污泥龄对A-A-O工艺反硝化除磷的影响

污泥龄对A�A�O工艺反硝化除磷的影响徐伟锋1,陈银广2,张芳2,顾国维2(1�上海电力学院环境工程系,上海�200090;2�同济大学污染控制与资源化研究国家重点实验室,上海�200092)摘要:以实际生活污水培养驯化污泥的小试规模A�A�O工艺为研究对象,进行了污泥龄(SRT)为8、10、12和15d时对反硝化除磷的影响研究.结果表明,随着污泥龄的延长,反硝化除磷对系统除磷所起的作用越大,反硝化聚磷菌缺氧利用单位PHAs的反硝化数量和吸磷量也迅速增加,聚磷菌好氧利用单位PHAs的吸磷量并没有受到影响,以SRT为12d时反硝化除磷和系统脱氮除磷效果为最好.结果还表明,去除单位氮所需COD数量随污泥龄的延长呈减少趋势,而去除单位磷所需COD数量呈增大趋势.对于我国典型的城市污水而言,SRT为12d和15d时去除单位氮和磷所需的外碳源数量较8d时要低,从而使反硝化除磷作用可真正地达到节省碳源和能源的目的.关键词:生物脱氮除磷;反硝化除磷;污泥龄;实际生活污水中图分类号:X703.1�文献标识码:A�文章编号:0250�3301(2007)08�1693�04收稿日期:2006�09�18;修订日期:2006�10�25基金项目:国家自然科学基金重点项目(50138010);上海市重点学科建设项目(P1304)作者简介:徐伟锋(1978~),男,博士,讲师,主要研究方向为水污染控制,E�mail:steve78107@163.comEffectofSRTonDenitrifyingPhosphorusRemovalinA�A�OProcessXUWei�feng1,CHENYin�guang2,ZHANGFang2,GUGuo�wei2(1�DepartmentofEnvironmentalEngineering,ShanghaiUniversityofElectricPower,Shanghai200090,China;2�StateKeyLaboratoryofPollutionControlandResourceReuse,TongjiUniversity,Shanghai200092,China)Abstract:Basedonalaboratory�scaleanaerobic�anoxic�oxicprocessacclimatedwithmunicipalwastewater,effectofSRTondenitrifyingphosphorusremovaloccurredinthesystemwasinvestigated.Theresultsindicatethatthecontributionofanoxicdenitrifyingphosphorusremovaltototalphosphorusremovalbecomeslargerwithprolongingthesludgeretentiontime.DNPAOs�denitrificationandPuptakecapacitiesperanoxicPHAsutilizedarequicklyincreased,whilePAOs�PuptakecapacityperaerobicPHAsutilizedisrarelyinfluencedbySRT.WhenSRTissetat12days,anoxicphosphorusuptakeefficiencyandbiologicalnutrientremovalefficiencyarebest.TheresultsalsoshowthattheCODamountrequiredforremovingpernitrogendecreasesandforremovingperphosphorusincreaseswithprolongingthesludgeretentiontime.Forthenationaltypicalmunicipalwastewater,theCODamountrequiredforremovingpernitrogenandphosphorusunderSRTof12and15daysislessthanthatofunderSRTof8days,whichindicatesthatanoxicdenitrifyingphosphorusremovalcanreallydecreasethedemandofcarbonandenergysources.Keywords:biologicalnutrientremoval;denitrifyingphosphorusremoval;sludgeretentiontime;municipalwastewater��近年来,国内