反渗透浓水除硬方法及其对减压膜蒸馏过程的影响刘东

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HardnessremovalofreverseosmosisdrainedwastewateranditseffectonvacuummembranedistillationprocessLiuDong,WuChunrui,LüXiaolong(KeyLaboratoryofHollowFiberMembraneMaterialsandMembraneProcess,MinistryofEducation,InstituteofBiologicalandChemicalEngineering,TianjinPolytechnicUniversity,Tianjin300160,China),,(,,300160)[](RO)(VMD)。RO、VMDRO。:-,RO96%。RO,VMD25.8kg/(m2·h),RO10,14.8kg/(m2·h);ROVMD,22.3kg/(m2·h),2.510.2kg/(m2·h)。[];RO;;[]TQ028.8[]A[]1005-829X(2010)05-0023-04Abstract:Novelhydrophobicpolyvinylidenefluoride(PVDF)hollowfibermembranehasbeenusedfortreatingreverseosmosis(RO)drainedwastewaterfromachemicalplantbyvacuummembranedistillation(VMD)method.Theeffectsofthehardnessremovingmethod,andthedosageofthehardnessremovingagentonthefluxdeclineofVMDROdrainedwastewatertreatmentarestudiedemphatically.Thehardnessremovalratereaches96%withoptimizedhardnessremovalagentsaddedinthewastewater.Whenthewastewateristreatedbyhardnessremovingmethod,theinitialfluxofVMDprocessreaches25.8kg/(m2·h)andkeepsat14.8kg/(m2·h)afterthewaterwasconcentrated10times.DuringtheROdrainedwastewaternotbeingtreatedbyhardnessremovingmethod,theinitialfluxofVMDprocessis22.3kg/(m2·h),andquicklydeclinedto10.2kg/(m2·h)whenitisconcentratedto2.5times.Keywords:vacuummembranedistillation;reverseosmosisdrainedwastewater;polyvinylidenefluoride;hydropho-bichollowfibermembrane,(RO)、。50%,〔1〕。RO、、,。(MD)、100%,、,,RO〔2-3〕。(PVDF),(VMD)RO,RO,90%〔4-6〕。ROVMD。VMD,RO,。、RO,ROVMD,[](2006BAB03A06);863(2008AA06Z303);(09JCZDJC26300)30520105IndustrialWaterTreatmentVol.30No.5May,201023——2010-05,30(5)VMD,VMD。11.1PVDF(),0.8mm,1.1mm,0.160μm,85%。90mm,100。RO,6000μS/cm,1011mg/L,。NaOH、CaO、Na2CO3。FN2004N,;pHS-25pH,;JJ-4,。1.2RO1.2.1,ROCO32-、OH-,ROCa2+、Mg2+。1.2.2,RO200mL,,2min,5min,10min。pHS-25pHpH,,250mL2h。,EDTA(CaCO3)、(Ca2+)(Mg2+)。1.3VMDROVMD1,、PVDF。,,,;,。,,,,。、,,,(1)VMD。F=QA·t(1):F———VMD,kg/(m2·h);Q———,kg;A———,m2;t———,h。22.1RO2.1.1NaOH,RONaOH,NaOHRO。pH、、RONaOH,2。2,NaOH,ROpH。NaOH200mg/L,NaOH,450mg/L,pH9.3;NaOH,。NaOH850mg/L,;NaOH1400mg/L,pH11.4,26.50mg/L,12.05mg/L,3.53mg/L,、97%。RO2:(1)、24——2010-05,30(5),、;(2)、、、。,NaOH,pH<10.3(),NaOH,CaCO3,、()CO32-,MgCO3,;NaOH1400mg/L,Mg(OH)2,OH-Mg2+,。pH>11.4(NaOH1400mg/L),、,NaOH,、。2.1.2--RO,CaORO,3。3,CaO400mg/L1600mg/L,ROpH8.012.0。CaO<700mg/L,CaO,;CaO,CaO。CaO,CaO800mg/L,。CaO1000mg/L,6.78mg/L,96%,264.62mg/L,385.91mg/L。,,。,,Na2CO3、。CaO1000mg/LNa2CO3,Na2CO3100mg/L1400mg/L,Na2CO3,4。4,Na2CO3,,。Na2CO31200mg/L,96%。5.09mg/L,4.30mg/L,17.57mg/L。,NaOHCaO-Na2CO3,RO。CaO-Na2CO3,,,,-RO。2.2VMDRO-RO,70℃,0.66m/s,0.08MPa,10LROROVMD,5、6。5、6,RO,VMD22.3kg/(m2·h),2.5(10L4L),10.2kg/(m2·h);1011mg/L1305mg/L。RO,VMD25.8kg/(m2·h),10(10L1L),14.8kg/(m2·h);10mg/L46mg/L。RO,、,:25——2010-05,30(5),;2.51305mg/L,,、。RO,VMD10,,VMD。3-RO。RO1400mg/LNaOH,1000mg/LCaO1200mg/LNa2CO3,RO96%。VMDRO,22.3kg/(m2·h),2.510.2kg/(m2·h);RO,VMD25.8kg/(m2·h),RO10,14.8kg/(m2·h)。[][1],.[J].,2005,36(3):58-59.[2].[J].,2003,23(4):67-79.[3]EI-BourawiMS,DingZ,MaR,etal.Aframeworkforbetterun-derstandingmembranedistillationseparationprocess[J].J.Membr.Sci.,2006,285(1):4-29.[4],,,.PVDF[J].,2008,39(6):922-925.[5],,,.PVDF[J].,2008,39(12):2018-2021.[6],,.:[J].,2009,29(1):83-89.《》302010《》30。《》3030。30《》。、,《》30,2010、、,、、,《》30,。:(1)《》30。(2)30。(3)。。2010730。:iwt@iwt.cn(“30”)2010129!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!![](1983—),2009,,。:13764640667,E-mail:liudong76846204@163.com。[]2009-12-02()26——

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