垃圾渗滤液与城市污水合并处理脱氮_石明岩

文章编号:1007-4929(2009)08-0010-03垃圾渗滤液与城市污水合并处理脱氮石明岩1,冯兆继1,余建恒2,王少林2,夏耿东2(1.广州大学土木工程学院,广东广州510006;2.广州市大坦沙污水处理厂,广东广州510163)摘要:为了解决垃圾渗滤液与城市污水合并处理氮难以稳定达标排放的问题,采用倒置A2/O法合并处理混合污水脱氮。结果表明,水力停留时间是脱氮效果的限制因素,试验条件下水力停留时间至少应保证9h。好氧池溶解氧浓度增加对总氮去除不利;在60%～100%的范围内提高污泥回流比对有机物去除和反硝化有利;混合液回流比在100%～200%范围内增加对反硝化有一定促进作用。在水温25～30℃、泥龄20d、MLSS3000～3500mg/L、HRT11h、DO3mg/L、R80%、r200%时,有机物和脱氮效果同步达到最优,且出水浓度均可稳定地达到《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准。关键词:垃圾渗滤液;倒置A2/O法;城市污水;脱氮;水力停留时间;溶解氧;污泥回流比;混合液回流比中图分类号:X703文献标识码:ANitrogenRemovalinConsolidatedTreatmentofLeachateandMunicipalWastewaterSHIMing-yan1,FENGZhao-ji1,YUJian-heng2,WANGShao-lin2,XIAGeng-dong2(1.SchoolofcivilEngineering,GuangzhouUniversity,Guangzhou510006,China;2.GuangzhouDatanshaSewageTreatmentPlant,Guangzhou510163,China)Abstract:Inordertosolvetheproblemthattheconsolidatedtreatmentofleachateandmunicipalwastewaterisdifficulttoreachthestandardofnitrogen,thereversedA2/Oprocessisusedtoremovalnitrogenintheexperiment.TheresultsshowthatHRT(hydrau-licretentiontime)isthekeyfactorfornitrogenremovalefficiency.HRTshouldbelongatleast9hoursunderthetestconditions.Theincreaseofdissolvedoxygenoftheaerobicbasinishurttothetotalnitrogenremoval.Attherangeof60%to100%,theim-provementofthesludgereturnratiocouldgetbetterorganicanddenitrificationremovaltreatmenteffect.Attherangeof100%to200%,theimprovementofthemixed-liquorreturnratiocouldgetbetterdenitrificationremovaltreatmenteffect.Underthecondi-tionsofwatertemperaturewith25～30℃,SRTwith20d,MLSSwith3000～3500mg/L,HRTwith11h,DOwith3.0mg/L,Rwith80%andrwith200%,theeffectoforganicandnitrogenremovalachievetheoptimalsynchronizationsimultaneouslyandtheeffluentconcentrationcouldsteadilyreachedtheA-levelstandardaccordingtothestandardof'Dischargestandardofpollutantsformunicipalwastewatertreatmentplant'.Keywords:leachate;reversedA2/Oprocess;municipalwastewater;nitrogenremoval;hydraulicretentiontime;dissolvedoxygen;returnratioofsludge;returnratioofmixed-liquor收稿日期:2009-02-12基金项目:广州市科技计划项目(2007J1-Q411);广州市教育局科技项目(08C058);广州大学新苗计划