含锌废水中的络合剂对处理效果的影响.pdf

净水技术2016,35(5) : 47 -51 Water Purification Technology 含锌废水中的络合剂对处理效果的影响 赵 瑶 瑶 ，龙 贝 ，袁 萌 希 ，顾 天 翼 ，孙 贤 波 (华东理工大学资源与环境工程学院国家环境保护化工过程环境风险评价与控制重点实验室，上 海 200237) 摘要该文为了探究含锌电镀废水中络合剂的存在对使用氢氧化物沉淀法处理锌的影响，分别通过试验操作以及理论计 算来说明。结果表明，当废水中无络合剂存在时，采用氢氧化物沉淀法即可使锌浓度降到电镀污染物排放标准1. 〇 mg /L 以 下 , pH 8. 5 时均可实现；当废水中出现酒石酸时, pH = 11时可以达到排放标准；当废水中出现柠檬酸、EDTA (乙二胺四乙 酸）络合剂时,采用氢氧化物沉淀法，无法使锌浓度达到排放标准;通过理论计算和作图分析,发现当废水中酒石酸、柠檬酸、 EDTA 各自的总浓度分别为91.55、30. 74、4. 38 mg /L 时，通过氢氧化物沉淀法无法使总锌浓度 1. 0 mg /L ，均与试验结果相 一致。 关键词络合剂 含锌废水 处理效果 化学平衡 化学沉淀 中图分类号：X703.1 文献标识码： A 文章编号：1009 - 0177(2016)05 - 0047 - 05 Influence of Complexing Agents on Treatment Effect of Zinc Containing Wastewater Zhao Yaoyao, Long Bei, Yuan Mengxi, Gu Tianyi, Sun Xianbo ( State Environmental Protection Key Laboratory o f Environmental Risk Assessment and Control on Chemical Process, School o f Resources and Environmental Engineering, East China University o f Science and Technology, Shanghai 200237, China) Abstract To explore the influence of complexing agents in zinc containing electroplating wastewater treatment , experimental and theoretical means were used to describe the effect . The results show that when no complexing agent exists , adjusting pH value of the wastewater can make zinc concentration decrease to electroplating pollutant emission standards 1. 0 mg/L or less , and it can be achieved when pH value is greater than 8 .5 . When tartaric acid appears in wastewater , pH value over 11 can reach the emission standard . When citric acid , or EDTA ( elhylene diamine tetraacetic acid ) is in wastewater , using hydroxide precipitation method cannot reach the emission standard . Besides , theoretical calculation and mapping analysis find that when the total concentration of tartaric acid , citric acid , or EDTA reach 91. 55, 30. 74, 4. 38 mg/L respectively