Comparative study on the extraction efficiency and economic performance by different agents in the extraction process of heavy metals in sewage sludge

doi:10.16085/j.issn.1000-6613.2015.11.041

Chemical Industry and Engineering Progree ›› 2015, Vol. 34 ›› Issue (11): 4079-4083,4088.DOI: 10.16085/j.issn.1000-6613.2015.11.041

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Comparative study on the extraction efficiency and economic performance by different agents in the extraction process of heavy metals in sewage sludge

WANG Shuo^1,2, YANG Qianqian¹, ZHAO Qingliang³, LI Ji^1,2

1 School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China;
2 Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China;
3 State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China

Received:2015-05-12 Revised:2015-06-27 Online:2015-11-05 Published:2015-11-05

污泥重金属提取剂浸提效率及经济性比较

王硕^1,2, 杨倩倩¹, 赵庆良³, 李激^1,2

1 江南大学环境与土木工程学院, 江苏无锡 214122;
2 江苏省厌氧生物技术重点实验室, 江苏无锡 214122;
3 哈尔滨工业大学城市水资源与水环境国家重点实验室, 黑龙江哈尔滨 150090

通讯作者: 赵庆良,博士,教授,主要从事污泥资源化处理技术研究。E-mailqlzhao@hit.edu.cn。
作者简介:王硕(1984—),男,博士,副教授,主要从事污泥处理处置研究。E-mailshuowang@jiangnan.edu.cn。
基金资助:
国家水体污染控制与治理科技重大专项(2013ZX07315- 003)及江苏省政策引导类计划(产学研合作)前瞻性联合研究项目(BY2015019-27)

Abstract

Abstract: The potential risk of heavy metals in sewage sludge will seriously influence sludge treatment and disposal process, therefore, the extraction of heavy metal by different agents was investigated, and the extraction rate and economical extractable index (EEI) were then studied. The results showed that the extraction efficiency of heavy metal would decrease with the increase of pH of inorganic acid. H⁺ concentration is a significant factor during the extraction process. The extraction rate of heavy metal advanced when the concentrations of low molecular weight (LMW) organic acids rose. Zn was favorable to be extracted than Cr and Cu. In addition, the extraction efficiency of oxalic acid is better than that of citric acid. However, Zn and Cu were preferentially to be extracted than Cr in the extraction process by high molecular weight (HMW) organic acids. There is a positive correlation between the extraction efficiency and HMW organic acid concentrations. Organic acids were suitable in the heavy metal extraction. Furthermore, citric acid and oxalic acid have good performances in Zn extraction while citric acid and EDTA should be utilized in priority in Cr and Cu extraction, respectively.

Key words: sewage sludge, heavy metal, extraction agents, effective state, economical extractable index (EEI)

摘要： 污泥中重金属的潜在危害严重影响其处理处置效果,因此本文研究了各种提取剂对污泥重金属的浸提效果,并依据经济可提取指数与浸提效果进行了经济性分析。结果表明,无机酸提取剂对污泥重金属的浸提效果随其pH值升高而降低,H⁺浓度是影响其浸提率的主要因素。低分子量有机酸提取剂对污泥中重金属的浸提效率随其浓度增加而增大,其对3种重金属的提取效率顺序为Zn> Cr> Cu。Zn是最易被提取的重金属,草酸对污泥重金属的浸提效果优于柠檬酸。污泥重金属浸提率与高分子量有机酸提取剂浓度呈正相关,其对3种重金属的提取效率顺序为Zn> Cu> Cr。污泥重金属的浸提一般应优先选用有机酸提取剂,对污泥重金属Zn的提取宜选用柠檬酸和草酸,对污泥重金属Cr和Cu的提取一般应选用柠檬酸和乙二胺四乙酸。

关键词: 污泥, 重金属, 提取剂, 有效态, 经济可提取指数

CLC Number:

TU991

WANG Shuo, YANG Qianqian, ZHAO Qingliang, LI Ji. Comparative study on the extraction efficiency and economic performance by different agents in the extraction process of heavy metals in sewage sludge[J]. Chemical Industry and Engineering Progree, 2015, 34(11): 4079-4083,4088.

王硕, 杨倩倩, 赵庆良, 李激. 污泥重金属提取剂浸提效率及经济性比较[J]. 化工进展, 2015, 34(11): 4079-4083,4088.

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Comparative study on the extraction efficiency and economic performance by different agents in the extraction process of heavy metals in sewage sludge

污泥重金属提取剂浸提效率及经济性比较

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