铁-碳微电解/改进硫化钠沉淀法处理综合电镀废水  

Treatment of comprehensive electroplating wastewaterby Iron-carbon micro-electrolysis-Sodium sulfide precipitation

作　　者：刘霄 刘定富[2] Liu Xiao;Liu Dingfu(Guizhou Research and Design Institute of Environmental Science,Guiyang 550081;Guizhou University,Guiyang 550025)

机构地区：[1]贵州省环境科学研究设计院,贵阳550081 [2]贵州大学,贵阳550025

出　　处：《环保科技》2021年第6期15-17,32,共4页Environmental Protection and Technology

摘　　要：综合电镀废水中含有多种有害的重金属离子,其有效处理是备受关注的问题之一。本文采用铁-碳微电解/改进硫化钠沉淀法处理综合电镀废水,研究Fe/C摩尔比、Na_(2)S投加量以及废水最终pH对残余重金属离子含量的影响。结果表明,当Fe/C摩尔比为1:1.14,Na_(2)S投加量为0.29 g/L,最终pH为7.0时,在常温下反应15 min后静置,上清液中残余Cd^(2+)、Zn^(2+)、Ni^(2+)、Cu^(2+)的质量浓度都大幅降低,各种重金属离子的去除率分别为Cd^(2+)90.3%、Zn^(2+)84.2%、Ni^(2+)94.3%和Cu^(2+)96.0%,铁-碳微电解/改进硫化钠沉淀法可有效去除综合电镀废水中的Cd^(2+)、Zn^(2+)、Ni^(2+)、Cu^(2+)等重金属离子。Comprehensive electroplating wastewater contains a variety of heavy metal ions harmful to the environment.How to deal with it effectively is one of the hot spots in the electroplating industry.The integrated electroplating wastewater was treated by Iron-carbon micro-electrolysis-sodium sulfide precipitation method,and the effects of Fe/C molar ratio,Na_(2)S dosage,final pH of wastewater and reaction temperature and time on residual heavy metal ion concentration were studied.The results showed that when the molar ratio of Fe/C was 1:1.14,the dosage of Na_(2)S was 0.29g/L,and the final pH was 7.0,the reaction went on at 20℃ for 15 min and then stood a while,the concentration of residual Cd^(2+),Zn^(2+),Ni^(2+)and Cu^(2+)in the supernatant was greatly reduced.The removal rates of various heavy metal ions were Cd^(2+)90.3%,Zn^(2+)84.2%,Ni^(2+)94.3%and Cu^(2+)96.0%,respectively.The iron-carbon micro-electrolysis-sodium sulfide precipitation method can effectively remove heavy metal ions such as Cd^(2+),Zn^(2+),Ni^(2+)and Cu^(2+)in the integrated electroplating wastewater.

关 键 词：重金属离子 铁-碳微电解 化学沉淀 

分 类 号：X703[环境科学与工程—环境工程]