Patent ID: 8920644

Claim:
A system for producing drinking water from wastewater comprising: an inlet for directing influent wastewater into an ozonation zone configured to ozonate the influent wastewater; an injector disposed downstream from the ozonation zone and configured to inject powdered activated carbon (PAC) to the ozonated wastewater; a contacting zone disposed downstream from the injector and configured to mix the injected PAC with the ozonated wastewater; a membrane filtration unit disposed downstream from the contacting zone and configured to separate treated wastewater from a PAC rich concentrate, the membrane filtration unit including a treated water outlet and a PAC rich concentrate outlet; a recirculation line operatively connected to the PAC rich concentrate outlet and the contacting zone and configured to direct the PAC rich concentrate from the membrane filtration unit to the contacting zone; and wherein the contacting zone contains a mixture of injected PAC, recirculated PAC rich concentrate, and wastewater and wherein the wastewater contained in the contacting zone has a Ct value of greater than 300 mg·min/l.