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44820098IronandSteelVol.44,No.8August20091,2,1,3,2(1.,100083;2.,014010;3.,014010):,,,,56.85mg/(cm2)01834mm/a35.02mg/(cm2)0.136mm/a,;,184.59mg/(cm2),,0.158mm/aXRD,Mg2+,MgFe2O4,:;;;;:X756,X123:A:04492749X(2009)0820097206ExperimentalStudyonWaterQualityStabilizationUsingtheLowFrequencyElectromagneticTreatmentofReclaimedWaterCHIJin2bao1,ZHAOMin2,CANGDa2qiang1,ZHANGXue2feng3,CHANGRui2qing2(1.DepartmentofEnvironmentalEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China;2.TechnologyCenter,BaotouIron&SteelGroup,Baotou014010,NeiMonggol,China;3.SchoolofMathematicsandPhysics,InnerMongoliaUniversityofScienceandTechnology,Baotou014010,NeiMonggol,China)Abstract:Accordingtoscalingandcorrosionproblemsduringoperationprocessofcirculatingcoolingwater,awaterqualitystabilizationexperimentwasconductedontreatmentreclaimedwaterwithlowfrequencygradientelectromag2neticfield.Theeffectsofelectromagnetictreatmentonscaleandcorrosioninhibitionweremainlyinvestigated.Theexperimentalresultsshowthatscalingandcorrosionproblemsonnon2heat2transfersurfacecouldbecontrolledsig2nificantly.Thefoulingdepositionrateandthecorrosionratewerereducedto35.02mg/(cm2month)and0.136mm/aunderdynamicsimulationtestfrom56.85mg/(cm2month)and0.834mm/aunderstatictestrespectively,andwerebothkeepingdecreasing.Butscalingproblemonheat2transfersurfacewasserious,thefoulingdepositionratewas184.59mg/(cm2month),butthecorrosionratecouldbecontrolledsignificantly,whichwas0.158mm/a.ThroughXRD(X2RayDiffraction)analysis,itwasfoundthatthemassiveMg2+inreclaimedwatercouldin2hibitthescaleinhibitionofelectromagnetictreatment,whilepromotingtheformationofcompactMgFe2O4protec2tivefilmonironsurfaceunderelectromagnetictreatment,whichisagainstcorrosion.Keywords:reclaimedwater;circulatingcoolingwater;magneticwatertreatment;scaleinhibition;corrosioninhibi2tion:(2007Z1009):(19812),,;E2mail:chijinbao@gmail.com;:2008207224,,,,,,[16],,,,,,4411.1,11Table1Waterqualityanalysisdatainexperimentmg/LpH7.988.15F-4.345.86(NTU)7.8111.13CODCr25.9062.16(CaCO3)364.77397.40(CaCO3)110.46148.57Ca2+67.1986.57Mg2+43.9549.93Cl-194.94255.66SO42-278.65375.2418.6427.56108614301.2,11,,400mm,,(1),Bac=250I0cos(2ft+)(1),Bac,10-4T;I0,A;f,Hz;,rad1.31.3.1L9(34),GB/T1817522000,,:(401);110r/min;GB20;72h;1.01Fig.1Experimentaldeviceandtreatmentprocess1.3.2,HG/T2160291,,:95;30;40;30;600L/h;GB20898:;360h;2.0,15,33,,,1.4:RCC2FA2004NJA12002101212S:S3400;ZEISSEVO50HV;PHILIPS2Pw1700,CuX22.1L9(34)22,,0.834mm/a,,0.834mm/a,0.834mm/a,2Table2TestresultsofoptimizingtheelectromagnetictreatmentparametersA(/104T)B(/Hz)C(/(ms-1))D(/%)/(mgcm-2-1)/(mma-1)11(250)1(25)1(0.472)1(0)55.960.840212(35)2(0.707)2(3)56.880.827313(45)3(0.943)3(6)55.790.79442(750)12356.960.7745223155.040.8066231257.120.76173(1250)13254.890.8608321356.850.8419332157.600.831K1168.63167.81169.93168.60K2169.12168.77171.44168.89K3169.34170.51165.72169.60R0.712.705.721.00:56.85K12.4622.4742.4422.478K22.3412.4752.4322.448K32.5322.3862.4612.409R0.1910.0880.0290.069:0.8342,,C3B1A1D1;,A2B3D3C2,,,,,,A2B3D1C22.2A2B3D1C2:96.197.4,30.132.6,38.141.2,30.332.7;579.7613.8L/h;372h;2.02.52.2.1(1)33,38.08mg/(cm2),99440.136mm/a,,,,,,,,,3Table3Dataanalysesoftheon2linetestpieces/g/g/g/g/(mgcm-2-1)/(mma-1)21.509422.072721.37060.004521.464722.030721.33380.004538.0838.080.1360.1362.2.244,184.59mg/(cm2),0.158mm/a,,,,,,,,,,,4Table4Dataanalysesoftheexperimentaltube/mm15.743/mm580.00G1/g539.2412G2/g567.0652G3/g537.6985V1/mL100.70V2/mL109.90/(mgcm-2-1)184.59/(mma-1)0.158/mm0.3372.2.322,30.402mm/a150.267mm/a,;,644.18mg/(cm2),1535.02mg/(cm2),,,62Fig.2Variationswithtimeofthecorrosionrateandthefoulingdepositionrateonthetestpiecesincollectingtank2.32.3.1,,3,,Fe,;,Fe,2.3.2XRD,XRD,44,(Mg0.064Ca0.936)CO3,MgFe2O4XRD,(Mg0.064Ca0.936)CO30018:(a);(b);(c);(d)3Fig.3SEMandEDXanalysesofthefouling4XRDFig.4XRDanalysisofthefouling100%,MgFe2O46,2014%,153611%,MgFe2O442114%,MgFe2O438.65%,2.4RSIPSI[7],5,N=1.0,,N,N2.0,,,,,5Table5Resultsofwaterqualityjudgmentt/N1.02.03.0RSI405.924.764.00PSI407.185.834.7510144,;,,XRD,Mg2+MgFe2O4,,3(1),2.0,,(2),,54.89mg/(cm2)0.761mm/a35.02mg/(cm2)0.136mm/a,(3),,184.59mg/(cm2);,0.158mm/a,:[1]ChibowskiE,HotyszL,SzczesA.TimeDependentChangesinZetaPotentialofFreshlyPrecipitatedCalciumCarbonate[J].ColloidsandSurfacesA:PhysicochemicalandEngineer2ingAspects,2003,222(123):41.[2],.[J].,2007,27(3):10.(HUANGJia2shun,YUANShan2qing.FrequencyConvertingDirectCurrentPulseElectromag2neticWaterTreatmentTechnology[J].IndustrialWaterTreatment,2007,27(3):10.)[3]BikulchyusG,RuchinskeneA,DeninisV.CorrosionBehav2iorofLow2CarbonSteelinTapWaterTreatedWithPermanentMagneticField[J].ZashchitaMetallov,2003,39(5):492.[4],,.[J].,2006,27(4):196.(LIUWei2guo,LIUJian2dong,ZHAOChen2long.Corrosion2PreventionMechanisminMag2neticTreatmentofWater[J].CorrosionandProtection,2006,27(4):196.)[5]LiM,QuJH,PengYZ.SterilizationofEscherichiaColiCellsbytheApplicationofPulsedMagneticField[J].JournalofEnvironmentalSciences,2004,16(2):348.[6],,,.[J].,2006,41(9):82.(ZHANGXue2feng,LIUGuan2yuan,CANGDa2qiang,etal.MechanismofHigh2Gradi