不同pH下鸟粪石MAP法目标产物的分析与表征

29420107ENVIRONMENTALCHEMISTRYVo.l29,No.4July2010200951.*(863)(2006AA06Z320);(50978013);(PHR20100508PHR201008372);(KM200910016009);2009().**.pH(MAP)*王崇臣郝晓地**王鹏兰荔(,,,100044)XRD,IR,TGApHMAP.XRDIR,.,(9010%)pH710)910,,(9010%)pH710)715.XRD,IR,TGA,,1(MgNH4PO4#6H2O,MAP),(MAP),[1)7].X(XRD)(IR)(TGA)pHMAP,,pHCa2+.1111A:Ñ015L510mmolNaH2PO4#2H2O;Ò015L610mmolMgSO4#7H2O1510mmolNH4C.lÒ115L,Ñ,.MgBNBP112B3B1..pH=710,NaOH(NaOH,1mol#l-1NaOH)015pH,pH,710)1110.(25e),.1h,.,,,().,(25e).B:,A.:C(Ca2+)=2117mmol#l-1,C(Mg2+)=1134mmol#l-1.112(9910%,Alfa-Aesar).RigakuD/maxÓAX(CuKA,K=115406ÜA,,10b,80b,3b#min-1).Spectrum100FT-IR4000)400cm-1(KBr).ZRY-1P,10e#min-1600e,,A-Al2O3.IRISAdvantageICP-AES,DX-120Mg2+Ca2+NH+4-N.760292211XRD,XRD,1.1,pH715)910,pH710)815,(001)(002)2H20185b33127b,MgNH4PO4#6H2O(PDF#15-0762),MgNH4PO4#6H2O.,,pH915,,Mg3(PO4)2#4H2O,Mg(OH)2(001)(002),MgNH4PO4#6H2O,Mg3(PO4)2#4H2OMg(OH)2,LeCorre[8]XRD.,,pH=910,Mg3(PO4)2Mg(OH)2Ca3(PO4)2(Ksp=211@10-33)CaHPO4(Ksp=118@10-7)(001)(002).1(A)(B)pHXRD11,21pH=715,31pH=810,41pH=815,51pH=910,61pH=915,71pH=1010,81pH=1015,91pH=1110,101pH=1115Fig11XRDpatternofprecipitatesobtainedunderdifferentpHinpurewater(A)andtapwatersystem(B)1,,pH1015,(001)(002),,.2122pH.2(A)(B)pHIR11pH=715,21pH=1115Fig12IRspectrumofprecipitatesobtainedunderdifferentpHinpurewatersystem(A)andtapwatersystem(B)2,pH=715)1110pH=715)10104:pH(MAP)761455cm-1568cm-11000cm-11430cm-1NH+4[9],pH,,,.,NH+4(1500)1385cm-1),,,,,.213pHTGDTA,3,50e,[10].100e,600e,45%.Frost[11],42%,(7134%),(34165%),1mol,417mol,.,,,MAP.3TGDTAFig13TGandDTAplotofsomeselectedprecipitates214,,MAP[5].NPMg1B1B1,XRD,pH,PMg,Mg(OH)2(Ksp=511@10-12)Mg3(PO4)2(Ksp=110@10-24).NH+4(MgNH4PO4,CaNH4PO4).,N.(1):=n@Mm@100%(1),m;n;M.(1),9819%,(9910%).,4.4(%)pHFig14EffectofpHonthestruvitecontentsintheprecipitatie762294,pH7151015,,,90%pH715)910,pH1015,.pH,Ca2+.pH710715,9618%9517%.pH715,,pH=1010,1515%.pH1015,.215,pH,,50112%96127%(5),MAP.pH,,,AltinbasM[12].pHNH+4-NNH3[13],,pH.pH.pH,,pH.5pHFig15TheP-removalrateandstruvitecontentintheprecipitatesunderdifferentpHinpurewatersystem3pH,pH,pH,.90%pH715)910,Ca2+90%pH710)715.Ca2+Mg2+,pH,Ca,.