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时间:2020-04-17
《短程同步硝化反硝化过程的脱氮与N2O释放特性.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、2第01334年卷5第月5期环境科学Vo1.34.No.5May,2013ENVIR0NMENTALSCIENCE短程同步硝化反硝化过程的脱氮与N2o释放特性梁小玲,李平,吴锦华,王向德(华南理工大学环境与能源学院,工业聚集区污染控制与生态修复教育部重点实验室,污染控制与生态修复广东省普通高等学校重点实验室,广州510006)摘要:采用气升环流生物反应器建立全程同步硝化反硝化(SND)体系,在此基础上,通过提高进水pH值从而增加反应器中的游离氨(FA)浓度,可以实现全程SND向短程SND的转变.以全程SND过程为参照,分析了短程SND过程的
2、脱氮及N,0释放特性.结果表明,短程SND过程的总氮平均去除率及SND平均效率分别为71.9%和80.9%,比全程SND过程分别提高了18.0和16.8个百分点,短程SND过程的平均总氮去除速率为0.11mg·(L·rain),是全程SND过程的1.4倍.虽然短程SND较全程SND具有更高的脱氮效率,但该过程的NO平均转化率为57.1%,NO平均累积释放量约为全程SND过程的5倍.研究还发现,N,O的释放量急剧上升与体系中NO;一N的积累浓度升高密切相关.关键词:短程同步硝化反硝化;N,0;亚硝酸盐;好氧颗粒污泥;生物脱氮中图分类号:X70
3、3.1文献标识码:A文章编号:0250.3301(2013)05.1845.06NitrogenRemovalandN2OEmissionCharacteristicsDuringtheShortcutSimultaneousNitrificationandDenitrificationProcessLIANGXiao—ling,LIPing,WUJin—hua,WANGXiang—de(KeyLaboratoryofPollutionControlandEcosystemRestorationinIndustryClusters,Mini
4、stryofEducation,KeyLaboratoryofEnvironmentalProtectionandEco—RemediationofGuangdongRegularHigherEducationInstitutions,CollegeofEnvironmentandEnergy,SouthChinaUniversityofTechnology,Guangzhou510006,China)Abstract:Completesimuhaneousnitrificationanddenitrification(SND)wasach
5、ievedinanairliftcirculationbioreactor.Basedonthiscondition,thesystemcouldbeswitchedtoshortcutSNDasthefreeammonia(FA)concentrationwasincreasedwithhigherinfluentpH.ThenitrogenremovalandN2OemissioncharacteristicsoftheshortcutSNDprocesswereinvestigatedandthoseofthecompleteSNDp
6、rocesswerealsoobservedascontro1.IntheshortcutSNDprocess,theaveragetotalnitrogenremovalandaverageSNDeficiencyreached71.9%and80.9%,whichwas18.0and16.8percentshigherthanthoseinthecompleteSNDprocess,respectively.Inaddition,thetotalnitrogenremovalrateintheshortcutSNDprocesswas0
7、.11mg·(L·min)~,1.4timesashighasthatinthecompleteSNDprocess.AlthoughhighernitrogenremovaleficiencywasobtainedintheshortcutSNDprocess,themeanN20conversionratereached57.1%andtheaverageN20accumulatedemissionamountwasapproximately4timeshigherthanthatinthecompleteSNDprocess.Ther
8、esultsalsoindicatedthattheincreaseofNO;一Nconcentrationinthereactorshouldberesponsiblefort
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