摘要
采用静态和动态试验研究了活性炭对卤乙酸的物理吸附特性．静态试验表明：在单吸附质条件下，二氯乙酸和三氯乙酸的吸附等温线在低浓度区（ｃｅ＜５０μｇ／Ｌ）表现为单层吸附，在高浓度区表现为多层吸附．活性炭对三氯乙酸的吸附能力高于二氯乙酸．在饮用水处理常见的浓度范围内，活性炭对三氯乙酸的吸附容量约为二氯乙酸的２倍．在多吸附质条件下，对三氯乙酸的吸附容量只略有降低，对二氯乙酸的吸附容量则显著下降，这与有机物的结构特性相符合．动态试验表明：在物理吸附作用下，当进水中二氯乙酸与三氯乙酸的浓度相近时，二氯乙酸为工艺的控制化合物．当进水中２者浓度均为１０μｇ／Ｌ时，活性炭床的穿透时间最长分别为１０９４ｄ和４６２ｄ．现行水厂中运行的活性炭柱吸附饱和分数在９２％以上．
Isotherm tests and column tests were made to study characteristics of adsorption of haloacetic acids (HAAs) by activated carbon.Isotherm tests show that single layer adsorption occurs at low concentration zone(ce<50g/L)under single component system for trichloroacetic acid (TCAA) and dichloroacetic acid(DCAA),while multiple layer adsorption occurs at higher concentration zone.Carbon adsorption capacity for TCAA is higher than for DCAA.In the concentration range usually met in drinking water treatment,adsorption capacity for TCAA is approximately twice as much as for DCAA.Under multicomponent system,adsorption capacity for TCAA drops slightly while the capacity for DCAA drops significantly.The above results consist with structure character of different organic compounds.Column tests show that DCAA is the controlling compound for GAC operation by physical adsorption when influent concentration of TCAA and DCAA are at the same level. When influent concentration of TCAA and DCAA both are 10g/L,the exhaustive times for TCAA and DCAA of the GAC bed used in water treatment are no longer than 1094d and 462d,respectively.The operation efficiency of GAC column is very high and the saturation percent are all above 92%.GAC adsorption in an efficient way to remove HAAs in drinking water.
出处
《环境科学》
EI
CAS
CSCD
北大核心
1999年第5期72-75,共4页
Environmental Science
