| 引用本文: | 魏亮亮,王胜,薛茂,赵庆良.城镇污泥胞外聚合物对重金属吸附特征及机制[J].哈尔滨工业大学学报,2018,50(8):188.DOI:10.11918/j.issn.0367-6234.201803156 |
| WEI Liangliang,WANG Sheng,XUE Mao,ZHAO Qingliang.Study on adsorption of heavy metals onto sludge extracellular polymers substances (EPS): A review[J].Journal of Harbin Institute of Technology,2018,50(8):188.DOI:10.11918/j.issn.0367-6234.201803156 |
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| 摘要: |
| 中国城镇污水处理行业重水轻泥现象严重，致使大量市政污泥积聚并亟待处理处置.在污泥处理处置过程中，重金属不断富集，其广泛存在严重制约了污泥最终的土地利用，因此，重金属在污泥中的吸附特征及存在形式受到广泛关注.胞外聚合物(EPS)作为污泥有机物的主要成分，主要由蛋白质、腐殖酸和多糖类物质等构成，具有多孔聚合结构，含有大量以羰基、羧基、羟基等官能团为代表的潜在吸附位点，能够有效吸附重金属离子，其物化特性对污泥中重金属含量及分布特征影响巨大.本文首先介绍中国市政污泥处理现状以及典型城镇污泥中EPS的化学组成、物理特性和结构特征，并对可能含有的吸附位点进行分析总结；在此基础上，重点概括近年来污泥重金属在EPS上吸附的研究进展，对EPS吸附重金属研究中常见的表征手段进行总结；最后，针对性地提出未来EPS吸附重金属研究方向的建议.
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| 关键词: 污泥 胞外聚合物 重金属 吸附 化学结构 |
| DOI：10.11918/j.issn.0367-6234.201803156 |
| 分类号:X703 |
| 文献标识码:A |
| 基金项目:中国工程科技中长期发展战略研究领域战略研究项目(YXQQ2440600218)；城市水资源与水环境国家重点实验室开放基金(QA201718) |
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| Study on adsorption of heavy metals onto sludge extracellular polymers substances (EPS): A review |
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WEI Liangliang1,WANG Sheng1,XUE Mao1,ZHAO Qingliang1,2
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(1.School of Environment, Harbin Institute of Technology, Harbin 150090, China; 2.State Key Laboratory of Urban Water Resource and Environment(Harbin Institute of Technology), Harbin 150090, China)
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| Abstract: |
| Less attention devoting to the disposal of sewage sludge in China in the past decades led to unproper treatment of huge quantity of sewage sludge, which caused serious environmental problems. Since tremendous distribution of the enriched heavy metals in sewage sludge restricted its final land disposal, thus how those heavy metals are adsorbed onto the sludge has been highly concerned. Extracellular polymeric substances (EPS), mainly composed of protein, humic acid, polysaccharides, etc., is the main components of sludge organics. EPS traditionally exhibites a porous polymeric structure, and those polarity heavy metals can be easily adsorbed onto the adsorption sites (such as carboxyl and hydroxyl groups) which existes on the surface of EPS. Overall, the physicochemical structural characteristics of EPS significantly affects the adsorbing processes of heavy metals. In this study, we firstly gave a brief introduction to the current status of sludge treatment and disposal in China. Then, effect of the compositions and structures of sludge EPS on heavy metals adsorption was analyzed and the potential adsorption sites were summarized. Moreover, the analyzing approaches for studying the heavy metals adsorption processes were comparably evaluated. Finally, suggestions on the future research was raised pertinently.
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| Key words: sludge extracellular polymeric substances heavy metals adsorption physicochemical characteristics |
