沸石床多级生物膜系统处理焦化废水的研究_赵文涛

沸石床多级生物膜系统处理焦化废水的研究赵文涛1,2,黄霞1,2,何苗1,2,张彭义1,2,左晨燕1,2(1.清华大学环境科学与工程系,北京100084;2.清华大学环境模拟与污染控制国家重点联合实验室,北京100084)摘要:采用沸石床多级生物膜系统处理焦化废水,考察了沸石填料对NH3-N的吸附特性以及系统的启动性能、去除效果和功能分区。结果表明,在25℃时,沸石填料对NH3-N的吸附符合Langmuir等温式,极限吸附容量为0.318mg/g;系统启动时间约为40d,其中挂膜为7d,硝化菌驯化为3d,异养菌驯化为30d;稳定运行条件下,当系统进水NH3-N负荷≤0.10kg/(m3·d)时,出水NH3-N和COD平均浓度分别为(2.4±1.2)mg/L和(134±34)mg/L,平均去除率分别为98.1%和85.8%,NH3-N达到了国家一级排放标准,COD达到了国家二级排放标准;系统的好氧段出现了三个功能区,即以去除COD为主的C区、同时去除COD和NH3-N的C/N区及以去除NH3-N为主的N区。关键词:焦化废水;沸石;多级生物膜系统中图分类号:X703.1文献标识码:A文章编号:1000-4602(2008)13-0018-05基金项目:国家杰出青年基金资助项目(50725827)StudyonZeoliteBedMultistageBiofilmSystemforTreatmentofCokingWastewaterZHAOWen-tao1,2,HUANGXia1,2,HEMiao1,2,ZHANGPeng-yi1,2,ZUOChen-yan1,2(1.DepartmentofEnvironmentalScienceandEngineering,TsinghuaUniversity,Beijing100084,China;2.StateKeyJointLaboratoryofEnvironmentalSimulationandPollutionControl,TsinghuaUniversity,Beijing100084,China)Abstract:Thezeolitebedmultistagebiofilmsystemwasusedtotreatcokingwastewater.Thead-sorptioncharacteristicsofammonianitrogenbyzeolitemedia,start-up,pollutantsremovalandfunctionzonesofthesystemwereinvestigated.Theresultsindicatethattheadsorptionofammonianitrogenbyzeo-litemediafollowstheLangmuiradsorptionisothermequation,withmaximumadsorptioncapacityof0.318mg/gat25℃.Thestart-uptimeofthesystemisabout40days,consistingof7daysforbiofilmforma-tion,3daysfornitrobacteriadomesticationand30daysforheterotrophicbacteriadomestication.WhentheNH3-Nloadinginthesysteminfluentislessthanorequalto0.10kg/(m3·d),theaverageefflu-entNH3-NandCODconcentrationsare(2.4±1.2)mg/Land(134±34)mg/Lwithaverageremovalratesof98.1%and85.8%,respectively.TheNH3-Nmeetsthenationalfirstclassdischargestandard,andtheCODmeetsthenationalsecondclassdischargestandard.Threedifferentpollutantremovalfunc-tionzones,namedasdecarbonizationzone,decarbonization/nitrificationzoneandnitrificationzoneexistinaerobicstage.·18·第24卷第13期2008年7月中国给水排水CHINAWATER＆WASTEWATERVol.24No.13Jul.2008Keywords:cokingwastewater;zeolite;multistagebiofilmsystem焦化废水中含有大量的酚、氰、NH3