Patent ID: 6010629
Filing Date: 2000-01-04
Classification: C02F,Y02W

Abstract:
A microorganism foaming and bulking controlling method for waste water treatment, comprising the steps of:treating an industrial or domestic waste water that contains foam causing microorganisms, including Microthrix parvicella, by an activated sludge treatment process, wherein said activated sludge treatment process comprises the steps of:(a) treating said waste water with a primary sedimentation by which most suspended solids are separated out;(b) passing said waste water after the treatment of said primary sedimentation to at least one secondary aeration basin for biological aeration process wherein activated sludge is introduced;(c) passing said waste water coming out of said secondary aeration basin to at least one clarifier for clarifying treatment to produce effluent of clean water;injecting or adding a polymer in said waste water before said waste water entering into said clarifier and after coming out from said primary sedimentation; andremoving said foam causing microorganisms from said aeration basin by the presence of said polymer in said aeration basin, wherein said foam causing microorganism floc loses buoyancy thereof and escapes said aeration basin, whereby a defoaming effect is achieved.