焦化废水原水中有机污染物的活性炭吸附过程解析  

Adsorption Process of Organic Contaminant in Untreated Coking Wastewater by Powdered Activated Carbon

作　　者：胡记杰[1] 肖俊霞[1] 任源[1] 谭展机[1] 吴超飞[1] 韦朝海[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广州510006

出　　处：《环境科学》2008年第6期1567-1571,共5页Environmental Science

基　　金：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)

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GC/MS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6 g.L-1,温度30℃,pH=9,反应时间20 min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.The article investigated the removal of organic contaminant from coking wastewater in adsorption process using powdered activated carbon as adsorbent.The dose of activated carbon,temperature,pH and reaction time were studied,and UV-Vis and GC/MS were used to carry out the qualitative and semiquantitative analysis of organic compositions in wastewater.The results showed that the optimum conditions for pretreatment of coking wastewater were 6 g activated carbon per liter,30 ℃,pH=9 and reaction for 20 min,under which the removal efficiency of organic pollutants are more than 70%.Among the 56 kinds of organic compounds,45 kinds such as dolichoalkanes,polynucleation aromatic series,azacyclo compounds could be removed,and the removal ratios of amidobenzene,hydroxybenzene,indoleacetic,acid-2-methyl-phenyl-ester are 63.5%,42.6%,88.1%,28.1% respectively,while cresol and xylenol are more than 70% and 85%.In the adsorption process of multi-composition system in wastewater,macromolecules with low-pole and major ΔG^ 0 as polynuclear aromatic hydrocarbons and azacyclo compounds could be adsorbed preferentially and completely in tacho-absorption period,while micromolecule with hadro-pole and inferior-ΔG^0 as amidobenzene and hydroxybenzene were adsorbed ambly.

关 键 词：焦化废水 有机物 活性炭 吸附过程 

分 类 号：X703.1[环境科学与工程—环境工程]