调整气水比优化高氨氮废水BAF一体化脱氮

中国环境科学2019,39(9)：3807~3813ChinaEnvironmentalScience调整气水比优化高氨氮废水BAF一体化脱氮李海鑫,刘秀红*,杨忠启,刘润雨,武文君,杨庆(北京工业大学,城镇污水深度处理与资源化利用技术国家工程实验室,北京100124)摘要：为实现常温下高氨氮废水中氮的高效去除,选取8:1、12:1和15:1等3个气水比(GWR)条件,考察常温下曝气生物滤池(BAF)短程硝化-厌氧氨氧化(ANAMMOX)一体化自养脱氮工艺稳定运行的性能.研究结果表明:进水氨氮(NH4+-N)浓度为400mg/L、回流比为1:1的条件下,GWR为15:1脱氮效果最好,氨氮去除率(ARE)达90%以上,总氮(TN)去除负荷为1.1kgN/(m3·d),去除率达83%.GWR为15:1时,溶解氧(DO)为2.41~4.22mg/L,进水NH4+-N转化为亚硝(NO2--N)量增加,ANAMMOX活性增强.对生物膜进行功能菌种实时荧光定量PCR(qPCR)分析得出,GWR为15:1时,ANAMMOX和氨氧化菌(AOB)两者丰度均最高,高达1012copies/gdrysludge以上,一体化脱氮效果最好.同时,研究表明提高GWR后ANAMMOX反应增强,而过程中无N2O生成,GWR为15:1时,N2O总释放量最小,释放因子为0.0012.关键词：曝气生物滤池；生物膜；高氨氮废水；气水比；分子生物学；氧化亚氮中图分类号：X703.1文献标识码：A文章编号：1000-6923(2019)09-3807-07OptimizationoftheintegratednitrogenremovalprocessofhighammonianitrogenwastewaterinBAFbyadjustingthegaswaterratio.LIHai-xin,LIUXiu-hong*,YANGZhong-qi,LIURun-yu,WUWen-jun,YANGQing(NationalEngineeringLaboratoryforAdvancedMunicipalWastewaterTreatmentandReuseTechndogy,BeijingUniversityandTechnology,Beijing100124,China).ChinaEnvironmentalScience,2019,39(9)：3807~3813Abstract：Inordertoachieveefficientremovalofnitrogenfromhighammonianitrogenwastewateratroomtemperature,thisstudyselectedthreegaswaterratioconditions,8:1、12:1and15:1respectively.Itinvestigatedthestableoperationperformanceofpartialnitrification-ANAMMOXintegratedautotrophicnitrogenremovalprocessofbiologicalaeratedfilter(BAF)atroomtemperature.Theresultsshowedthatgaswaterratio(GWR)attheoptimaloperationtimewas15:1undertheconditionofinletammonianitrogen(NH4+-N)concentrationof400mg/Landrefluxratioof1:1,ammonianitrogenremovalrate(ARE)wasover90%,totalnitrogen(TN)removalloadwas1.1kgN/(m3·d),andTNremovalratecouldreach83%.WhentheGWRis15:1,theDOiscontrolledaround2.41mg/Land4.22mg/L,theamountofNH4+-Nconvertedintonitrite(NO2--N)inwaterincreased,andtheANAMMOXactivityisenhanced.Thereal-timefluorescencequantitativePCR(QPCR)analysisoffunctionalstrainsonthebiofilmshowedthatwhentheGWRwas15:1,bothANAMMOXandAOBhadthehighestabundance,morethan1012copies/gdrysludge.Therefore,integrate