March 28, 2005

State of Washington selects Zenon to supply world's largest MBR

OAKVILLE, ONT-Zenon Environmental has been selected to supply Washington state's King County with the world's largest membrane bioreactor (MBR). The ZeeWeed unit will treat an average daily flow of approximately 38 million gallons per day (MGD) (144,000 cubic metres) of municipal sewage, with peak flows up to 204,000 cubic metres or 54 MGD, serving over 100,000 households. The company has also received an order for a second smaller plant, bringing the total value of the order to $30 million. Zenon expects to receive the final purchase order by the end of May 2005. Design of the greenfield plants is currently underway with construction expected to begin in 2006. The larger Brightwater plant should be completed by 2010, with completion of the smaller Carnation plant scheduled for 2007. The Brightwater facility will be the first membrane plant owned by King County, whose existing two sewage treatment plants do not use membrane technology. Its wastewater treatment division serves 18 cities, 16 local sewer agencies and more than 1.4 million residents in three counties.

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