重金属捕集剂对废水中铅捕集效果研究

TREATMENT OF WASTEWATER CONTAINING LEAD WITH HEAVY METAL CHELATING AGENTS

研究了几种重金属捕集剂对含铅废水的处理效果,讨论了反应时间、捕集剂加入量、pH值及多种重金属离子共存条件下各种捕集剂对铅处理效果的影响。实验结果表明,在反应时间为20min,捕集剂加入量为理论用量的1.2倍,pH值为2～6时处理效果较好,捕集效率在99%以上,且多种重金属离子共存条件下对捕集效果没有影响,处理后的废水能达到重金属国家排放标准。因此采用该方法优于传统处理方法,有很好的应用前景。

The objective of the study described in this paper is to evaluate treating capacity of several heavy metal chelating agents for treatment of a simulated wastewater containing lead, and the influence of the time of reaction, the used quantity of chelating agents, pH value, multi heavy metals ions co-existing on the results of treatment were discussed. The results showed that these chelating agents all have high removing efficiency under the following conditions： the time of reaction is about 20 minutes, the used quantity of chelating agents is more than 1.2 times than the theoretic dosage, pH is 2～6, the efficiency of the chelating agents capturing heavy metals ions is above 99%, and the quality of the treated wastewater could reach wastewater discharge standards. Thus the method is superior to the traditional chemical method and has better applying prospect.