活性炭吸附饮用水中卤乙酸的RSSCT试验研究

ADSORPTION OF HALOACETIC ACIDS IN DRINKING WATER ONTO GAC WITH RSSCT

通过RSSCT动态吸附试验,研究了共存卤乙酸组分、空床接触时间(EBCT)、腐殖质对活性炭吸附穿透性能的影响。结果显示:共存卤乙酸组分的存在、EBCT的减小、腐殖质的存在,都使穿透曲线的陡峭性增加、相应穿透点提前、每克活性炭处理水量下降。无论是单组分溶液或混合组分溶液,二氯乙酸比三氯乙酸更容易穿透。与对三氯乙酸的吸附影响相比,减少EBCT对二氯乙酸的吸附更为不利。腐殖质对卤乙酸的吸附存在竟争性吸附的影响,对三氯乙酸的吸附影响比对二氯乙酸大。

Through a rapid small-scale column test （RSSCT） method, the effect of co-existing Haloacetic Acids（HAA）, EBCT and humus on adsorption of HAAs onto granular activated carbon （GAC） was investigated. Experimental results indicated that the existance of co-existing HAA and humus, the decrease in EBCT caused the increase in the slope of breakthrough curve, a forward movement of breakthrough point and the decrease in the volume treated of GAC per g. The breakthrough of Dichloroacetic acid （DCAA） was much faster than trichloroacetic acid （TCAA）. The decrease in EBCT resuited in poorer DCAA reduction than TCAA, while humus presented more considerable effect on breakthrough performance of TCAA than that of DCAA. Humus caused a greater competitive adsorption onto TCAA than DCAA.