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Development of Organic Waste Treatment Facilities, Phase 2
發展第二期有機資源回收中心
Environmental Impact Assessment – Executive Summary
環境影響評估報告-行政摘要
August 2013
二零一三年八月
Environmental Protection Department
環境保護署
Mott MacDonald, 20/F AIA Kowloon Tower, Landmark East, 100 How Ming Street, Kwun Tong, Kowloon, Hong Kong
t +852 2828 5757 f +852 2827 1823, W www.mottmac.com
3/F., West Wing, 88 Victoria Road, Kennedy Town, Hong Kong 香港堅尼地城域多利道 88號 3樓西翼
Development of Organic Waste Treatment Facilities, Phase 2
發展第二期有機資源回收中心
Environmental Impact Assessment – Executive Summary
環境影響評估報告-行政摘要
August 2013 二零一三年八月
Environmental Protection Department 環境保護署
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Development of Organic Waste Treatment Facilities, Phase 2
EIA Executive Summary
Chapter Title Page
1. Introduction 1
2. Project Description 2
2.1 Need for the Project _________________________________________________________________ 2 2.2 Project Location and Scale ____________________________________________________________ 2 2.3 Layout and Facilities _________________________________________________________________ 2 2.4 Consideration of Alternatives __________________________________________________________ 3 2.5 Implementation Programme ___________________________________________________________ 6
3. Summary of the Environmental Impact Assessment 7
3.1 Air Quality Impact ___________________________________________________________________ 7 3.2 Hazard to Life ______________________________________________________________________ 9 3.3 Noise Impact ______________________________________________________________________ 10 3.4 Water Quality Impact _______________________________________________________________ 10 3.5 Waste Management Implications ______________________________________________________ 11 3.6 Ecological Impact __________________________________________________________________ 12 3.7 Fisheries Impact ___________________________________________________________________ 12 3.8 Landscape and Visual Impact _________________________________________________________ 12 3.9 Cultural Heritage Impact _____________________________________________________________ 13
4. Environmental Monitoring and Audit 14
5. Conclusion 15
Tables
Table 2.1: Main Project Facilities and Systems _____________________________________________________ 3 Table 2.2: Summary of Assessment Results for Site Selection _________________________________________ 4 Table 2.3: Indicative Milestones for Key Project Stages ______________________________________________ 6 Table 3.1: Construction dust modelling results summary ______________________________________________ 7 Table 3.2: Summary of operation modelling results against the current AQOs _____________________________ 8 Table 3.3: Summary of operation modelling results against the new AQOs _______________________________ 8
Figures
Figure 1 Location of the Project
Figure 2 Preliminary Site Layout
Content
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
The Government has carried out a number of waste management studies and projects focused on organic
waste in recent years, including:
“Organic Waste Generation and Management Study – Major Generators of Food Waste and Yard
Waste”;
“Pilot Plant Development of Biodegradable Waste Treatment Facilities – Investigation”; and
“Pilot Composting Facility at the Kowloon Bay Waste Recycling Centre”.
In 2008, building on these studies, the Environmental Protection Department (EPD) initiated a Feasibility
Study and Environmental Impact Assessment (EIA) for an Organic Waste Treatment Facility (OWTF) at Siu
Ho Wan, Lantau1. The plant was designed to receive and treat 200 tonnes per day of source separated
organic waste (mostly food waste).
Following the Government’s review of the Policy Framework action agenda in 2011, a decision was taken
to further address Hong Kong’s waste issues through a comprehensive waste management strategy. This
included the implementation of a Project to investigate the feasibility for providing an additional OWTF at
Sha Ling, North District to receive and process 300 tonnes per day of source separated food waste
generated from the commercial and industrial (C&I) sectors.
The May 2013 Environment Bureau Planning Strategy Report, ‘Hong Kong: Blueprint for Sustainable Use
of Resources 2013-2022’ notes that further development of landfill sites is highly constrained by issues of
land availability, the high opportunity costs of developing land, and planning constraints/local opposition.
The Report states that waste related technologies that generate energy will be adopted and identifies
OWTF as one of the options for implementation.
The Organic Waste Treatment Facilities, Phase 2 (hereafter as the ‘Project’) is proposed to be constructed
and operated in Sha Ling, North District (see Figure 1). The purpose of this Project is to identify and adopt
proven biological treatment technologies to recover reusable materials and energy, such as compost, heat,
electricity and biogas from source-separated organic waste.
