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Contents

EXECUTIVE SUMMARY  1

Environmental Monitoring and Audit Progress  1

Air Quality Monitoring  1

Environmental Exceedance/ Non-conformance/ Compliant/ Summons and Prosecution  1

1.    PROJECT INFORMATION  1

1.1   Background  1

1.2   General Site Description  2

1.2.1    MAJOR ACTIVITIES UNDERTAKEN  2

2.    Environmental Monitoring and Audit Requirements AND RESULTS  2

2.1   Environmental Monitoring  2

2.1.1    AIR QUALITY  2

2.1.2    ODOUR  5

2.2   SITE AUDIT  5

2.3   Landscape and Visual 5

2.4   WASTE MANAGEMENT  5

ANNEX A      Project Layout

ANNEX B      Project Organisation Chart and Contact Detail

 

 

List of Tables

Table 1.1     Summary of Activities Undertaken in the Reporting Period  2

Table 2.1     Hourly Average of Parameters Recorded for CAPCS  2

Table 2.2     Hourly Average of Parameters Recorded for CHP 1  3

Table 2.3     Hourly Average of Parameters Recorded for CHP 2  3

Table 2.4     Hourly Average of Parameters Recorded for CHP 3  3

Table 2.5     Hourly Average of Parameters Recorded for ASP  4

Table 2.6     Hourly Average of Parameters Recorded for the Standby Flaring Gas Unit  4

Table 2.7     Quantities of Waste Generated from the Operation of the Project  5

 

 

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 38th Quarterly Environmental Monitoring and Audit (EM&A) report presenting the EM&A works carried out during the period from 1 September 2024 to 30 November 2024 in accordance with the EM&A Manual.

Environmental Monitoring and Audit Progress

Air Quality Monitoring

Non-compliance of emission limits of VOCs and Total Odour from CAPCS; NOx and HCl from CHP1; NOx from CHP2; and NOx, SO2, NH3, and HCl from the ASP were recorded during September 2024.

Non-compliance of emission limits of Total Odour from CAPCS; NOx and HCl from CHP1; NOx from CHP2; NOx from CHP3; NOx, SO2, NH3, and HCl from the ASP; and HF from the Standby Gas Flaring Unit were recorded during October 2024.

Non-compliance of emission limits of VOCs and Total Odour from CAPCS; NOx and SO2 from CHP1; NOx and SO2 from CHP2; NOx, SO2, and HCl from CHP3; NOx, SO2, NH3, and HCl from the ASP; and Dust, CO, NOx, SO2, VOCs, HCl, and HF from the Standby Gas Flaring Unit were recorded during November 2024.

Exceedances occurred due to sensor issues, system instability and start-up issues.

Environmental Exceedance/ Non-conformance/ Compliant/ Summons and Prosecution

Exceedances for the air emission limits for the CAPCS, CHP, ASP stacks, and Standby Gas Flaring Unit were recorded during the reporting period.

One (1) Environmental Complaint regarding odour nuisance was received at the facility on 9 October 2024.  Mitigation measures were implemented, daily odour patrols were arranged, ad-hoc independent odour Patrols were conducted on 16 and 30 October 2024 and interim report regarding the complaint was submitted to EPD on 28 November 2024.  

Two (2) Environmental Non-Conformances regarding broken doors at waste storage area and chemical spillage were observed on 19 August 2024.  Mitigation measures were implemented and investigation reports regarding the non-conformances were submitted to EPD on 23 and 25 September 2024 respectively.

 

1.         PROJECT INFORMATION

1.1       Background

The Organic Resources Recovery Centre (ORRC) Phase I development (hereinafter referred to as “the Project”) is to design, construct and operate a biological treatment facility with a capacity of about 200 tonnes per day and convert source-separated organic waste from commercial and industrial sectors (mostly food waste) into compost and biogas.

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.

1.2       General Site Description

The Project Site is located at Siu Ho Wan in North Lantau with an area of about 2 hectares. The facility received an average of 158.34 to 197.12 tonnes and treated an average of 113.63 to 152.01 tonnes of source separated organic waste per day during the reporting period.