[1]PastorL,ManginD,BaratRetal1,APilot-scaleStudyofStruvitePrecipitationinaStirredTankReactor:ConditionsInfluencingtheProcess[J]1Bioresour.Technol.,2008,99(14)B6285)6291[2]RonteltapM,MaurerM,GujerW,StruvitePrecipitationThermodynamicsinSource-SeparatedUrine[J]1WaterRes.,2007,41B977)984[3]WilsenachJ,SchuurbiersC,VanLoosdrechtM,PhosphateandPotassiumRecoveryfromSourceSeparatedUrinethroughStruvitePrecip-itation[J]1WaterRes1,2007,41B458)466[4]HaoXD,vanLoosdrechtMCM,Mode-lBasedEvaluationofStruviteRecoveryfromP-releasedSupernatantinaBNRProcess[J]1WaterSci1&Technol1,2006,53(3)B191)198[5]HaoXD,WangCC,LanLetal1,StruviteFormation,AnalyticalMethodsandEffectsofpHandCa2+[J]1WaterSci1&Tech1,2008,58(8)B1687)1692[6]AbbonaF,BoistelleR,LundagerH,CrystallizationofTwoMagnesiumPhosphates,StruviteandNewberyite:EffectofpHandConcentra-tion[J]1J.Cryst.Growth,1982,57B6)14[7],,,MAP[J]1,2009,30(4)B185)190[8]LeCorreK,Valsam-iJonesE,HobbsPetal1,ImpactofCalciumonStruviteCrystalSize,ShapeandPurity[J]1J1Cryst1Growth,4:pH(MAP)7632005,283(3)4)B514)522[9]BanksE,ChianelliR,KorensteinR,CrystalChemistryofStruviteAnalogsoftheTypeMgMPO416H2O(M=Potassium(1+),Rubidium(1+),Cesium(1+),Thallium(1+),Ammonium(1+)[J]1Inorg1Chem1,1975,14B1634)1639[10]RensburgPV,MusvotoEV,WentzelMCetal1,ModellingMultipleMineralPrecipitationinAnaerobicDigesterLiquor[J]1WaterResearch,2003,37(13)B3087)3097[11]FrostRL,WeierML,KristyLErickson,ThermalDecompositionofStruviteImplicationsfortheDecompositionofKidneyStones[J]1JournalofThermalAnalysisandCalorimetry,2004,76B1025)1033[12]AltinbasM,YanginCOzturkIStruvitePrecipitationfromAnaerobicallyTreatedMunicipalandLandfillWastewaters[J]1WaterScienceandTechnology,2002,46(9)B271)278[13]AndradeA,SchuilingR,TheChemistryofStruviteCrystallization[J]1MineralJournal,2001,23(5)6)B37)46THEANALYSISANDCHARACTERIZATIONOFPRECIPITATESOBTAINEDFROMSTRUVITE(MAP)PRECIPITATIONWANGChong-chenHAOXiao-diWANGPengLANLi(KeyLaboratoryofUrbanStormwaterSystemandWaterEnvironment,BeijingUniversityofCivilEngineeringandArchitecture,Beijing,100044,China)ABSTRACTTheprecipitatesharvestedfromMAPmethodunderdifferentpHconditionswerecharacterizedandanalyzedbyXRD,IR,TGAandelementalanalysis1TheresultsrevealthatXRDandIRcanqualitativelydeterminethepresenceofstruviteintheprecipitates,whiletheelementalanalysismethodcanquantitativelydefinetheexactcontentofstruvite1AndtheelementalanalysisresultsshowthattheoptimalpHrangeforhavinghighstruvitecontent(9010%)wasrespectivelybetween715)910underpurewatersystemand710)715undertapwatersystem1Keywords:XRD,IR,TGA,elementanalysis,struvite.