The Project is a Designated Project under the Environmental Impact Assessment Ordinance (EIAO):
- Item G.4 of Part I, Schedule 2 of the EIAO: “A waste disposal facility (excluding any refuse collection
point), or waste disposal activities, for (a) refuse; or (b) chemical, industrial or special wastes”.
An Environmental Impact Assessment (EIA) study was conducted in accordance with EIA Study Brief (No.
ESB-226/2011) to provide information on the nature and extent of environmental impacts arising from the
construction and operation of the proposed Project and related activities taking place concurrently.
This Executive Summary presents the key findings of the Environmental Impact Assessment (EIA) for the
Project as required under the EIAO.
_________________________
1 Identified as the Organic Waste Treatment Facility - Phase 1
1. Introduction
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
2.1 Need for the Project
The Hong Kong Government recognises a pressing need to pursue more sustainable alternatives to
present waste treatment and disposal practices in Hong Kong. Continuation of the current disposal system
in Hong Kong is not considered to be a sustainable option as a result of diminishing landfill capacity, and in
light of social, economic and environmental issues. According to the Environment Bureau’s recently
published Planning Strategy Report, ‘Hong Kong: Blueprint for Sustainable Use of Resources 2013-2022’,
Hong Kong’s three major landfill facilities are expected to reach capacity by 2015 (South East New
Territories Landfill (SENT)), 2017 (North East New Territories Landfill (NENT)) and 2019 (West New
Territories Landfill (WENT)). Further expansion of existing facilities or the development of new landfill sites
is highly constrained by issues of land availability, the high opportunity costs of developing land, and
planning constraints/local opposition.
In December 2005, EPD published ‘A Policy Framework for the Management of Municipal Solid Waste in
Hong Kong (2005-2014)’ (Policy Framework), setting out policy tools and initiatives to be implemented for
the sustainable management of municipal solid waste (MSW) in Hong Kong. The Policy Framework
targeted an increase in recovery rates to 50%, and reduction in the total amount of MSW disposed of in
landfills to less than 25% by 2014. Achieving these targets requires reduced reliance on landfill through the
application of new waste treatment technologies. An Advisory Group on Waste Management Facilities was
subsequently set up to investigate the most appropriate treatment and disposal solutions. The Group
recommended the development of OWTFs as part of an integrated strategy for recovering organic wastes
from the C&I Sector. Investment in the OWTFs is also a Key Action highlighted in the Government’s Hong
Kong Blueprint for Sustainable Use of Resources 2013-2022 published in May 2013.
The OWTFs are to be developed in two phases, with Phase 1 located at Siu Ho Wan in Northern Lantau
Island, and Phase 2 (this Project) at Sha Ling, Northern New Territories, on the site of the former Sha Ling
Livestock Waste Composting Plant (SLCP). The two phases of OWTF facilities are planned to use
anaerobic digestion with composting to treat a combined 500 tonnes of organic waste daily, 300 tonnes of
which will be treated at this Project. The OWTF projects will reduce the volume of material requiring
disposal, and together could reduce the quantity of C&I waste requiring landfill by more than 15%, at
present rates.
This Project is important, not only to mitigate the depletion of available landfill space, but also in order to
conserve resources through the recovery of compost and biogas that would be otherwise unused.
Compost (or other soil improvement products) can be used as a sustainable input for landscaping, farming
and horticulture, while biogas is a source of renewable energy. The Project will therefore represent a
valuable contributor to Hong Kong Government’s climate change and energy security objectives.
2.2 Project Location and Scale
The Project is located at Sha Ling in the North District, within the Frontier Closed Area (see Figure 1). The
Site has an area of around 2.5 hectares, of which roughly 1.5 hectares has been previously developed. The
former SLCP currently occupies the site; although this facility was decommissioned in 2010.
2.3 Layout and Facilities
The preliminary design includes the following main elements listed in Table 2.1 and shown in Figure 2:
2. Project Description
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
Table 2.1: Main Project Facilities and Systems
Aspect System / facility
Main structure Waste reception and preparation areas
Administration area
Environmental Education Centre
Pre-treatment system
Composting Composting tunnels
Maturation, treatment / storage area
Anaerobic Digestion Buffer Tank
Digesters
Separator/ Dewatering Unit
Hygieneisation Unit
Biogas Use Gas Cleaning
Gas Holders
Compressors
Flare stack
Combined Heat and Power Unit
Boiler
Heat exchangers
Water and waste water
systems
Water supply system
Wastewater Treatment Plant
Effluent retention tank
Drainage system
Emissions/Odour Treatment
CHP Exhaust treatment system
Odour treatment system
Chimney
Ancillary Facilities Weighbridge
Vehicle Washing Facilities
Maintenance Workshop and Utility Area
Continuous Emission Monitoring System
Power Supply System
Instrumentation, Control and Monitoring System
Security / registration
The preliminary design is based on the best available information. The assessment adopts a conservative
approach wherever possible in terms of the design options presented.
