Nutrient removal in an A2O一MBR reactor with sludge reduction 毕业设计外文翻译原文

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1、NutrientremovalinanA2O一MBRreactorwithsludgereductionJ.RajeshBanu,DoI

2、08Receivedinrevisedform11December2008Accepted15December2008Availableonline25February2009Keywords:A2OreactorMBRNutrientremovalTMPABSTRACTInthepresentstudy,anadvancedsewagetreatmentprocesshasbeendevelopedbyincorporatingexcesssludgereductionandphosphorousrecover

3、yinanA2O-MBRprocess.TheA2O-MBRreactorwasoperatedatafluxof77LMHoveraperiodof270days.Thedesignedfluxwasincreasedstepwiseoveraperiodoftwoweeks.ThereactorwasoperatedattwodifferentMLSSrange.ThermochemicaldigestionofsludgewascarriedoutatafixedpH(11)andtemperature(7

4、5℃)for25%CODsolubilisation.Thereleasedpbospborouswasrecoveredbyprecipitationprocessandtheorganicswassentbacktoanoxictank.ThesludgedigestiondidnothaveanyimpactonCODandTPremovalefficiencyofthereactor.Duringthe270daysofreactoroperation,theMBRmaintainedrelatively

5、constanttransmembranepressure.Theresultsbasedonthestudyindicatedthattheproposedprocessconfigurationhaspotentialtoreducetheexcesssludgeproductionaswellasitdidn'tdetonatedthetreatedwaterquality.@2008ElsevierLtd.Allrightsreserved.1.IntroductionExcesssludgereduct

6、ionandnutrientsremovalarethetwoimportantproblemsassociatedwithwastewatertreatmentplant.MBRprocesshasbeenknownasaprocesswithrelativelyhighdecayrateandlesssludgeproductionduetomuchlongersludgeageinthereactor(Wenetal.,2004).SludgeproductioninMBRisreducedby28-68%

7、,dependingonthesludgeageused(Xiaetal.,2008).However,minimizingthesludgeproductionbyincreasingsludgeageislimitedduetothepotentialadverseeffectofhighMLSSconcentrationsonmembrane(Yoonetal.,2004).Thisprob-lemcanbesolvedbyintroducingsludgedisintegrationtechniquein

8、MBR(Youngetal.,2007).Sludgedisintegrationtechniqueshavebeenreportedtoenhancethebiodegradabilityofexcesssludge(VlyssidesandKarlis,2004).Inoverall,thebasisforsludgereductionprocessesiseffec