鼓氮电沉积法处理含铜废水的试验研究  

Experimental study on the treatment of sewage with copper content with nitrogen-blowing electro-deposition

作　　者：陈熙[1] 徐新阳[1] 任海燕[1] 邢家良 

机构地区：[1]东北大学资源与土木工程学院,沈阳110819

出　　处：《安全与环境学报》2014年第6期139-142,共4页Journal of Safety and Environment

基　　金：国家科技支撑计划项目(2011BAE03B01)

摘　　要：为净化废水和回收金属铜,采用电沉积法对含铜废水进行处理。在研究极板材料、槽电压、极板间距、pH值等试验条件的基础上,对照研究鼓入氮气对沉积效果的影响。结果表明,在鼓入氮气的条件下,当采用石墨-铝板电极、槽电压7 V、极板间距15 mm、pH值3.5时可以保证较好的去除效果和电流效率,铜离子去除率可以达到93%,平均电流效率可以达到50%。鼓入氮气可以有效降低水中溶解氧的质量浓度,从而降低了沉积金属的腐蚀率,并有效削弱沉积过程中出现的浓差极化,提高金属的电沉积效率和电流效率。The present paper is concerned about an improved sewage- treating method for copper content removing through nitrogen-blowing electro-deposition, which has become a recent tendency of heavy metal containing sewage treatment. As is known, in China, large amounts of copper containing sewage has to be discharged annually from the copper and other related industrial plants, such as those in producing smelting, electroplating and circuit boards. Therefore, this paper would like to make an exploration of the efficiency and the influential factors of the electro-deposition method on treating and retrieving copper from the said sewage. For our research purpose, we have adopted the atomic absorption spectrophotometfic method under constant voltage to determine the copper ion concentration. It is also this purpose, we have done the electro-deposition experiments with the nitrogen blowing beyond the normal experimental conditions to find the effects of the electrode materials, Cell voltages, the plate dis- tance and the pH value on the electro-deposition process with and/or without blowing nitrogen. A comparison of the experiment results has made us clear that the optimal conditions under the blowing nitrogen should be graphite-aluminum electrode used with the cell voltage of 7 V, the plate distance being 15 mm and the value of pH of 3.5. Under the optimal conditions, it is possible for the removal rate of copper to reach beyond 93 % and the average current efficiency high up to 50% . Moreover, it would be possible to increase the current effi- ciency by 20% and the copper recovery rate by 12% with nitrogen stripping. Therefore, nitrogen-stripping is in a position to improve the efficiency of the experiment remarkably for the gas oxygen to be gen- erated near the anode from the electrolysis of water in the process of electro-deposition, and the metallic copper to be reacted and deposited on the cathode, which can also induces the deposited copper dissolution repeatedly. What is more, nitrogen stripping can also promote the

关 键 词：环境工程学 电沉积 浓差极化 电流效率 

分 类 号：X172[环境科学与工程—环境科学]