2.4 Consideration of Alternatives
2.4.1 Site Selection
In 2006, EPD conducted a site selection study in conjunction with PlanD to identify appropriate facilities for
treating organic wastes. A long list of 33 alternative sites was produced by compiling the feasible sites
proposed by EPD after preliminary screening, and feasible sites as recommended by PlanD. The Specific
Site Selection stage evaluated the revised long listed sites by applying a scoring system to generate a
shortlist comprising the most feasible sites for development of large scale OWTFs (using various biological
treatment processes). A ranking system was also developed to prioritize the suitability of sites under
evaluation.
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
The assessment was undertaken by EPD to determine which of the sites would be appropriate for the
development of large-scale OWTF, based on the following criteria:
Environmental impact (Air, Noise, Visual and Landscape, Water Quality and Drainage, and Ecology);
Engineering feasibility (e.g. accessibility, site constraints, time availability, etc.);
Financial viability (e.g. capital cost and operational cost);
Operability (e.g. proximity to users/producers, waste disposal and wastewater treatment, etc.); and
Social issues (e.g. compatible with broad planning intention for site and surrounding landuse, etc.).
A score from 1 to 5 representing the suitability (from low to high) for OWTF development against the
respective criteria for composting, Anaerobic Digestion and a combination of both technologies were
awarded for each site. The highest scoring four sites were recommended for further assessment, as
follows:
Siu Ho Wan, North Lantau
Sha Ling Livestock Waste Composting Plant (SLCP), Sheung Shui;
EcoPark Phase II, Tuen Mun; and
Tseung Kwan O Area 137, Tseung Kwan O.
A summary of the results of the evaluation is provided in Table 2.2 below.
Table 2.2: Summary of Assessment Results for Site Selection
Potential Site Environmental Engineering Feasibility
Financial Operability Social Issues
Siu Ho Wan *** *** *** *** ***
Sha Ling Livestock Waste Composting Plant
** ** * ** **
EcoPark Phase II ** * ** * *
TKO Area 137 * * ** * *
Source: EPD (2010) Pilot Plant Development of Biodegradable Waste Treatment Facilities (BWTF) – Investigation Final Report
Note: * Less Preferable, ** Preferable, *** Highly Preferable
Results of the assessment indicated that the Siu Ho Wan site is the most suitable for the development of
OWTF, followed by the SLCP site. These two sites are considered more favourable in view of their
relatively low environmental impacts, high engineering feasibility and operability, and less social issues.
The Siu Ho Wan site was chosen for the development of OWTF Phase 1 and the former Sha Ling
Livestock Waste Composting Plant (SLCP) site was selected for the OWTF 2. The EIA Report for the
Phase 1 project was approved by the Director of Environmental Protection on 24 February 2010, and the
preparation works for the project are underway.
As shown in Table 2.2 above, from the remaining sites, both the EcoPark Phase 2 and Sha Ling sites were
found to be ‘preferable’ in terms of environmental impact. However, initial consultation with PlanD
suggested that the development of large scale OWTF would not qualify as one of the twelve approved
categories of recycling process activities assessed under the EIA designated for the EcoPark (Phase II)
site. The Tseung Kwan O Area 137 site was considered to be ‘less preferable’ in terms of environmental
impact in the assessment (due to potential water quality issues), and despite having a large enough
available area, uncertainties about the site in terms of its availability and suitability of its neighbouring land
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
uses, let to this site being recommended only as a ‘fall-back’ option for the development of large-scale
OWTF.
The Sha Ling site is remote and does not have a large population nearby (and associated air, noise and
visual sensitive receivers). The site was used previously as a composting plant and does not encroach into
any environmental sensitive areas. From a rigorous consideration of alternative layout (see Section 2.4.2),
the OWTF 2 could be constructed within the previously developed area of SLCP to avoid felling of large
number of trees. The visual envelop is mostly confined by the ridgeline of nearby hills with few visual
sensitive receivers. Hence, there are no major environmental constraints for the development of OWTF 2 at
Sha Ling. In addition, the SLCP site falls within an area zoned “Government, Institution or Community
(G/IC)” on the Outline Zoning Plan (OZP) and PlanD has no in principal objection to the development of
OWTF at Sha Ling.
