INVESTIGATION OF SEDIMENTATION PROPERTIES OF SLUDGE LIQUOR AT WASTEWATER TREATMENT PLANTS

Subject: the article focuses on investigation of kinetics of sludge liquor sedimentation and on determination of its characteristics; the relations between parameters of activated sludge such as mixed liquor suspended solids (MLSS), sludge-water phase boundary and sedimentation rate are highlighted. Research objectives: research on kinetics and parameters of activated sludge sedimentation at city wastewater treatment plants (WWTP). Materials and methods: field tests of sedimentation process of real sludge samples from different WWTP in laboratory cylinders are conducted, mathematical and graphical processing of the obtained results is carried out. Results: kinetics of sedimentation of sludge liquor with MLSS equal to 0.6…6.2 mg/l is described, main dependencies between sedimentation characteristics of activated sludge are obtained. The regularities of sedimentation of sludge with small and large MLSS are noted. Conclusions: kinetics of sludge sedimentation for various MLSS is determined, the rate of elimination of “sludge-water” phase boundary is determined.