Wastewater treatment plant hydraulic performance improvement

Abstract

Sloka WWTP case study. The effluent suspended solids concentration is important parameter as the high fraction of organic matter, nitrogen and phosphorus are in suspended form, and to avoid suspended solids particle escaping from process tanks, thus preventing the waterbodies from point source pollution. The analysis of results from field studies show that treated wastewater effluent quality from clarifiers is unstable during the operation and activated sludge particle variation in concentration and size in effluent launder exist. The aim of study was to examine the individual effect of the scouring on sludge particle escaping from clarifier due to variation of incoming flow rate. The study describes results of a full-scale clarifier test for the design flow rate 250 m3/h, simulation results for the emergency flow 750 m3/h, when in operation only one process line. The results of practical application show, that to control the activated sludge particle escaping from secondary clarifier the local velocity profiles per each clarifier working zones can be used.