Patent ID: 8021556
Filing Date: 2011-09-20
Classification: C02F

Abstract:
1. A method for clarifying wastewater, comprising: treating wastewater containing contaminants comprising soluble organic compounds and insoluble organic compounds with a paculant admixture comprising a cationic coagulant polymer and powdered activated carbon, the cationic coagulant polymer comprising at least one member selected from the group consisting of polydiallydimethylammonium chloride, poly quaternary amine, and a starch-based organic polymer; delaying an addition of a flocculent to the wastewater for a period of delay of at least 2 seconds after said treating of the paculant admixture sufficient to achieve (i) microcoagulation of the cationic coagulant polymer with the contaminants to form coagulated particles having an effective mass and cationic charge to react with an anionic flocculent to be added thereafter and (ii) absorption of the soluble organic compounds on the powdered activated carbon; adding the anionic flocculent and permitting the anionic flocculent to react with the coagulated particles to form a sludge, comprising agglomerated particles including said coagulated particles and said powdered activated carbon, of sufficient size for mechanical removal; and removing the sludge to provide clarified wastewater.