|Haynes Generating Station - the water in the
foreground is the cooling water intake channel
Los Angeles Department of Water and Power (LADWP) and the
Long Beach Water Department
The LADWP began operation of their desal pilot plant at the Hayes
Generating Station in Long Beach in September of this year. This
Research and Development project produces 300,000 gallons per day and
studies energy consumption. This $15 million program has been funded
through state and federal grants ($8 million) and the Long Beach Water
Department ($7 million) by the rate payers.
At this plant, water is taken from the Haynes intake channel and then
passes through pretreatment (silt and other larger articles are filtered out).
Next, half of the pretreated water goes through a 1 pass Reverse Osmosis
(RO) and the other half goes through a 2 pass nanofiltration. Both are then
combined and mixed with the brine before discharge back into the intake
channel. Click here for a diagram of the research plant.
The purpose of the plant is to study the energy use of the two methods of
desalination to find a more energy-efficient desal technology. The 2 pass
nanofiltration system is a new design by the Long Beach Water Department
and they believe that it is more efficient on energy as well as water quality
Long Beach Water Department's energy consumption desal pilot plant
The Long Beach Water Department is also planning the construction of
another Research and Development desal plant which will study subsurface
beach wells for seawater intake and discharge. This goal of this plant is to
study hydraulics and filtration (capacity and water quality). They have
recieved $2 million through Proposition 50 (CA) and plan to build this plant
in the next 2-3 years.
Click here to go to the City of Long Beach desalination website