工业水处理 ›› 2023, Vol. 43 ›› Issue (2): 111-117. doi: 10.19965/j.cnki.iwt.2022-0366

• 试验研究 • 上一篇    下一篇

基于膜吸收法处理实际高浓度蚀刻废液的研究

刘华光1(), 任亚涛1, 赵子龙1,2, 王宏杰1,2,3(), 董文艺1,2,3, 侯惠惠1   

  1. 1.哈尔滨工业大学(深圳)土木与环境工程学院,广东 深圳 518055
    2.深圳市水资源利用与环境污染控制重点实验室,广东 深圳 518055
    3.城市水资源与水环境国家重点实验室,哈尔滨工业大学环境学院,黑龙江 哈尔滨 150090
  • 收稿日期:2022-12-05 出版日期:2023-02-20 发布日期:2023-05-26
  • 通讯作者: 王宏杰 E-mail:1017012145@qq.com;whj1533qihan@163.com
  • 作者简介:刘华光(1993— ),博士研究生。E-mail:1017012145@qq.com
    王宏杰,研究员。E-mail:whj1533qihan@163.com
  • 基金资助:
    深圳市科技计划可持续发展专项(KCXFZ202002011006362)

Treatment of actual high concentration etching solution based on membrane absorption method

Huaguang LIU1(), Yatao REN1, Zilong ZHAO1,2, Hongjie WANG1,2,3(), Wenyi DONG1,2,3, Huihui HOU1   

  1. 1.School of Civil and Environmental Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China
    2.Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control,Shenzhen 518055,China
    3.State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin 150090,China
  • Received:2022-12-05 Online:2023-02-20 Published:2023-05-26
  • Contact: Hongjie WANG E-mail:1017012145@qq.com;whj1533qihan@163.com

摘要:

为实现对印刷线路板生产领域高浓度蚀刻废液的高效处理,建立了“膜吸收+Na2S破络+PAC混凝沉淀”工艺,考察其对实际高氨氮蚀刻废液的脱氨除铜效能,并优化了工艺条件。通过单因素实验探究了料液pH和流速、吸收液浓度和流速、膜组件级数与温度等因素对NH4+-N去除率、传质系数和过膜通量的影响,并确定了最佳运行参数:料液pH=10.5、流速3.6 cm/s,吸收液浓度2.0 mol/L、流速1.1 cm/s,膜组件级数为18级,温度为40 ℃。在该最佳运行条件下,蚀刻废液NH4+-N可由82 000 mg/L降至100 mg/L左右,去除率保持在99.8%以上,膜传质系数为3.38×10-6 m/s,过膜通量为40.7 mg/(m2·s)。同时对Na2S破络及混凝沉淀工艺条件进行了优化,以n(S2-)/n(Cu2+)=1.4投加Na2S对铜氨络合物进行破络,并投加150 mg/L PAC进行混凝沉淀,可将出水铜质量浓度控制在0.5 mg/L以下。重复实验结果表明,膜吸收法长期运行效能稳定,对印刷线路板高氨氮生产废水处理具有很好的适用性,是解决高浓度蚀刻废液污染问题的有效技术途径之一。

关键词: 蚀刻废液, 膜吸收法, 高氨氮, 参数优化

Abstract:

In order to realize the efficient treatment of high-concentration etching waste solution in printed circuit board production field,the process of membrane absorption+Na2S breaking+PAC coagulation and precipitation was established to investigate the ammonia nitrogen and copper removal efficiency of the actual high-ammonia-nitrogen etching waste solution,and the process conditions were optimized. Single factor experiments were designed to explore the influences of pH and flow rate of feed liquid,concentration and flow rate of absorption solution,stages of membrane modules and temperature on NH4+-N removal rate,mass transfer coefficient and membrane flux,and the optimal operating parameters were determined as follow:feed liquid pH=10.5,flow rate of feed liquid was 3.6 cm/s,absorption liquid concentration was 2.0 mol/L,flow rate of absorption liquid was 1.1 cm/s,film stages was 18,temperature was 40 ℃. Under the above conditions,NH4+-N could be reduced from 82 000 mg/L to about 100 mg/L,the removal rate of NH4+-N remained more than 99.8%,the mass transfer coefficient was 3.38×10-6 m/s,and the transmembrane flux was 40.7 mg/(m2·s). At the same time,the process conditions of Na2S breaking and coagulation and precipitation were optimized. Na2S was added to the copper ammonia complex at the condition of n(S2-)/n(Cu2+)=1.4,and 150 mg/L PAC was added to the breaking solution for coagulation and precipitation,the copper concentration in effluent could be controlled below 0.5 mg/L. The results of repeated experiments showed that the membrane absorption method had stable performance in long-term operation,and had good applicability to the treatment of high ammonia nitrogen production wastewater of printed circuit board. It was one of the effective technical approaches to solve the pollution problem of high concentration etching waste solution.

Key words: etching waste solution, membrane absorption method, high NH4+-N, parameter optimization

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