2.4.2 Optimisation of Layout
Different layouts of the facilities have been drawn up and considered. The layout of the facilities on the
OWTF 2 Project site has been optimised to maximise environmental benefits. In order to minimise the
footprint of the OWTF 2 project, the original concept design was reworked to occupy a smaller area. This
was achieved by reducing the number of digestion tanks from 5 to 3, changing the road layout, and altering
the configuration of key structures. In this way, the OWTF 2 site occupies the same area as the former
SLCP facility, minimising disturbance around the site, including vegetated areas. These design changes
have led to a reduction in the number of trees proposed to be felled from 153 trees in the original
preliminary layout to around 14 trees in the latest amendment (a 91% reduction).
Other design optimisations included the inclusion of green roofs, vertical greening, and landscape
screening to minimise visual impacts, reduce stormwater runoff, and increase amenity value for those
working at the site.
2.4.3 Alternative Organic Waste Treatment Options
As part of the Project alternative organic waste treatment technologies were appraised in order to
determine the most suitable option for adoption.2 These alternative organic waste treatment technologies
included:
Incineration;
Pyrolysis/gasification;
Anaerobic digestion;
Composting;
Conversion to solid biofuel
Conversion to liquid biofuel; and
Conversion to animal/fish feed.
From the above options, Anaerobic Digestion with biogas generation and composting of digestate was
selected as the preferred treatment option. This option was found to be the most suitable for the high
moisture content biodegradable organic waste in Hong Kong. It also has the greatest potential
_________________________
2 Working Paper 1 - Technology Evaluation and Key Elements of the OWTF
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
environmental benefits in terms of diverting waste from landfill, and recovery of energy and resources from
waste through production of compost / soil improvement products and renewable energy from biogas.
Composting is recommended to take place in enclosed tunnels provided with mechanical aeration. This will
allow effective control of the process and minimise impacts on air quality (dust and odour), noise and
impacts associated with vermin.
Two potential biogas use options have been identified. They are: Option A - onsite generation of electricity
and heat for use in on-site processes and facilities, with export of surplus electricity to the CLP network;
and Option B - export of biogas directly to the Towngas grid via a connection to the existing NENT Landfill
gas pipeline. With Option B there are two sub-options of biogas export:Option B(i) - with no onsite power
production; and Option B(ii) - with onsite power generation. The environmental performance between the
options is considered to be similar across the options. However, minor environmental benefits for
Landscape and Air Quality impacts may be achieved for Options B (i) and B (ii) over Option A. Either of the
options may be adopted for the Project and the chosen biogas utilisation option will be confirmed at later
stage of the Project. However, both cases are considered in the EIA with the worst case scenario assumed
for each assessment, as a conservative approach.
2.5 Implementation Programme
It is anticipated that the construction works of the proposed OWTF 2 will commence in mid-2015 and be
fully completed by 2017. The construction stages and provisional project program are shown in Table 2.3.
Table 2.3: Indicative Milestones for Key Project Stages
Description Tentative Date
Tender Phase 2014
Construction Start 2015
Construction End 2017
Operation Start 2017
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
3.1 Air Quality Impact
Potential air quality impacts associated with the construction and operational phase of the proposed Project
have been assessed in the EIA report. Representative Air Sensitive Receivers (ASRs) within 500 m of the
subject site have been identified and the worst case impacts on these receivers assessed. Suitable
mitigation measures, where necessary, have been recommended to protect the sensitive receivers and to
achieve compliance with legislative criteria and guidelines.
With the Government’s on-going and planned programmes to tackle various air pollution issues in Hong
Kong, it is anticipated that the future background air quality will improve. To predict the future background
air pollutant concentration, the Pollutants in the Atmosphere and the Transport over Hong Kong (PATH)
model, has been used. PATH background concentrations of the relevant pollutants for year 2020 and TSP
background level recorded in EPD’s Air Quality Monitoring Station have been adopted.
3.1.1 Construction Phase
Dust generated from construction activities is the primary concern during the construction phase. The air
quality model Fugitive Dust Model (FDM) was used to predict the air pollutant concentrations due to open
dust source impacts. With the implementation of the recommended mitigation measures as well as relevant
best practices stipulated in the Air Pollution Control (Construction Dust) Regulation, it has been assessed
(see Table 3.1) that there would be no exceedance of the hourly, daily or annual Total Suspended
Particulates criteria at any of the ASRs.
