骆碧君1, 刘志强1, 郑 毅1,2, 李振中1, 韩 丹1(1.天津大学环境科学与工程学院,天津300072;2.天津金融城开发有限公司,天津300040) : 通过在实验室搭建小型管网,模拟了自来水及海水淡化水在已有市政管网中的输配过程,并选取pH、碱度、Langelier饱和指数和Ryznar指数作为控制指标来评价其化学稳定性。结果表明,海水淡化水的碱度极低,具有不饱和性(Langelier饱和指数为-3.25)和强腐蚀倾向(Ryznar指数为13.92),即化学不稳定性,进入既有管网后易溶解原先积存的管垢,并加速金属管道内壁腐蚀。 : 海水淡化水; 供水管网; 管垢; 腐蚀:TU991 :C :1000-4602(2009)23-0057-04WaterQualityChangeofDesalinatedSeawaterinExistingWaterDistributionSystemsLUOBi-jun1, LIUZhi-qiang1, ZHENGYi1,2, LIZhen-zhong1, HANDan1(1.SchoolofEnvironmentalScienceandTechnology,TianjinUniversity,Tianjin300072,China;2.TianjinFinanceCityDevelopmentCo.Ltd.,Tianjin300040,China) Abstract: Inthelaboratory,asmall-scalepipenetworkwassetuptosimulatethedistributionprocessoftapwateranddesalinatedseawaterinexistingmunicipalpipenetworks.ThepH,alkalinity,LangeliersaturationindexandRyznarindexwerechosenastheevaluationindexesofchemicalinstability.Theresultsshowthatthedesalinatedseawaterischemicallyinstable,sinceitsalkalinityismuchlowerthanthetapewater,anditisnon-saturated(Langeliersaturationindexof-3.25)andstrongcorrosive(Ryznarindexof13.92).Theaccumulatedpipescaleiseasilydissolvedandthecorrosionoftheinnerpipewallisacceleratedwhenthedesalinatedseawaterenterstheexistingwaterdistributionsystems. Keywords: desalinatedseawater; waterdistributionsystem; pipescale; corrosion :(2008ZX07317-005); (2006BAJ03A10-08) ,,,,,“”[1],PE。,,,,,。,,,,,·57·第25卷 第23期2009年12月 中国给水排水CHINAWATERWASTEWATER Vol.25No.23Dec.2009。1 管网输配水质化学稳定性研究进展,1996,51.67%、23.85%[2]。,,[3~5]。,,、、[6、7],,[8]。,pH、、、Ca2+、Mg2+[9、10]。,LangerlierRyznar[11](,Lar-son)。2 淡化水水质分析[12],,,,“”(、、、),。,,、、、、、、()。,pH、、LangelierRyznar。3 输配试验3.1 ,(1)。,,,,,。,,。600L,50mm。1 Fig.1 Schematicdiagramofgalvanizedpipenetwork3.2 ,48h。,0.6m/s;。,,0.61.1m/s,0.05mg/L。()、pH(pH)、(HACH2100AN)、()、(HACH)、(HACH46700-00)、(EDTA)、()、()、()。3.3 3.3.1 16.717.0℃,pH7.737.32,1.410.83NTU,45067μS/cm,126.44.50mg/L,0.79mg/L,0.5mg/L,185.72.15mg/L,0.0206mg/L,19715mg/L。,LangelierRyznar-0.03∈[-1,1]7.33∈[7.0,7.5],CaCO3,,;LangelierRyznar·58·第25卷 第23期 中国给水排水 (-1)13.92(9.0),,,“”。3.3.2 2、。,。2 Fig.2 Qualitychangesofrawwaterindistributionprocess,,,1.41NTU0.0206mg/L。,1.58NTU0.0210mg/L;,,。,0.83NTU,,,1~2,“”。2,,,CaCO3,。0.01mg/L、、、“”。,。,,1.1m/s0.6m/s,。0.6m/s,,1.1m/s,,。0.6m/s,,(),。4 结论① ,。,,“”。② ,。③ ,,PE;,,。:[1] .·59·骆碧君,等:海水淡化水在既有管网中的水质变化研究第25卷 第23期[J].,2008,24(12):90-92.[2] ,,.[J].,2004,31(1):60-63,70.[3] ,,,.[J].,2008,41(2):137-141.[4] ZhangZ,StoutJE,YuVL,etal.Effectofpipecorro-sionscalesonchlorinedioxide[J].WaterRes,2008,42(1-2):129-136.[5] EdwardsM.Controllingcorrosionindrinkingwaterdis-tributionsystems:agrandchallengeforthe21stcentury[J].WaterSciTechnol,2004,49(2):1-8.[6] SarinP,SnoeyinkVL,BebeebJ,etal.Physical-chemi-calcharacteristicsofcorrosionscalesinoldironpipes[J].WaterRes,2001,35(12):2961-2969.[7] LinJP,EllawayM,AdrienR,etal.Studyofcorrosionmaterialsaccumulatedontheinnerwallofsteelwaterpipe[J].CorrosSci,2001,43(11):2065-2081.[8] ,,,.[J].,2006,27(6):1150-1154.[9] ,,.[J].,2008,(3):50-51.[10] ,,.[J].,2009,25(13):98-101.[11] ,,,.[J].,2006,22(14):10-13.[12] LuoBijun,LiangBaoshuang,DongGuofeng,etal.Studyonwaterqualitychemicalstabilityofdesalinatedseawa-terinmunicipalwatersupplysystems[A].2009Inter-nationalConferenceonEnvironmentalScienceandInfor-mationApplicationTechnology(ESIAT2009)[C].USA:IEEECPS,2009.:(022)27400830E-mail:luobj0222@163.com:2009-07-10(上接第56页),;,,,。,,0.1mg/L,,,。3 结论3,。,,,,HPC400~800CFU/mL,。,,,。:[1] ,,,.[J].,2005,31(10):1-6.[2] VanderKooijD.Biologicalstability:amultidimensionalqualityaspectoftreatedwater[J].Water,Air,SoilPol-lut,2000,123(1-4):25-34.[3] SrinivasanS,HarringtonGW.Biostabilityanalysisfordrinkingwaterdistributionsystems[J].WaterRes,2007,41(10):2127-2138.[4] ,,,.AOC、MAP[J].,2006,22(7):50-53.[5] LeChevallierMW,WelchNJ,SmithDB.Full-scalestudiesoffactorsrelatedtocoliformregrowthindrinkingwater[J].ApplEnvironMicrobiol,1996,62(7):2201-2211.:15333258307E-mail:jiangdl@tsinghua.org.cn:2009-07-16·60·第25卷 第23期 中国给水排水