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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  1

1.2.1    MAJOR ACTIVITIES UNDERTAKEN  1

2.    Environmental Monitoring and Audit Requirements AND RESULTS  2

2.1   Environmental Monitoring  2

2.1.1    AIR QUALITY  2

2.1.2    ODOUR  4

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  1

Table 2.1     Hourly Average of Parameters Recorded for CAPCS  2

Table 2.2     Hourly Average of Parameters Recorded for CHP 1  2

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  3

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 37th Quarterly Environmental Monitoring and Audit (EM&A) report presenting the EM&A works carried out during the period from 1 June 2024 to 31 August 2024 in accordance with the EM&A Manual.

Environmental Monitoring and Audit Progress

Air Quality Monitoring

Non-compliance of emission limits of NOx and SO2, from CHP1; NOx from CHP2; NOx from CHP3; and NOx, SO2, and NH3, from the ASP were recorded during June 2024.

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

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

Exceedances occurred due to sensor issues, system instability, emergency condition and unstable operation.

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 was received during the reporting period.  

 

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 165.26 to 181.95 tonnes and treated an average of 127.83 to 137.07 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;

·         CHP fine-tuning ongoing (will continue into next month); 

·         PT Line 1 overhaul ongoing (will continue into next month);

·         ASP overhaul;

·         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;

·         CHP fine-tuning (began in June 2024, will continue into next month);

·         Overhaul of PT Line 1 completed

·         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;

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

·         ASP column 1 Cleaning

 

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, and ASP 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 and ASP 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 – 579

 

680

Nil

Nil

Dust (or TSP)

0 – 0

6

Nil

Nil

Odour (including NH3 & H2S) (b)

0 – 964.56

220

Identified (c)

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 Odour exceedances (number of exceedances on that day) were identified on 26(13), 27(6), 28(12), 29(21), 30(9), and 31(6) August 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 - 7

15

Nil

Nil

Carbon Monoxide

0 - 136

650

Nil

Nil

NOx

0 – 666

300

Identified (c)

System unstable (e.g., low efficiency)

SO2

0 – 74

50

Identified (d)

System unstable (e.g., low efficiency)

VOCs (including methane) (b)

0 – 882

1,500

Nil

Nil

HCl

0 - 12

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(24), 2(24), 3(13), 4(14), 5(20), 6(14), 7(18), 8(24), 9(24), 10(24), 11(24), 12(24), 13(24), 14(12), 15(12), 16(24), 17(2), 18(8), 19(21), 20(24), 21(24), 22(24), 23(24), 24(15), 25(24), 26(24), 27(23), 28(23), 29(24), and 30(23) June 2024; 1(24), 2(24), 3(24), 4(24), 5(23), 6(24), 7(24), 8(9), 9(8), 10(24), 11(24), 12(18), 13(24), 14(24), 15(21), 16(18), 17(13), 18(24), 19(21), 20(18), 21(14), 22(9), 23(21), 24(18), 25(21), 26(14), 27(24), 28(24), 29(24), 30(24), and 31(23) July 2024; and 1(21), 2(23), 3(24), 4(24), 5(23), 6(24), 7(24), 8(24), 9(24), 10(24), 11(18), 12(24), 13(24), 14(24), 15(24), 16(24), 17(24), 18(24), 19(24), 20(24), 21(21), 22(24), 23(24), 24(24), 25(24), 26(24), 27(24), 28(24), 29(24), 30(24), and 31(23) August 2024.

(d)    Dates with SO2 exceedances (number of exceedances on that day) was identified on 28(11) June 2024 and 8(6), 9(21), 10(24), 11(10), 12(13), 13(14), 14(20), 16(11), 17(8), 18(13), 19(15), 28(6), 29(10), and 30(4) August 2024.

(e)    Date with HCl exceedance (number of exceedances on that day) was identified on 23(1) July 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 – 490

650

Nil

Nil

NOx

0 – 461

300

Identified (c)

System unstable (e.g., low efficiency)

SO2

0 – 48

50

Nil

Nil

VOCs (including methane) (b)

0 – 569

1,500

Nil

Nil

HCl

0 – 10

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 1(9), 2(3), 3(10), 4(11), 5(10), 6(10), 7(9), 8(15), 9(8), 10(5), 11(4), 12(3), 13(11), 14(1), 15(4), 16(2), 17(1), 18(8), 19(1), 20(5), 21(3), 22(6), 23(7), 24(9), 25(12), 26(6), and 27(12) June 2024; 9(7), 10(24), 11(9), 12(7), 13(24), 14(24), 15(24), 16(18), 17(2), 18(1), 19(1), 20(2), 22(1), 23(3), 24(1), 28(1), 29(1), and 31(1) July 2024; and 1(8), 2(21), 3(18), 4(23), 5(15), 6(9), 8(17), 9(24), 10(18), 11(2), 12(7), 13(6), 14(10), 15(1), 20(2), 21(5), 22(13), 23(12), 24(2), 25(1), 27(2), and 28(4) August 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 – 13

15

Nil

Nil

Carbon Monoxide

0 – 245

650

Nil

Nil

NOx

0 – 556

300

Identified (c)

System unstable (e.g., low efficiency)

SO2

0 – 50

50

Nil

Nil

VOCs (including methane) (b)

