腐殖酸钠和表面活性剂对黄土中石油污染物解吸增溶作用

选用十二烷基苯磺酸钠(LAS)、十二烷基硫酸钠(SDS)和十二烷基磺酸钠(SAS)对污染的土壤进行解吸实验,研究了这3种阴离子表面活性剂和腐殖酸钠对黄土中柴油类污染物的协同增溶作用.结果表明,腐殖酸钠和3种阴离子表面活性剂对黄土中柴油的解吸均有显著增溶作用,使柴油的解吸量明显增加,柴油的去除率最高可达63%.SDS对柴油的解吸量随腐殖酸钠浓度增大呈线性增加关系;但腐殖酸钠浓度增加对 LAS和SAS的解吸曲线有突越点,超过此浓度后反而会抑制解吸作用.

Desorption enhancement of diesel by humic sodium and surfactants in loess soil

The present paper aims to introduce the authors' experiment on how to remove the diesel contaminant from the loess soil by using the surfactant solutions and humic sodium. In our experiment, we have adopted three anionic surfactants (LAS, SDS and SAS) to analyze their removing power of diesel from the contaminated loess soil. The experiments have shown that diesel contaminants can be synergistically dissolved and absorbed by the three anionic surfactants. The removing power can be as high as up to 63% at a range of anionic surfactant solution from 0.1% to 1.0%. With the increase of humic sodium concentration, the removing efficiency can be well linearly increased by using SDS. However, SAS and LAS had a point of reflection on the adsorption curve when the concentration of humic sodium rise. Therefore, there may exist some inhibiting effect of SAS and LAS on the removing rate of diesel contaminant if the surfactant concentration is over the point.