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INDUSTRIALWATER&WASTEWATERVol.40No.2Apr.,2009A/O,,,,(,650093)(CFA)。1×108t/a,41.7%,、[1-2]。———,。1985,HollerWirsching[3],。、、,:2008-10-14;:2008-12-01:NaOH,。、NaOH、、,,A/O。:700℃、NaOH1mol/L、5∶1mL/g、36h,167mmol/100g,12.8,160mmol/100g;A/O1h,2g/100mL,pH6.0~9.0,NH3-N、COD46.7%、17.6%62.6、197.8mg/L,NH3-NFreundlich。:;;;:X784.035:A:%1009-2455(2009)02-0068-04ApplicationofzeolitesynthesizedfromcoalflyashintreatmentofeffluentfromA/OcokingwastewatertreatmentsystemHUChao-shuai,HUKai-lin,WANGZheng-xing,MAYu-jie,ZHANGJin(FacultyofEnvironmentalScienceandEngineering,KunmingUniversityofScienceandTechnology,Kunming650093,China)Abstract:WithNaOHasalkalinesource,thecoalflyashcouldbetransformedintozeolitebyhydrothermalcrystallizationprocess.Throughchangingincandescetemperature,concentrationofNaOH,liquid-solidratio,crystallizationtime,theinfluenceofsynthesisconditiononthecationexchangecapacityofthesynthesizedzeolitewasinvestigated,andthen,thesaidzeolitewasusedtotreateffluentfromA/Ocokingwastewatertreatmentsystem.Theresultsshowedthat:undertheconditionthat,theincandescetemperaturewas700℃,themassconcentrationofNaOHwas1mol/L,theliquid-solidratiowas5∶1mgL/g,thecrystallizationtimewas36h,themaximalcationexchangecapacityofthesynthesizedzeolitewas167mmol/100g,whichwas12.8timesthecationexchangecapacityoftherawcoalflyash,higherthanthenaturalzeolite(160mmol/100g);theoptimalconditionforthesynthesizedzeolitetreatingeffluentfromA/Ocokingwastewatertreatmentsystemwas:thereactiontimewas1h,thedosageofthesaidzeolitewas2g/100mL,thepHvaluewas6.0-9.0.Undertheabovecondition,theremovalrateofNH3-NandCOD,theeffluentconcentrationofthetwowere46.7%,17.6%,62.6,197.8mg/Lrespectively,theadsoptionofthesynthesizedzeoliteonNH3-NfittedtheFreundlichisotherm.Keywords:coalflyash;zeolite;hydrothermalcrystallization;cokingwastewater·68·,、、[4]。,,,、NaOH、、(CEC),A/O。11.1,1,1.25。,A/O,,A/OA/O。2。1.2,,,,,、。Murayama[5],NaOH,120℃,KOHNa2CO3。P,NaOH,100℃。,2h,500mLNaOH,100℃,,0.045μm,。[6],CEC。CEC,。1.3A/O100mL2g,250mL,,22℃、100r/min,,CODNH3-N,COD、NH3-N。NH3-N1150mg/L,,、,NH3-N,,。22.12.1.1CECNaOH1mol/L、5∶1mL/g、100℃、24h,CEC(1)。,,。CEC,1CEC,700℃,CEC。700℃。2.1.2NaOHCEC700℃、5∶1mL/g、100℃、24h,NaOHCEC(2)。NaOH,Na+,OH-,1CECFig.1EffectofincandescetemperatureonCECofzeolitesynthesizedfromCFA2004006008001000/℃180160140120100CEC/(mmol·100g-1)2Tab.2Characteristicsofcokingwastewater528011502659.3A/O240117.4556.1ρ(NH3-N)/(mg·L-1)/NTUpHρ(COD)/(mg·L-1)w(SiO2)45.47w(Al2O3)30.90w(Fe2O3)9.93w(CaO)3.02w(MgO)1.55w(K2O)0.58w(Na2O)0.07w(SO3)0.31w()8.171Tab.1ChemicalcompositionofCFA%,,,:A/O·69·INDUSTRIALWATER&WASTEWATERVol.40No.2Apr.,2009OH-[4]。