内回流对厌氧氨氧化UASB反应器脱氮性能的影响

中国环境科学2016,36(12)：3560~3566ChinaEnvironmentalScience内回流对厌氧氨氧化UASB反应器脱氮性能的影响付昆明*,苏雪莹,王会芳,周厚田(北京建筑大学环境与能源工程学院,城市雨水系统与水环境省部共建教育部重点实验室,北京100044)摘要：温度为30℃±1,℃厌氧氨氧化污泥为接种污泥,人工配制无机废水为进水,通过改变运行方式,研究内回流对厌氧氨氧化反应器不同运行阶段脱氮效能的影响.结果表明:厌氧氨氧化反应器经过42d启动成功,TN去除负荷为3.26kg/(m3·d),TN去除率达到76.04%;内回流对于厌氧氨氧化UASB反应器的培养初期与培养成熟后的阶段,表现出完全不同的特征:启动初期,增设内回流(回流比为92%)对反应器运行有负面影响,TN去除率由无回流时的30%下降到19%;颗粒污泥形成后,增设内回流(回流比为92%)对反应器脱氮性能有正面作用,TN去除率由无内回流时的76%提高到84%.关键词：内回流；厌氧氨氧化；UASB；颗粒污泥；溶解氧中图分类号：X703.1文献标识码：A文章编号：1000-6923(2016)12-3560-07EffectsofinternalrecycleonthenitrogenremovalperformanceofanANAMMOXUASBreactor.FUKun-ming*,SUXue-ying,WANGHui-fang,ZHOUHou-tian(KeyLaboratoryofUrbanStormWaterSystemandWaterEnvironment,MinistryofEducation,SchoolofEnvironmentandEnergyEngineering,BeijingUniversityofCivilEngineeringandArchitecture,Beijing100044,China).ChinaEnvironmentalScience,2016,36(12)：3560~3566Abstract：TheeffectofinternalrecycleonthenitrogenremovalbyanANAMMOXUASBreactoratdifferentstageswasinvestigatedbychangingtheoperatingconditions.ThereactorwasinoculatedwithANAMMOXsludgeandfedbysyntheticinorganicwastewaterat30℃±1℃.TheANAMMOXreactorwassuccessfullystartedupin42days,withtotalnitrogen(TN)removalefficiencyof76.04%attheloadingof3.26kg/(m3⋅d).Duringtheinitialstage,theeffectsofinternalrecycleontheperformanceofANAMMOXUASBreactorwerecompletelydifferentforthestart-upandmaturestage,wheretheinternalrecycle(atrecycleratioof92%)hadnegativeeffectontheTNremoval(theTNremovalefficiencydecreasedfrom30%to19%)whencomparedwiththecasewithoutinternalrecycle.Whengranularsludgewasformed,theinternalrecycle(atrecycleratioof92%)hadpositiveeffectonTNremoval(theTNremovalefficiencyincreasedfrom76%to84%).Keywords：internalrecycle；ANAMMOX；UASB；granularsludge；dissolvedoxygen由氮素污染造成的水体富营养化日益严重,脱氮成为市政污水和工业废水处理的一项重要任务.传统的脱氮工艺为硝化反硝化技术,但常常面临碳源不足的困境.厌氧氨氧化(anaerobicammoniumoxidation,ANAMMOX)是一种新型自养脱氮工艺:缺氧条件下,ANAMMOX细菌以NO2--N为电子受体,将NH4+-N氧化为N2,并产生少量NO3--N[1-2].相比传统脱氮工艺,厌氧氨氧化工艺不需外加碳源,污泥产量低,CO2释放量少,在处理高氨氮废水[3](如污泥消化液[4]、垃圾渗滤液[5]等)显示出低耗能、高效率的优势而受到国内外研究学