |
Yes |
Oil & Grease (c) |
<5 (a) |
20 |
Yes |
Surfactants (total) (b) |
<1.0 (a) |
15 |
Yes |
Notes: (a) Petrol Interceptor 2 sample was collected on 7 February 2024. (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. |
Wastes generated from the operation of the Project include chemical waste, wastes generated from pre-treatment process and general refuse ([4]). Reference has been made to the Monthly Summary Waste Flow Table 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 month are summarised in Table 4.10.
Table 4.10 Quantities of Waste Generated from the Operation of the Project
Month / Year |
|||||
901.23 tonnes |
0.000 tonnes |
2.534 tonnes (e) |
0.105 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, 0.000 tonnes of metals, 0.000 tonnes of papers/cardboard packing and 0.000 tonnes of plastics were sent to recyclers for recycling during the reporting period. (c) Among general refuse, 0.005 tonnes of metals, 0.090 tonnes of papers/cardboard packing and 0.010 tonnes of plastics were sent to recyclers for recycling during the reporting period. (d) 400L of chemical waste (spent lube oil) was disposed of at CWTC in February 2024. (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. |
The monthly inspection for the operation phase of the Project on 27 February 2024 covered the operation phase environmental site audit. Joint site inspection was conducted by representatives of the Contractor, IEC, and the MT 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 C).
Key observations during the reporting period are summarised as follows:
27 February 2024
· Odour mitigation measures were observed being implemented at the Suspension Buffer Tank (SBT), including fans, deodourisers, and canvas barriers around the working area. During the sitewalk, the odour around the SBT tank was not any more noticeable than normal levels.
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 27 February 2024.
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 specific observation was found during the joint site inspection on 27 February 2024. No non-compliance in relation to the landscape and visual mitigation measures was identified during the site audits in this reporting period and therefore no further actions are required. The ET/MT will keep track of the EM&A programme to check compliance with environmental requirements and the proper implementation of all necessary mitigation measures.
Non-compliance of emission limits of Odour from CAPCS; NOx and SO2 from CHP1; NOx and SO2 from CHP2; NOx and SO2 from CHP3; and NOx, SO2, an NH3 from the 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 the de-sulphurisation system, CAPCS, CHPs, and the ASP; the potential causes for the exceedances were identified.
The investigation reports of the above exceedances are presented in Annex F.
Five (5) Environmental Complaints regarding odour nuisance were received at the facility on 19 February 2024, 20 February 2024, 21 February 2024 (2 complaints), and 22 February 2024. Mitigation measures were implemented, daily odour patrols were arranged, and interim reports regarding the complaints received were submitted to EPD on 3 March 2024 and 8 March 2024. The full investigation reports of the Environmental Complaints are presented in Annex F.
The full investigation reports of the above Environmental Complaints are presented in Annex F.
No summon/prosecution was received during the reporting period. The cumulative summons/prosecution log is shown in Annex E.
Activities to be undertaken for the coming reporting period are:
· Operation of the Project;
· Complete planned maintenance work of Wet scrubber No. 2;
· Focus on centrifuge area and polymer dosing system for the month;
· Focus on sieve fine plastic;
· Install new pipeline at leachate tank;
· Clean PST; and
· Install drum screen for IPS.
This EM&A Report presents the EM&A programme undertaken during the reporting period from 1 to 29 February 2024 in accordance with the EM&A Manual (Version F) and requirements of EP (FEP-01/395/2010/C).
For the operation phase, exceedances of the emission limits for the CAPCS, CHPs, and the 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 on 1, 4, 5, 6, and 7 February 2024. |
Cogeneration Unit 1 (CHP 1) |
· Exceeded emission limit of NOx on 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, and 29 February 2024. · Exceeded emission limit of SO2 on 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, and 29 February 2024. |
Cogeneration Unit 2 (CHP 2) |
· Exceeded emission limit of NOx on 8, 9, 10, 11, 12 13, 14, 15, 16, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, and 29 February 2024. · Exceeded emission limit of SO2 on 10, 11, and 13 February 2024. |
Cogeneration Unit 3 (CHP 3) |
· Exceeded emission limit of NOx on 1, 5, 6, 10, 13, 14, 15, 16, 17, 18, and 26 February 2024. · Exceeded emission limit of SO2 on 1, 2, 3, 5, 6, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 26 February 2024. |
Ammonia Stripping Plant (ASP) |
· Exceeded emission limit of NOx on 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, and 29 February 2024. · Exceeded emission limit of SO2 on 1, 2, 3, 5, 6, 7, 8, 11, 12, 13, 14, 23, and 26 February 2024. · Exceeded emission limit of NH3 on 1, 2, 3, 4, 5, 8, 9, 14, 15, 16, 17, 23, 24, 25, 26, 27, 28, and 29 February 2024. |
Non-compliance of emission limits of Odour from CAPCS; NOx and SO2 from CHP1; NOx and SO2 from CHP2; NOx and SO2 from CHP3; and NOx, SO2, and NH3 from the ASP were recorded during the reporting period. The exceedances of Odour from the CAPCS; NOx and SO2, from the CHPs; and the exceedances of NOx, SO2, and NH3 from the ASP occurred due to system instability.
All analytes from the outlet chamber of the effluent storage tank were recorded to be in compliance with discharge limits during the reporting period.
All analytes from the Petrol Interceptor 1 and Petrol Interceptor 2 sampling 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, CAPCS, CHPs, and the ASP; the potential causes for the exceedance were identified.
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.
Five (5) Environmental Complaints regarding odour nuisance were received at the facility on 19 February 2024, 20 February 2024, 21 February 2024 (2 complaints), and 22 February 2024. Mitigation measures were implemented, daily odour patrols were arranged, and interim reports regarding the complaints received were submitted to EPD on 3 March 2024 and 8 March 2024. The full investigation reports of the Environmental Complaints are presented in Annex F.
([1]) As some of the minor items are yet to be closed out in March 2019, the construction phase EM&A programme and Operation Phase EM&A programme were undertaking in parallel in March 2019.
([2]) A standby facility; only operates when the CHPs are not in operation or when the biogas generated exceeded the utilisation rate of the CHPs.