Characterization of changes in extracellular polymeric substances and heavy metal speciation of waste activated sludge during typical oxidation solubilization processes
文献类型：期刊论文
| 作者 | Xu, Qiongying; Wang, Huidi; Wang, Qiandi; Zhang, Weijun; Wang, Dongsheng |
| 刊名 | JOURNAL OF ENVIRONMENTAL SCIENCES
 |
| 出版日期 | 2019-06 |
| 卷号 | 80页码:146-158 |
| 关键词 | Extracellular polymeric substances (EPS) Oxidation Biopolymers solubilization Biodegradability Heavy metals |
| ISSN号 | 1001-0742 |
| 英文摘要 | Biopolymer 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. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/43070]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 作者单位 | 1.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Hubei, Peoples R China 2.China Univ Geosci, Fac Mat Sci & Chem, Wuhan 430074, Hubei, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China 4.Hubei Prov Engn Res Ctr Systemat Water Pollut Con, Wuhan 430074, Hubei, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：生态环境研究中心
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