前置反硝化BAF工艺处理景观水体_伊学农

前置反硝化BAF工艺处理景观水体伊学农1,高玉琼1,李晨光1,谭学军2(1.上海理工大学环境与建筑学院,上海200093;2.上海市政工程设计研究总院,上海200092)摘要:为了提高曝气生物滤池(BAF)对景观水体的脱氮效果,开发了前置反硝化BAF工艺,考察了其对景观水体的处理效果及影响因素,并与传统BAF工艺作比较。结果表明,前置反硝化BAF工艺对TN和浊度的去除效果明显优于传统BAF工艺,前者对TN和浊度的平均去除率分别为45%和88%,而后者的分别为30%和47%;两种工艺对COD和氨氮的去除效果相近,但前置反硝化BAF工艺的出水水质更稳定;对于前置反硝化BAF工艺,当水力负荷为1.42～4.95m/h时,对COD、氨氮和TN的去除率均随水力负荷的增加而降低;在水力负荷为2.12m/h的条件下,回流比对COD和氨氮的去除效果影响不大,但对TN的去除率随回流比的增加呈先升高后降低的趋势,最佳回流比为1.5∶1;另外,对TN的去除率随进水C/N值的增加而升高,当C/N>6时,系统的脱氮效果较好。关键词:曝气生物滤池;景观水体;前置反硝化;脱氮中图分类号:X703文献标识码:C文章编号:1000-4602(2010)05-0069-04基金项目:国家科技支撑计划项目(2007BAK27B05-4)TreatmentofLandscapeWaterbyPre-denitrificationBiologicalAeratedFilterYIXue-nong1,GAOYu-qiong1,LIChen-guang1,TANXue-jun2(1.CollegeofEnvironmentandArchitecture,UniversityofShanghaiforScienceandTechnology,Shanghai200093,China;2.ShanghaiMunicipalEngineeringDesignGeneralInstitute,Shanghai200092,China)Abstract:Inordertoimprovetheremovalefficiencyofnitrogenfromlandscapewaterbybiologicalaeratedfilter(BAF),thepre-denitrificationBAFprocesswasdeveloped.Thetreatmentefficiencyoflandscapewaterandtheinfluencefactorswereinvestigated,andthepre-denitrificationBAFwascom-paredwithtraditionalBAF.TheresultsindicatethattheremovalefficienciesofTNandturbiditybythepre-denitrificationBAFarebetterthanthosebytraditionalBAF.TheremovalratesofTNandturbiditybythepre-denitrificationBAFandtraditionalBAFare45%,88%and30%,47%respectively.There-movalefficienciesofCODandammonianitrogenbytwokindsofprocessesaresimilar,buttheeffluentqualityofthepre-denitrificationBAFismorestable.Forthepre-denitrificationBAF,whenthehydraulicloadis1.42to4.95m/h,theremovalratesofCOD,ammonianitrogenandTNdecreasewiththehy-draulicloadincreasing.Whenthehydraulicloadis2.12m/h,thereturnratiohaslittleeffectonthere-movalofCODandammonianitrogen,buttheremovalrateofTNincreasesfirstandthendecreaseswith·69·第26卷第5期2010年3月中国给水排水CHINAWATER＆WASTEWATERVol.26No.5Mar.2010thereturnratioincreasing,andtheoptimalreturnratiois1.5∶1.Inaddition,theremovalrateofTNin-creaseswithincreasingoftheinfluentC/Nratio