A_O_SBR中羟胺氧化酶活性变化与N2O的产生_刘婧晶_袁林江_何志仙
- 11408945
-
5 次阅读
-
0 次下载
-
2020-02-02 18:58:36
文档简介:
书A/O-SBR中羟胺氧化酶活性变化与N2O的产生刘婧晶,袁林江,何志仙(西安建筑科技大学环境与市政工程学院,陕西西安710055)摘要:在以A/O方式运行的SBR中,研究了三种不同曝气量下硝化与反硝化过程中N2O的释放及污泥羟胺氧化酶(HAO)活性的变化。结果表明,在曝气量为0.6L/min下,N2O总释放量为2.747mg;好氧段的HAO活性同N2O释放浓度的变化趋势相反。在曝气量为0.8、1.0L/min下,N2O的总释放量分别为1.032、1.006mg,相差不大。在曝气量为0.8L/min下,好氧阶段的HAO活性与N2O释放浓度的变化呈正相关,N2O的释放浓度随HAO活性的增减而相应变化。在曝气量为1.0L/min下,好氧段的HAO活性同N2O释放浓度变化呈相反趋势,HAO活性出现极大值时,N2O释放量出现极小值;反之,亦然。在三种不同曝气方式下,曝气量为0.6L/min时,缺氧段N2O的释放与HAO作用有关,其他条件下N2O的释放则与HAO无关。因此,硝化阶段N2O的释放与HAO活性密切相关,HAO是影响N2O释放途径的关键酶;反硝化阶段释放的N2O主要是反硝化作用的结果,仅当硝化反应进行得不彻底时,反硝化释放的N2O才与HAO相关。关键词:羟胺氧化酶;酶活性;溶解氧;N2O释放量中图分类号:X703文献标识码:A文章编号:1000-4602(2014)09-0027-05基金项目:西安建筑科技大学校青年科技基金资助项目(QN1137)NitrousOxideEmissionandHydroxylamineOxidaseActivityinAnoxic/AerobicSequencingBatchReactorLIUJing-jing,YUANLin-jiang,HEZhi-xian(SchoolofEnvironmentalandMunicipalEngineering,Xi’anUniversityofArchitectureandTechnology,Xi’an710055,China)Abstract:Laboratoryscaleanoxic/aerobicsequencingbatchreactor(A/OSBR)wasusedtoin-vestigatetheemissionofnitrousoxide(N2O)andactivityofhydroxylamineoxidase(HAO)duringnitri-ficationanddenitrificationatthreeaerationrates.Whentheaerationratewas0.6L/min,N2Oemissionamountwas2.747mg,andhydroxylamineoxidaseactivitywasnegativelycorrelatedtoN2Oemissionintheaerobiczone.Whentheaerationratewas0.8L/min,N2Oemissionamountdecreasedto1.032mg,andhydroxylamineoxidaseactivitywaspositivelycorrelatedtoN2Oemissionintheaerobiczone.Whentheaerationratewas1.0L/min,N2Oemissionamountwas1.006mg,andhydroxylamineoxidaseactivi-tywasnegativelycorrelatedtoN2Oemissionintheaerobiczone.Intheanoxiczone,N2Oemissionwascorrelatedtohydroxylamineoxidaseactivityonlyattheaerationrateof0.6L/min.N2Oemissionwascloselycorrelatedtohydroxylamineoxidaseactivityduringnitrification,andHAOwasthekeyenzymere-strictingN2Oemission.N2Oemittedduringdenitrificationwastheresultofdenitrification,andN2Oe-missionwascorrelatedtohydroxylamineoxidaseactivityonlyduringincompletenitrification.·72·第30卷第9期2014年5月中国给水排水CHINAWATER&WASTEWATERVol.30No.9May2014Keywords:hydroxylamineoxidase(HAO);e
评论
发表评论