活性炭去除水中余氯的研究.pdf

张怀旭等活性炭去除水中余氯的研究

活性炭去除水中余氯的研究

张怀旭1刘婉冬1李冰1张巍1常启刚1应维琪1#刘友良2
(1.华东理工大学资源与环境工程学院,上海200237;2.上海活性炭厂有限公司,上海201111)

摘要通过对5种不同活性炭的去除余氯量实验、余氯穿透实验以及化学反应产物Cl-的质量平衡数据,探讨了活性炭去除
余氯的性能和机制。活性炭去除余氯是吸附与化学反应共同作用的结果。活性炭与水中余氯接触后的初期,去除余氯以吸附作用
为主;达到吸附平衡后,余氯浓度继续下降则是由于化学反应的作用。接触时间越长、余氯初始浓度越高、pH较低,活性炭去除余
氯量越大。由Cl-的生成量可以确定化学反应去除余氯量是余氯总去除量的一部分;接触时间越长,活性炭剂量越大,化学反应去
除余氯量占余氯总去除量的比例越高。使用粒径<180目活性炭进行余氯去除实验,吸附容量在1～2h即达到饱和。活性炭对余
氯吸附量(2h的余氯去除量)的大小与其苯酚值排行相同。苯酚值及碘值较高的煤质炭与余氯有较强的化学反应,果壳炭其次,而
椰壳炭的化学性相对稳定。
关键词活性炭余氯去除物理吸附化学反应

ActivatedcarbontreatmentforremovingresidualfreechlorineinwaterZhangHuaixu1,LiuWandong1,Li
Bingjing1,ZhangWei1,ChangQigang1,YingWeichi1,LiuYouliang2.(1.SchoolofResourceandEnvironmental
Engineering,EastChinaUniversityofScienceandTechnology,Shanghai200237;2.ShanghaiActivatedCarbon
Co.,Ltd.,Shanghai201111)
Abstract:Aseriesofexperimentswereperformedtocomparethedechlorinationeffectivenessof5activatedcar2
bonsinbatchreactorsbycontactrunsandcarboncolumnbreakthroughruns.Theremovaloffreechlorinewasaccom2
plishedbyphysicaladsorptionandchemicalreaction;adsorptionwasthemainremovalmechanisminitiallywhile
chemicalreactionwasresponsibleforcontinuingtheremovaloffreechlorineafteradsorptionequilibriumhadbeenes2
tablished.Removaloffreechlorinewasenhancedby:alongercontacttime,ahigherinitial/influentfreechlorinecon2
centration,andalowerpH.Thereleaseofchlorideionsdemonstratedtheroleofthechemicalreactionthatobserved
freechlorineremoval.Using<180meshparticlesofactivatedcarboninmixedbatchreactors,thecarbon'sadsorptive
capacityforfreechlorinewasestablishedquickly(<2h);thecarbons'capacitiesforfreechlorinewereinthesameor2
derastheirphenolnumbers.Thecoalbasedactivatedcarbonwithhighphenolandiodinenumberswasmostreactive
withfreechlorine,followedbythefruitshellandcoconutshellbasedcarbons.Muchmorefreechlorinewasremoved
inbothlabsizeandfullsizecarboncolumnsbasedonthecarbon’sadsorptivecapacity.
Keywords:activatedcarbon;chlorineresidual;removing;physicaladsorption;chemicalreaction

水中氯的来源主要是自来水厂或污水处理厂出式中:C3为活性炭自由基;C3O为