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    Water Quality Analysis of Reverse Osmosis Desalination Brine

    2012-10-21 16:54:43HuHaiyanZhouLin
    卷宗 2012年11期

    Hu Haiyan Zhou Lin

    Abstract:Seawaterdesalinationdevelopsfastasasignificantmethodtosolvetheglobalwaterresourcecrisis.Buttherearerarereportaboutthequalityofconcentratedseawater.Inthispaper,manyparametersofseawaterdesalinationwaterandoriginalseawaterareanalyzed.thedatawegotmaybesomethingusefulforthewaterenvironmentmanagementandscientificstudy.

    Keywords:Seawaterdesalination;concentratedseawater;waterqualityanalysis

    Introduction

    Desalinationisanadvancednewtechnologyofcreatingwaterandsavingwaterwhichisparticularlyappliedtotheislandenvironment.IthasbeenextendedandappliedtotheworldandChinascoastalareaswidelybecausethatitcanalleviatethelackoffreshwaterresourceseffectively.Bytheendof2008,thewaterproductioncapacityofthedesalinationprojectsbuiltinChinareached190,000tonsperday.Andthewaterproductivityrosebyarateof15%-25%peryear.Thesalinityoftheconcentratedseawatergeneratedduringtheoperatingofthedesalinationprojectsishigh.Andtheconcentratedseawatercontains chemicalagentandreactionproductsaddedinthehandlingprocess.Itwillcauseseriousimpactontheenvironmentifwedoemissionwithoutdisposing.Atthesametime,itwillbeawasteofhighconcentratedchemicalresources.Aimingatthereverseosmosisdesalinationtechnologywhichismostwidelyusedinourcountry,inthispaperwetaketheconcentratedseawaterdischargedfromthereverseosmosisdesalinationastheresearchobject,analyzethemainchemicalparameters,andsumupthephysicalandchemicalpropertiesaswellasthereasonscausingitscharacteristics.Theresultswillhaveimportantreferencesignificanceforthehealthydevelopmentofthedesalinationindustry.

    1Materialsandmethods

    1.1Theoriginalseawaterandconcentratedseawateroftheexperiment

    Inthisexperiment,weuseconcentratedseawaterofdesalinationplantofDaishancounty,Zhoushancity.Theoriginalseawaterisfromtheseaareanearthedesalinationplant.

    1.2Theanalysismethodoftheexperiment

    Asfortheanalysismethod,wetakethespecificationofmarinemonitoringGB17378.4-2007asareference.

    2.Theresultandanalysisoftheexperiment

    AccordingtotheseawateranalysisofPart4ofspecificationofmarinemonitoringGB17378.4-2007,wemakedataanalysisanderrorcorrectionof20seawatersamplesoforiginalseawaterandconcentratedseawaterandthengettheaverageoftheparametersinTab.1.

    ThedataoftheoriginalseawaterandconcentratedseawaterobtainedbyPHnotationisshowninTable1.ItcanbeseenthatthePHoftheconcentratedseawaterafterdesalinationdoesntchangemuchcomparedwiththePHofconcentratedseawaterbeforedesalination.Itsslightlylower.ThedataoftheoriginalseawaterandconcentratedseawaterobtainedbyiodometryisalsoshowninTable1.Thedataprovesthattheoxygencontentdissolvedinthewaterthroughthedesalinationisslightlyimproved.ThepossiblereasonwasthatoxygenwentintotheconcentratedseawaterduringtheprocessoftransportationbecausethatIfoundthattheconcentratedseawaterwasexposedagainintheair,ratherthaninaclosedpipelinewhengettingwaterfromthedesalinationplantinDaishan.AscanbeseenfromthedatainTable1,Thesalinity,Ca,MgandSO42-inconcentratedseawaterareabouttwiceofthemintheoriginalseawater,whichexplainsthatthesematerialsarenotremovedfromtheprocessofdesalination.Thedrinkingwaterdoesntcontaintheabovematerialssubstantiallyafterthedesalting.Andtherateofdesalinatedwaterandconcentratedseawateris1:1.Sonaturallythematerialsintheconcentratedseawaterwillbetwicethecontentsintheoriginalseawater.Therefore,theconcentratedseawatercontainshighconcentratedCa,Mg,andSO42-.ComparedwiththeCOD、PO43-andNO2- intheoriginalseawater,thecontentsofCOD、PO43-andNO2-intheconcentratedseawaterdecreasesignificantly.Thedeclineoftheabovedatacanprovethatthedesalinationremovesmostofthecreaturesandmicrobes.Therefore,thenutrientsaltsintheconcentratedseawateraremuchlowerthanthenutrientsaltsintheoriginalseawater.FromthedatainTable1,wecanclearlyseethatthematerialsofHg,AsandPbarenottested,whichprovesthatthedesalinationrecoversthispartofheavymetalelements.Itreflectsthatthedesalinationcangreatlyreducethecontentofheavymetalsintheoceanfromtheside.