1.2.1   MAJOR ACTIVITIES UNDERTAKEN

A summary of the major activities undertaken in the reporting period is shown in Table 1.1.

Table 1.1  Summary of Activities Undertaken in the Reporting Period

Activities Undertaken in the Reporting Period    

·          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;

·          Completion of repair works for inner roller shutters (Receiving Bay);

·          Ongoing repair works for outer roller shutter for Receiving Bay 2 & 3;

·          ASP cleaning

·          Completion of repair works for external doors of the Receiving Bay;

·          Pretreatment line 1 maintenance;

·          CHP3 cleaning

·          Cleaning of desulphurisation column 2;

·          Replacement of exhaust heat exchanger of CHP 2; and

·          Replacement of exhaust heat exchanger of CHP 3.

 

2.         Environmental Monitoring and Audit Requirements AND RESULTS

2.1       Environmental Monitoring

2.1.1   AIR QUALITY

The concentrations of concerned air pollutants emitted from the stacks of the CAPCS, CHP, ASP and Standby Flaring Gas Unit during the reporting period are monitored on-line by the continuous environmental monitoring system (CEMS).  The number of exceedances of the concerned air emissions monitored for the CAPCS, CHP, ASP and Standby Flaring Gas Unit during this reporting period are presented in Tables 2.1 to 2.6. 

It should be noted that measurements recorded under abnormal operating conditions, e.g., start up and stopping of stacks and unstable operation, as well as test runs and interference of sensor, are disregarded.

Table 2.1  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 – 1,714

 

680

Identified (c)

Sensor issues

Dust (or TSP)

0 – 1

6

Nil

Nil

Odour (including NH3 & H2S) (b)

0 – 2,129.72

220

Identified (d)

Sensor issues

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 VOCs exceedances (number of exceedances on that day) were identified on 14(5), 15(21), and 16(15) September 2024; and 7(2), 8(8), 12(1), 20(5), and 22(20) November 2024.

(d)    Dates with Odour exceedances (number of exceedances on that day) were identified on 2(5), 3(3), 8(2), 9(4), 10(3), 16(9), 17(24), 18(24), 19(24), 20(23), 21(5), 25(11), 26(22), 27(24), 28(24), 29(24), and 30(18) September 2024; 1(19), 2(14), 3(17), 4(12), 5(14), 6(17), 7(16), 8(17), 9(16), 10(5), 11(1), 12(9), 13(3), 14(4), 15(10), 16(1), 17(7), 18(6), 19(13), 20(13), 21(12), 22(9), 23(2), 24(6), 25(7), 27(11), 28(10), 29(9), 30(9), and 31(15) October 2024; and 1(11), 2(15), 3(16), 4(6), 5(11), 6(12), 7(5), 8(6), 9(11), 10(9), 11(10), 12(16), 13(4), 21(2), 22(11), 23(24), 24(24), 25(24), 26(24), 27(24), 28(24), 29(24), and 30(24) November 2024 .

Table 2.2  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 - 13

15

Nil

Nil

Carbon Monoxide

0 - 449

650

Nil

Nil

NOx

0 – 519

300

Identified (c)

System unstable (e.g., low efficiency)

SO2

0 – 71

50

Identified (d)

System unstable (e.g., low efficiency)

VOCs (including methane) (b)

0 – 726

1,500

Nil

Nil

HCl

0 - 31

10

Identified (e)

System unstable (e.g., low efficiency)

HF

0 - 1

1

Nil

Nil

Notes:

(a)    All values refer to an oxygen content in the exhaust gas of 6% and dry basis.

(b)    The VOCs emission limit includes methane as biogas is adopted as fuel in the combustion process.

