摘要
电镀废水的处理问题尤其是重金属的去除问题备受关注。电絮凝对含铬镍电镀废水的处理有很好的效果,实验表明:随p H值的增大,镍的去除率在p H值大于4以后稳定在90%以上,而铬的去除率则在p H4-8时保持在80%以上,当初始p H大于8时,铬的去除率会明显下降到58%;随电流密度的增大,金属离子的去除率会增大。在电流密度为4A/dm2时,铬和镍的最大去除率可以达到90%以上。但是初始浓度越高,电絮凝对该污染物的去除效果越差,相对来说,去除铬比镍所需的电解时间更长。
Experiments are conducted to verify the feasibility of electrocoagulation for treating electroplating wastewater con- taining chromium and nickel. The results indicate that Cr and Ni could be removed perfectly at pH of 4-8. Removal rates of the two heavy metals would be improved along with the increasing of current density. In comparison, it is more difficult to remove Cr by electrocoagulation because that Ni could be removed to acceptable level in 10min under the current density of 4A/dm2, while duration for removing Cr should be expended to 30min. Moreover, the higher initial concentration of the two heavy metals caused worse purification efficiency and higher charge loading.
出处
《清远职业技术学院学报》
2015年第6期63-65,共3页
Journal of Qingyuan Polytechnic
关键词
电镀废水
铬
镍
电凝
Electroplating wastewater
Chromium
Nickel
Electrocoagulation
