芬顿阴极-电凝聚臭氧气浮工艺处理MBR出水特性

Treatment of effluent from MBR by Fenton cathode-electrocoagulation ozone air flotation process

为去除垃圾渗滤液MBR出水有机物,以铝(Al)为阳极,碳聚四氟乙烯(C-PTFE)为阴极构建了芬顿阴极-电凝聚臭氧气浮工艺,通过与常规电絮凝阴极(Al和SS)对比,探明了该工艺对垃圾渗滤液MBR膜出水的去除特性.结果表明:在pH5和臭氧流量为300mL/min时,芬顿阴极体系相比于SS和Al阴极体系对COD的去除率分别提高了30.03%和15.16%.根据三维荧光特征分析,证明了C-PTFE阴极体系对腐殖酸类有较好的去除效果.选取MBR出水中典型难降解有机物布洛芬(IBP),阐明了该工艺的有机物降解机制.研究表明,相比于SS阴极和Al阴极,C-PTFE阴级体系的H_(2)O_(2)产量分别提高了63.27%和122.22%,由淬灭实验得出·OH不仅通过H_(2)O_(2)与O3反应生成,还通过·O_(3)^(-)与H_(2)O生成,证明C-PTFE阴极对电凝聚臭氧气浮工艺有一定的强化作用,更有利于有机物的去除.

In order to remove organic matter in landfill leachate MBR effluent,the Fenton cathode-electrocoagulation ozone air flotation process was constructed with aluminum(Al)as anode and carbon polytetrafluoroethylene(C-PTFE)as cathode.The removal characteristics of this process for landfill leachate MBR membrane effluent were investigated by comparing with the conventional electrocoagulation cathode(Al and SS).When the pH5and ozone flow were 300mL/min,the COD removal rate of Fenton cathode system was increased by 30.03%and 15.16%,respectively,compared with that of SS and Al cathode systems.According to the analysis of three-dimensional fluorescence characteristics,the C-PTFE cathode system had a good removal effect on humic acids.A typical refractory organic compound IBP(ibuprofen)was selected in MBR effluent to clarify the mechanism of organic degradation.The results showed that compared with SS cathode and Al cathode,the H_(2)O_(2) production of C-PTFE cathode system was increased by 63.27%and 122.22%,respectively.The quenching experiment showed that·OH was generated not only through the reaction of H_(2)O_(2) and O_(3),but also through the reaction of O_(3)^(-)and H_(2)O,it was proved that THE C-PTFE cathode had a certain strengthening effect on the electrocoagulation ozone flotation process,and was more conducive to the removal of organic matter.