(c)    Dates with NOx exceedances (number of exceedances on that day) were identified on 1(13), 3(6), 4(15), 5(13), 6(20), 9(9), 10(10), 11(24), 12(24), 13(24), 14(21), 15(18), 16(24), 17(24), 18(24), 19(24), 20(24), 21(24), 22(24), 23(24), 24(24), 25(24), 26(24), 27(24), 28(24), 29(24), and 30(23) September 2024; 1(24), 2(24), 3(24), 4(21), 6(14), 7(24), 8(24), 9(24), 10(24), 11(24), 12(24), 13(24), 14(24), 15(24), 16(21), 17(15), 18(3), 19(1), 22(3), 24(9), 25(10), 26(24), 27(19), 28(4), 29(5), 30(1), and 31(10) October 2024; and 1(4), 2(7), 3(24), 4(1), 10(5), 11(9), 12(24), 13(24), 14(23), 15(8), 16(24), 17(24), 18(24), 19(24), 20(16), 21(17), 23(3), 24(1), 25(24), 26(4), 27(9), 28(21), 29(24), and 30(23) November 2024.

(d)    Dates with SO2 exceedances (number of exceedances on that day) were identified on 10(2), 13(15), 14(23), 15(7), 16(24), 17(11), 18(8), 27(5), and 28(3) November 2024.

(e)    Dates with HCl exceedance (number of exceedances on that day) were identified on 19(1) September 2024 and 18(2) October 2024.

 

Table 2.3  Hourly Average of Parameters Recorded for CHP 2

Parameter

Range of Hourly Average Conc. (mg/Nm3) (a)

Max. Emission Limit (mg/Nm3)

Exceedance

Identified

Remarks

Dust (or TSP)

0 – 8

15

Nil

Nil

Carbon Monoxide

0 – 142

650

Nil

Nil

NOx

0 – 511

300

Identified (c)

System unstable (e.g., low efficiency)

SO2

0 – 71

50

Identified (d)

System unstable (e.g., low efficiency)

VOCs (including methane) (b)

0 – 493

1,500

Nil

Nil

HCl

0 – 2

10

Nil

Nil

HF

0 – 1

1

Nil

Nil

Notes:

(a)    All values refer to an oxygen content in the exhaust gas of 6% and dry basis.

(b)    The VOCs emission limit includes methane as biogas is adopted as fuel in the combustion process.

(c)    Dates with NOx exceedances (number of exceedances on the day) were identified on 4(7), 5(4), 6(8), 10(3), 11(13), 12(9), 13(2), 16(10), 19(1), 21(13), 22(3), 23(3), 24(6), and 25(7) September 2024; 1(9), 2(7), 4(3), 5(2), 6(1), 8(10), 9(18), 10(6), 11(5), 12(19), 13(22), 14(22), 15(10), 16(8), 17(16), 18(9), 19(7), 22(3), 23(12), 24(19), 25(10), 26(17), 27(23), 28(24), 29(16), 30(19), and 31(8) October 2024; and 1(18), 2(21), 3(6), 4(8), 5(5), 6(2), 7(12), 8(24), 9(15), 10(15), 11(18), 12(24), 13(24), 14(10), 15(19), 16(8) 17(18), 18(17), 19(15), 20(1), 21(1), 22(8), 23(12), and 24(22) November 2024.

(d)    Dates with SO2 exceedances (number of exceedances on that day) were identified on 8(4), 10(7), 11(5), 14(3), 15(19), and 18(3) November 2024.

Table 2.4  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 – 14

15

Nil

Nil

Carbon Monoxide

0 – 499

650

Nil

Nil

NOx

0 – 573

300

Identified (c)

System unstable (e.g., low efficiency)

SO2

0 – 68

50

Identified (d)

System unstable (e.g., low efficiency)

VOCs (including methane) (b)

0 – 675

1,500

Nil

Nil

HCl

0 – 20

10

Identified (e)

System unstable (e.g., low efficiency)

HF

0 – 1

1

Nil

Nil

Notes:

(a)    All values refer to an oxygen content in the exhaust gas of 6% and dry basis.

(b)    The VOCs emission limit includes methane as biogas is adopted as fuel in the combustion process.

(c)    Dates with NOx exceedances (number of exceedances on the day) were identified on 5(1), 6(1), 18(1), 21(2), 22(3), 23(15), 24(6), 25(1), 26(6), 27(20), 28(12), 29(12), and 30(4) October 2024; and 1(3), 2(5), 3(7), 5(1), 8(7), 9(9), 10(21), 11(14), and 30(2) November 2024.

