Patent ID: 6221253
Filing Date: 2001-04-24
Classification: B01D,C02F,Y02W

Abstract:
A method for accelerating sludge sedimentation comprising the steps of;permanently magnetizing particles of magnetic powder to form particles of permanently magnetized powder;adding said particles of permanently magnetized powder to an aeration chamber containing a mixed liquor;said mixed liquor having a volatile suspended solids concentration;said particles of permanently magnetized powder being at least 3% by weight with respect to the volatile suspended concentration of the mixed liquor in the aeration chamber;said mixed liquor including activated sludge and waste water;mixing said particles of permanently magnetized powder with said mixed liquor to form a mixture;transferring said mixture to a sedimentation chamber;sedimenting said activated sludge in said sedimentation chamber to form a sedimented sludge;separating said sedimented sludge from said mixed liquor; andreturning a portion of said sedimented sludge to said sedimented sludge to said aeration chamber as a return sludge.