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Effect of Chemical Conditioning on Flotation and Thickening Efficiencies of Sewage Sludge  

Lee, Chang-Han (Department of Environmental Engineering, Catholic University of Pusan)
Ahn, Kab-Hwan (Department of Environmental Administration, Catholic University of Pusan)
Publication Information
Journal of Korean Society of Environmental Engineers / v.31, no.9, 2009 , pp. 743-748 More about this Journal
Abstract
Chemical sludge conditioning is widely used to improve the dewatering efficiency. It is treated with commonly used conditioners, and then thickened and dewatered with a mechanical device. This paper aims to examine the flotation and thickening efficiencies of sewage sludge for conditioning conditions, such as unaerobic storage time, kinds of coagulant and dosages, and flotation conditions, such as sludge concentration and A/S ratio, using an dissolved air flotation apparatus. Experimental results showed that the specific surface area and specific resistance to filtration (SRF) were significantly increased and the flotation and thickening efficiencies were decreased with anaerobic storage time. However, the flotation and thickening efficiencies faintly decreased in sewage sludges conditioned as $Al_2(SO_4)_3$, $Fe_2(SO_4)_3$, and PSO-M. Flotation and thickening efficiencies in conditioned sewage sludge could be sustained up to 96% at A/S ratio of 0.01 mL/mg or over.
Keywords
Sewage sludge; Flotation; Thickening; Microbubble; Conditioning; DAF;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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