改性粘土除氟剂处理高氟地下水研究陈涛

:　,,1982,,。#。＊(No.2008ZX07207-007-04);(No.2006BAJ08B09);(No.2007AA06A410);“985”。改性粘土除氟剂处理高氟地下水研究＊陈　涛1　韩卓育1　贾　旭1　张凤君1#　刘红梅1,2(,　130026;,　130021)　　　,,,。,0.3mol/LAl2(SO4)32%()NaOH1∶3(),1.0∶3.0(),400℃2h,0.2168mg/g;0.807mg/L,《》(GB5749—2006)(1mg/L);,。　　　　　　Treatmentofhighfluorinecontainedgroundwaterbymodifiedclayasdefluoridationreagent　ChenTao1,HanZhuoyu1,JiaXu1,ZhangFengjun1,LiuHongmei1,2.(1.CollegeofEnvironmentandResources,JilinUniversity,ChangchunJilin130026;2.NortheastMunicipalEngineeringDesignandResearchInstituteofChina,ChangchunJilin130021)Abstract:　Seriesofmodifiedclaywasobtainedbycalcinedtheclayaftermixinginmodifyingsolution(0.3mol/Lofaluminiumsulfate,2%ofNaOH)andemployedforremovingfluorinefromsyntheticsolution.Whenclaymixedinthemodifyingsolutionwithmassratioof1:3andcalcinedat400℃for2h,themodifiedexhibitedthebestdefluoridationefficiency.Treatingrawwaterbythismodifiedclaywithsolid-liquidratioof1.0∶37.5,theconcentra-tionofF-declinedfrom5.37mg/Lto0.865mg/Lafter3hofcontacting.Duringtheadsorptionprocess,tempera-turehadlittleimpactonfluorineadsorption,lowpHcouldenhancedthedefluoridationcapacityofmodifiedclay,Ca2+andMg2+advancedfluorineadsorptiontosomeextent,whiletheanionsinhibitedfluorineadsorptionmoreorless.Theusedmodifiedclaycouldberegeneratedbydigginginto0.3%aluminiumsulfatesolutionfor1hwithsolid-liquidratioof1.0∶2.5,thedefluoridationcapacityofmodifiedclaycouldreachbackto99.7%after3timeofregen-eration.Theperfectdefluoridationcapacityandregenerationabilityofmodifiedclayindicateditcouldbeusedforre-movingfluorinefromgroundwaterrepetitively.Keywords:　modifiedclay;defluoridation;influencingfactors;regenaration　　。[1],1.5mg/L、[2],[3]。,,。　　、、、、[4],、。,。,[5]、SRIMURALI[6]、ZEVENBERGEN[7]、、,。Al2(SO4)3NaOHAl(OH)3,Al(OH)3γ-AlO(OH)[8],,γ-Al2O3[9],,。,,,,。1　1.1　粘土及其金属含量,·40·　　31　9　20099DOI:10.15985/j.cnki.1001-3865.2009.09.0201　Table1　Contentofmainmetalsinclaymg/kg　KNaCaMgPbCdCrFeMnAl2232168409200522.764424477409821。1.2　主要仪器SX-10-12;PHS-5pH;PF-1;HT-6A。1.3　试验方法1.3.1　0.3mol/LAl2(SO4)32%()NaOH,,Al2(SO4)3NaOH1∶3(,),Al(OH)3。Al2(SO4)3NaOH1∶3,20,,。1、23。　　1、23,1.0∶3.0(,),400℃2h,0.2168mg/g。,Al(OH)3;。1.3.2　NaF,5.370mg/L(),,,[10],。,。1.3.3　Al2(SO4)3,,。2　2.1　改性粘土除氟剂的除氟性能2.1.1　25℃、0～50mg/L(4)。4,,Langmuir((1))。1/cs=13.72·1/ce+1.705(1):cs,mg/g;ce,mg/L。4　LangmuirFig.4　Langmuiradsorptionisothermoffluorinebymodifiedclay·41·　　2.1.2　1.0g50mL5.370mg/L,,5。5　Fig.5　Effectofcontactingtimeondefluoridationefficiency　　5,,;3h,,1.524mg/L。2.1.3　300mL5.370mg/L,3h,,6。