Projects -
Membrane Filtration
City of Abbotsford -
Norrish Creek Membrane Filtration Plant
  The Fraser Valley
Regional District is the bulk water supplier to the District of
Mission and to the City of Abbotsford. The total combined population
exceeds 130,000 and is growing annually.
Norrish Creek is the
principal water source for the area. Water quality issues included
seasonal turbidity, seasonal colour, and the risk of protozoa (Giardia
and Cryptosporidium).
Dayton & Knight Ltd. are the
consulting engineers for the Water Treatment Program which includes a
30 ML/d Membrane Filtration Plant.
 The membrane program consisted of:
The membrane filtration
plant operates in parallel with an 83 ML/d slow sand filtration
plant. This innovative combination of processes, specifically
designed to meet the seasonal water quality, has resulted in a very
economical treatment system.
The treatment plant includes a
2,280 m3 (500,000 gallon) clearwell for treated water
storage, as well as a water treatment building housing the mechanical
and electrical equipment, and an office and laboratory.
The membrane plant is designed
to be expanded in 6 MGD stages to 24 MGD. The first stage, which was
commissioned in August 2004, includes a Zenon membrane system with
coagulant addition.
Dayton & Knight Ltd. has completed
on-site pilot membrane filtration investigation for several clients.
City of Revelstoke
 In response to a waterborne disease (giardiasis,
cryptosporidiosis) outbreak in the fall of 1995 which affected several
hundred people, Dayton & Knight was retained by the City of Revelstoke
to review potential filtration technologies to minimize further
distribution system contamination.
 The work included a four month on-site pilot scale micro membrane
filtration study of the source water. The program involved monitoring
the flux rate, pressure loss and water quality parameters such as
turbidity, colour, total organic carbon and UV 254 as well as the
recovery of the transmembrane pressure loss with backwash and
clean-in-place procedures.
The City proceeded with the construction of a water
treatment plant using micro membrane filtration in 1999.
Investigation
of Micro & Ultra
Membrane Performance on BC Drinking Water Quality
 Dayton & Knight managed and partially funded a research
study conducted by the Universities of British Columbia and Alberta
on micro and ultra membrane performance on Seymour Lake water.
The goal was to demonstrate for B.C. Municipalities the possible
role of membrane filtration for treatment of surface water sources.
Seymour Lake is one of the Greater Vancouver Regional District's
three water sources serving Greater Vancouver.
Four pilot membrane
systems supplied by Zenon, Aquasource, Leopold and US Filter Memcor
were housed at the Greater Vancouver Water District's Seymour test
facility. The evaluation included water treatment efficiency,
flux rates, chlorine demand, disinfection byproduct formation and
the role of pre-treatment such as dissolved air flotation and
powdered activated carbon.
The water treatment efficiency looked at removal of
cryptosporidium and giardia sized particles as well as turbidity and
organic removal. The work included assistance from the B.C. Hydro
Water and Wastewater Centre on energy efficiency.
Sunshine Coast Regional District
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Close up of
membrane filter
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The Sunshine Coast Regional District supplies water to
over 20,000 consumers from the Chapman Creek source.
The source issues
include seasonal turbidity and colour. The colour is an indication of the
presence of organic matter which, with disinfection, results in the
formation of disinfection byproducts which are a long term health risk.
Bench scale testing of membrane filtration found that acceptable colour
removal was achieved with a 10,000 molecular weight cutoff (MWCO) membrane
but not a 50,000 MWCO membrane. An onsite pilot scale study will begin in
August 1998 through to November 1998 to confirm both the colour removal
efficiency and filter operation and estimate the cost of a full scale
plant. |
For more information about Dayton & Knight Ltd.'s
capabilities and experience on membrane filtration, please contact
Sean
Brophy (sbrophy@dayton-knight.com
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