第22卷第3期2010年9月常州大学学报(自然科学版)JournalofChangzhouUniversity(NaturalScienceEdition)Vol.22No.3Sep.2010:2095-0411(2010)03-0046-03*1,2, 1, 1, 1(1.,213164;2.,213163):MgCl2·6H2ONaH2PO4·2H2ONH+4,,。pH9.0-9.5,n(Mg2+)∶n(NH+4)∶n(PO3-4)1.2∶1.0∶1.3,99%,28869mg·L-1200mg·L-1。:;;;:X703 :AStudyofthePretreatmentofHighlyConcentratedAmmonia-NitrogenwasTewaterbyChemicalPrecipitationLEIChun-sheng1,WANGGui-yu2,YaoQian1,TangLu1,WangKan1(1.SchoolofEnvironmentalandSafetyEngineering,ChangzhouUniversity,Changzhou213164,Chi-na;2.ChangzhouWaterPurificationMaterialsInc.Ltd.,Changzhou213163,China)Abstract:ByreactionofchemicalprecipitationagentsMgCl2·6H2OwithNaH2PO4·2H2OandNH+4inthepharmaceuticalwastewater,magnesiumammoniumphosphateprecipitationwasgenerated.Atthesametime,thispaperdiscussedtherateofammonianitrogenremovalunderthedifferentoperationcondi-tions.Whendosingpharmaceuticaln(Mg2+)∶n(NH+4)∶n(PO3-4)was1.2∶1.0∶1.3,effluentammonianitrogenremovalratereachedmorethan99%andthemassconcentrationofammoniathroughthesecondarytreatmentbychemicalprecipitationdecreasedfrom28869mg·L-1to200mg·L-1undertheconditionsofthepH9.0-9.5.Keywords:pharmaceuticalwastewater;chemicalprecipitation;magnesiumammoniumphosphate;ammonia [1],,[2],,,、,(MAP)[3]。[4]13031mg·L-13220mg·L-1,[5]2000mg·L-115mg·L-1,20000mg·L-1。,。1 *:2009-05-18:(CN2009047):(1978-),,,,。1.1 ,,。:Mg2++NH+4+H2PO-4+6H2OMgNH4PO4·6H2O↑+2H+Ka=2.51×10-13(25℃),,,。1.2 ,,28869mg·L-1。200mL,pH。MgCl2·6H2ONaH2PO4·2H2O。,10mol·L-1NaOH1mol·L-1HClpH,25℃30min,,,。(GB7479-87)。2 2.1 pH100mL,MgCl2·6H2ONaH2PO4·2H2O,,,n(Mg2+)∶n(NH+4)∶n(PO3-4)1.2∶1.0∶1.1,pH,,1。1,pH,pH8.5-9.0,pH7.0,pH7.0-8.0,,pH9.0,,pH,OH-,NH+4,H2PO-4PO3-4,H+,,[6]。2.2 ,n(Mg2+)∶n(NH+4)∶n(PO3-4)1.2∶1.0∶1.1,pH8.5-9.0。200mL,10mol·L-1NaOHpH9.0,30min,5minNH3-N,,2。2,,,。10min,20min96.5%,,,30min。1 pHFig.1 pHvalueofthepharmaceuticalwastewaternitrogenremoval2 Fig.2 Reactiontimeontheremovalofammonia2.3 MgNH4PO4·6H2On(Mg2+)∶n(NH+4)∶n(PO3-4)1∶1∶1,,n(Mg2+)∶n(NH+4)=1∶1n(PO3-4)∶n(NH+4)=1∶1,Mg2+PO3-4,3、4。·47·雷春生等.化学沉淀法预处理高质量浓度的氨氮废水3 Mg2+Fig.3 Mg2+concentrationontheremovalofammonia4 PO3-4Fig.4 PO3-4concentrationontheremovalofammonia 3n(H2PO-4)∶n(NH+4)=1∶1,Mg2+,。Mg2+(3.14g·L-1)(3.20g.L-1),Mg2+,。4n(Mg2+)∶n(NH+4)=1∶1H2PO-4,n(H2PO-4)∶n(NH+4)=1.2∶1,H2PO-4。n(Mg2+)∶n(NH+4)∶n(PO3-4)1∶1∶1,75.84%,n(Mg2+)∶n(NH+4)1.2∶1,93.60%,n(PO3-4)∶n(NH+4)1.3∶1,93.21%,NaH2PO4·2H2O,MgNH4PO4·6H2O,。,,。,n(Mg2+)∶n(NH+4)∶n(PO3-4)1.2∶1.0∶1.3。2.4 pH9,n(Mg2+)∶n(NH+4)∶n(PO3-4)1.2∶1.0∶1.3,2,1,28869mg·L-16740mg·L-1,76.65%,2,200mg·L-1,99.31%。,2,28869mg.L-1200mg.L-1。,。,PO3-4,,。3 ①,,,。②:pH9.0,30min,n(Mg2+)∶n(NH+4)∶n(PO3-4)1.2∶1.0∶1.3,。③2,28869mg·L-1200mg·L-1,99.31%。:[1]StratfulI,ScrimshawMD,LesterJN.Conditionsinfluen-cingtheprecipitationofmagnesiumphosphate[J].WaterSciTechnol,2001,35(17):4191.[2]JamesDDoyle,SimonA.Parsonsstruviteformation,controlandrecovery[J].WaterResearch,2002,36:3925-3940.[3],,,.[J].,2007,29(6):562-566.[4],,,.[J].,2004,30(4):50-52.[5],,,.[J].,2004,24(1):46-48.[6]BookerNA,PrestleyAJ,FraserIH.Struviteformation,controlinwatertreatmentplants.Opportunitiesfornutrientsrecovery[J].EnvironTechnology,1999,2000(7):777-782.·48·常州大学学报(自然科学版) 2010年