6　Fig.6　Effectofadsorbentdosagesondefluoridationefficiency　　6,1.5g,(0.4338mg/g),,3.201mg/L;,,8.0g,0.865mg/L,《》(GB5749—2006)(1mg/L)。2.1.4　1.5g300mL5.370mg/L,3h,,7。　　7,,,,,。7　Fig.7　Effectoftemperaturesondefluoridationefficiency2.1.5　pH1.5g300mL5.370mg/L,pH,8。8　pHFig.8　EffectofpHondefluoridationefficiency　　8,pH=4,1.752mg/L;pH,,pH=10,3.769mg/L。,OH-,OH-F-,。2.1.6　(Ca2+、Mg2+、Fe2+、Mn2+)(CO2-3、HCO-3、SO2-4、Cl-),23。　　2,。Fe2+、Mn2+,;Ca2+、Mg2+,Ca2+Mg2+。,。　　3,。SO2-4,,SO2-4F-;·42·　　31　9　200992　1)Table2　EffectofcationsondefluoridationefficiencyofmodifiedclayCa2+Ca2+/(mg·L-1)Ca2+/(mg·L-1)/(mg·L-1)Mg2+Mg2+/(mg·L-1)Mg2+/(mg·L-1)/(mg·L-1)50.0048.303.2050.0040.883.20100.0079.963.07100.0097.923.20150.0096.063.07150.00106.143.07200.00107.202.94200.00115.723.07250.00126.312.81250.00149.563.07Fe2+Fe2+/(mg·L-1)Fe2+/(mg·L-1)/(mg·L-1)Mn2+Mn2+/(mg·L-1)Mn2+/(mg·L-1)/(mg·L-1)2.001.963.200.200.193.204.003.943.200.400.393.206.005.983.200.600.603.078.007.983.070.800.783.2010.009.993.071.000.963.20　　:1),3。3　Table3　EffectofanionsondefluoridationefficiencyofmodifiedclayCO2-3CO2-3/(mg·L-1)CO2-3/(mg·L-1)/(mg·L-1)HCO-3HCO-3/(mg·L-1)HCO-3/(mg·L-1)/(mg·L-1)20.0012.003.20200.00158.653.2040.0030.003.34400.00305.103.2080.0042.003.34800.00627.293.34100.0072.003.491000.00781.063.64120.0084.003.641200.00901.883.80SO2-4SO2-4/(mg·L-1)SO2-4/(mg·L-1)/(mg·L-1)Cl-Cl-/(mg·L-1)Cl-/(mg·L-1)/(mg·L-1)50.00138.543.6450.0045.733.20100.00252.263.80100.00103.933.34150.00297.093.80150.00146.093.34200.00320.773.97200.00182.543.49300.00496.854.14300.00297.633.64SO2-4,SO2-4。2.2　改性粘土除氟剂对地下水原水的除氟效果,:F-4.900mg/L;Ca2+42.1mg/L;Mg2+14.6mg/L;Fe2+0.07mg/L;Mn2+0.25mg/L;392.8mg/L;HCO-3479.0mg/L;CO2-336.0mg/L;Cl-65.7mg/L;SO2-480.2mg/L。,2.1,:8.0g300mL,3h。,pH6.38,,pH。0.807mg/L,GB5749—2006。2.3　改性粘土除氟剂的再生性能2.3.1　Al2(SO4)3Al2(SO4)31.0∶2.5(,)24h,3,,9。9,Al2(SO4)33.0%,,0.5579mg/g;Al2(SO4)30.3%,0.4331mg/g。,Al2(SO4)39,0.29,,0.3%Al2(SO4)3。2.3.2　Al2(SO4)3　　0.3%·43·　　9　Al2(SO4)3Fig.9　EffectofaluminiumsulfateconcentrationonregenerationefficiencyAl2(SO4)324h,3,,10。10,Al2(SO4)3,,Al2(SO4)31.0∶2.5。10　Al2(SO4)3Fig.10　Effectofsolid-liquidratioonregenerationefficiency2.3.3　0.3%Al2(SO4)31.0∶2.5,3,,11。11,1h,,1h,。11　Fig.11　Influenceofregenerationtimeonregenerationefficiency2.3.4　,0.3%Al2(SO4)31.0∶2.51h,3。0.4331mg/g,99.8%(,pH,2.1.30.4338mg/g)。,2、3,99.8%99.7%,,。3　　(1):0.3mol/LAl2(SO4)32%NaOH1∶3,1.0∶3.0,400℃2h,,0.2168mg/g。(2)Lang-muir,;3h,;8.0g,GB5749—2006;;Ca2+、Mg2+,,SO2-4。(3),:8.0g300mL,3h。0.807mg/L,GB5749-2006。(4):0.3%Al2(SO4)31.0∶2.51h,3。,。:[1]　NAHUMAMC,ROBERTOLR,RAULOP.Adsorptionoffluoridefromwa