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Studyonthetreatmentofwastewaterwithhighlyconcentratedammonia-nitrogenbychemicalprecipitationXuZhigao1,HuangQian2,ZhangJiandong1,WuYanke1,ZhangLi1,WangLijun1(1.GeneralResearchInstituteforNonferrousMetals,Beijing100088,China;2.SchoolofMechanicalElectronic&InformationEngineering,ChinaUniversityofMining&Technology,Beijing100083,China)1,2,1,1,1,1(1.,100088;2.,100083)[]MgCl2·6H2ONa2HPO4·12H2O,MgNH4PO4·6H2O(MAP)。:pH9.0~10.5HPO42-,Mg2+NH4+;pH,n(P)∶n(N),n(Mg)∶n(N),pH=9.5,n(Mg)∶n(N)∶n(P)=1.2∶1∶0.9,25℃20min,30min。,3880mg/L,95%,1.1mg/L。[];;[]X703.1[]A[]1005-829X(2010)06-0031-04Abstract:Magnesiumchlorideanddisodiumhydrogenphosphateareusedasprecipitatorinthepresentstudy.Theremovalofammonia-nitrogenfromthesimulativewastewaterbymagnesiumammoniumphosphate(MAP)chemi-calprecipitationhasbeenstudiedbysinglefactorexperimentandorthogonalmethod.Theresultsshowthatthedis-solvedphosphorusmainlyexistsasHPO42-inaqueoussolutionintherangeofpH9.0-10.5,andreactswithMg2+andNH4+toremoveammonia-nitrogen.TheinitialpHisthekeyfactorwhichaffectstheremovalofammonia-nitrogenandtheresidualofphosphormostly,andn(P)∶n(N)next.Butn(Mg)∶n(N)andinitialconcentrationofammonia-nitrogenarelessaffected.Theoptimalconditionsareasfollows:thepH=9.5,n(Mg)∶n(N)∶n(P)=1.2∶1∶0.9,reactiontemperature25℃,reactiontime20minandagingtime30min.Thewastewaterfromthepilot-scaleworkshopofzirconiumandhafniumseparation,whoseinitialammonia-nitrogenconcentrationis3880mg/L,istreated.Itsam-monia-nitrogenremovalrateisabove95%,whiletheresidualofphosphorcouldbeabout1.1mg/L.Keywords:chemicalprecipitation;ammonia-nitrogen;magnesiumammoniumphosphate,。:、、、、。、、,,300mg/L〔1-2〕。2090,,、〔3-5〕。,MAP、、、〔6〕。Cl-SO42-,NH4Cl、(NH4)2SO4NH4OH,,pH、、、,,30620106IndustrialWaterTreatmentVol.30No.6Jun.,201031——2010-06,30(6)。11.1,3.88g/L、CODCr5.0g/L、4.08g/L、1.64g/L、0.01mg/L、pH9.2。1.2NH4Cl、(NH4)2SO4、NH4OH、MgCl2·6H2O、Na2HPO4·12H2ONaOH。NH4Cl、NH4OH(NH4)2SO4。TLJ-2,;pHS-2FpH,。1.3500mL。250mL,Na2HPO4·12H2O,,10mol/LNaOHpH,5mol/LMgCl2,10mol/LNaOHpH,20min,,,,,。,pHNH4Cl、NH4OH(NH4)2SO4,,,,。。1.4;(ICP-AES)。22.1pH2000mg/L,25℃,n(Mg)∶n(N)∶n(P)=1∶1∶1,20min,15min,pHNH4Cl、NH4OH(NH4)2SO412。12,pH,;pH9~11,90%,10%,,pHMgNH4PO4,Cl-SO42-MgNH4PO4。12,pH,。,H3PO4、H2PO4-、HPO42-PO43-〔7〕,pH,,3。3,pH9.0~10.5,HPO42-,98%;pH9.5,HPO42-99.5%。2.2L9(34),,。32——2010-06,30(6)2/(mg·L-1)/%/(mg·L-1)115995.901.0218695.201.1317295.561.11。1,,pH,n(Mg)∶n(N)n(P)∶n(N),,A1B2C2D3,pH9.5,1000mg/L,n(Mg)∶n(N)1.2,n(P)∶n(N)1.1。,pH,n(P)∶n(N),,n(Mg)∶n(N),A1B3C2D1,,,A1B3C2D1,pH9.5,3000mg/L,n(Mg)∶n(N)1.2,n(P)∶n(N)0.9。2.3,NH4Cl5、10、20、40、60min,30min,NH4+-N,4。