(d)    Dates with SO2 exceedances (number of exceedances on that day) were identified on 7(4), 10(6), and 11(5) November 2024.

(e)    Date with HCl exceedance (number of exceedance on that day) was identified on 4(1) November 2024.

Table 2.5  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

5

Nil

Nil

Carbon Monoxide

0 – 97

100

Nil

Nil

NOx

0 – 1,455

200

Identified (c)

System unstable (e.g., low efficiency)

SO2

0 – 398

50

Identified (d)

System unstable (e.g., low efficiency)

VOCs (including methane) (b)

0 – 19

20

Nil

Nil

NH3

0 – 285

35

Identified (e)

System unstable (e.g., low efficiency)

HCl

0 – 72

10

Identified (f)

System unstable (e.g., low efficiency)

HF

0 – 1

1

Nil

Nil

Notes:

(a)    All values refer to an oxygen content in the exhaust gas of 11% and dry basis.

(b)    The VOCs emission limit include methane as biogas is adopted as fuel in the combustion process.

(c)    Dates with NOx exceedances (number of exceedances on the day) were identified on 1(13), 2(11), 3(4), 4(6), 5(1), 9(6), 10(10), 11(12), 12(8), 13(16), 14(9), 15(15), 16(10), 17(3), 18(12), 19(24), 20(18), 21(4), 22(22), 23(13), 24(24), 25(14), 26(22), 27(22), 28(14), 29(22), and 30(17) September 2024; 1(12), 2(12), 3(19), 4(15), 5(20), 6(23), 7(11), 8(19), 9(23), 10(24), 11(23), 12(22), 13(12), 14(20), 15(22), 16(22), 17(18), 18(17), 19(16), 20(23), 21(18), 22(9), 23(20), 24(23), 25(22), 26(20), 27(24), 28(18), 29(9), 30(21), and 31(21) October 2024; and 1(8), 2(22), 3(18), 4(20), 5(18), 6(24), 7(24), 8(21), 9(23), 10(24), 11(19), 12(17), 13(7), 14(16), 15(20), 16(7), 17(8), 18(12), 19(5), 20(9), 21(11), 22(24), 23(24), 24(24), 25(21), 26(24), 27(24), 28(21), 29(23), and 30(22) November 2024.

(d)    Dates with SO2 exceedances (number of exceedances on the day) were identified on 4(2), 10(2), 11(13), 12(16), 13(23), 14(23), 15(14), 16(16), 17(8), 18(18), 19(24), 20(13), 21(7), 22(17), 23(22), 25(3), 26(3), and 30(1) September 2024;  1(1) and 23(1) October 2024; and 2(8), 3(12), 4(3), 6(12), 7(23), 8(21), 9(22), 10(23), 11(18), 12(20), 13(7), 14(21), 15(22), 16(7), 17(11), 18(13), 19(5), 20(8), 21(11), 22(24), 23(24), 24(24), 25(21), 26(24), 27(24), 28(21), 29(24), and 30(22) November 2024.

(e)    Dates with NH3 exceedances (number of exceedances on the day) were identified on 3(3), 5(1), 11(10), 12(6), 13(4), 15(3), 16(2), 17(4), 18(4), 19(2), 22(2), 23(2), 24(3), 25(2), 26(5), 27(2), 28(2), 29(2), and 30(4) September 2024; 1(7), 2(6), 3(6), 4(1), 5(1), 9(1), 10(3), 13(4), 14(2), 18(3), 20(1), 21(1), 22(2), 23(1), 25(2), 26(2), 27(2), 29(1), 30(4), and 31(1) October 2024; and 1(6), 2(17), 3(18), 4(12), 5(4), 7(3), 8(6), 9(2), 10(6), 11(6), 12(7), 14(9), 15(13), 16(6), 17(9), 18(9), 19(5), 20(8), 21(5), 23(1), 25(1), 28(1), 29(12), and 30(12) November 2024.

(f)    Dates with HCl exceedances (number of exceedances on the day) were identified on 26(2) September 2024; 1(1) October 2024; and 2(2), 3(3), and 4(2) November 2024.

