电芬顿法去除化学镀镍废水中的镍、总磷和COD  

Removal of nickel,total phosphorus and COD from electroless nickel plating wastewater by electro-Fenton method

作　　者：张峰 詹俊阁 李学伟 乔梦[2] 冒冉 王华 赵旭[2] ZHANG Feng;ZHAN Junge;LI Xuewei;QIAO Meng;MAO Ran;WANG Hua;ZHAO Xu(College of Fisheries and Life Science,Dalian Ocean University,Dalian 116023,China;State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)

机构地区：[1]大连海洋大学水产与生命学院,大连116023 [2]中国科学院生态环境研究中心,环境水质学国家重点实验室,北京100085

出　　处：《环境工程学报》2020年第9期2428-2435,共8页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07602-004);贵州省科技厅项目(黔科合J字[2013]2295号);贵州省科技计划项目(黔科合J字[2013]2295号)。

摘　　要：采用电芬顿法处理化学镀镍废水,分别考察了电流密度、初始pH和H2O2投加量对镍离子、总磷和COD去除效果的影响。结果表明:随着电流密度的增大,镍离子和COD的去除率提高,总磷去除率也逐渐增加;当初始pH为3时,对镍离子、COD和总磷的去除效果最好;随着H2O2投加量的增加,镍离子去除率并没有明显的提高,总磷和COD的去除率表现为先增大后减小。优化所得的最佳工艺参数:电流密度为10 mA·cm^−2、初始pH为3、30%H2O2投加量为6 mL·L^−1、反应40 min,镍离子、总磷和COD的去除率分别达到96.6%、91.5%和84.7%。此外,随着电化学反应的进行,反应体系不断升高的pH导致生成的正磷酸盐沉淀溶出,总磷去除率降低。镍离子主要是通过电絮凝作用去除,总磷和COD主要通过芬顿氧化后吸附沉淀而被去除。以上研究证明,采用电芬顿方法处理化学镀镍废水具有较好的应用前景。Electro-Fenton method was used to treat electroless plating nickel wastewater.The effects of current density,initial pH and dose of hydrogen peroxide(H2O2)on the removal of nickel ions,total phosphorus and COD were studied.The results showed that with the increase of current density,the removal rates of nickel ions and COD increased,and the removal rate of total phosphorus gradually increased.At initial pH of 3,the best removal effects of nickel ions,total phosphorus and COD occurred.With the increase of the dose of hydrogen peroxide,the removal rate of nickel ions did not significantly increase,and the removal rates of total phosphorus and COD first increased and then decreased.The optimal process parameters were following:the current density of 10 mA·cm^−2,initial pH 3,H2O2(30%)dose of 6 mL·L^−1 and the reaction time of 40 min,at which the removal rates of nickel ions,total phosphorus and COD reached 96.6%,91.5%and 84.7%,respectively.With the progress of the electro-Fenton reaction,the continuous increase of the reaction system pH led to the dissolution of the orthophosphate precipitate,the decrease of the removal rate of total phosphorus.The removal of nickel ions was mainly attributed to electric flocculation reaction,while the removal of total phosphorus and COD were mainly attributed to Fenton oxidation,adsorption and precipitation.The above research proves that the electroFenton method has good application prospects in the treatment of electroless nickel plating wastewater.

关 键 词：化学镀镍废水 芬顿氧化 除磷 镍离子 

分 类 号：X703[环境科学与工程—环境工程]