硫酸根自由基降解二级出水中有机物的研究

高级氧化技术作为二级出水的净化工艺,是满足再生水水质要求的途径之一。基于硫酸根自由基在高级氧化技术中的应用,探讨过硫酸盐(PS)和过一硫酸盐(PMS)经能量激发(加热、紫外照射)和过渡金属催化(Fe~0、Fe~(2+)、Ag~+、Co~(2+))产生SO_4~-·来降解二级出水中难降解有机物的效果。实验结果表明:基于SO-4·的高级氧化技术可有效降解二级出水中溶解性有机碳;其中,以PS为氧化剂、Ag(I)为催化剂的体系对DOC去除率最高(93%);在能量激发体系中,80℃条件下,以PS为氧化剂的体系对DOC去除率次之(88%);但从催化剂的使用浓度及整体的降解效果来看,能量激发体系优于过渡金属催化体系。

TREATMENT PERFORMANCE OF LANDFILL LEACHATE BY MFC-FO COMBINED PROCESS

Landfill leachate treatment performance and power-generation by MFC-FO combined process were studied.Operation parameters of open circuit,no cathode aeration and closed-circuit cathode aeration were changed to optimize the process with the landfill leachate as the anode solution.Ultraviolet spectrum was used to analysis the changes of the pollutants in MFC-FO combined process.Results showed that removal efficiencies when the cathode of MFC was operated in closedcircuited and aerated mode was highest than those in open circuit and no aeration modes.TOC,COD,ammonia nitrogen and total nitrogen removal efficiencies could achieved 95.45％,91.28％,71.77％ and 79.43％,respectively.Ultraviolet spectrum indicated that the unsaturated bond in landfill leachate was damaged and the stability of compound became weakness after treatment.After treatment by MFC-FO process,characteristic peak of organic matter in the effluent was not found.It also illustrated that most of the organic materials was removed by MFC-FO combined process.