紫外辐射H2O2与PMS氧化准好氧矿化垃圾床渗滤液尾水

中国环境科学2019,39(9)：3744~3753ChinaEnvironmentalScience紫外辐射H2O2与PMS氧化准好氧矿化垃圾床渗滤液尾水冯梅,陈炜鸣,潘旭秦,李启彬1*,刘丹(西南交通大学地球科学与环境工程学院,四川成都611756)摘要：采用紫外(UV)活化双氧水(H2O2)和过一硫酸盐(PMS)产生活性氧物种降解准好氧矿化垃圾床渗滤液尾水中有机污染物.结果表明,紫外辐射双氧水(UV-H2O2)和紫外辐射过一硫酸盐(UV-PMS)体系对有机污染物的降解相比于单独体系效果显著.初始pH值和氧化剂投加量能够显著影响2种体系的降解效能,增加氧化剂投加量能够一定程度提高2种体系对渗滤液尾水中有机物的去除;2种体系均在酸性条件下效果较好,初始pH值的升高对2种体系过程有机物降解有抑制作用并且对UV-H2O2体系的抑制尤为显著.在最优条件下(初始pH值为3,氧化剂投量为0.084mol/L),UV-H2O2与UV-PMS体系处理后出水COD去除率分别达到了72.09%和56.22%.另外,UV-H2O2体系中主要活性氧物种是羟基自由基,而UV-PMS体系中主要是由羟基自由基和硫酸根自由基的共同作用.紫外-可见光谱与三维荧光光谱表明两体系中均能降解渗滤液尾水中难降解芳香类有机物质,并且UV-PMS较UV-H2O2体系对腐殖质的反应速率更快,但是两种体系对渗滤液尾水中腐殖质的降解途径存在显著差异.研究结果可为光化学氧化处理垃圾渗滤液中难降解有机物提供参考.关键词：紫外-过氧化氢；紫外-过一硫酸盐(UV-PMS)；准好氧矿化垃圾床；垃圾渗滤液；自由基中图分类号：X703.1文献标识码：A文章编号：1000-6923(2019)09-3744-10ComparativestudyonUV-H2O2andUV-PMSprocessoxidationofsemi-aerobicagedrefusebioreactorleachatetailwater.FENGMei,CHENWei-ming,PANXu-qing,LIQi-bin*,LIUDan.(CollegeofGeosciencesandEnvironmentalEngineering,SouthwestJiaotongUniversity,Chengdu611756,China).ChinaEnvironmentalScience,2019,39(9)：3744~3753Abstract：Ultraviolet(UV)activatedhydrogenperoxide(H2O2)andperoxymonosulfate(PMS)thatproducevariousreactiveoxygenspecies(ROS)wereusedtodecomposetheorganicpollutantsofsemi-aerobicagedrefusebioreactorleachatetailwater.Theresultsshowedthatthedegradationefficaciesoforganicpollutantsinultravioletactivatedhydrogenperoxide(UV-H2O2)andultravioletactivatedperoxymonosulfate(UV-PMS)processissignificantlybetterthanthoseofsingleprocess.FactorsincludinginitialpHandoxidantdosageinfluencedthedegradationefficiencygreatlyandincreasingtheconcentrationofoxidantfavoredtheremovalefficiencyoforganicpollutantsinbothtwoprocesses.Meanwhile,acidicambientbenefitedtheremovaloforganicpollutants,however,theremovalefficiencyoforganicpollutantswasreducedbyincreasinginitialpH,especiallyinUV-H2O2process.Underoptimizedconditions(initialpHvalueis3,oxidantdosageis0.084mol/L),72.09%and56.22%CODremovalefficiencieswereyieldedbyUV-H2O2andUV-PMSprocesses,respectively.Inaddition,hydroxylradicalisth