游离氨对城市生活垃圾渗滤液短程硝化的影响_吴莉娜

游离氨对城市生活垃圾渗滤液短程硝化的影响吴莉娜,彭永臻＊,王淑莹,张树军(北京工业大学环境与能源工程学院,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:为了考察游离氨(freeammonia,FA)对高氮城市生活垃圾渗滤液短程硝化的影响,采用“两级UASB-缺氧-好氧系统”处理实际城市生活垃圾渗滤液.首先在UASB1中实现同时反硝化与产甲烷反应,COD在UASB2中进一步去除,在AO反应器中利用残余COD进行反硝化以及将NH+4-N彻底硝化.试验共进行79d,经历3个阶段,即稳定短程硝化(40d)、短程硝化破坏(19d)、短程硝化恢复(20d).结果表明,适当的游离氨浓度(40～70mg·L-1)可实现稳定的短程硝化,如在阶段1中亚硝态氮积累率为97%,氨氮的去除率为99%.但游离氨浓度在160mg·L-1左右会抑制全部的硝化反应.在阶段3中,通过稀释原水降低了游离氨浓度,在短时间内就恢复了短程硝化.可见,游离氨是实现和维持城市生活垃圾渗滤液短程硝化的重要影响因素.关键词:垃圾渗滤液;脱氮;短程硝化;游离氨;抑制中图分类号:X705文献标识码:A文章编号:0250-3301(2008)12-3428-05收稿日期:2007-12-11;修订日期:2008-01-18基金项目:城市水资源与水环境国家重点实验室开放研究项目(QAK200802);北京市教委科技创新平台项目(PXM2008-014204-050843)作者简介:吴莉娜(1978～),女,博士研究生,主要研究方向为水污染控制,E-mail:cai@emails.bjut.edu.cn＊通讯联系人,E-mail:pyz@bjut.edu.cnEffectofFreeAmmoniaontheShort-CutNitrificationoftheMunicipalLandfillLeachateWULi-na,PENGYong-zhen,WANGShu-ying,ZHANGShu-jun(KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,CollegeofEnvironmentalandEnergyEngineering,BeijingUniversityofTechnology,Beijing100124,China)Abstract:Asystemconsistingofatwo-stageUASBandanoxic-oxicreactorwasusedtostudytheinfluenceofFAonshort-cutnitrificationoftheactualmunicipallandfillleachatewithhighammoniaconcentration.IntheUASB1,denitrificationandmethanogenesistookplacesimultaneously.TheeffluentCODofUASB1wasfurtherremovedintheUASB2.ThenthedenitrificationofnitriteandnitrateinthereturnedsludgebyusingtheresidualCODandnitrificationwasfinishedintheAOreactor.Theexperimentexperiencedthreestagesduring79d.Thestableshort-cutnitrificationwasachievedinthefirststage(40d).Theshort-cutnitrificationwasdamagedinthesecondstage(19d),andtheshort-cutnitrificationwasrecoveredinthelaststage(20d).Theresultsof79dshowedthatwhentheFAconcentrationwasabout40-70mg·L-1,thestableshort-cutnitrificationcouldbeachieved.Forexample,thenitriteaccumulationwas97%inthesystemduringthefirststage,andtheammoniaremovalefficiencywas99%.ButwhentheFAconcentrationwasabout160mg·L-1,thenitrificationwouldbeinhibited.Inthethirdstage,rawleachatewasdilute