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Flocculation-dewatering behavior of waste activated sludge particles under chemical conditioning with inorganic polymer flocculant: Effects of typical sludge properties
Yang, Peng; Li, Dandan; Zhang, Weijun; Wang, Ning; Yang, Zhaoyi; Wang, Dongsheng; Ma, Teng
2019-03
Source PublicationCHEMOSPHERE
ISSN0045-6535
Volume218Pages:930-940
AbstractThe 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.
Department环境水质学国家重点实验室
KeywordAlkalinity Extracellular polymeric substances (EPS) Polyaluminum chloride Solids concentration Sludge dewaterability
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43088
Collection环境水质学国家重点实验室
Affiliation1.China Univ Geosci, Fac Mat Sci & Chem, Wuhan 430074, Hubei, Peoples R China
2.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Hubei, Peoples R China
3.Hubei Prov Engn Res Ctr Systemat Water Pollut Con, Wuhan 430074, Hubei, Peoples R China
4.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, 18 Shuangqing Rd, Beijing 100085, Peoples R China
Recommended Citation
GB/T 7714
Yang, Peng,Li, Dandan,Zhang, Weijun,et al. Flocculation-dewatering behavior of waste activated sludge particles under chemical conditioning with inorganic polymer flocculant: Effects of typical sludge properties[J]. CHEMOSPHERE,2019,218:930-940.
APA Yang, Peng.,Li, Dandan.,Zhang, Weijun.,Wang, Ning.,Yang, Zhaoyi.,...&Ma, Teng.(2019).Flocculation-dewatering behavior of waste activated sludge particles under chemical conditioning with inorganic polymer flocculant: Effects of typical sludge properties.CHEMOSPHERE,218,930-940.
MLA Yang, Peng,et al."Flocculation-dewatering behavior of waste activated sludge particles under chemical conditioning with inorganic polymer flocculant: Effects of typical sludge properties".CHEMOSPHERE 218(2019):930-940.
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