Table 3.1: Construction dust modelling results summary
Pollutant Averaging Period Current Criteria (µg/m3) Maximum concentration range for all ASR
(µg/m3)
Total Suspended Particulate (TSP)
1 hour 500 86 to 421
24 hour 260 70 to 128
Annual 80 68 to 79
Mitigation measures for dust control and relevant best practices as stipulated in the Air Pollution Control
(Construction Dust) Regulation were recommended to reduce dust impacts during construction phase. The
dust control measures are highlighted as:
Watering eight times per day, or once every 1.5 hours, at all active works areas in order to achieve a
dust suppression efficiency of 87.5%; and
All the stockpiles should be at least 80% covered with impervious sheeting to reduce windblown dust.
3.1.2 Operation Phase
The major sources of air pollution during the operation phase include, but are not limited to: emissions from
the burning of generated biogas in a combined heat and power (CHP) plant; emissions from an odour
treatment unit, which is used to treat odorous emissions, and; emissions from flaring, under equipment
outages emergency.
3. Summary of the Environmental Impact Assessment
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
During the operation phase, and with emission control equipment in place, all the assessed ASRs would be
in compliance with the relevant current and new AQOs and other relevant criteria for all emissions
modelled in this EIA. Table 3.2 indicates compliance of the emission standards against the Air Quality
Objectives (AQOs) as of January 2013 and Table 3.3 against the AQOs as of January 2014,.
Table 3.2: Summary of operation modelling results against the current AQOs
Pollutant Averaging Period Current AQO (µg/m3) Maximum concentration range for all ASR (µg/m3)
Nitrogen dioxide (NO2) 1 hour 300 155.0 to 187.3
24 hour 150 78.4 to 92.3
Annual 80 20.5 to 29.1
Respirable Suspended Particulate (RSP/PM10)
24 hour 180 121.0 to 126.9
Annual 55 43.0 to 43.6
Total Suspended Particulate (TSP/Dust)
1 hour 500(1) 68.0 to 206.3
24 hour 260 68.0 to 89.0
Annual 80 68.0 to 68.9
Carbon Monoxide (CO) 1 hour 30,000 2278.1 to 2280.4
8 hour 10,000 1458.7 to 1461.3
Sulphur Dioxide (SO2) 1 hour 800 65.9 to 66.7
24 hour 350 27.1 to 27.9
Annual 80 6.5 to 6.6
Odour 5 second 5(2) 0.00 to 1.59
Volatile Organic Compounds (VOC) 1 hour 60000(3) 2.5 to 9423.2
Hydrogen Chloride (HCl) 1 hour 2100(3) 0.3 to 5.8
Annual 20(3) 0.001 to 0.031
Hydrogen Fluoride (HF) 1 hour 240(3) 0.00 to 0.58
Annual 14(3) 0.0001 to 0.0031
1. EIAO-TM
2. Unit is OU/m3
3. Refer to Table 3.3 of the EIA Report
Table 3.3: Summary of operation modelling results against the new AQOs
Pollutant Averaging Period New AQO (µg/m3) Maximum concentration range for all ASR (µg/m3)
Nitrogen dioxide (NO2) 1 hour 200 155.0 to 187.3
Annual 40 20.5 to 29.1
Respirable Suspended Particulate (RSP/PM10)
24 hour 100 121.0 to 126.9(4)
Annual 50 43.0 to 43.6
Fine Suspended Particulate (FSP/PM2.5)
24 hour 75 90.7 to 96.6(4)
Annual 35 32.3 to 32.8
Total Suspended Particulate (TSP/Dust)
1 hour 500(1) 68.0 to 206.3
Carbon Monoxide (CO) 1 hour 30,000 2278.1 to 2280.4
8 hour 10,000 1458.7 to 1461.3
Sulphur Dioxide (SO2) 10 minute 500 161.5 to 163.3
24 hour 125 27.1 to 27.9
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
Pollutant Averaging Period New AQO (µg/m3) Maximum concentration range for all ASR (µg/m3)
Odour 5 second 5(2) 0.00 to 1.59
Volatile Organic Compounds (VOC) 1 hour 60000(3) 2.5 to 9423.2
Hydrogen Chloride (HCl) 1 hour 2100(3) 0.3 to 5.8
Annual 20(3) 0.001 to 0.031
Hydrogen Fluoride (HF) 1 hour 240(3) 0.00 to 0.58
Annual 14(3) 0.0001 to 0.0031
1. TM-EIAO
2. Unit is OU/m3
3. Refer to Table 3.3 of the EIA Report
4. Maximum predicted exceedance for all ASR is 2 per year. Maximum allowable exceedances per year is 9. Therefore, 24 hour
average RSP and FSP are compliant.
