2013•Advanced materials researchOpen access

A Comparative Research on Sludge Properties under Different Wastewater Quality Conditions

Xue Song Li, Meng Zhao, Mei Zhang

Abstract

Objective: to explore the wastewater quality conditions which made sludge bulk easily, and the sludge properties when sludge bulking happened. Methods: wastewater was treated by SBR process, and sludge volume index (SVI) in different wastewater quality conditions was determined by controlling water temperature, dissolved oxygen (DO) and pH value. Conclusion: under low temperature conditions, effect of DO concentration on SVI was great; and the lower DO concentration, the more serious sludge bulking. But pH value had less effect on SVI, and only mild filamentous sludge bulking happened on activated sludge at low pH value (pH=6.0-6.5). Moreover, SVI tended to be steady at late period of operation, and the average was 203 mL/g.

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Key concepts: Wastewater, Sludge bulking, Mixed liquor suspended solids, Activated sludge, Pulp and paper industry, Sewage treatment, Waste management, Volume (thermodynamics)