高级氧化法处理电厂综合废水反渗透浓水工艺研究  

Research on advanced oxidation process for reverse osmosis concentrated water

作　　者：李萍 陈丽芳[1,2] 张野 张泽亚[3] LI Ping;CHEN Li-fang;ZHANG Ye;ZHANG Ze-ya(College of Chemical Engineering and Materials Science,Tianjin University of Science and Technology,Tianjin 300457,China;Tianjin Key Laboratory of Marine Resources and Chemistry,Tianjin University of Science and Technology,Tianjin 300457,China;Tianjin Huangpu Salinization Engineering Technology Limited Company,Tianjin 300457,China)

机构地区：[1]天津科技大学化工与材料学院,天津300457 [2]天津科技大学海洋资源与化学重点实验室,天津300457 [3]天津黄埔盐化工程技术有限公司,天津300457

出　　处：《应用化工》2022年第1期119-123,共5页Applied Chemical Industry

基　　金：“十三五”海洋经济创新发展示范项目(BHSF2017-16)。

摘　　要：电厂反渗透浓水COD为520 mg/L,难降解有机物会影响纳滤、电渗析及蒸发结晶系统的稳定运行,为降低电厂反渗透浓水COD,分别采用芬顿氧化和臭氧/活性炭氧化工艺进行处理,选择最佳工艺。臭氧催化氧化研究表明,最佳反应条件为pH=9,活性炭投加量为2 g/L,反应时间为80 min,此时COD的去除率为42.2%,溶液中COD残余浓度为220 mg/L。芬顿催化氧化研究表明,影响芬顿催化氧化的主次因素为:H_(2)O_(2)投加量>m(Fe^(2+))∶m(H_(2)O_(2))>pH值>反应时间,最佳反应条件为H_(2)O_(2)投加量5 mg/L,pH=4,反应时间100 min,m(Fe^(2+))∶m(H_(2)O_(2))=1.2∶1,此时COD去除率69.1%,溶液中COD残余量浓度为160 mg/L。对比两种方法,对于COD去除率而言,选用芬顿氧化法较优。The COD of concentrated reverse osmosis water in power plants is 520 mg/L.The refractory organic matter will affect the stable operation of nanofiltration,electrodialysis and evaporative crystallization systems.To reduce the COD of concentrated reverse osmosis water in power plants,Fenton oxidation and ozone/activated carbon oxidation processes are used respectively.Treatment,choose the best process.Ozone catalytic oxidation studies show that the optimal reaction conditions are pH=9,activated carbon dosage is 2 g/L,and the reaction time is 80 min.At this time,the removal rate of COD is 42.2%,and the residual COD concentration in the solution is 220 mg/L.Fenton catalytic oxidation studies show that the primary and secondary factors affecting Fenton catalytic oxidation are:H_(2)O_(2) dosage>m(Fe^(2+))∶m(H_(2)O_(2))>pH>reaction time.The optimal reaction condition for Fenton catalytic oxidation is H_(2)O_(2) dosage is 5 mg/L,pH=4,reaction time is 100 min,m(Fe^(2+))∶m(H_(2)O_(2))=1.2∶1,at this time,the COD removal rate is 69.1%,and the residual COD concentration in the solution is 160 mg/L.By comparing the two methods,the Fenton oxidation method was selected to remove COD in RO concentrated water.

关 键 词：反渗透浓水 芬顿氧化法 臭氧催化氧化法 

分 类 号：TQ209[化学工程—有机化工]