Recommended mitigation measures during operation phase include an exhaust treatment system and
stack for the CHP and odour treatment unit and all processes that might generate odour taking place within
enclosed facilities under negative pressure. Indoor air will be collected and treated to remove odours and
dust prior to venting through the flue stack. Odour treatment assumed and was assessed based on the
adoption of an Ultraviolet Light-C (UV-C) and ozone treatment system with second stage active carbon
filters. For the CHP, the preliminary design incorporates a combination of thermal and catalytic treatment
processes to remove pollutants from the exhaust gasses from the CHP. It is proposed that both the odour
treatment unit and the CHP emissions are directed to a flue to aid dispersion and minimise effects on
ASRs.
3.2 Hazard to Life
A hazard assessment has been carried out to evaluate the biogas risk to existing, committed and planned
off-site population due to the generation, transfer, storage and use of biogas during operation of the
Project.
Hazardous scenarios associated with the operations of the Project have been identified and assessed. A
quantitative risk assessment has been conducted to determine the impact of the identified hazardous
scenarios on the surrounding existing and proposed populations during the operation phase of the Project
in terms of individual and societal risks. The maximum individual risk remains below 1x10-5
per year at the
site boundary and hence meets the Hong Kong Government Risk Guidelines (HKRG) requirements. For
the societal risk, the potential loss of life (PLL) for the 2017 scenario and the 2017 scenario with proposed
developments are 6.42 x 10-6
per year and 8.48 x 10-6
per year respectively. Therefore the societal risk for
both scenarios are low and within the acceptable region as identified in HK EIAO Societal Risk Guideline.
Therefore, the assessment concludes that the risks due to operation of the Project are acceptable under
the individual and societal risk criteria set out in Annex 4 of the Environmental Impact Assessment
Ordinance Technical Memorandum (EIAO-TM).
The risks for both scenarios are within the acceptable region and therefore no mitigation measures are
necessary. Nevertheless, “Good Practices” and “recommended design measures” for the safe operation of
the Project are recommended to be carried out as far as reasonably practicable. Key recommended
measures are:
Safety markings and crash barriers will be provided to the aboveground piping, digesters and the gas
holder near the entrance;
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
The process plant building should be provided with an adequate number of gas detectors distributed
over areas of potential leak sources to provide adequate coverage; and
A 10m high boundary wall with fire resistance should be provided in the vicinity of the digester tanks,
gasholders and gas purification equipment.
3.3 Noise Impact
3.3.1 Construction Phase
The potential source of noise impact during the construction phase of the Project would be from the use of
Powered Mechanical Equipment (PME) for various construction activities, including demolition and removal
of the existing above ground structures of the SLCP and construction of proposed superstructure. PME
likely to be used at the Project site includes breakers, cranes, lorries and other vehicles, air compressors
and generators. A total of four representative noise sensitive receivers (NSRs) were identified for the
construction phase assessment. The prediction results indicate that the noise impact of unmitigated
construction activities from the project would cause exceedance of the relevant daytime construction noise
criterion of 75 dB(A) at most of the NSRs. Mitigation measures are therefore required to alleviate the noise
impacts generated during the construction phase. Recommended mitigation measures include:
good site practise to limit noise emissions at source ;
selection of quieter plant; and
use of movable noise barrier, enclosure and noise insulation fabric.
With the implementation of the mitigation measures, the construction noise levels at all representative
NSRs are predicted to between 63 dB(A) and 75 dB (A), which comply with the noise standards stipulated
in the EIAO-TM. Significant and residual construction noise impacts are therefore not anticipated in this
Project.
3.3.2 Operation Phase
During operation of the Project, potential noise impact from the operation of proposed fixed plant including
shredders, screw pumps, mixers, power supply systems, etc. are anticipated. Noise impact from planned
fixed plant can be effectively mitigated by implementing noise control measures at source during the
detailed design stage. In this study quantitative impact assessment has concluded that with the adoption of
the proposed maximum permissible Sound Power Levels at the proposed ventilation openings of 84 to 90
dB(A) during day-time, 80 to 84 dB(A) during evening and 79 to 81 dB(A) during night-time, the fixed plant
impact noise levels at all selected NSRs comply with the relevant noise criteria. Therefore, significant fixed
plant noise impact on the existing and planned NSRs is not anticipated.
3.4 Water Quality Impact
Water quality impact assessment has been carried out for areas within 500m of the Project site boundary
and other areas in the vicinity that might be impacted by the Project. Four fish ponds and two watercourses
were identified as inland water sensitive receivers.
