A mechanical pretreatment of waste-activated sludge for H2S decrease on anaerobic digestion

Abstract

To decrease the H2S and induce effective anaerobic digestion of waste-activated sludge (WAS), the micro-organisms concentration within the sludge were ruptured by a mechanical jet stream and smashed under a pressure of 30 bar. Using this procedure, the H2S concentration was decreased from 30-50 mg/l of intact WAS to 27-240 mu g/l.