铬污染建筑废物不同清洗剂的作用效果比较

doi:10.3969/j.issn.0438-1157.2012.10.035

化工学报 ›› 2012, Vol. 63 ›› Issue (10): 3255-3261.DOI: 10.3969/j.issn.0438-1157.2012.10.035

铬污染建筑废物不同清洗剂的作用效果比较

王兴润¹, 张艳霞^1,2, 王琪¹, 舒俭民¹

1. 中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012;
2. 西北农林科技大学理学院, 陕西杨凌 712100

收稿日期:2011-11-25 修回日期:2012-07-02 出版日期:2012-10-05 发布日期:2012-10-05
通讯作者: 王兴润
作者简介:王兴润(1981- ),男,博士,副研究员。
基金资助:
国家高技术研究发展计划项目(2009AA063101-2)。

Comparison of different washing agents for disposal of chromium-contaminated construction waste

WANG Xingrun¹, ZHANG Yanxia^1,2, WANG Qi¹, SHU Jianmin¹

1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
2. College of Science, Northwest A & F University, Yangling 712100, Shaanxi, China

Received:2011-11-25 Revised:2012-07-02 Online:2012-10-05 Published:2012-10-05
Supported by:
supported by the High-tech Research and Development Program of China(2009AA063101-2).

摘要/Abstract

摘要： 以海北化工厂的铬污染建筑废物为研究对象,采用改良的BCR顺序提取法研究了不同洗涤药剂对水洗一次后的建筑废物样品总Cr和Cr⁶⁺的清洗效果,分析了6种洗涤药剂对各形态铬的去除效果,并最终筛选出最佳的清洗剂。结果表明:柠檬酸和高浓度盐酸对总Cr和Cr⁶⁺去除率最高,总铬达到90%以上,Cr⁶⁺达到99%以上;高浓度柠檬酸、高浓度盐酸和高浓度醋酸降低了建筑废物的pH值,在酸性条件下Cr⁶⁺被有机酸自发地还原成Cr³⁺,导致Cr⁶⁺具有很好的去除效果;6种洗涤剂均对酸可提取态铬有很好的去除;由于络合作用,柠檬酸对可氧化态存在的Cr³⁺的去除效果很好。综上,柠檬酸是较合适的建筑废物二次洗涤药剂。

关键词: 铬污染建筑废物, 洗涤剂, 柠檬酸, 连续提取法

Abstract: The chromium-contaminated construction wastes of the Haibei Chemical Plant were selected as test sample.The removal efficiencies of the total Cr and Cr⁶⁺ of six different washing agents were investigated to find a suitable washing agent by using the modified BCR method.The removal mechanisms of various forms of chromium by six kinds of washing agents were studied.The total Cr and Cr⁶⁺ removal rates were very high for citric acid and concentrated hydrochloric acid,more than 90% of total Cr,more than 99% of Cr⁶⁺. Concentrated citric acid,concentrated hydrochloric acid and concentrated acetic acid reduced the pH value of the construction waste,and in acidic conditions Cr⁶⁺ was reduced to Cr³⁺ by organic matter.Six kinds of washing agents were very efficient for acid extractable chromium removal.Due to complexation,citric acid was very good for oxidized state chromium removal.Citric acid was the best washing agent after careful consideration of economic and environmental factors.

Key words: chromium-contaminated construction waste, washing agent, citric acid, modified BCR method

中图分类号:

X705

王兴润, 张艳霞, 王琪, 舒俭民. 铬污染建筑废物不同清洗剂的作用效果比较[J]. 化工学报, 2012, 63(10): 3255-3261.

WANG Xingrun, ZHANG Yanxia, WANG Qi, SHU Jianmin. Comparison of different washing agents for disposal of chromium-contaminated construction waste[J]. CIESC Journal, 2012, 63(10): 3255-3261.

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铬污染建筑废物不同清洗剂的作用效果比较

Comparison of different washing agents for disposal of chromium-contaminated construction waste

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