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For Sai Kung District Council Meetingon 5 July 2016
SKDC(M) Paper No. 116/16
Progress of the Proposed Tseung Kwan O Desalination Plant Project
1 Purpose
This paper aims to provide the Sai Kung District Council (SKDC) with an update on the
progress of the proposed Tseung Kwan O (TKO) desalination plant project, and seek the
SKDC’s support for the proposed amendment to the TKO Outline Zoning Plan for the area
earmarked for the proposed desalination plant in TKO Area 137.
2 Background of the Project
2.1 A reliable fresh water supply is of paramount importance to sustaining Hong Kong’s
development and economic growth. However, our fresh water resources are facing
various challenges, including increasing water demand arising from population and
economic growth, fluctuating local yield, climate change, as well as keen competition for
the Dongjiang (DJ) water resource due to the rapid economic development in the Pearl
River Delta Area.
2.2 The total quantity of water extracted from DJ for water supply is increasing every year.
The water resource available from DJ and the yield collected from the local water
gathering ground may not be able to meet the water demand of Hong Kong during a
severe drought with a return period of 1 in 100 years. Moreover, climate change will
bring about extremely dry weather at more frequent intervals and increase the likelihood
of consecutive droughts. To safeguard water security in Hong Kong, we need to develop
an alternative water resource by seawater desalination which is not susceptible to climate
change.
- 2 -
2.3 In December 2012, we engaged consultants to commence a planning and investigation
(P&I) study for the proposed desalination plant in TKO Area 137. The P&I study was
completed in 2015. It confirmed the technical feasibility of the project including its
environmental viability and provided a preliminary design of the plant.
2.4 On 6 January 2015, we briefed Members of the Sai Kung District Council about key
results of the P&I study and obtained their support for the proposed review, design and
associated site investigation works for the project.
2.5 Subsequently, the environmental impact assessment (EIA) for the project was completed
in May 2015 and the EIA report was approved under the Environmental Impact
Assessment Ordinance by the Environmental Protection Department (EPD) in November
2015. On 4 December 2015, EPD issued an Environmental Permit (EP) for the
construction and operation of the desalination plant.
2.6 In November 2015, we engaged consultants to proceed with the review, design and site
investigation works for the first stage of the proposed desalination plant at TKO. The
first stage of the plant will have a water production capacity of about 135 million litres
per day (Mld) with provision for expansion to 270 Mld to meet 5 to 10 percent of the
overall fresh water demand of Hong Kong.
3 Design of the First Stage of TKO Desalination Plant
3.1 The first stage of the TKO desalination plant project comprises the following key
components:
- 3 -
a) construction of the first stage of the proposed desalination plant with a water
production capacity at 135 Mld with provision for future expansion to the ultimate
water production capacity up to 270 Mld and associated facilities;
b) formation of a 10-hectare site earmarked at TKO Area 137 for the desalination
plant and associated facilities with the ultimate water production capacity at 270
Mld;
c) construction of the intake and outfall facilities of the proposed desalination plant
with capacities catering for the ultimate water production capacity of the proposed
desalination plant at 270 Mld;
d) associated works including environmental impact mitigation, slope stabilisation and
landscaping works; and
e) associated mainlaying works for conveying the fresh water produced at the
proposed desalination plant to existing fresh water service reservoirs.
The project layout plan is shown in Annex 1.
3.2 The proposed plant will adopt the latest seawater reverse osmosis (SWRO) treatment
technology. The desalinated water will comply with the World Health Organization’s
“Guidelines for Drinking-water Quality” (WHO 2011). A diagram on the proposed
seawater desalination process is enclosed in Annex 2. The consultants are looking into
various options of optimizing the energy consumption of desalination with innovative
design features, in terms of pre-treatment process of lower energy consumption, optimal
sizing of plant and equipment, and advanced energy recovery system for greater energy
efficiency. In addition, the plant will adopt suitable architectural and landscaping design
to harmonize with the surrounding environment. A preliminary layout of the desalination
plant is shown in Annex 3.
- 4 -
3.3 We are carrying out detailed design for the water mains by in-house resources. The
works will involve laying of about 9.5 kilometres of water mains with a diameter of 1 200
millimetres (mm) along Wan Po Road, Po Hong Road and Tsui Lam Road, for
transferring water produced from the proposed desalination plant to the existing Tseung
Kwan O Primary Service Reservoir and other existing service reservoirs. The proposed
alignment of the water mains is shown in Annex 1. The alignment has been designed to
minimse impact to the road traffic and trenchless construction method will be adopted for
laying of water mains along busy road junctions and some critical road sections where
necessary.
4 Impact Assessments and Arrangement for the Construction Stage
4.1 The approved EIA concluded that with the implementation of appropriate mitigation
measures, no unacceptable environmental impacts are envisaged. Prior to commencing
construction works for the proposed desalination plant, we will require the contractor to
prepare and submit an Environmental Monitoring and Assessment Plan as per the EP
requirements to EPD for approval. During the construction stage of the proposed
desalination plant, we will implement relevant environmental mitigation measures and
monitoring for ensuring compliance with the EP requirements as well as relevant
environmental protection regulations.
4.2 We have carried out a traffic impact assessment (TIA) for the proposed water mainlaying
works. The TIA results reveal that the mainlaying works through implementation of
appropriate temporary traffic management schemes would not cause any significant
impact on the traffic. We will closely liaise with the Transport Department, Hong Kong
Police Force and Highways Department for taking into account their comments and
requirements for the TIA. During the construction stage, we will also keep close contact
- 5 -
with relevant government departments and require the contractor to implement the
temporary traffic management measures in order to minimise the traffic impact arising
from the mainlaying works.
5 Way Forward
We plan to submit funding application to the Legislative Council Finance Committee in due
course according to the established procedure for public works projects. If all the work
proceeds smoothly, it is expected that the mainlaying works and the plant construction can
commence in 2017 and 2018 respectively for commissioning of the first stage of the proposed
desalination plant by 2020-2021 the earliest.
6 Advice Sought
Members are invited to offer comments, and lend support to the project and the proposed
amendment to the TKO Outline Zoning Plan for the area earmarked for the proposed TKO
desalination plant in TKO Area 137.
7 Attachments
Annex 1 Project layout plan
Annex 2 Seawater desalination process diagram
Annex 3 Preliminary layout of the first stage of the proposed desalination plant
Water Supplies Department July 2016
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