微纳米气泡/UV/H_(2)O_(2)协同处理垃圾渗滤液中典型污染物  

Synergistic treatment of typical pollutants in waste leachate by microbubbles/UV/H_(2)O_(2)

作　　者：方檬 傅敏 李易[1] 杨眉 FANG Meng;FU Min;LI Yi;YANG Mei(School of Environment and Resources,Chongqing Technology and Business University,Chongqing 400067,China;Chongqing Key Laboratory of Catalysis and New Environmental Materials,Chongqing Technology and Business University,Chongqing 400067,China;Chongqing Key Laboratory of Catalytic Theory and Application Technology for Universities,Chongqing Technology and Business University,Chongqing 400067,China)

机构地区：[1]重庆工商大学环境与资源学院,重庆400067 [2]重庆工商大学催化与环境新材料重庆市重点实验室,重庆400067 [3]重庆工商大学重庆高校催化理论与应用技术重点实验室,重庆400067

出　　处：《化学工程》2024年第7期7-13,共7页Chemical Engineering(China)

基　　金：重庆市科技局项目(cstc2020jscx-msxmx0096);重庆工商大学研究生创新型科研项目(yjscxx2023-211-40)。

摘　　要：以垃圾渗沥液中的典型有机污染物正己酸为处理目标,探究其在MB(微纳米气泡)联合UV(紫外光)活化H_(2)O_(2)的作用下的降解规律,探讨不同处理方式、微纳米气泡进气量、紫外灯功率、初始pH值、H_(2)O_(2)体积分数以及共存离子等影响因素对模拟垃圾渗沥液COD降解效果的影响。结果表明:MB/UV/H_(2)O_(2)体系的协同系数达到31.56,证明其有显著的协同效应,该体系能够有效降低模拟垃圾渗滤液中的COD,其降解过程符合拟一级反应动力学模型。当反应时间180 min、H_(2)O_(2)体积分数2×10^(-3)、pH=4、UV功率10 W、MB进气量30 mL/min时,模拟垃圾渗沥液COD去除率可达到94.54%,TOC(总有机碳)去除率为59.10%。共存离子实验表明,实际垃圾渗滤液中的氯离子会降低反应速率。自由基淬灭实验结合EPR结果表明,在MB/UV/H_(2)O_(2)体系中主要产生羟基自由基和单线态氧。Taking n-caproic acid,a typical organic pollutant in landfill leachate,as the treatment target,the degradation rule was investigated by using a combined system of MB(microbubbles)and UV(ultraviolet light)with activated H_(2)O_(2).The effects of various parameters including different treatment methods,microbubble intake,UV lamp power,initial pH,H_(2)O_(2)volume fraction,and presence of coexisting ions on the chemical oxygen demand COD degradation in simulated waste leachate were meticulously examined.The results show that the synergistic coefficient reaches 31.56 in the MB/UV/H_(2)O_(2)system,which proves that it has a significant synergistic effect.The system can effectively reduce COD in simulated waste leachate,and the degradation process conforms to single-stage kinetic reaction model.When the reaction time is 180 min,H_(2)O_(2)volume fraction is 2×10^(-3),pH=4,UV power is 10 W,and MB inlet volume is 30 mL/min,the COD and TOC(total organic carbon)removal rates are 94.54%and 59.10%,respectively.Chloride ions presenting in actual waste leachate diminish the reaction rate in coexisting ion experiments.The results of free radical quenching combined with EPR indicate that the primary generation of hydroxyl radicals and singlet oxygen are mainly produced in MB/UV/H_(2)O_(2)system.

关 键 词：微纳米气泡 UV H_(2)O_(2) 垃圾渗沥液:正己酸 

分 类 号：X703[环境科学与工程—环境工程]