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Pollution > Advancements in Reverse Osmosis Membrane Technology

Advancements in Reverse Osmosis Membrane Technology

  30/07/2008
Advancements in SWRO membrane technology in the last 20 years have dramatically reduced energy usage, lowered overall treatment costs and raised water quality. Improvements achieved by Dow – enhanced membrane throughput, higher rejection of dissolved solids and organics, reduced pressure requirement – have helped cut the cost of water produced with reverse osmosis (RO) nearly threefold, while increasing water volume, purity and membrane service life. These factors have become increasingly important to water treatment plant specialists like Degrémont.

 

Combined with our expertise in water treatment system design, the high performance of FILMTEC membrane technology allows us to provide high purity water to the residents of Perth in an affordable way,” said Gontzal Lorenzo of Degrémont, a joint venture partner responsible for design and construction at Perth.  The plant was built by a joint venture between Multiplex and Degrémont.

The Perth desalination facility, which is powered by wind, draws seawater from Cockburn Sound. The feedwater is pre-treated and then passed through a two-pass RO system which helps to achieve high-quality desalinated water. After the first-pass, which consists of six SWRO membrane trains, the permeate passes through six second-pass BWRO membrane trains.  The recovery rates of the first and second passes are 45 percent and 90 percent respectively. After post-treatment, the water enters the Integrated Water Supply Scheme (IWSS), Australia’s largest public water supply system, for distribution.

The specific energy consumption (SEC) of the first pass seawater reverse osmosis (SWRO) component is 2.6 kWh/m3, which, along with other energy-reducing measures, contributes to a total plant SEC of less than 3.8 kWh/m3.  This includes energy for the drinking water forwarding pumps.

The Perth plant shows that desalination can be an effective and affordable option for producing water in water-stressed regions, as well as in municipalities looking to diversify their water supply sources. Dow is focused on continuous advancements in FILMTEC membrane technology and in manufacturing capabilities to enable more large-scale desalination and water purification projects worldwide.

 

 





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Supplier: Dow Water & Process Solutions

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