2,CECNaOH,1、4、5mol/L,1mol/LCEC,,NaOH1mol/L。2.1.3CEC700℃、NaOH1mol/L、100℃、24h,CEC(3)。3,,,,CEC。5∶1mL/g,CEC,,5∶1mL/g。2.1.4CEC700℃、5∶1mL/g、NaOH1mol/L、100℃,CEC(4)。,。4,36h,36h,。36hCECP,36h,P、CEC。,36h。,:700℃、NaOH1mol/L、5∶1mL/g、36h。,CEC167mmol/100g,13mmol/100g,()160mmol/100g。2.2A/O,COD、NH3-N240.0、117.4mg/L。、、pHCOD、NH3-N。2.2.12g/100mL,5,CODNH3-N,COD45min17.6%,NH3-N60min46.7%,COD197.8mg/L,NH3-N62.6mg/L。,60min,。2.2.260min,6,2NaOHCECFig.2EffectofNaOHconcentrationonCECofzeolitesynthesizedfromCFA01234567NaOH/(mol·L-1)180160140120100CEC/(mmol·100g-1)3CECFig.3Effectofliquid-solidratioonCECofzeolitesynthesizedfromCFA2∶1/(mL·g-1)1801601401201008060CEC/(mmol·100g-1)5∶18∶110∶115∶14CECFig.4EffectofcrystallizationtimeonCECofzeolitesynthesizedfromCFA12243648607284/h1801601401201008060CEC/(mmol·100g-1)5Fig.5ChangeofremovalratesofCODandNH3-Nalongwithtime60120180240300/min50403020100/% CODNH3-N·70·,A/O。2g/100mL,COD10.6%17.6%,NH3-N27.1%46.7%。2g/100mL,。,2g/100mL。2.2.3pH2g/100mL,60min。7,pH3.9~11.0,NH3-N11.6%~46.7%,COD15.6%~17.2%,pHNH3-N,COD。pH6.0~9.0,NH3-N46%,pH6.010.0,NH3-N,。2.2.48NH3-N,8,NH3-N。Freundlichqe=k·Ce1/n(,qe(mg/g),Ce(mg/L),k、n),::qe=0.050·Ce0.725(r=0.995);:qe=0.147·Ce0.783(r=0.989)。3(1),CEC167mmol/100g,12.8,160mmol/100g。NaOH,100℃,:700℃、NaOH1mol/L、5∶1mL/g、36h。(2)1h、2g/100mL、pH6.0~9.0,A/ONH3-NCOD46.7%、17.6%,NH3-NCOD62.6、197.8mg/L,。,NH3-NFreundlich。:[1],,,.[J].,2008,27(3):326-335.[2],,.[J].,1999,30(3):1-3.[3]HollerH,WirschingU.Zeoliteformationfromflyash[J].Fortsch-rittederMineralogie,1985,63(1):21-27.[4],,,.A/O2GC/MS[J].,2006,26(11):1785-1791.[5]NorihiroMurayama,HidekiYamamoto,JunjiShibata.Mechanismofzeolitesynthesisfromcoalflyashbyalkalihydrothermalreaction[J].IntJMinerProcess,2002,64(1):1-17.[6]JGJ/T112-97.[S].:(1985-),,,,,()0871-5186077()greateagle2006@sina.com。 8NH3-NFig.8RelationshipbetweenremovalrateofNH3-Nanditsinitialconcentration20040060080010001200ρ(NH3-N)/(mg·L-1)50403020100NH3-N/% 6Fig.6RelationshipbetweenremovalratesofCODandNH3-Nandzeolitedosage12345678/(g·100mL-1)50403020100/%CODNH3-N 7pHFig.7ChangeofremovalratesofCODandNH3-NwithdifferentpHvalues34567891011pH50403020100/%CODNH3-N,,,:A/O·71·
本文标题:粉煤灰合成沸石及其处理焦化废水AO出水的试验户朝帅
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