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:1671-9662(2008)03-0032-03MAP李晓燕,胡红伟(平顶山工学院,河南平顶山467044) : 采用MgCl2·6H2O和Na2HPO4·12H2O使焦化废水中的氨氮形成磷酸氨镁沉淀的化学沉淀法(MAP法),通过正交实验和单因子优化实验,研究了pH值、反应时间、药剂配比对氨氮去除效果的影响。实验结果表明:在pH值为9.0,反应时间为20min,n(Mg2+):n(NH+4):n(PO3-4)=1.4∶1.0∶1.0条件下,氨氮的去除率达到96.3%。: 磷酸铵镁(MAP);焦化废水;氨氮;废水处理: X703.1 :A ,。,,,(MAP)。MgCl2·6H2ONa2HPO4·12H2O(MAP)。1 NH+4,,MgNH4PO4·6H2O(MAP)、MnNH4PO4、NiNH4PO4、ZnNH4PO4。MAPNH+4PO3-4,MgNH4PO4·6H2O,: Mg2++HPO2-4+NH+4+6H2O※MgNH4PO4·6H2O↑+H+ Mg2++PO3-4+NH+4+6H2O※MgNH4PO4·6H2O↑ Mg2++H2PO-4NH+4+6H2O※MgNH4PO4·6H2O↑+2H+ 25℃MgNH4PO4·6H2Oksp=2.5×10-13,,MAP。 Mn、Ni、Zn,,。Mg2+,Mg2+,,,,,,、。,,,。2 2.1 ,1。1 指标数值pH9.1NH3-N2140mg/LCOD3640mg/L酚1280mg/L2.2 :MgCl2·6H2O,Na2HPO4·12H2O,NaOH,()。 :DBJ-623,pHS-3TC,。2.3 NH3-N。2.4 1000ml,500ml(150r/min),,Na2HPO4·12H2OMgCl2·6H2O,NaOHpH。:2008-03-09:李晓燕(1980-),女,山东兖州人,郑州大学化学系在职研究生,平顶山工学院化学化工系助教。17320085 平顶山工学院学报JournalofPingdingshanInstituteofTechnology Vol.17No.3May.2008DOI:10.14140/j.cnki.hncjxb.2008.03.005,,。3 3.1 MAP,MAP:pH、、、,。:,30℃,,,。,25℃~30℃。L9(34),25℃,2,,,3。2 水样pHAn(PO3-4∶n(NH4+)Bn(Mg2+)∶n(NH4+)C反应时间(min)D水平18.50.81.015水平29.01.01.220水平39.51.21.4253 序号因素ABCD氨氮去除率%18.50.81.01581.3628.51.01.22082.3838.51.21.42579.4449.00.81.22594.0259.01.01.41596.3169.01.21.02080.0579.50.81.42082.6289.51.01.02581.5099.51.21.21578.18K181.068680.9785.28K290.1286.7384.8681.68K380.8879.2286.1284.99极差R9.247.515.153.64因素主次IIIIIIIV较优水平A2(9.0)B2(1.0)C3(1.4)D1(15) 3:pH,,。1 pH3.2 ,,500ml,150r/min,pH、n(PO3-4):n(NH+4)、n(Mg2+):n(NH+4)、。3.2.1 pH值对氨氮去除率影响 3,pH。pH,n(PO43-):n(NH4+)、n(Mg2+)=1.0:1.0:1.4,15min,pH7.5、8.0、8.5、9.0、9.5、10.0、10.5,pH。1。 1:pH7.5~9.0,pH,pH9.5pH9.0,pH9.5,pH,MgNH4PO4Mg3(PO4)2,NH+4NH3,。,pH9.0。3.2.2 Na2HPO4投加量对氨氮去除率影响 pH9.0,n(Mg2+):n(NH+4)=1.4∶1.0,15min,Na2HPO4·12H2O,n(PO43-):n(NH4+)0.7、0.8、0.9、1.0、1.1,n(PO3-4):n(NH+4),2。173 :MAP 33 2:Na2HPO4·12H2OMAP,,Na2HPO4·12H2O。,n(PO3-4):n(NH+4)1.0∶1.0,96%。3.2.3 MgCl2投加量对氨氮去除率影响 pH9.0,n(PO3-4):n(NH+4)=1.0:1.0,15min,MgCl2,n(Mg2+):n(NH4+)1.0、1.1、1.2、1.3、1.4、1.5,n(Mg2+):n(NH+4),3。 3:n(Mg2+):n(NH+4)1.1,MgCl2,,;n(Mg2+):n(NH+4)≥1.1,90%;n(Mg2+):n(NH+4)1.3~1.4,95%;n(Mg2+):n(NH+4)1.4,。,n(Mg2+):n(NH+4)1.4。3.2.4 反应时间对氨氮去除率影响 pH9.0,n(P):n(N):n(Mg)=1.0:1.0:1.4,10min、15min、20min、25min、30min、60min,,4。