废水中高浓度氯离子的萃取脱除研究  

Extraction study of high concentration chloride ion in wastewater

作　　者：高行庥 刘田田 孟雪璐 孙天宇 金奇杰 朱成章 周长城 徐海涛 GAO Xing-xiu;LIU Tian-tian;MENG Xue-lu;SUN Tian-yu;JIN Qi-jie;ZHU Cheng-zhang;ZHOU Chang-cheng;XU Hai-tao(School of Environmental Science and Engineering,Nanjing Tech University,Nanjing 211816,China;Nanjing Gek of Institute of Environmental Protection Technology&Equipment Co.,Ltd.,Nanjing 211100,China)

机构地区：[1]南京工业大学环境科学与工程学院,江苏南京211816 [2]南京杰科丰环保技术装备研究院有限公司,江苏南京211100

出　　处：《应用化工》2023年第5期1308-1312,共5页Applied Chemical Industry

基　　金：国家重点研发计划(2021YFB3500600,2021YFB3500605);江苏省重点研发计划(BE2022142);江苏省国际合作项目(BZ2021018);江苏省自然科学基金(BK20220365);江苏省产学研合作项目(BY2022514);2019年度南京“科技顶尖专家集聚计划”。

摘　　要：火力发电作为我国主要发电形式,将在很长一段时间依赖煤炭资源,这将造成二氧化硫等废气污染问题,针对烟气脱硫,湿法脱硫技术是常用手段,但随之而来的就是脱硫废水的处理问题。以溶剂萃取法去除废水中氯离子为研究对象,通过单因素实验考察了稀释剂种类、改质剂种类、萃取液各组分比例、萃取液与水相比例(O/A)等因素对废水中氯离子去除效率的影响。此外,使用质量分数为15%的NaOH为反萃取剂,与萃取液以1∶6比例混合进行二级反萃取,总反萃效率可达77%。通过连续4次萃取液再生回用实验可知,15%NaOH反萃效果出色,萃取液复用性好,多次重复利用其萃取性能没有明显变化。As the main form of power generation in China,thermal power generation will rely on coal resources for a long time,which will cause waste gas pollution such as sulfur dioxide.For flue gas desulfurization,wet desulfurization technology is a common means,but the following is the treatment of desulfurization wastewater.The removal of chloride ions in wastewater by solvent extraction was investigated.Through single factor experiments,the effects of diluent types,modifier types,the proportion of each component of extraction solution,and the proportion of extraction solution to water phase(O/A)on the removal efficiency of chloride ions in wastewater were investigated.In addition,NaOH with a mass fraction of 15%was used as the stripping agent and mixed with the extraction solution in the ratio of 1∶6 for secondary stripping,and the total stripping efficiency could reach 77%.Through four consecutive experiments of regeneration and reuse of extraction solution,it could be seen that 15%NaOH has excellent stripping effect and good reusability of extraction solution,and its extraction performance has not changed significantly after repeated utilization.

关 键 词：脱硫废水 萃取法 氯离子 

分 类 号：TQ028[化学工程] X773[环境科学与工程—环境工程]