期刊
CHEMOSPHERE
卷 218, 期 -, 页码 930-940出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.11.169
关键词
Alkalinity; Extracellular polymeric substances (EPS); Polyaluminum chloride; Solids concentration; Sludge dewaterability
资金
- National Natural Science Foundation of China [51678546, 41630318]
- Chinese Universities Scientific Fund for Innovation Plan of China University of Geosciences (Wuhan) [CUGCJ1702]
The effects of typical sludge properties (solids concentration, soluble extracellular polymeric substances (SEPS) and alkalinity) on waste activated sludge flocculation-dewatering behavior and mechanisms under chemical conditioning with inorganic polymer flocculant-polyaluminum chloride (PACI) were systematically examined in this study. The results indicated that increasing the solids concentration was conductive to sludge dewatering and could greatly decrease the PACI demand in chemical conditioning. Solids concentration had important effects on properties of sludge floc flocculated with PACT, floc structure was more compact and of low EPS concentration at high solids concentrations. High levels of SEPS were adverse to sludge dewaterability after flocculation with PACI, since the SEPS could interact with hydroxy-aluminium through complexation and increase the demand of coagulants. In addition, advantageous speciations of hydroxy-aluminium were rapidly converted into amorphous hydroxides with low flocculation activity at high alkalinity, so the sludge conditioning efficiency was greatly declined. At the same time, the dominant mechanism of chemical conditioning was changed from charge neutralization to sweep coagulation. Finally, this study provides control strategies at complex sludge properties for improving the effectiveness of PACT as a chemical conditioner. (C) 2018. Elsevier Ltd. All rights reserved.
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