4 4:90%。,30min,,MAP,MAP。,,,。,20min。4 MgCl2·6H2ONa2HPO4·12H2O,,pH、、。:(1)pH,,;(2)MAP:pH9.0,20min,n(Mg2+):n(NH+4):n(PO3-4)=1.4:1.0:1.0。,96%。[1], .MAP[J].,2006,32(2):34-36.[2],,.、[J].,2006,7(7):128-132.[3],,.MAP[J].,2006,16(2):144-146.[4].()[M].:,1998.[5],.MAP[J].,2003(4):28-30.[6],,.[J].,2003,23(10):34-36.[7],,.[J].(),2004,27(1):28-30.(下转第38页)34 200852001,35(17):4191-4199.[3].[M].:,1986.TreatmentofhighconcentrationAmmonia-NitrogenwastewaterbyCrystallization-combinedchemicalprecipitationprocessZHANGle-guan,LIUBiao(EnvironmentEngineeringDepartmentofPingdingshanInstituteofTechnology,Pingdingshan467044China)Abstract:Onthebaseoftreatmentofhighconcentrationammonia-nitrogenwastewaterbychemicalprecipitationprocess,thispaperintroducedtheideaofcrystallization-combinedchemicalprecipitationprocess,thatis,chooseactivationzeolite,activationclayandac-tivationcoalashascrystalseedtobeputintotherector,andthen,analyzedtheeffectfromthefollowingaspects:removerateofammo-nia-nitrogen,particletypeandparticlediameter,andsimultaneously,observingcomponentsofthecrystalusingXraydiffraction.Theresultsshowedthataddingcrystalseedisgoodforammonia-nitrogenwipingoffrate,butbadforformbigparticlediametercrystal.Keywords:crystallization;chemicalprecipitationprocess;ammonia-nitrogenwastewater(上接第34页)ExperimentalresearchontreatmentforAmmoniumNitrogenfromcokingwastewaterbyMAPprocessLIXiao-yan,HUHong-wei(EnvironmentEngineeringDepartment,PingdingshanInstituteofTechnology,Pingdingshan467044,China)Abstract:UsingMgCl2·6H2OandNa2HPO4·12H2Otoreactwithammonium-nitrogenofcokingwastewater,formingmagnesiumam-moniumphosphate(MAPprocess),throughorthogonaltechnicaltreatmentprocessingandsingle-factoroptimizationprocessingstudytheeffectsofpHvalue,thereactiontime,andtheratioofMg2+:NH4+:PO3-4ontheremovalofammonium-nitrogen.Theexperimen-talresultsdemonstratesthatthepHvalueisabout9.0,thereactiontimeis20minutes,undertheconditionofn(Mg2+):n(NH4+):n(PO3-4=1.4:1.0:1.0,theremovalrateofammonium-nitrogenisupto96.3%.Keywords:magnesiumammoniumphosphate(MAP);cokingwastewater;ammonium-nitrogen;wastewatertreatment38 20085
本文标题:MAP法处理焦化氨氮废水的实验研究李晓燕
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