Table 2.6  Hourly Average of Parameters Recorded for the Standby Flaring Gas Unit

Parameter

Range of Hourly Average Conc. (mg/Nm3) (a)

Max. Emission Limit (mg/Nm3)

Exceedances

Identified

Remarks

Dust (or TSP)

0 – 32

5

Identified (c)

Start-up issues, flare not at working temperature

Carbon Monoxide

0 – 1,145

100

Identified (d)

Start-up issues, flare not at working temperature

NOx

0 – 274

200

Identified (e)

Start-up issues, flare not at working temperature

SO2

0 – 1,938

50

Identified (f)

Start-up issues, flare not at working temperature

VOCs (including methane) (b)

0 – 1,064

20

Identified (g)

Start-up issues, flare not at working temperature

HCl

0 – 103

10

Identified (h)

Start-up issues, flare not at working temperature

HF

0 – 4

1

Identified (i)

Start-up issues, flare not at working temperature

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)    Date with Dust exceedances (number of exceedances on that day) was identified on 15(7) November 2024.

(d)    Date with CO exceedances (number of exceedances on that day) was identified on 15(7) November 2024.

(e)    Date with NOx exceedances (number of exceedances on that day) was identified on 15(4) November 2024.

(f)    Date with SO2 exceedances (number of exceedances on that day) was identified on 15(14) November 2024.

(g)    Dates with VOCs exceedances (number of exceedances on that day) were identified on 15(8) and 28(1) November 2024.

(h)    Date with HCl exceedances (number of exceedances on that day) was identified on 15(7) November 2024.

(i)     Dates with HF exceedances (number of exceedances on that day) were identified on 13(2) and 23(3) October 2024; and 11(5), 12(1), 15(1), and 28(1) November 2024.

2.1.2   ODOUR

Odour patrol was conducted by the independent odour patrol team of ALS Technichem (HK) Pty Ltd on 9 September 2024.

One (1) Environmental Complaint regarding odour nuisance was received at the facility on 9 October 2024.  Mitigation measures were implemented, daily odour patrols were arranged, ad-hoc independent odour Patrols were conducted on 16 and 30 October 2024 and interim report regarding the complaint was submitted to EPD on 28 November 2024.

2.2       SITE AUDIT

Environmental mitigation measures (related to air quality, water quality, waste, land contamination, hazard-to-life, and landscape and visual) to be implemented during the operation phase of the Project are recommended in the approved EIA Report and EM&A Manual.  Monthly site audits for September 2024 to November 2024 have been carried out to check the implementation of these mitigation measures.  Follow-up actions resulting from the site audits were generally taken as reported by the Contractor.  The Contractor has implemented environmental mitigation measures recommended in the approved EIA Report and EM&A Manual.

2.3       Landscape and Visual

The monthly inspections of the landscape and visual mitigation measures for the operation phase of the Project were performed on 12 September 2024, 28 October 2024 and 27 November 2024, and no non-compliance in relation to the landscape and visual mitigation measures were identified.

2.4       WASTE MANAGEMENT

Wastes generated from the operation of the Project include chemical waste, wastes generated from pre-treatment process and general refuse.  The quantities of different types of waste generated from the operation of the Project in the reporting period are summarised in Table 2.7.

Table 2.7     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) (e)

Recycled (c)

September 2024

0 L (d)

1,106.69 tonnes

0 tonnes

2.765 tonnes (e)

0.049 tonnes

October 2024

0 L (d)

1,398.65 tonnes

0 tonnes

2.880 tonnes (e)

0.067 tonnes

November 2024

0 L (d)

1,341.30 tonnes

0 tonnes

2.995 tonnes (e)

0.052 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, no metals, papers/ cardboard packing or plastics were sent to recyclers for recycling during the reporting period.

(c)   Among general refuse, 0.014 tonnes of metals, 0.123 tonnes of papers/ cardboard packing and 0.031 tonnes of plastics were sent to recyclers for recycling during the reporting period.

(d)   No chemical waste was disposed of at CWTC in September 2024, October 2024 and November 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.