Cr speciation and hazardous waste identification in tannery sludge

doi:10.16085/j.issn.1000-6613.2017.04.042

Abstract

Abstract: To reveal the correlational relationship between tannery sludge hazardous waste identification and the ecological risk and speciation of Cr,this paper investigated component analysis and the leaching toxicity and speciation of Cr in tannery sludge,and removal of Cr from tannery sludge by hydrochloric acid was also performed. Results showed that tannery sludge is a typical industrial solid waste with a great amount of organic matter and inorganic salts,as well as a variety of metallic elements in dominated by Ca,Fe,Cr,Al and Cr which is of the highest harm to the environment. The acidly soluble and organic matter bonding fractions are the main speciation of Cr in tannery sludge,while the bioavailability of Cr only accounted for a smaller proportion in amount,nevertheless its mobility under acidic condition still may result in a high ecological risk. In this study,the leaching concentration of Cr was lower than 0.25mg/L,showing no leaching toxicity,but the environmental behavior of Cr still makes it hazardous waste. The extraction efficiency of Cr was up to 81.7% by hydrochloric acid and acceptable for reutilization,indicating hydrochloric acid was suitable for Cr extraction in tannery sludge.

Key words: tannery sludge, chromium, speciation characteristic, hazardous waste, leaching toxicity

摘要： 通过对制革污泥的物质组成和Cr的浸出毒性及其赋存形态的研究，揭示了制革污泥危险废物识别与Cr生态风险及其赋存形态间的相关关系，同时考察了盐酸对制革污泥中Cr的浸提。结果表明制革污泥是一种富含有机质和无机盐的工业污泥，同时含多种金属元素，其中Ca、Fe、Cr和Al含量最多，但尤以Cr对环境的危害最大。制革污泥中Cr绝大部分以酸溶态和有机结合态形式存在，有效态Cr含量占全量比重较小，但酸性污泥中Cr的迁移能力使其处于高生态危害风险。制革污泥中Cr的浸出浓度低于0.25mg/L，尽管不具备浸出毒性特征，但Cr的环境行为使其仍属于危险废物。盐酸对制革污泥中Cr的浸出效率最高为81.7%，可以作为浸提剂用于制革污泥脱铬，剩余污泥可以达到综合利用标准。

关键词: 制革污泥, 铬, 形态分析, 危险废物, 浸出毒性

CLC Number:

X794

ZHOU Jianjun, MA Hongrui, ZHU Chao, WU Wei, CAO Ling, SUN Wenyue. Cr speciation and hazardous waste identification in tannery sludge[J]. Chemical Industry and Engineering Progress, 2017, 36(04): 1476-1481.

周建军, 马宏瑞, 朱超, 吴薇, 曹玲, 孙文岳. 制革污泥铬的形态与危险废物识别方法[J]. 化工进展, 2017, 36(04): 1476-1481.

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