不同pH值条件下磷酸铵镁沉淀产物特性研究杨阳

　第34卷第6期　2011年6月合肥工业大学学报(自然科学版)JOURNALOFHEFEIUNIVERSITYOFTECHNOLOGYVol.34No.6　Jun.2011　　　:2010-05-26;:2010-07-14:(2008ZX07316-003):　(1985-),,,;(1969-),,,,,;(1951-),,,,.Doi:10.3969/j.issn.1003-5060.2011.06.026pH杨　阳,　崔康平,　孙世群,　孔殿超,　施帆君(,　230009)　:(MgNH4PO4·6H2O),pH9～9.5,pH(SEM)X(XRD-EDS),,pHN、P。:;pH;;:X703.1　　　:A　　　:1003-5060(2011)06-0910-05CharacterizationofmagnesiumammoniumphosphateprecipitationwithdifferentpHvaluesYANGYang,　CUIKang-ping,　SUNShi-qun,　KONGDian-chao,　SHIFan-jun(SchoolofResourcesandEnvironmentalEngineering,HefeiUniversityofTechnology,Hefei230009,China)Abstract:Thestruvite(MgNH4PO4·6H2O)generationexperimentswerecarriedoutbyusingthesimulantwastewaterinwhichthecarbonconcentrationwaslowbuttheammonia-nitrogenconcentra-tionwashigh.TheexperimentalresultsshowedthattheoptimalpHvaluerangeforthereactionwas9-9.5.ProductsgainedwithdifferentpHvalueswerecharacterizedbyscanningelectronmicroscopy-energydispersivespectrometer(SEM-EDS)andX-raydiffraction(XRD),andthepurityofthemwasdeterminedbyusingtheelementalanalyticalmethod.Thewater-solubleexperimentswerealsotakenfordeterminingtheeffectofpHvaluesonNandPleachingperformanceoftheproducts.Keywords:struvite;pHvalue;crystalform;acidicdissolution　　,[1-3],。,,,,[4-5]。,,,[6-7]。,NH4+Mg2+PO43-,MgNH4PO4·6H2O(MAP),,MAP[8]。,、,,,、,。,pH[9-10],pH;,,;[11],,N、P。1　1.1　:,pH(PHS-3C,),722E(),85-2(),(),(DZF-6030A,)。:NH4Cl,Na2HPO4·12H2O,MgCl2·6H2O,NaOH,。。1.2　1.2.1　鸟粪石的生成实验:Mg2++NH4++HPO42-+6H2O※MgNH4PO4·6H2O↑+H+(1)12.2287gNH4Cl,2L,。300mL,。pH(),n(N)∶n(P)∶n(Mg)=1∶1∶1Na2HPO4·12H2O(12.2801g),,NaOHHClpH,MgCl2·6H2O(6.9703g),pH,NaOH(),pH,NaOHHCl,pH。5min()。,。40℃48h,[12],。,N、P。1.2.2　产品水溶性实验(AlfaAesarCompa-ny,USA)pH2.0g()。500mL,,24hN、P。1.2.3　纯度分析实验,,[13]。(1),N、P、Mg1∶1∶1,,P、Mg,N,1molN1mol。:pH0.5g,,100mL,[14]ρ(N),(2):=nMm×100%(2)1.3　pH,,,XRDD/MAX2500VL/PCX,JSM-6490LV。2　2.1　pH,1。1,pH7.59,(pH=9,92.92%),ρ(pH=9,ρ50.57mg/L),pH99.5,,pH,(pH=11,72.04%),ρ。1pH9～9.5,[15]。pHpH、,,pH,。1　pH2.2　XRD,XRD,2,pHXRD3。911　第6期杨　阳,等:不同pH值条件下磷酸铵镁沉淀产物特性研究2　XRD　　pH10,2θ15.79°、20.85°、33.27°,,(PDF),MgNH4PO4·6H2O(PDF77-2303),MgNH4PO4·6H2O。pH=11,,,MgNH4PO4·6H2O,PDF,Mg3(PO4)2·4H2O(PDF0120428)(001)(002),Mg3(PO4)2·4H2O。,,Mg3(PO4)2·4H2O、、。3　pHXRD2.3　,4。pH9(4b),。pH=9(4c),,,(4a)()。pH=9,,。pH=9.5(4d),4c4　912　　　合肥工业大学学报(自然科学版)第34卷　。pH=10(4e),,,,pH=11(4f),,,MgNH4PO4·6H2O,3f,Mg3(PO4)2·4H2OMg(OH)2,[16]。XRD,2.1:9～9.5pH,,。2.4　N、P5。5,P,(pH=11),pH,P。pH=9N,,。5。5　N、P2.5　1,1,pH10,,pH99.5,103.62%(,100),pH,。pH10,85%,,P,,。pH11135.8mg/L,47.53%,MAP,,,,,,,,。P,632.65mg/L,pH8.5～9.5P,,XRD。1　pH7.588.599.51011ρ(N)/(mg·L-1)274.30280.97285.17296.05296.05243.12135.80ρ(P)/(mg·L-1)662.66652.11688.47681.96672.66608.51451.38/%96.0098.3499.80103.62103.6285.1047.532.6　,2。913　第6期杨　阳,等:不同pH值条件下磷酸铵镁沉淀产物特性研究,3。2　mg/L　pHρCODρρSSρρ9.729000280060～10030～60750～15806.91780030702803　pH/%ρ/(mg·L-1)875.480.1104174981.884.778959.586.790.339411079.783.553251169.470.21321063　　　(1)MgCl2Na2HPO4MgP,90%。(2)pH,pH9～9.5。92.92%,50.57mg/L。(3)pH=9,pH=9.5,pH,。(4),pH=9N、P,。,。(5),,pH9～9.5。[　　　][1]　,　.MAP[J].,2006,32(2):34-37.[2]　　,　,,.[J].,2009,30(5):1443-1448.[3]　KayeH,Kilburn.Isinhaledammonianeurotoxic?[J].En-vironmentalManagementandHealth,2000,11(3):239-250.[4]　,　,,.[J].,2008,34(2):45-49.[5]　LiXZ,ZhaoQL,HaoXD.Ammoniumremovalfromland-fillleachatebychemicalprecipitation[J].WasteManage-ment,1999,19(6):409-415.[6]　,,　,.[J].:,2004,19(2):1-2.[7]　,,,.[J].,2008,40(10):1553-1557.[8]　　,,　.MAP[J].:,2010,33(3):429-431.[9]　PasiorL,ManginD,BaratR,etal.Apilot-scalestudyofstruviteprecipitationinastirredtankreactor:conditionsin-fluencingtheprocess[J].BioresourceTechnology,2008,99(14):6285-6291.[10]　,　,,.[J].,2008,27(6):775-778.[11]　,　,VanRechtMCM,.MAP[J].,2009,30(4):1120-1125.[12]　OhlingerKN,YoungTM,SchroederED.Predictingstruviteformationindigestion[J].WaterResearch,1998,32:3607-3621.[13]　.[M].:,2007:9-12.[14]　《》.[M].3.:,1989:252.[15]　　,,.[J].,2009,29(2):353-359.[16]　LeeSI,WeonSY,LeeCW,etal.Removalofnitrogenandphosphatefromwastewaterbyadditionofbitter[J].Chemosphere,2003,51:265-271.(　)914　　　合肥工业大学学报(自然科学版)第34卷