首页|Instights into the respective role of oxidation and flocculation conditioning for enhancing paper sludge dewaterability
Instights into the respective role of oxidation and flocculation conditioning for enhancing paper sludge dewaterability
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Due to the high hydrophilicity of extracellular polymeric substances (EPS) and colloidal property of sludge solids, applying efficient methods has attracted much attention for enhancing sludge dewatering. The oxidation and following flocculation of paper activated sludge is usually used alone or in combined conditioning with other pretreatments for sludge dewatering deeply. However, few studies are reported on the systematic comparison and role positioning of oxidation and flocculation conditioning. The results indicated that the sludge dewaterability of the combined potassium permanganate (KMnO4) and ferric chloride (FeCl3) conditioning was enhanced significantly with FeCl3 dosage decreasing by 75 % compared with individual FeCl3 conditioning. The mechanism is a synergistic effect of oxidation stripping and flocculation re-construction: larger agglomerated sludge flocs formed, and more bound water was released. FeCl3 played a more important role than KMnO4 for sludge dewaterability. The contents of bound water, S-EPS, maximum shear stress, and hysteresis area were the critical factors for sludge dewaterability. These findings provided further understanding of the combined oxidation and flocculation processes for improving dewaterability.
Paper sludgeSludge dewaterabilitySludge conditioningOxidantFlocculantRheology
Xin Zhang、Hongtao Zhang、Tao Liu
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School of Environmental and Natural Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang 310023, China
Zhejiang Shanying Paper CO., LTD, Jiaxing, Zhejiang 314000, China
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