摘要
采用颗粒活性炭(GAC)对饮用水消毒副产物卤乙酸中的三氯乙酸(TCAA)和二氯乙酸(DCAA)的吸附特性进行了研究和对比。研究结果表明:在单底质条件下,活性炭对卤乙酸的吸附等温线最符合修正的Freundlich方程,浓度小于200μg/L时,活性炭对卤乙酸基本表现为单层吸附。活性炭投加量为1600mg/L时,GAC对TCAA和DCAA的去除率分别达到98.49%和98.01%。活性炭对TCAA的吸附能力高于DCAA,当平衡浓度为0.3μmol/L时,其对二者的摩尔吸附容量比为1.17∶1。酸性条件下有利于活性炭吸附卤乙酸。多底质共存条件下,两种卤乙酸之间存在竞争吸附,与单底质条件下相比,活性炭对TCAA的吸附受影响程度低于DCAA。同时吸附速率比较表明活性炭对DCAA的吸附速率较快。
The adsorption characteristics of granular activated carbon （GAC） to two kinds of HAAs in drinking water was investigated and contrasted, It was mentioned that the adsorption isotherm of HAAs is best fit to the amendatory Freundlieh equation under single component system. At concentration of HAAs below 200μg/L, when the dosage of GAC is 1 600 mg/L, removals of 98.49 % and 98. 01% for trichloroacetic acid （TCAA） and dichloroacetic acid （DCAA） respectively were obtained, The adsorption capacity for TCAA is larger than that for DCAA, the mol adsorption capacity for TCAA is 1.17 times as much as for DCAA at the mol equation concentration of 0.3 μmol/L. It＇ s better for GAC adsorption of HAAs in the acidic condition. Under multi-component system, there were competition for adsorption between different kinds of HAAs, compared with the case under monocomponent system the influence on adsorption capacity for TCAA is slighter than DCAA, the above mentioned results consist with structure character of different organic compounds. At the same time, the adsorption rate was contrasted to show that the adsorption rate for DCAA is rather high.
出处
《给水排水》
CSCD
北大核心
2005年第12期5-10,共6页
Water & Wastewater Engineering
基金
国家高技术研究发展计划(863)资助项目(2002AA601130)
国家科技攻关计划重大项目(2003BA808A17)
关键词
颗粒活性炭
卤乙酸
饮用水
吸附等温线
Granular activated carbon （GAC）
Haloacetic acids
Drinking water
Adsorption isotherm
