工艺条件对鸟粪石晶体的粒径和沉降速度的影响林金清1

82Vol．8No．220142ChineseJournalofEnvironmentalEngineeringFeb．2014361021Stokes。10～200μm20～100μm30～55μm40～65μm。pHpH9.01∶12∶11∶1～1.2∶11.2∶1。X703A1673-9108201402-0563-05EffectofprocessconditionsontheaverageparticlesizeandsettlingvelocityofstruvitecrystalLinJinqingZhangYushengLiChaoqunCollegeofMaterialsScience＆EngineeringHuaqiaoUniveersityXiamen361021ChinaAbstractTheaverageparticlesizeofstruvitecrystalswasmeasuredunderdifferentprocessconditionsinadoublepipes/CO2strippingpackedlayerphosphorusrecoverypilotunitwiththeaidoflaserparticlesizeanaly-zeranditsvariationswasindetailinvestigated．ThesettlingvelocityofthestruvitecrystalswasevaluatedwithStokesformulawhichwasmodifiedbytakingintoaccounttheinfluenceofstruvitecrystalshape．Theresultsshowthattheparticlesizesofstruvitecrystalsareintherangeof10to200μmwithmainlybetween20～100μm．Packingandairingwillbebeneficialforenhancingaverageparticlesizefrom40to65μmandsettlingvelocityofstruvitecrystalsinthephosphorusrecoveryequipmentcomparedtonopackingandairingwiththeaveragesizefrom30to55μm．TheparticlesizeandsettlingvelocityofstruvitecrystalsincreasewithanincreaseofpHwhereasinverselyforpH＞9thesizeandsettlingvelocitydecrease．Ammonia-nitrogen/phosphorusmolarra-tiofrom1∶1to2∶1resultsinaslightincreaseintheparticlesizeandsettlingvelocityofstruvitecrystalsbutfur-therincreaseinratiodoesnotchangetheparticlesizedistributionandsettlingvelocity．Theparticlesizeandset-tlingvelocityofstruvitecrystalsareelevatedwhenmagnesium/phosphatemolarratiospansfrom1∶1to1.2∶1whilemagnesium/phosphatemolarratioexceeds1.2∶1thesizeandsettlingvelocitydecrease．Additionallyitshouldbenotedthattheparticlesizeandsettlementvelocityofstruvitecrystalsincreaseathigherinitialphos-phorusconcentration．Keywordsphosphorusrecoverystruvitepackedlayerparticlesizesettlingvelocity2006HG0283502Z200930302013－01－262013－03－301963～。[e-mail]、123、485。6。7。。、、pH、8-10。Strat-ful111min180minNH4+PO3－44%0.1mm3.0mm。Burns1216～30μm16～47μm63～110μm216～40μm47～78μm2。13-12～25μm。14151617。Mastersizer2000EStokes。11.1BSA224SSartoriousPB-10pHBT00-1JTU-1800ACQ-009LZB-6Mas-tersizer2000E。K2HPO4·3H2ONH4ClMgCl2·6H2ONaOHNaHCO3。1.214-171。1Fig.1Diagramfordoublepipes/CO2strippingpackedlayerphosphorusrecoveryunit30mm、1750mm55mm、450mm110mm、220mm3.2L。、、pHpHpH。pH14-17。pH。1.3。2.5%pH2h。4652。Mastersizer2000E2min。1.4。Stokes1819v=gρs－ρ18μd21vdρs、ρgμ。201。PS=1.03槡χχ1.0、1.0～0.8、0.8～0.65、0.65～0.5、＜0.519χ0.5v’=PSv。、。22.177.5mg/LN/Mg/P=5.0∶1.2∶1pH9.202。0.5μm500μm20～100μm。40～65μm30～55μm13-21。2Fig.2Particlesizedistributionofstruvitecrystal2.2pHpH3。“”“”。40mL/min160L/h210cm。3pHFig.3ParticlesizeandsettlingvelocityatdifferentpH3pHpH9.0。pH9.01.167×10－3m/s。pHpH。pH。2.34456581∶12∶1。55μm21.013×10－3m/s。4Fig.4ParticlesizeandsettlingvelocityatdifferentN/P2.4551∶1～1.2∶11.2∶1。1.28.63×10－4m/s。16171.2∶1～1.3∶1。5Fig.5ParticlesizeandsettlingvelocityatdifferentMg/P6Fig.6Particlesizeandsettlingvelocityatdifferentinitialphosphorusconcentrations2.56645μm。77.5mg/L8.63×10－4m/s。3130～55μm40～65μm-。20.5μm500μm20～100μm77.5mg/LN∶Mg∶P=5∶1.2∶18.63×10－4m/s。3pH9.0pHpH9.01∶12∶11∶1～1.2∶11.2∶1。66521PrettyJ．N．MasonC．F．NedwellD．B．etal．Environ-mentalcostsoffreshwatereutrophicationinEnglandandWales．EnvironmentalScience＆Technology2003372201-2082SchulingＲ．D．AndradeA．Ｒecoveryofstruvitefromcalfmanure．EnvironmentalTechnology1999207765-7683LiX．ZhaoQ．L．Ｒecoveryofammonium-nitrogenfromlandfillleachateasamulti-nutrientfertilizer．EcologicalEngineering2003202171-1814De-BashanL．E．BashanY．Ｒecentadvancesinremovingphosphorusfromwastewateranditsfutureuseasfertilizer1997-2003．WaterＲesearch200438194222-42465DoyleJ．D．PhilpＲ．ChurchleyJ．etal．Analysisofstruviteprecipitationinrealandsyntheticliquors．ProcessSafetyandEnvironmentalProtection200078B6480-4886．．201133671-75LiYongmeiLiuMingyanYuanZhiwen．Ｒeviewofthestruvitecrystallizationtechnology．EnvironmentalPollution＆Control201133671-75inChinese7ＲahamanM．S．MavinicD．S．ＲecoveringnutrientsfromwastewatertreatmentplantsthroughstruvitecrystallizationCFDmodellingofthehydrodynamicsofUBCMAPfluid-ized-bedcrystallizer．WaterScienceandTechnology200959101887-18928LoewenthalＲ．E．KornmüllerU．Ｒ．C．VanHeerdenE．P．Modellingstruviteprecipitationinanaerobictreatmentsystems．WaterScienceandTechnology19943012107-1169BouropoulosN．C．KoutsoukosP．G．Spontaneousprecipi-tationofstruvitefromaqueoussolutions．JournalofCrystalGrowth20002133-4381-38810LeCorreK．S．Valsami-JonesE．HobbsP．etal．Phosphorusrecoveryfromwastewaterbystruvitecrystalli-zationAreview．CriticalＲeviewsinEnvironmentalSci-enceandTechnology2009396433-47711StratfulI．ScrimshawM．D．LesterJ．N．Conditionsin-fluencingtheprecipitationofmagnesiumammoniumphos-phate．WaterＲesearch200135174191-419912BurnsＲ．T．MoodyL．B．CelenI．etal.Optimizationofphosphorusprecipitationfromswinemanureslurriestoenhancerecovery．WaterScienceandTechnology2003481139-14613．．201263936-940LiChaoqunLinMulanLinJinqing．Influencesofprocessconditionsonparticlesizeinstruviteprecipitationforphosphorusrecoveryfromwastewater．ChineseJournalofEnvironmentalEngineering201263936-940inChinese14．．ZL201020187312.5LinJinqingL