Contrafast Concentric system from Siemens combines the treatment process in a single tank. Photo: Siemens AG

SINGAPORE, July 4, 2011 -- Under a new contract, Siemens Water Technologies in India will provide a water treatment system for Torrent Power Limited's 382.5 megawatt UNOSUGEN gas-based combined cycle power plant in Surat, India.

Siemens will supply two Contrafast Concentric systems, which will treat water from the Tapi River and produce up to 4 million gallons per day (15,142 m³/day) of cooling tower make-up water. The system, which is part of a capacity expansion at the power plant, is scheduled to be commissioned in September 2012.

With properly treated water, the potential for scaling in the cooling tower is significantly reduced. This reduces cooling circuit cleaning requirements, extends the life of the cooling equipment, and reduces the cooling tower blowdown flow to the environment.

The Siemens Contrafast Concentric system is a highrate clarification and thickening process that consists of a solids contact reaction chamber, clarifier with tube settler and gravity thickener in a single tank. The entire process is contained in a single, unitized steel basin, and is designed to simplify installation time and reduce cost. The design allows up to an 80% reduction in footprint compared to conventional clarification systems, and the process enhances suspended solids' removal, lime softening and heavy metals removal.

Siemens Water Technologies in India will engineer and source the system hardware, with design review and on-site technical services provided by Siemens Water Technologies in Ames, Iowa, U.S.A.

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