Patent ID: 7501060
Filing Date: 2009-03-10
Classification: C02F,Y02W

Abstract:
1. A wastewater treating system comprising: a vessel defining a vessel space therein, said vessel space being partitioned into an activated sludge zone that is adapted to receive waste water and a body of an activated sludge therein, and a coarse filtering zone that is disposed downstream of and that is in fluid communication with said activated sludge zone for receiving bio-treated wastewater from said activated sludge zone; and a bed of biomass carriers colonized with microorganisms and disposed in said coarse filtering zone for further bio-treating the bio-treated wastewater from said activated sludge zone and for separating coarse suspended solids from the bio-treated wastewater in said coarse filtering zone; wherein said biomass carriers are in the form of cut pieces of a non-woven fabric material which is made from a stack of bound loosened-fiber webs.