React-pHª Improves pH in Carbon Effluent

An electronics company in the northeast United States had been using granular reactivated carbon to treat 500-1000 gallons per minute (gpm) of groundwater for volatile organic compound (VOC) removal. With this process, regenerated carbon backwash water showed pH elevation above 9.0, a level unacceptable for direct discharge to the publicly owned treatment works (POTW). This resulted in the need for a backwash water holding tank and restricted permissible backwashing time. The company's objective was to ensure an acceptable discharge pH to allow backwashing for a longer time to remove fines and avoid using the holding tank.

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