UASB_A_O工艺处理垃圾渗滤液短程生物脱氮的实现_孙洪伟

中国环境科学2009,29(10)：1059~1064ChinaEnvironmentalScienceUASB-A/O工艺处理垃圾渗滤液短程生物脱氮的实现孙洪伟1,彭永臻1*,时晓宁1,张树军1,杨庆1,侯红勋2(1.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；2.安徽国祯环保节能科技股份有限公司,安徽合肥230088)摘要：应用缺氧/厌氧UASB-A/O组合工艺处理高氮晚期渗滤液,在获得稳定有机物和氮同步去除的前提下,考察了如何实现并维持A/O系统内稳定短程硝化的途径.结果表明:在单一UASB反应器内,同时发生了缺氧反硝化和厌氧产甲烷的反应,有机物和NOx--N去除速率分别为5.3,1.1kg/(m3⋅d).12~30.6℃时,经过54d的运行,A/O反应器实现短程硝化(亚硝态氮积累率>50%),此后亚硝态氮积累率迅速上升,70d后,亚硝态氮积累率稳定在90%以上.在A/O反应器内,游离氨和游离亚硝酸协同作用是实现并维持稳定短程硝化的决定因素.此外,以pH值作为A/O硝化反应进行的过程控制参数,可准确把握硝化终点,避免过度曝气破坏短程硝化,为氨氧化菌的生长创造有利条件,有效抑制亚硝酸盐氧化菌的生长并逐渐从系统中淘洗出去,实现了硝化菌种群的优化,荧光原位杂交技术检测也证明这一点.关键词：垃圾渗滤液；短程硝化；游离氨；游离亚硝酸；荧光原位杂交中图分类号：X703.1文献标识码：A文章编号：1000-6923(2009)10-1059-06AchievingnitrogenremovalfromlandfillleachateviaUASB-A/Oprocess.SUNHong-we1,PENGYong-zhen1*,SHIXiao-ning1,ZHANGShu-jun1,YANGQing1,HOUHong-xun2(1.KeyLaboratoryofBeijingWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100124,China；2.AnHuiGuozhenEnvironmentalProjectionScienceandTechnologyCompanyLimited,Hefei230088,China).ChinaEnvironmentalScience,2009,29(10)：1059~1064Abstract：Treatmentofrealleachatefrommunicipallandfillwithhighammonianitrogencontentwasinvestigatedbyusinglab-scaleanoxic/anaerobicUASB-A/Oprocess.OnthebasisofachievingsimultaneousCODandnitrogenremoval,howtoachieveandstabilizepartialnitrificationintheA/Oreactorwasstudied.DenitrificationandmethanogenesiswereconductedinUASBreactor,andtheaverageremovalrateoforganicsandNOx--Nwere5.3,1.1kg/(m3·d),respectively.Partialnitrificationwasachieved(nitriteaccumulationratiowasabove50%)after54daysoperation,andafter70days,nitriteaccumulationratioinA/Oreactorreachedabove90%atambienttemperatureof12to30.6℃.Stableandlongtermpartialnitrificationwasachievedduetothecooperativeeffectoffreeacid(FA)andfreenitrousacid(FAN).DestructionofpartialnitrificationcausedbyextendedaerationwasavoidedbyusingpHasprocesscontrolparameter.NitrifyingpopulationwasoptimizedbyestablishingfavorableenvironmentofAOBandinhibitingthegrowthofNOB,thenNOBwaswashedoutfromthebiologicalsys