4,,,。10、20、40min95%,0.08%。20、40min,,。60min,。60min,。,20min。2.4,20min,30min,10、20、25、30、50℃NH4Cl,5。5,,,,25℃,50℃;,,25℃。MgNH4PO4,。2.5,pH9.5,n(Mg)∶n(N)=1.2,n(P)∶n(N)=0.9,20min,30min,2。2,,MAP,95%,,。3(1)MgCl2·6H2ONa2HPO4·12H2O,:1ApHB/(mg·L-1)Cn(Mg)∶n(N)Dn(P)∶n(N)/%/%19.55001.10.984.800.3729.510001.21.095.900.3639.530001.41.194.700.08410.05001.21.196.004.03510.010001.40.983.500.06610.030001.11.093.42.0710.55001.41.059.406.32810.510001.11.190.708.08910.530001.20.981.900.05K1275.40240.20268.93250.20K2272.93270.10273.80248.73K3232.00270.03237.60281.40k191.8080.0789.6483.40k290.9890.0391.2782.91k377.3390.0179.2093.80R14.479.9712.0710.89K’10.8110.7210.450.49K’26.098.504.438.68K’314.452.146.4712.19k’10.273.573.480.16k’22.032.831.482.89k’34.820.712.164.06R’4.542.862.013.9033——[](2008SK4024);(06C101),pH,pH9.0~10.5HPO42-,Mg2+NH4+。(2)pH,n(P)∶n(N),n(Mg)∶n(N),,pH9.5,3000mg/L,n(Mg)∶n(N)=1.2,n(P)∶n(N)=0.9,25℃20min,30min,95%,0.1%。(3),。[][1],.[J].,2002,15(2):24-26.[2],,.[J].,2009,7(3):26-32.[3]ChimenosJM,FernándezAI,VillalbaG,etal.Removalofam-moniumandphosphatesfromwastewaterresultingfromtheprocessofcochinealextractionusingMgO-containingby-product[J].WaterResearch,2003,37(7):1601-1607.[4]ElDiwaniG,ElRafieS,ElIbiariNN,etal.Recoveryofammonianitrogenfromindustrialwastewatertreatmentasstruviteslowreleas-ingfertilizer[J].Desalination,2007,214(1/2/3):200-214.[5],.[J].,2008,33(6):90-94.[6]YetilmezsoyK,Sapci-ZenginZ.RecoveryofammoniumnitrogenfromtheeffluentofUASBtreatingpoultrymanurewastewaterbyMAPprecipitationasaslowreleasefertilizer[J].JournalofHazardousMaterials,2009,166(1):260-269.[7],,,.Logistic[J].,2007,37(22):48-52.[](1975—),2007,E-mail:xuzhigaotc@yahoo.com.cn。:,:010-82241308。[]2010-02-26()StudyonthetreatmentofslightlypollutedrawwaterofXiangjiangRiverbyO3-biologicalzeoliteprocessWangYunbo,ZhengSixin(CollegeofWaterConservancy,ChangshaUniversityofScienceandTechnology,Changsha410114,China)-,(,410114)[],-。:,CODMnNH3-N43.1%93.4%,2.2mg/L,15min,2.3m/h,CODMn、53.6%86.1%。[];;[]TQ085+.41[]B[]1005-829X(2010)06-0034-03Abstract:AccordingtothecharacteristicsoftherawwaterofXiangjiangRiver,theexperimentonpollutantre-movalbythecombinedprocessofozone(O3)andbiologicalzeolitehasbeenconducted.Theresultsoftheexperi-mentaimingattheinfluentwaterqualityshowthatbeforethebiologicalfilmisformed,thehighestremovalratesofCODMnandammonia-nitrogenreach43.1%and93.4%,respectively.Afterthefilmismatured,andwhentheozonedosageisabout2.2mg/L,oxidationcontacttime15min,andhydraulicloadabout2
本文标题:化学沉淀法处理高浓度氨氮废水的工艺研究徐志高
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