SPECIFIC ORGANIC AND NUTRIENT LOADS IN STABILIZED SLUDGE FROM MUNICIPAL TREATMENT PLANTS

By means of theoretical considerations and of statistical evaluations, specific organic and nitrogen loads in separately stabilized sludge h ave been found to be in the range of 16 to 20g VSS/PE/d and of 1.1 to 1.5 gN/PE/d respectively. About 0.6g P/PE/d are removed from the waste water in activated sludge plants without chemical or enhanced biologic al P removal. By using the single-stage activated sludge process witho ut primary sedimentation and without separate sludge stabilization, al most complete nitrogen removal can be achieved, but specific organic a nd nitrogen loads in the waste sludge are up to two times higher than in separately stabilized sludge. Copyright (C) 1996 IAWQ.