Operating and chemical costs improved significantly at the Guadalupe Power Plant in the US state of Texas after an electrodeionisation (EDI) system replaced on-site regenerated ion exchange resin beds in the power plant water treatment system. Designed for zero liquid discharge (ZLD), the water treatment system includes an evaporator that processes cooling tower blowdown, mainly for wastewater concentration. EDI further refines high-quality condensate from the evaporator; however the condensate created new challenges in terms of feed composition and temperature range for the EDI process. EDI replaces traditional on-site regenerated demineralisation with ion exchange resin after the evaporator, which reduced environmental liability associated with acid and caustic regeneration of the IX resin beds. Click Here For Complete Article Text
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