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1、倒置AAO工艺聚磷微生物的吸磷行为陈洪斌1,2*,唐贤春1,何群彪2,屈计宁1,高廷耀2(1.同济大学污染控制与资源化研究国家重点实验室,上海200092;2.同济大学城市污染控制国家工程研究中心,上海200092)摘要:采用人工配水和市政污水研究了“缺氧-厌氧-好氧”(倒置AAO)脱氮除磷工艺中,聚磷微生物(PAOs)在低碳源、高硝酸盐环境下的释磷和吸磷行为.结果表明,在低碳源、高氮和磷环境中,尽管PAOs在缺氧厌氧段释磷程度低,如果适当延长厌氧段和好氧段的HRT、且好氧曝气较充分,仍能超量吸收磷.PA
2、Os过量吸磷的能量来源不仅仅是厌氧段吸收与合成的胞内聚合物在好氧段的氧化,还来自好氧环境正常代谢过程中多余的能量.外加碳源的投加时间点对PAOs吸磷的影响不显著.PAOs在厌氧段后期出现过量吸磷现象,推测是细胞内有机物厌氧降解产生的ATP通过某种代谢途径被用于无机磷的吸收.关键词:生活污水;脱氮除磷;聚磷菌;厌氧磷吸收中图分类号:X703.5文献标识码:A文章编号:1000-6923(2007)01-0049-05Phosphorusuptakingbehaviorofphosphorusaccumula
3、tingorganismsinreversedAAOProcess.CHENHong-bin1,2*,TANGXian-chun1,HEQun-biao2,QUJi-ning1,GAOTing-yao2(1.StateKeyLaboratoryofPollutionControlandResourceReuse;2.NationalEngineeringResearchCenterforUrbanPollutionControl,TongjiUniversity,Shanghai200092,China)
4、.ChinaEnvironmentalScience,2007,27(1):49~53Abstract:Thephosphorusreleaseanduptakebehaviorofphosphorusaccumulatingorganisms(PAOs)in“anoxic-anaerobic-aerobic”denitrificationandphosphorusremovalprocess(namelyreversedAAO)withlowcarbonnutrientsandhighnitratewe
5、reexploredusingartificialwastewaterandmunicipalwastewater.PhosphorusreleaseofPAOsisincompletewithlowcarbonnutrientandhighnitrateinanoxicandanaerobicstage,however,asuitableprolongedanaerobictime,aeratingtimeandenoughoxygencaninitiatephosphorusultra-uptakeo
6、fPAOs;theenergysourceofphosphorusultra-uptakebyPAOswasduetonotonlytheintracellularPHBsynthesizedduringanaerobicstage,butalsothesurplusenergiesduringaerobicstage.ThepositionofaddingexternalcarbonnutrientshasnearlynoinfluencetobehaviorsofPAOs.Itwasfoundthat
7、PAOscanre-uptakephosphateinthelateranaerobicstage,apossibleexplanationwasthatit’senergydemandderivedfromtheanaerobicdegradationoforganicsandutilizedtouptakephosphateformwater.Keywords:municipalwastewater;denitrificationandphosphorusremoval;phosphorusaccum
8、ulatingorganisms;anaerobicphosphorusuptake生物脱氮除磷研究的深入发展,促进了新型生物脱氮除磷工艺的研制与开发[1-2].张波,高廷耀等[3-5]研究了“厌氧-缺氧-好氧”脱氮除磷工艺的厌氧段和缺氧段倒置效应,并由此在常规AAO工艺的基础上开发出倒置AAO工艺,该工艺投资和能耗均有所降低.目前,倒置AAO工艺的研究和应用多以外排水的氮、磷达到一级B排放标准为主,若使工艺达到一级A排放标准