In China, power generation growth has driven power plant wastewater regulations to the level of zero liquid discharge. The Huaneng Group’s new wastewater treatment plant at the Changxing Power Station, Zhejiang Province, debuts the world’s first commercial application of forward osmosis-based zero liquid discharge, reducing both intake of local surface water and outflow of industrial wastewater.
China’s national dependence on coal for meeting a large portion of power needs has effected regulations surrounding environmental controls and water treatment. Regulation of power plant wastewater discharge, to the level of zero liquid discharge for streams such as the wastewater from coal power plant flue gas desulphurisation and blowdown from recirculating cooling systems, has become the norm.
Amid these new stringent discharge and water reuse requirements, the Huaneng Group, China’s largest power producer, finalised plans for the construction of a state-of-the-art ultra-supercritical coal fired power plant at the Changxing Power Station in Zhejiang Province, approximately three hours southwest of Shanghai. A new wastewater treatment plant was included for treatment of a combined waste stream, including the flue gas desulphurisation (FGD) blowdown wastewater stream and cooling tower blowdown. In order to meet water intake and discharge limits the new water plant would be designed for zero liquid discharge (ZLD) and complete liquid recovery for reuse as boiler makeup water.
Look out for the full article in 2016
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