Ca^(2+)强化沉淀处理含铜电镀废水并回收铜研究  

Study on Ca^(2+)-Enhanced Precipitation for Copper Removal and Recovery from Electroplating Wastewater

作　　者：张智远 蒋树贤[1] 李嘉毅 李宇峰 张博雯 李绍秀[1] ZHANG Zhiyuan;JIANG Shuxian;LI Jiayi;LI Yufeng;ZHANG Bowen;LI Shaoxiu(School of Civil and Transportation Engineering,Guangdong University of Technology,510006;International Department,The Affiliated High School of SCNU,510630: Guangzhou,China)

机构地区：[1]广东工业大学土木与交通工程学院,510006 [2]华南师范大学附属中学国际部,广东广州510630

出　　处：《水处理技术》2019年第5期34-37,共4页Technology of Water Treatment

基　　金：广东省自然科学基金项目(S201204003754;2017A030313321)

摘　　要：针对氢氧化物沉淀工艺不能去除络合态重金属的问题,采用加钙离子强化氢氧化物沉淀的方法处理含铜电镀废水并回收铜实验。结果表明,钙离子的加入能够有效提高氢氧化物对络合态重金属废水的处理效果。当pH> 10,反应时间为15 min,除铜效果为佳,铜去除率可达99%以上。与现有铁氧体法相比,钙强化氢氧化物沉淀法投药量大大减少,工艺稳定性也大大增加。把沉泥加入pH<5的酸液中,铜离子可实现循环利用,为保证重金属回收率,其反应时间应大于30 min。该方法具有工艺简单、成本低廉、效果明显和易于管理的特点。Aiming to solve the low efficiency of hydroxide precipitation for chelated metals removal, Ca2+-enhanced hydroxide precipitation method was used for electroplating wastewater treatment and copper recovery. The results showed that, the removal efficiency of chelated metals could be effectively promoted by the addition of Ca2+. When pH was large than 10 and the reaction time was above 15 min, copper removal efficiency was the best and the copper removal rate could each over 99%. Compared with the present ferrite process, Ca2+-enhanced hydroxide precipitation process has the advantages of low dosage and strong technical stability. By acid dissolution of the resulted sludge, copper could be effectively recovered as pH was less than 5 and reaction time was above 30 min. The new process has the characteristics of simple process, low cost, obvious effect and easy management.

关 键 词：强化沉淀 络合铜废水 氢氧化物沉淀法 铜回收 

分 类 号：X781.1[环境科学与工程—环境工程]