电絮凝法处理电镀废水中Cr^(n+)、Cu^(2+)、Zn^(2+)的试验  

Experimental study for treating electroplating wastewater containing Cr^(n+),Cu^(2+) and Zn^(2+) by electrocoagulation

作　　者：储金宇[1] 史兴梅[1] 杜彦生[1] 马放 

机构地区：[1]江苏大学环境学院,江苏镇江212013 [2]城市水资源与水环境国家重点实验室,黑龙江哈尔滨150000

出　　处：《江苏大学学报（自然科学版）》2011年第1期103-106,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏高校科研成果产业化推进项目(JH07-025)

摘　　要：针对电镀废水对生态环境的严重污染问题,提出了铝板作为极板的电絮凝设备处理电镀废水中的重金属离子Crn+、Cu2+、Zn2+,研究了初始pH值、电流密度、电极间距等因素对处理效果的影响.试验结果表明,在电絮凝过程中,初始pH值在4～8之间时,金属离子的去除率最好,但当初始pH值超过8时,铬的去除率有所下降;并且随着电流密度、电解时间的增加,金属离子的去除率不断增加;电极间距的减小,使得重金属离子取得较好的去除效果.在初始pH为6,电流密度5.45A/dm2,电极间距为1 cm,通电时间为30 min的工艺条件下,电镀度水中Crn+去除率为96.22%,Cu2+去除率为99.86%,Zn2+去除率为99.13%.To control the pollution status of environment by electroplating wastewater,electro-coagulation technology was applied to treat electroplating wastewater containing heavy metal ions.Meanwhile,the relationship between the heavy metal removal rate and some affection factors,such as initial pH value,current density,electrode span were analyzed.The results show that the removal efficiency was most effective when the pH was kept between 4 and 8.When the initial pH exceeded 8,the removal efficiency of chromium ion declined.With current density and time increasing,the removal efficiency of metal ion increased gradually.When the initial pH value was 6,the current density was 5.45 A/dm2,the distance between the electrode plates was 1 cm,and the time of the electrolytic treatment was 30 min,the removal efficiency of Crn＋,Cu2＋ and Zn2＋ were 96.22%,99.86%,99.13% respectively.

关 键 词：电镀废水 电絮凝 重金属 影响因素 去除率 

分 类 号：X523[环境科学与工程—环境工程]