复合式A_O工艺处理晚期垃圾渗滤液的脱氮特性_乔文燕

复合式A/O工艺处理晚期垃圾渗滤液的脱氮特性乔文燕,李军,金永祥,张刚,任健(北京工业大学水质科学与水环境恢复工程北京市重点实验室,北京100124)摘要:针对A/O工艺处理晚期垃圾渗滤液的过程中因碳源不足而脱氮效果不佳的问题,在传统A/O工艺的曝气池中加入生物载体而构成复合式A/O工艺,通过创造缺氧微环境来实现同步硝化反硝化(SND),从而达到强化脱氮的目的。考察了温度、溶解氧、pH对亚硝酸盐积累的影响,以及SND对去除总氮的贡献率。结果表明,复合式A/O工艺对晚期垃圾渗滤液的处理效果良好,对氨氮的去除率>99%,出水氨氮<20mg/L,达到了二级排放标准。当回流比为2时,对TN的平均去除率为72%。生物载体的加入,在曝气池内创造了缺氧微环境,为进行SND提供了有利条件,提高了对总氮的去除效果。亚硝化率稳定在95%以上,DO和温度对亚硝化率的影响很小,高pH值是实现亚硝酸盐积累的决定性因素。关键词:渗滤液;复合式A/O工艺;生物载体;同步硝化反硝化中图分类号:X703文献标识码:A文章编号:1000-4602(2010)19-0028-05基金项目:国家自然科学基金资助项目(51078008);北京市自然科学基金资助项目(8092007)CharacteristicsofNitrogenRemovalfromAgedLandfillLeachatebyHybridA/OProcessQIAOWen-yan,LIJun,JINYong-xiang,ZHANGGang,RENJian(KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100124,China)Abstract:Inordertosolvetheproblemofpoornitrogenremovalefficiencyduetoinsufficientcar-bonsourceduringtreatmentofagedlandfillleachatebyA/Oprocess,ahybridA/Oprocesswasestab-lishedbyaddingbiologicalcarriersintotheaerationtankoftheconventionalA/Oprocesssoastoachievesimultaneousnitrificationanddenitrification(SND)bycreatinganoxicmicro-environmentandreachthegoalofenhancednitrogenremoval.Theeffectsoftemperature,dissolvedoxygen(DO)andpHonnitriteaccumulation,andthecontributionofSNDtototalnitrogenremovalwereinvestigated.TheresultsshowthattheremovaleffectofagedlandfillleachatebyhybridA/Oprocessisexcellent,theremovalrateofammonianitrogenismorethan99%,andtheeffluentammonianitrogenislessthan20mg/L,whichmeetsthenationalsecondclassdischargestandard.Whentherefluxratiois2,theaverageremovalrateofTNis72%.AddingbiologicalcarriersintotheaerationtankprovidesfavorableconditionsforSNDbycreatinganoxicmicro-environment,sotheremovalefficiencyoftotalnitrogenisenhanced.Thenitrosati-onrateisstabilizedatmorethan95%,andtheeffectsofDOandtemperatureonnitrosationrateareverysmall,sohighpHisthedecisivefactorfornitriteaccumulation.Keywords:landfillleachate;hybridA/Oprocess;biologicalcarrier;SND·28·第26卷第19期2010年10月中国给水排水CHINAWATER＆WASTE