Extracting heavy metals from municipal and industrial sludges
Extracting heavy metals from municipal and industrial sludges
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从城市和工业污泥中提取重金属
DOI：
10.1016/0048-9697(90)90189-2
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发表时间：
1990
影响因子：
9.8
通讯作者：
Y. Chen
中科院分区：
文献类型：
--
作者：
Kai;Y. Chen
本研究采用酸度、乙二胺四乙酸（EDTA）和氨三乙酸（NTA）处理工艺，探讨城市和工业污泥中重金属的去除效果。结果表明，污泥中重金属的最佳萃取处理效果与污泥中重金属的种类、萃取剂的投加量和反应时间有关。三级逆流工艺的去除效率高于单级逆流工艺。反应动力学可以用方程dC/dt=-KC表示。在重金属浓度高的条件下，每单位重量的重金属提取的酸处理过程的成本是最低的，但在重金属浓度低的情况下，EDTA过程是最便宜的。
This study used acidity, ethylenediaminetetracetic (EDTA) and nitrilotriacetic (NTA) acids treatment processes to explore the removal efficiencies of heavy metals from urban and industrial sludges. The results indicate that the optimum treatment efficiencies of heavy metals extraction from sludge are related to the species of heavy metals in sludge, dosage of extractants and the reaction time. The removal efficiency of a three-stage countercurrent process was higher than those of single-stage processes. The reaction kinetics can be expressed by the equation dC/dt= −KC. The cost of the acid treatment process per unit weight of heavy metal extracted was lowest in conditions of high heavy metal concentrations, but the EDTA process was the cheapest with low heavy metal concentrations.