The Project is located within the Deep Bay Water Control Zone. Effluent treatment is required prior to
discharge into the water courses in the Deep Bay Area, in order to meet the criteria of “no net increase in
pollution load requirement”. In practical terms this means that projects must either discharge to an existing
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
sewer system or be designed so that any discharge does not result in additional pollution load on Deep
Bay. The project proposes to adopt on site treatment prior to transfer into the existing sewerage network.
During the construction phase, potential water quality impact could be generated from site run-off, sewage
from workforce, and discharge of wastewater from various construction activities. With the implementation
of the mitigation measures, no adverse water quality impact on the water sensitive receivers from the
construction works for the Project is anticipated.
Sewage effluent from operation of the Project and all wastewater generated within the Project site,
including dewatered digestate from digesters and other process wastewater, will be collected and treated in
an on-site wastewater treatment plant to meet the standards identified in the Technical Memorandum
standard for discharge to the public sewer. The effluent will be transferred to the Shek Wu Hui Sewage
Treatment Works via a new sewer connection to the existing NENT sewerage network. Adverse water
quality impact on the water sensitive receivers is therefore not expected..
3.5 Waste Management Implications
Waste types likely to be generated during the construction phase of the Project could include approximately
25,000 m3
excavated materials (from site formation and foundation works) of which 4,500 m3 could be
reused on site, approximately 4,000 m3 C&D materials (from mixture of topsoil and dead vegetative
material and surplus concrete or grouting mixes), chemical waste (from maintenance of construction plant
and equipment) and approximately 39 kg per day of general refuse (from the construction workforce).
Provided that waste is handled, transported and disposed of using approved methods and that the good
site practices are followed, adverse environmental impacts would not be expected during the construction
phase.
During the operation phase of the Project, waste types to be generated could include 23 tonnes per day of
wastes generated from pre-treatment processes (from pre-treatment sorting of organic waste feedstock),
15 tonnes per year of chemical wastes (from maintenance of mechanical equipment) and general refuse
(from visitors and on-site staff). Provided that waste is handled, transported and disposed of using
approved methods and that the good site practices are followed, adverse environmental impacts would not
be anticipated during the operation phase.
Recommended mitigation measures for waste management are:
Good site practices such as staff training in proper waste management and chemical handling
procedures; providing sufficient waste disposal points; and employing licensed waste collectors.
Waste reduction measures such as sorting demolition debris and excavated materials from demolition
works to recover reusable/recyclable portions; and segregating and storing different types of waste in
different containers, skips or stockpiles to enhance reuse or recycling of materials and their proper
disposal.
Preparing and implementing an Environmental Management Plan describing arrangements for
avoidance, reuse, recovery, recycling, storage, collection, treatment and disposal of different categories
of waste to be generated from construction activities.
Potential sources of land contamination in the operation phase have been reviewed. It is estimated that a
limited amount of chemicals would be used or chemical wastes generated during the operation. Good
practices and response procedures for contamination prevention have been identified. With the
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
implementation of recommended practices and procedures, the potential for contamination due to
operation of the Project is expected to be minimal.
3.6 Ecological Impact
The Project Area comprises an existing developed concrete platform and plantation habitats adjacent to
some village development. In general, the area is not ecologically significant owing to the relatively low
ecological value of the habitats. The 14 trees proposed to be felled include 2 individuals of Acacia
auriculiformis, 3 individuals of Acacia confusa and 9 individuals of Musa x paradisiaca, which are all exotic
tree species of low ecological value. With the limited ecological value of the habitat, the ecological
significance due to the felling of 14 trees of low ecological value during construction phase is considered to
be minor. Overall, the ecological impact of loss of a very small area of plantation habitat within the Project
Area is therefore considered as minor.
Indirect impact on off-site habitat is also not considered to be significant due to lack of important ecological
resources. No ecological impact has been identified from the operation of the Project as all potential air
quality, noise and water quality impacts will be controlled to environmentally acceptable levels.
For precautionary purposes, erection of a temporary protective fence along the plantation area where trees
and vegetation would be retained within the Project Area is recommended during construction phase.
3.7 Fisheries Impact
A review and ground truthing exercise was conducted for fisheries impact and identified no commercial fish
culture resources or activities within the immediate area. With the recommended water quality control
measures and good site practice in place, the Project is unlikely to have any direct or indirect impacts on
existing ponds or related activities within the immediate area. Therefore, no fisheries impact arising from
construction and operation of the Project is anticipated and no fisheries-specific mitigation measures are
required.