0 – 604

1,500

Nil

Nil

HCl

0 – 1

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 20(1), 21(4), 22(14), 24(3), 25(2), 27(4), 28(14), 29(16), and 30(24) June 2024; and 1(24), 2(24), 3(24), 4(24), 5(24), 6(22), 7(18), 8(7), 9(24), 10(24), 11(23), 12(23), 13(24), 14(24), 15(24), 16(24), and 17(9) July 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 – 96

100

Nil

Nil

NOx

0 – 970

200

Identified (c)

System unstable (e.g., low efficiency, unstable column temperature)

SO2

0 – 210

50

Identified (d)

System unstable (e.g., low efficiency, unstable column temperature)

VOCs (including methane) (b)

0 – 20

20

Nil

Nil

NH3

0 – 318

35

Identified (e)

System unstable (e.g., low efficiency, unstable column temperature)

HCl

0 – 26

10

Identified (f)

System unstable (e.g., low efficiency, unstable column temperature)

HF

0 – 1

1

Nil

Nil

Notes:

(a)    All values refer to an oxygen content in the exhaust gas of 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(5), 2(7), 3(8), 4(4), 5(5), 6(18), 7(12), 8(13), 9(22), 10(8), 11(22), 12(12), 13(3), 14(9), 15(15), 16(14), 17(7), 19(5), 21(3), 22(2), 23(1), 24(3), 25(1), 26(11), 27(3), 28(12), 29(7), and 30(6) June 2024; 1(20), 2(17), 3(11), 4(11), 5(11), 6(15), 7(16), 8(18), 9(24), 10(18), 11(21), 12(22), 13(17), 14(24), 15(22), 16(18), 17(6), 18(6), 19(20), 20(17), 21(9), 22(10), 24(13), 25(12), 26(12), 27(14), 28(4), 29(5), 30(7), and 31(7) July 2024; and 1(23), 2(19), 3(5), 4(4), 6(8), 7(21), 8(17), 9(3), 10(12), 11(1), 12(8), 13(13), 14(10), 15(5), 16(9), 17(10), 18(7), 19(11), 20(11), 21(5), 22(8), 23(14), 24(13), 25(1), 26(2), 27(15), 28(15), 29(11), 30(23), and 31(23) August 2024.

(d)    Dates with SO2 exceedances (number of exceedances on the day) were identified on 1(1), 3(2), 4(1), 5(1), 7(1), 8(3), 15(9), 23(1), 28(14), 29(13), and 30(16) June 2024; 1(3), 14(1), 15(9), 17(2), 19(2), 28(7), 29(1), 30(3), and 31(12) July 2024; and 6(9), 7(24), 8(18), 9(3), 10(24), 11(24), 12(21), 13(19), 14(24), 15(12), 16(18), 17(23), 18(24), 19(20), 20(21), 21(15), 22(23), 23(8), 28(14), 29(24), and 30(21) August 2024.

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

(f)    Dates with HCl exceedances (number of exceedances on the day) were identified on 6(2), 7(1), 8(1), 11(1), and 13(1) August 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 – 8

5

Identified (c)

Emergency condition required the use of flare

Carbon Monoxide

0 – 821

100

Identified (d)

Emergency condition required the use of flare

NOx

0 – 73

200

Nil

Nil

SO2

0 – 5

50

Nil

Nil

VOCs (including methane) (b)

0 – 1,300

20

Identified (e)

Emergency condition required the use of flare, unstable operation (low temperature)

HCl

0 – 4

10

Nil

Nil

HF

0 – 5

1

Identified (f)

Emergency condition required the use of flare, unstable operation (low 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 exceedance (number of exceedance on that day) was identified on 11(1) July 2024.

(d)    Date with CO exceedance (number of exceedance on that day) was identified on 5(1) July 2024.

(e)    Dates with VOCs exceedances (number of exceedances on that day) was identified on 5(1) July 2024 and 23(1) August 2024.

(f)    Dates with HF exceedances (number of exceedances on that day) were identified on 5(2), 6(4), 7(3), 8(5), 11(1), 22(1), 23(1), and 26(2) July 2024 and 23(1) August 2024.

2.1.2   ODOUR

Odour patrol was conducted by the independent odour patrol team of ALS Technichem (HK) Pty Ltd on 5 July 2024, 8 July 2024, 9 July 2024; and 9 August 2024, 15 August 2024 respectively.

No complaint was received during the reporting period. 

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 June 2024 to August 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 28 June 2024, 25 July 2024 and 19 August 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)

June 2024

1,200 L (d)

1,199.51 tonnes

0 tonnes

4.080 tonnes (e)

0.052 tonnes

July 2024

18.496 L (d)

1,391.16 tonnes

0 tonnes

2.995 tonnes (e)

0.085 tonnes

August 2024

1,200 L (d)

1,160.32 tonnes

0 tonnes

3.110 tonnes (e)

0.038 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, 0.003 tonnes of metals, 0.125 tonnes of papers/ cardboard packing and 0.047 tonnes of plastics were sent to recyclers for recycling during the reporting period.

(d)   1,200L of chemical waste (spent lube oil) was disposed of at CWTC in June 2024; 16,000L of chemical waste (unwanted flocculant agent) was disposed of at CWTC in July 2024. 4,560kg of chemical waste (waste lead-acid battery) was also disposed of at CWTC in July 2024; for unit consistency this figure has been converted to 2,496L, assuming a density of 1.827 kg/L; and 1,200L of chemical waste (spent lube oil) was disposed of at CWTC in August 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.