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Characterization of changes in extracellular polymeric substances and heavy metal speciation of waste activated sludge during typical oxidation solubilization processes
Xu, Qiongying; Wang, Huidi; Wang, Qiandi; Zhang, Weijun; Wang, Dongsheng
2019-06
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES
ISSN1001-0742
Volume80Pages:146-158
AbstractBiopolymer solubilization is considered to be the rate-limiting stage of anaerobic digestion of waste activated sludge (WAS). Oxidation processes have been proven to be effective in disrupting sludge flocs and causing solubilization of the solid biopolymers. In this study, WAS was treated by NaNO2 or H2O2 oxidation at pH of 2. The changes in extracellular polymeric substances properties and the speciation of heavy metals were investigated. The results revealed that both NaNO2 and H2O2 treatments were effective in solubilizing organics in WAS, while the conversion of biopolymers in the two treatment processes was different. Free nitrous acid destroyed the gel network structure of EPS, and organic materials were released from the solid phase to the supernatant. Indigenous peroxidase catalyzed H2O2 to produce hydroxyl radicals which caused significant solubilization of biopolymers, and the protein-like substances were further degraded into micro-molecule polypeptides or amino acids at high dosages of H2O2. During the oxidation processes, Zn, Cd and Cu, with excellent mobility, tended to migrate to the supernatant, and thus were easy to remove through the liquid-solid separation process. Ni and As showed moderate migration ability, of which the residual fraction tended to transform into reducible and soluble fractions. With poor mobility, Cr and Pb mainly existed in the forms of residual and oxidizable fractions, which were difficult to dissolve and remove from WAS. Both NaNO2 and H2O2 treatment resulted in the enhancement of sludge solubilization efficiency and heavy metal mobility in WAS, but different heavy metals showed distinct migration and transformation behaviors. (C) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
Department环境水质学国家重点实验室
KeywordExtracellular polymeric substances (EPS) Oxidation Biopolymers solubilization Biodegradability Heavy metals
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43070
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, Beijing 100085, Peoples R China
Recommended Citation
GB/T 7714
Xu, Qiongying,Wang, Huidi,Wang, Qiandi,et al. Characterization of changes in extracellular polymeric substances and heavy metal speciation of waste activated sludge during typical oxidation solubilization processes[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2019,80:146-158.
APA Xu, Qiongying,Wang, Huidi,Wang, Qiandi,Zhang, Weijun,&Wang, Dongsheng.(2019).Characterization of changes in extracellular polymeric substances and heavy metal speciation of waste activated sludge during typical oxidation solubilization processes.JOURNAL OF ENVIRONMENTAL SCIENCES,80,146-158.
MLA Xu, Qiongying,et al."Characterization of changes in extracellular polymeric substances and heavy metal speciation of waste activated sludge during typical oxidation solubilization processes".JOURNAL OF ENVIRONMENTAL SCIENCES 80(2019):146-158.
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