Implications_of_organic_carbon_in_the_deterioration_of_water_quality_in_reclaimed_water_distribution1

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1、waterresearch44(2010)5367e5375Availableatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/watresImplicationsoforganiccarboninthedeteriorationofwaterqualityinreclaimedwaterdistributionsystemsaabb,LaurenA.Weinrich,PatrickK.Jjemba,EugenioGiraldo,MarkW.LeChevallier*aAmericanWater,

2、213CarriageLane,Delran,NJ08075,USAbAmericanWater,1025LaurelOakRd.,P.O.Box1770,Voorhees,NJ08043,USAarticleinfoabstractArticlehistory:ChangesinwaterqualityinreclaimedwaterdistributionsystemsareamajorconcernReceived10March2010especiallywhenconsideringthepotentialforgrowthofpathogenicmicrobes

3、.AsurveyofReceivedinrevisedform21wastewaterprocessconfigurationsconfirmedthehighqualityeffluentproducedusing10June2010membranebioreactor(MBR)technology,butsuggeststhatothertechnologiescanbeAccepted14June2010operatedtoproducesimilarquality.Datafromanintensivetwelve-monthsamplingAvailableonlin

4、e22June2010campaigninfourreclaimedwaterutilitiesrevealedtheimportanttrendsforvariousorganiccarbonparametersincludingtotalorganiccarbon(TOC),biodegradabledissolvedKeywords:organiccarbon(BDOC),andassimilableorganiccarbon(AOC).Ofthefourutilities,twoAOCwereconventionalwastewatertreatmentwitho

5、penreservoirstorageandtwoemployedBDOCMBRtechnologywithadditionaltreatmentincludingUV,ozone,and/orchlorinedisinfec-MBRtion.VeryhighBDOCconcentrationsoccurredinconventionalsystems,accountingforupDisinfectionto50%oftheTOCloadingintothesystem.BDOCconcentrationsintwoconventionalBiologicalstabi

6、lityplantsaveraged1.4and6.3mg/LandMBRplantsaveragedlessthan0.6mg/LBDOC.WastewaterAlthoughAOCshowedwidevariations,rangingfrom100to2000mg/L,theAOCconcen-trationsintheconventionalplantsweretypically3e10timeshigherthanintheMBRsystems.Pipe-loopstudiesdesignedtounderstandtheimpactofdisinfection

7、onthemicrobiologyofreclaimedwaterinthedistributionsystemrevealedthatchlorinationwillincreasethelevelofbiodegradableorganicmatter,therebyincreasingthepotentialformicrobialgrowthinthepipenetwork.Thisstudyconcludesthatbiodegradableorganiccarbonisanimportantfactorinthem