3.8 Landscape and Visual Impact
3.8.1 Potential Impact on Existing Trees
There are approximately 458 trees within or in close proximity of the Project. None of the trees are
registered as Old and Valuable Tree (OVT). Approximately 441 trees are proposed to be retained in-situ;
approximately 14 are proposed to be felled due to unavoidable conflict with the proposed works and
transplantation is considered unsuitable; the remaining 3 trees are dead and in conflict with the proposed
works and are therefore proposed to be removed. Tree planting to compensate for the loss of existing
trees in terms of both quality and quantity as stipulated in ETWB TC(Works) No. 3/2006 is proposed and
incorporated into the landscape design within the Project site. The overall potential impact on trees is
considered negligible.
3.8.2 Landscape and Visual Impact
Sources of landscape and visual impacts will arise from removal of vegetation and demolition and
construction work associated with the proposed Project. With the implementation of mitigation measures,
the anticipated landscape and visual impacts are generally insubstantial, with slight negative impact
expected for some landscape resources, landscape character areas and visual sensitive receivers.
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
However, since the duration of the impact is only limited to the construction phase with a small area, such
residual impact is therefore considered acceptable. Overall, in terms of Annex 10, Clause 1.1 (c) of the
EIAO-TM, the landscape and visual impacts are acceptable with mitigation measures.
3.8.3 Mitigation Measures
Landscape and visual mitigation measures for construction phase are highlighted as follows:
Existing trees are retained whenever possible and protected during construction.
The construction site activities are carefully controlled to minimise impact such as light, noise, tree
felling and eyesores.
Landscape and visual mitigation measures for operation phase are highlighted as follows:
Amenity / compensatory planting will be utilised throughout the site
Vertical and rooftop greening will maximise green space and soften hard structures
3.9 Cultural Heritage Impact
3.9.1 Archaeology
A desk-based review identified that the proposed site area has no archaeological potential. Some
archaeological potential exists in the wider assessment area, but these areas with archaeological potential
would not be impacted by the proposed Project. If associated works are proposed within the identified
potential area of archaeological interest within the AA in the detailed design phase, an archaeological
investigation would be required prior to commencement of works. The scope and methodology of
archaeological investigation would need to be agreed with the Antiquities and Monuments Office (AMO)
prior to implementation.
At this stage there is no need for mitigation as no impacts are expected.
It is noted however that if antiquities or supposed antiquities are discovered in the course of excavation
works, the project proponent must arrange a temporary suspension of works in the affected area and notify
AMO immediately of the discovery. Course for further action would be agreed with AMO prior to
continuation of the works. Sufficient resource as well as time for conducting necessary archaeological
works should be provided by the project proponent if so required.
3.9.2 Built Heritage
No mitigation measures have been identified to be necessary for built heritage resources during the
construction and operation phases in the Built Heritage Impact Assessment. The construction and
operation of the proposed OWTF 2 will not cause any insurmountable adverse impacts and no cumulative
impacts will occur as a result of this Project.
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Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
An environmental monitoring and audit (EM&A) programme will be implemented during the construction
and operation of the Project to check the effectiveness of the recommended mitigation measures and
compliance with relevant statutory requirements. Details of the EM&A works have been specified in an
EM&A Manual. The EM&A Manual contains details of the proposed EM&A requirements, implementation
schedule of the environmental protection / mitigation measures, EM&A reporting procedures and complaint
handling procedures.
4. Environmental Monitoring and Audit
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15
Development of Organic Waste Treatment Facilities, Phase 2 EIA Executive Summary
This EIA study has identified and assessed the potential environmental impacts that may arise from
construction and operation of the Project in accordance with the guidelines of the EIAO-TM and the EIA
Study Brief. Based on the results of the assessments of the worst case scenario. The EIA study concludes
that with implementation of the recommended mitigation measures, the potential impacts arising from the
Project are considered to be environmentally acceptable and the Project would be in compliance with the
environmental legislation and standards. No significant adverse residual impacts from the Project are
anticipated. A comprehensive environmental monitoring and audit programme will be implemented to check
the implementation of mitigation measures and environmental compliance.
5. Conclusion
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J:\297677\REPORT\ENV\ES\130628\FIG 1.dgn DATE:27/06/2013 TIME: 12:07:46 USER: yim42169
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J:\297677\REPORT\ENV\ES\130911\FIG 2.dgn DATE:11/09/2013 TIME: 11:55:12 USER: yim42169
Project
Environmental Protection DepartmentThe Government of the Hong Kong
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