流量分配对短程生物脱氮过程中N2O产生的影响

环境科学学报ActaScientiaeCircumstantiae流量分配对短程生物脱氮过程中N2O产生的影响巩有奎1,2彭永臻2王淑莹21.石家庄铁路职业技术学院，石家庄，0500412.北京工业大学环境与能源工程学院,北京，100022摘要摘要:利用SBR反应器，通过在线pH曲线控制好氧-缺氧反应时间，成功实现了短程生物脱氮过程，并考察了分段进水条件下流量分配对SBR反应器运行性能及N2O产量的影响。结果表明，与原水分两次在不同阶段等量加入反应器的二段进水方式相比，原水分三次等量进入反应器的三段进水能够有效降低脱氮过程中外碳源投加量和氧化亚氮产量；氧化亚氮主要产生于硝化过程，反硝化过程能够将硝化阶段积累的N2O还原至N2。两次、三次等量进水条件下，生物短程脱氮过程中乙醇投加量分别为0.8mL和0.6mL，N2O产量分别为8.86和5.05mgN·L-1。硝化过程中NO2--N的积累是导致系统N2O产生的主要原因。关键词：关键词：生活污水；短程生物脱氮；流量分配；N2O；好氧反硝化中图分类号：中图分类号：X703文献标识码：文献标识码：文章编号：文章编号：TheimpactofflowdistributiononN2Oemissionduringshort-cutbiologicalnitrogenremovalprocessGongYoukui1,2,PengYongzhen2,*WangShuying21.ShijiazhuangInstituteofRailwayTechnology,Shijiazhuang,050041，China2.ColegeofEnvironmentalandEnergyEngineering,BeijingUniversityofTechnology,Beijing100022Abstract：Astep-feedsequencingbatchreactor(SBR)wasproposedtomakefulluseoftheinfluentcarbonsourceandreduceexternalcarbonsourceaddition．Throughon-linepHcontrolling,twodifferentstep-feedmodeswerecomparedintermsofnitrogenremovalefficiencyandN2Oemissions.Comparedwithtwo-equalinfluentflowmode,boththeexternalcarbonadditionandN2Oemissionweredecreasedinthree-equalinfluentflowmode.ItwasfoundthatmostoftheN2Owasproducedandemittedduringnitrificationprocess.Fordenitrification,thedissolvedN2OaccumulatedduringnitrifyingprocesscouldbereducedtoN2providedthatsufficientcarbonsourcewasadded.Theamountofethanoladditionfortwo-andthree-equalinfluentflowswere0.8mLand0.6mL,respectively,whileN2Oemissiondecreasedfrom8.86mgN·L-1to5.05mgN·L-1.TheaccumulationofnitriteduringnitrificationwasapotentiallykeyfactorthatresultedinN2Oemission.KeyWords：domesticsewage,short-cutnitrogenremoval,flowingdistribution,nitrousoxide;nitrifierdenitrification基金项目：河北省高等学校科学技术研究青年基金项目（QN20131172）；“十一五”国家科技支撑计划重点项目(2009BAC57B01-2);河北省科技厅科技支撑计划项目(12273611)SupportedbyYouthFoundationofHebeiProvinvce（QN20131172）;NationalKeyTechnologiesR&DProgramofChinaduringtheEleventhFive-yearPlanPeriod(2009BAC57B01-2)andtheKeyTechnologiesR&DProgramofHebei,China(No.12273611).作者简介：巩有奎（