电絮凝处理酸性矿山废水及响应面优化  

Treatment of Acid Mine Draine by Electrocoagulation and Response Surface Optimization

作　　者：王铎 董佳甜 吴权佳 李向东[1] WANG Duo;DONG Jiatian;WU Quanjia;LI Xiangdong(School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116

出　　处：《有色金属（冶炼部分）》2023年第12期69-77,共9页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家重点研发计划项目(2019YFC1805003)。

摘　　要：通过铁和铝电极材料的对比,选择铝极板作为电极材料,研究极板间距、电流密度、反应时间及废水pH对电絮凝法处理酸性矿山废水的影响。结果表明,当废水中Fe^(2)+、Cu^(2+)和Zn^(2+)的初始质量浓度分别为295.1、18.3、8.2 mg L时,极板间距10 mm、电流密度20 mA cm 2、废水pH=5.0的条件下,反应40 min后,Fe^(2)+、Cu^(2+)和Zn^(2+)的去除效率分别达到了90.8%、96.5%和96.8%,反应后废水的pH可达到6.7。在单因素试验的基础上,以电絮凝中Fe^(2)+、Cu^(2+)和Zn^(2+)的去除率的最大值,以及出水pH最大值为评价指标,通过响应曲面法建立模型分析拟合得出优化条件并重复3次试验加以验证。结果表明,在电流密度21 mA cm^(2)、反应时间35 min、极板间距10 mm时,对Fe^(2)+、Cu^(2+)和Zn^(2+)的平均去除率分别为87.02%、93.91%和94.63%,平均pH为6.13,该模型能够较好预测电絮凝对酸性矿山废水的处理效果。絮凝体SEM-EDS检测分析证明Fe、Cu、Zn等重金属可有效从废水中去除。Through the comparison of iron and aluminum electrode materials,aluminum pole plate was selected as the electrode material to study the effects of pole plate spacing,current density,reaction time,and wastewater pH value on the treatment of acidic mine draine by electroflocculation.The results show that when the initial mass concentration of Fe^(2)+,Cu^(2+)and Zn^(2+)in wastewater is 295.1,18.3 and 8.2 mg L,respectively,electrode spacing is 10 mm,current density is 20 mA cm 2,and pH value of wastewater is 5.0,and reaction time is 40 min,the removal efficiency of Fe^(2)+,Cu^(2+)and Zn^(2+)+is 90.8%,96.5%and 96.8%,respectively,and the pH value of wastewater after reaction is 6.7.On the basis of single-factor experiment,the maximum values of the removal rate of Fe^(2)+,Cu^(2+)and Zn^(2+)in electroflocculation and the maximum pH value of the effluent were taken as the evaluation indexes,and the optimization conditions were analytically fitted through the model established by the response surface method and verified by repeating the experiments for three times.The results show that the average removal rate of Fe^(2)+,Cu^(2+)and Zn^(2+)is 87.02%,93.91%and 94.63%,respectively,and average pH value is 6.13 under the conditions including current density of 21 mA cm 2,reaction time of 35 min,plate spacing of 10 mm.The model can predict the effect of electroflocculation on acid mine wastewater treatment.The SEM-EDS test analysis of flocculating constituent shows that heavy metals such as Fe,Cu,Zn can be effectively removed from wastewater.

关 键 词：电絮凝 酸性矿山废水 响应曲面法 

分 类 号：X52[环境科学与工程—环境工程]