游离亚硝酸预处理强化剩余污泥发酵同步反硝化性能

中国环境科学2015,35(3)：742~747ChinaEnvironmentalScience游离亚硝酸预处理强化剩余污泥发酵同步反硝化性能委燕,王淑莹*,马斌,彭永臻(北京工业大学,北京市水质科学与水环境恢复工程重点实验室,北京100124)摘要：考察了游离亚硝酸(FNA)预处理对污泥解体和剩余污泥发酵同步反硝化性能的影响.结果表明,不同FNA浓度(0,0.68,1.35和2.03mgN/L)处理剩余污泥预处理过程中,SCOD的产量和产生速率均随着FNA浓度的增加而增加,其中SCOD的产生速率依次为0.66,1.70,2.13和2.70mg/(gVSS⋅h).随着预处理过程中FNA浓度的增加,剩余污泥中死菌占总菌的比例由41%上升至80%.FNA预处理可使剩余污泥发酵同步反硝化系统SCOD的产量增加49%和污泥减量提高41%,同时使系统反硝化能力提高40%.此外,FNA预处理可使该系统中温室气体N2O产量占NO2-还原量的百分比减少58%.关键词：游离亚硝酸；剩余污泥；预处理；发酵；反硝化中图分类号：X703.1文献标识码：A文章编号：1000-6923(2015)03-0742-06Freenitrousacidpretreatmentenhancesperformanceofwasteactivatedsludgeanoxicfermentationanddenitrificationsystem.WEIYan,WANGShu-ying*,MABin,PENGYong-zhen(BeijingKeyLaboratoryofWaterQualityScienceandWaterEnvironmentRecovery,BeijingUniversityofTechnology,Beijing100124,China).ChinaEnvironmentalScience,2015,35(3)：742~747Abstract：ThisstudyinvestigatedtheimpactofFNA-basedpretreatmentonsludgedisintegrationandwasteactivatedsludgeanoxicfermentationanddenitrificationprocess.Theresultsshowedthattheamountandratesofsolublechemicaloxygendemand(SCOD)productionincreasedwiththeincreasingFNAconcentrations(0,0.68,1.35and2.03mgN/L)duringFNA-basedpretreatmentprocess,ofwhichSCODproductionratewere0.66,1.70,2.13and2.70mg/(VSS⋅h),respectively.Furthermore,thepercentagesofbiocidalcellsaccountingforthetotalcellsofwasteactivatedsludgeincreasedfrom41%to80%.Forthewasteactivatedsludgeanoxicfermentationanddenitrificationsystem,FNA-basedpretreatmentcouldnotonlymadetheSCODproductionandsludgereductionperformanceincreaseby49%and41%,respectively,butalsoanincreaseofdenitrifyingcapacityofthissystemby40%wasachieved.Inaddition,FNA-basedpretreatmentsuccessfullyreducethepercentageofN2OaccountingforthereducedNO2-by58%.Keywords：freenitrousacid；wasteactivatedsludge；pretreatment；fermentation；denitrification基于活性污泥法的众多生物脱氮工艺已广泛应用于城市污水处理领域,但污水中大量的有机物质转移到污泥中导致污泥产量增加,进而加重污水处理厂剩余污泥处理或处置的投资和运行负担.此外,城市污水低碳氮比的特点导致其生物脱氮过程中必需投加外碳源,这就造成污水处理厂的运行费用大大增加.因此,实现剩余污泥的减量化和资源化以及开发污泥内碳源,已成为城市污水处理的难点和重点.基于活性污泥法的众多生物脱氮工艺已广泛应用于城市污水处理领域,但污水中大量的有机物