焦化废水原水中有机污染物的活性炭吸附过程解析_胡记杰

焦化废水原水中有机污染物的活性炭吸附过程解析胡记杰,肖俊霞,任源,谭展机,吴超飞,韦朝海＊(华南理工大学环境科学与工程学院,广州510006)摘要:以焦化废水原水作为研究对象,采用粉末活性炭作为吸附剂,考察活性炭投加量、温度、pH及反应时间对废水中主要有机污染物去除的影响规律,结合UV-Vis吸收光谱及GCMS对吸附过程中有机物组分的变化进行定性和半定量分析.结果表明,在最佳反应条件即活性炭投加量6g·L-1,温度30℃,pH=9,反应时间20min的情况下处理废水有机物去除率大于70%,原水中检测出的56种有机物中的45种被去除,如长链烷烃、多环芳香族及氮杂环化合物等的浓度降至检测限以下,剩余的11种有机物中苯胺、苯酚、吲哚、乙酸-2-甲基苯酯的去除率分别达到63.5%、42.6%、88.1%、28.1%,甲苯酚(邻、间)和二甲苯酚(5种)去除率在70%和85%以上.结果分析表明,多组分有机污染物共存体系的焦化废水活性炭吸附过程中,多环芳香族和氮杂环等弱极性且-ΔG0较大的大分子有机物优先被吸附且吸附容量大,构成了快速吸附过程;而苯胺、苯酚等强极性且-ΔG0较小的小分子单苯环有机物则表现为弱吸附过程.关键词:焦化废水;有机物;活性炭;吸附过程中图分类号:X703.1文献标识码:A文章编号:0250-3301(2008)06-1567-05收稿日期:2007-06-06;修订日期:2007-09-21基金项目:国家高技术研究发展计划(863)项目(2006AA06Z378);国家自然科学基金项目(50278036)作者简介:胡记杰(1982～),男,硕士研究生,主要研究方向为水污染控制,E-mail:jijiehu@163.com＊通讯联系人,E-mail:cechwei@scut.edu.cnAdsorptionProcessofOrganicContaminantinUntreatedCokingWastewaterbyPowderedActivatedCarbonHUJi-jie,XIAOJun-xia,RENYuan,TANZhan-ji,WUChao-fei,WEIChao-hai(CollegeofEnvironmentalScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510006,China)Abstract:Thearticleinvestigatedtheremovaloforganiccontaminantfromcokingwastewaterinadsorptionprocessusingpowderedactivatedcarbonasadsorbent.Thedoseofactivatedcarbon,temperature,pHandreactiontimewerestudied,andUV-VisandGCMSwereusedtocarryoutthequalitativeandsemiquantitativeanalysisoforganiccompositionsinwastewater.Theresultsshowedthattheoptimumconditionsforpretreatmentofcokingwastewaterwere6gactivatedcarbonperliter,30℃,pH=9andreactionfor20min,underwhichtheremovalefficiencyoforganicpollutantsaremorethan70%.Amongthe56kindsoforganiccompounds,45kindssuchasdolichoalkanes,polynucleationaromaticseries,azacyclocompoundscouldberemoved,andtheremovalratiosofamidobenzene,hydroxybenzene,indoleacetic,acid-2-methyl-phenyl-esterare63.5%,42.6%,88.1%,28.1%respectively,whilecresolandxylenolaremorethan70%and85%.Intheadsorptionprocessofmulti-compositionsysteminwastewater,macromoleculeswithlow-poleandmajor-ΔG0aspolynucleararomatichydrocarbonsandazacyclocompoundscouldbeadsorbedpreferentiallyandcomp