TEXAS UTILITY REMOVES TRACE COPPER FROM COOLING TOWER BLOWDOWN A utilities company in Texas contacted Evoqua Water Technologies in response to revised NPDES permit limits. The customer’s production generated a cooling tower blowdown effluent with copper in excess of the surface water discharge limit. The source of the copper was identified as the system makeup water along with leaching from the materials of construction within the system. The new permit requirements called for a substantially lower limit of 53 parts per billion (ppb) copper in the effluent discharge. To meet permit requirements, Evoqua proposed the use of selective ion exchange for copper removal. Initial laboratory and pilot testing indicated that a treatment train of activated carbon and selective ion exchan

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