High Purity Boiler Water Production Using Municipal Wastewater at a Combined Cycle Gas-Fired Generating Station

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Courtesy of Eco-Tec Inc.

Abstract
The recovery of wastewater for industrial uses presents many challenges for the design and operation of water treatment equipment. Since the term wastewater can be applied to a wide range of water sources from municipal sewage to storm runoff to industrial discharge water, the water characteristics may have great variability. As such, the equipment to treat wastewater must be robust and forgiving. When these wastewaters are used to produce ultra high purity boiler feedwater, the challenges become magnified.

This paper describes a water treatment system, fed with municipal wastewaters, for the production of high purity boiler feed makeup water at a combined cycle gas-fired power plant, and the experiences of the plant operator after five years of continuous operation. This fully automatic water treatment system consists of micro-media filtration, reverse osmosis and a short bed ion exchange demineralizer/polisher, and requires minimal operator attention and maintenance.

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