Pilot Plant Study on Development of Desalination Facilities

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Task / Deliverable Date
Commencement of Consultancy <strong>Study</strong> (Agreement No. CE
97/2002)
Award of Contract for the Supply, Installation and
Operation of <strong>Pilot</strong> Desalination <strong>Plant</strong> (Contract No.
9/WSD/03)
Award of Contract for the Seawater Sampling and
Laboratory Testing Programme (Contract No. ST/008/03)
Award of Contract for the Raw and Treated Water
Sampling and Laboratory Testing Programme at Tuen Mun
site (Contract No. SO/WSD 7/2004)
Commencement of <strong>Pilot</strong> Desalination <strong>Plant</strong> Operation at
Tuen Mun site
Commencement of Raw and Treated Water Laboratory
Testing Programme at Tuen Mun site
Completion of <strong>Pilot</strong> Desalination <strong>Plant</strong> Operation at Tuen
Mun site
Award of Contract for the Raw and Treated Water
Sampling and Laboratory Testing Programme at Ap Lei
Chau site (Contract No. SO/WSD 132/2005)
Commencement of <strong>Pilot</strong> Desalination <strong>Plant</strong> Operation at
Ap Lei Chau site
Commencement of Raw and Treated Water Laboratory
Testing Programme at Ap Lei Chau site
Completion of <strong>Pilot</strong> Desalination <strong>Plant</strong> Operation at Ap Lei
Chau site and Contract No. 9/WSD/03
2-May-2003
12-Feb-2004
22-Mar-2004
8-Jun-2004
7-Dec-2004
21-Dec-2004
7-Dec-2005
3-Feb-2006
8-Feb-2006
7-Mar-2006
5-Feb-2007

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1 The pre-treatment systems were (1) Zenon ZeeWeed ® 1000 Submerged Ultrafiltration System, (2)
Norit X-Flow Pressurised Ultrafiltration System, and (3) a 2-stage Granular Media Filtration System.
2 The SWRO membrane brands were (1) Hydranautics, (2) Dow, and (3) Toray.
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3 Silt Density Index (SDI) is an indication of the quantity of particulate matter in water. It can be used
to determine effectiveness of filtration processes in respect of particulate removal and fouling
tendency of water treatment equipment based on filtering through a 0.45 µm filter pad for a timed
period. Further details available in ASTM D4189.
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Ability to Meet Ability to Meet SDI
Turbidity for 95th
percentile
for 95th percentile
Target Objective Target Objective
Goal
Goal
(0.2 NTU) (1 NTU) (3.0) (4.0)
Tuen Mun - Pre-treatment,
Submerged UF
No Yes No Yes
Tuen Mun - Pre-treatment,
Pressurised UF Yes Yes No Yes
Tuen Mun - Pre-treatment,
Conventional GMF Yes 6 Yes 6 No No 7
Ap Lei Chau - Pre-treatment,
Pressurised UF Yes Yes No Yes
Ap Lei Chau - Pre-treatment,
Conventional GMF Yes Yes No No 7
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4 The filtrate quality shall meet the typical minimum SWRO process requirements (i.e. turbidity of

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Site Tuen Mun
representing feed seawater
under strong seasonal
influence from Pearl River
estuary during summer wet
seasons
Ap Lei Chau
representing feed seawater
with oceanic nature and not
influenced from any freshwater
discharges
General Pre-treatment recovery – 90% to 95% (or per supplier’s
recommendations)
Pre-treatment –
Ultrafiltration
Pre-treatment –
Granular Media
Filtration 10
General
Parameters for
SWRO
Processes
Site-specific
Parameters for
SWRO
Processes
Pre-treatment filtrate quality fulfilling minimum SWRO process
requirements (typical value for turbidity of

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13 The other four tested materials were bitumen-lined mild steel, unplasticised polyvinyl chloride
(UPVC), PVC-lined galvanised steel and medium density polyethylene (MDPE).
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