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Sludge Dewatering Property in Municipal Wastewater Treatment Plant

Wan Yao-qiang

Abstract

Dewatering characteristics of thickened sludge,mixed sludge and digestive sludge from municipal wastewater treatment plant through flocculation test was studied.Sludge dewatering behaviors of polymeric ferric sulfate(PFS),sodium acrylate-acrylamide copolymer,methacrylate-methacrylate copolymer and polyacry lamide(PAM) were compared.Results showed that thickened sludge need the least flocculant while digestive sludge need the most flocculant,with all the flocculants having optimum dosages.Based on flocculant effect and economic analysis,PAM was the best flocculant,with optimum dosage of 2.45kg/t(dry sludge).Filter pressure,pH of sludge and mixing speed greatly affected the flocculant effect,which should be selected carefully by test.

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Key concepts: Flocculation, Dewatering, Pulp and paper industry, Chemistry, Wastewater, Waste management, Sewage treatment, Ferric