反应条件对颗粒活性炭吸附亚氯酸盐的影响

净水技术2020,39(1):98-103WaterPurificationTechnology扫我试试?易娟,宋庆,卢小艳,等.反应条件对颗粒活性炭吸附亚氯酸盐的影响[J].净水技术,2020,39(1):98-103.YIJ,SONGQ,LUXY,etal.Effectofreactionconditionsonadsorptionofchloritebygranularactivatedcarbon[J].WaterPurificationTechnology,2020,39(1):98-103.反应条件对颗粒活性炭吸附亚氯酸盐的影响易娟1,宋庆2,卢小艳1,黄河洵1(1.深圳市水务〈集团〉有限公司,广东深圳518031;2.哈尔滨工业大学深圳研究生院,广东深圳518055)摘要采用烧杯试验探讨了水溶液中颗粒活性炭(GAC)对亚氯酸盐(ClO-2)的去除特点。结果表明:GAC投加量越大,去除率越高;当投加比大于1∶1、反应120min时,去除率可达100%;ClO-2初始浓度小于5mg/L时,受GAC表面与溶液中ClO-2浓度差的影响,ClO-2去除率随初始浓度增加而迅速升高;在pH的影响下,会改变GAC表面的电性,酸性条件下带正电,促进GAC对ClO-2的去除,反之碱性条件下抑制ClO-2的去除;GAC吸附ClO-2为自发吸热的物理吸附反应,温度低于20℃时受温度影响较大,温度在20℃以上时,几乎不影响ClO-2去除效果;搅拌强度对ClO-2去除基本不产生影响,只需要GAC与ClO-2充分接触即可;粒度主要影响去除速率,充分反应的条件下,粒度对ClO-2去除效果影响较小。关键词颗粒活性炭氯酸盐去除率吸附反应条件中图分类号:TU991.2文献标识码:A文章编号:1009-0177(2020)01-0098-06DOI:10.15890/j.cnki.jsjs.2020.01.017EffectofReactionConditionsonAdsorptionofChloritebyGranularActivatedCarbonYIJuan1,SONGQing2,LUXiaoyan1,HUANGHexun1(1.ShenzhenWaterAffairs〈Group〉Co.,Ltd.,Shenzhen518031,China;2.ShenzhenGraduateSchool,HarbinInstituteofTechnology,Shenzhen518055,China)AbstractThefeaturesofgranularactivatedcarbon(GAC)adsorptionofchlorite((ClO-2)inaqueoussolutionwasstudiedthroughjartest.ResultsshowedthathigherchloriteremovalratewasincreasedbyGACdosage,andreached100%after120minwhendosingratiowasgreaterthan1:1.Wheninitialconcentrationofchloritewaslessthan5mg/L,chloriteremovalratewasincreasedrapidlywiththeriseofinitialchloriteconcentrationduetoClO-2concentrationdifferencebetweenGACsurfaceandsolution.ElectricalpropertiesofGACsurfacewouldbechangedunderdifferentpHconditions,chloriteremovalratewaspromotedunderacidicconditionasGACsur-facewaspositivelycharged,anddecreasedunderalkalinecondition.GACadsorptionofchloritewasspontaneousendothermicphysicalreaction.Adsorptioneffectwasgreatlyaffectedbelow20℃,whereasitdidnothaveinfluenceabove20℃.Chloriteremovalratewouldnotbeaffectedbystirringintensity.Particlesizeexhibitednosignificanteffectonchloriteremovalrate,butonlyinfluencedad-sorptionefficiency.Keywordsgranular