    3.Prospect

    Thefactorsthataffectthenatureofstrongbrineincludethequalityofthefeedwater,desalinationprocess,therecoveryrate,chemicaladditivesusedinpre-processingandpost-processing.Thecompositionofthestrongbrineismainlyaffectedbytwoparts.Oneisthehighconcentratedsaltobtainedbytheconcentrationoffeedwaterthroughdesalinationprocess.Theotheristheinfluenceofthechemicalsaddedinthepretreatmentprocesstothemembranedesalination(mainlythereverseosmosis).Thepretreatmentofseawaterincludestheoperationofdisinfection,flocculation,pHadjusting,addingtheantifoulingagentandsoon.Thedistillationdesalinationusuallyneedstoaddedacidorscaleinhibitionagenttopreventfoulinginthedesalinationprocess.ItalsorequiresaddingbasetoadjustthevalueofpH.Thechlorocidebiologyisalsorequiredtobeadded.Thesechemicalsandthehighconcentratedsaltoftendischargetogetherwiththestrongbrine,whichmayhavenegativeimpactontheenvironmentoftheemissionwaterareas.

    Butthemainpropertyofthestrongbrineisnotdecidedbythechemicalsaddedintheprocessbecausetheconcentrationoftheaddedchemicalsisrelativelylow(generallylessthan10mg/L).Thenatureofthestrongbrineismainlydecidedbythecompositionexistedintherawwater.Whentheconcentratedrecoveryofthestrongbrineis50%,theconcentrationofthestrongbrinedischargedfromthereverseosmosisdesalinationistwicetheconcentrationofthenaturalseawater.Whenthestrongbrineofthedistillationdesalinationdischargestogetherwiththerefrigeratedseawater,theconcentrationoftheemissionwaterisapproximate10%-15%higherthantheconcentrationoftheseawater.

    Acknowlegements

    Thisworkwassupportedby2010s“StudyontheproductionofMFFwithdesalinationbrineandoptimizationofitscraft”(No.2010C33055)fromProjectofZhejiangScienceandTecnologyBureau,and2009s“DesalinationwithCarbonnanotube”fromProjectofZhejiangOceanUniversity(No.21105030609).

    References

    [1]LiuBingwei,LiuWeijie,HuWenpei.Thermalpowerplantdesalinationtechnologyeconomicanalysisandselectionofindustrialsafetyandenvironmentalprotection.2010(2):24-26.

    [2]ZhouZhenjue,HemiToyo,YangL,shouldbethedoor,HuHaiyan,GaoPeng,DengYibingZhoushanarea.Theapplicationofseawaterdesalinationtechnology.Thestatusofwatertreatmenttechnology.2010(2):15-18.

    [3]ZhangGuohui.SeawaterdesalinationindustrializationtodevelopthecurrentsituationandCountermeasuresofconstructiontechnology.2010(1):59-60.

    [4]Fenghou-jun,XieYuChun-gang.Chinadesalinationtechnologyresearchstatusandprospectofchemicalindustryandengineering.2010(2):104-108.

    [5]WangShichangseawaterdesalinationanditsroleinsustainabledevelopmentofchemicalindustryandengineering.2010(2):96-102.

    [6]YuRuixia,WangYue,WangShichang.Seawaterdesalinationbrinedisposalandtreatmenttechnologyof.2005(6):-1-3.

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