实验室废水中锌离子处理技术研究  

Study on treatment technology of zinc ion in laboratory wastewater

作　　者：李貌 刘梅[1] 夏双双 原佳露 覃小龙 高雯婷 LI Mao;LIU Mei;XIA Shuangshuang;YUAN Jialu;QIN Xiaolong;GAO Wenting(School of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学化学化工学院,四川成都610500

出　　处：《能源环境保护》2021年第2期41-45,共5页Energy Environmental Protection

基　　金：四川省大学生创新创业训练计划项目(S202010615078)。

摘　　要：通过中和沉淀法和吸附法分别处理模拟锌离子废水,考察了碱用量、锌离子初始浓度以及分子筛用量对处理效果的影响,采用红外光谱表征了使用前后的分子筛。并在最佳碱用量和分子筛投加量条件下,采用中和沉淀-吸附法联合处理化学反应焓变测定过程中产生的实验室废水。结果表明:当n(OH-)/n(Zn^(2+))为2时,中和沉淀法处理模拟锌离子废水的效果最好,出水pH为6.8;当Zn^(2+)初始浓度为10~40 mg/L且分子筛投加量为50 g/L时,剩余Zn^(2+)浓度降低为1.0~3.0 mg/L,分子筛质量损失率为0.5%~3.8%;溶液中的Zn^(2+)进入了分子筛内部并形成了新的化学键;中和沉淀-吸附工艺在最优条件下的出水中的Zn^(2+)浓度、Cu2+浓度、pH值分别为2.4mg/L、0.2 mg/L和6.8,满足GB 8978—1996二级排放标准。The neutralization-precipitation method and adsorption method were used separately to treat simulated Zn^(2+)wastewater.The influence of the dosage of alkali,initial concentration of Zn^(2+)and the dosage of molecular sieves on treatment effect was investigated.The FTIR technology was used to characterize the structure of the molecular sieves before and after use.Under the optimum dosage of alkali and molecular sieves,the neutralization-precipitation combined adsorption process was used to treat laboratory wastewater produced during the determination process of the enthalpy of chemical reactions.The results showed that when the ratio of n(OH-)/n(Zn^(2+))was 2,the treating effect of neutralization-precipitation method was optimal and the pH value of effluent was 6.8.When the initial concentration of Zn^(2+)was 10~40 mg/L and the dosage of molecular sieves was 50 g/L,the residual concentration of Zn^(2+)decreased to 1.0~3.0 mg/L,and the mass loss rate of molecular sieves was 0.5%~3.8%.The FTIR analysis illustrated that Zn^(2+)in the solution entered into the molecular sieves and formed new chemical bonds.Under the optimal conditions,the concentrations of Zn^(2+),Cu2+and pH value in the effluent treated by neutralization-precipitation combined adsorption were 2.4 mg/L,0.2 mg/L and 6.8,respectively,which met the secondary emission standards of GB 8978—1996.

关 键 词：锌离子 实验室废水 中和沉淀 吸附 

分 类 号：X703[环境科学与工程—环境工程]