Patent ID: 6210588
Filing Date: 2001-04-03
Classification: B01D,C02F

Abstract:
A physico-chemical process for treating effluent comprising the steps:subjecting the effluent to coagulation that forms microflocs;adding polyelectrolyte to the coagulated effluent to produce flocculation causing agglomeration of the microflocs into flocs;subjecting the resulting flocculated effluent to settling for separating flocs and interstitial water components thereby forming densified sludge and clarified water;recycling a portion of the sludge to the flocculated effluent during the step of flocculation, the recycled sludge serving as a contact mass for the flocs;at least a portion of the polyelectrolyte added during flocculation being injected into the densified sludge prior to being recycled to the flocculated effluent during flocculation.