MAP解 磊, 赵庆良(哈尔滨工业大学市政环境工程学院,黑龙江哈尔滨150090) : 金属磷化废水中磷酸盐浓度高,不适合生化处理,因此采用MAP沉淀法处理,并以卤片和氯化铵为沉淀剂,对反应装置的运行效果进行了研究。结果表明,最佳运行条件是:搅拌强度为200r/min、HRT=2.5h、pH值为9.5、[Mg2+]∶[NH+4]∶[PO3-4]为1.2∶1∶1,在最佳运行条件下系统对氨氮和磷酸盐的去除率分别达到97.5%、98%。 : MAP沉淀法; 磷化废水; 磷酸盐; 氨氮:X703 :C :1000-4602(2007)19-0087-04RecoveryofPhosphorusfromMetalSurfacePhosphateCoatingWastewaterbyMAPPrecipitationMethodXIELei, ZHAOQing-liang(SchoolofMunicipalEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China) Abstract: Themetalsurfacephosphatecoatingwastewaterisunsuitableforbiochemicaltreatmentduetoitshighstrengthphosphate.Therefore,theMAPprecipitationprocesswasused,andMgCl2andNH4Clwereusedasprecipitantstotreatthiswastewater.Theresultsshowthattheoptimaloperationcon-ditionsaremixingstrengthof200r/min,HRTof2.5h,pHof9.5andMg2+∶NH+4∶PO3-4ratioof1.2∶1∶1.Theresultantremovalratesofammonianitrogenandphosphateare97.5%and98%respectively. Keywords: MAPprecipitationmethod; phosphatecoatingwastewater; phosphate; ammonianitrogen (MAP)[1]。MAP、,,。,。MAP,,,。1 试验装置和材料1.1 MAP1。1 MAPFig.1 SchematicdiagramofMAPreactor MAP,·87·第23卷 第19期2007年10月 中国给水排水CHINAWATERWASTEWATER Vol.23No.19Oct.2007,,。,、,,,。1.2 ,:,;。1、2。,、pHMg2+[2]、pH。1 Tab.1 CharacteristicsofphosphatecoatingwastewaterpHZn2+/(mg·L-1)PO3-4/(mg·L-1)Ni2+/(mg·L-1)2.4~2.8150~3001000~300020~503.5~610~2530~1007~102 Tab.2 Characteristicsofexperimentalchemicals/%/%NH4Cl53.50≥9915NaOH40.00≥9620MgCl2·6H2O203.30≥46202 结果与讨论2.1 MAP,,,。,HRT,2、3。2 Fig.2 Removaleffectatdifferentmixingstrength3 Fig.3 Removaleffectatdifferenthydraulicretentiontime2,:200r/min,;=300r/min,,;,150r/min,,。200~300r/min。3,。HRT0.5~2.5h,;HRT3.5h,。,HRT2.5h。2.2 pHpHNH+4PO3-4,MAP。[Mg2+]∶[NH+4]∶[PO3-4]1∶1∶1、200r/min、HRT=2.5h,pH,4、5。4 pHFig.4 RemovaleffectofcontinuouswastewateratdifferentpH·88·第23卷 第19期 中国给水排水 pHFig.5 RemovaleffectofintermittentwastewateratdifferentpH4、5,pH,pH7~9.5pH,pH=9.5,pH。,pH8~9.5。pH。,,pH9~10。,pH9.5。2.3 Mg2+,[Mg2+]∶[NH+4]∶[PO3-4]1∶1∶1,MAP,Mg2+6、7。6、7,Mg2+,[Mg2+]∶[NH+4]∶[PO3-4]1.2∶1∶1,Mg2+,(7),Mg2+Mg3(PO4)2,MAP。6 Mg、N、PFig.6 RemovaleffectofcontinuouswastewateratdifferentmolarratioofMg,NandP7 Mg、N、PFig.7 RemovaleffectofintermittentwastewateratdifferentmolarratioofMg,NandP2.4 ,:[Mg2+]∶[NH+4]∶[PO3-4]1.2∶1∶1,pH9.5,HRT2.5h,200r/min。(30mg/L),,1∶15,。,,MAP,NaOHpH,8。8 Fig.8 Treatmentprocessofphosphatecoatingwastewater,9。9 Fig.9 Treatmenteffectofmixingwastewaterwithcontinuousoperation9,98%~·89·解 磊,等:MAP沉淀法回收磷化废水中的磷第23卷 第19期99.8%,97.5%~99%,、,。X。,,MAP,XRDPDF。3 初步经济分析,1300/t,200/t,2000/t,,524W,24h,,3%;500~1885/t[3~5],17.8,MAP1.24~25.01/m3(3)。3 Tab.3 Economicanalysisofphosphatecoatingwastewatertreatmentprocess·m-36.80.548.58~32.351.24~25.01 : 。4 结论MAP,、,pH=9.5、200r/min、[Mg2+]∶[NH+4]∶[PO3-4]1.2∶1∶1、HRT=2.5h,,97.5%、98%。:[1] ,.[J].,2006,22(9):93-96.[2] .(4)[M].:,2002.[3] BookerNA,PriestleyAJ,FraserIH.Struviteformationinwastewatertreatmentplants:opportunitiesfornutrientrecovery[J].EnvironTechnol,1999,20(7):77-82.[4] GaterellMR,GayR,WilsonR,etal.Aneconomicandenvironmentalevaluationoftheopportunitiesforsubstitu-tingphosphorusrecoveredfromwastewatertreatmentworksinexistingUKfertilizermarkets[J].EnvironTechnol,2000,21(10):67-84.[5] TaruyaT,UenoY,FujiiM.DevelopmentofPhosphorusResourceRecyclingProcessfromSewage[M].Paris:IWAWorldCongress,2000.E-mail:work06@tom.com:2007-04-24·90·第23卷 第19期 中国给水排水