黄土中石油污染物的协同增溶作用研究

研究了腐殖酸钠以及阴离子表面活性剂十二烷基苯磺酸钠(LAS)和十二烷基硫酸钠(SDS)在单独使用及混合溶液体系去除黄土中柴油的解吸效应,探讨了振荡时间、腐殖酸钠质量浓度、pH值等因素对柴油解吸的影响.实验结果表明,两种阴离子表面活性剂对黄土中的柴油都有很好的解吸效果.投加LAS质量浓度为1.0g/L和10.0g/L后的柴油解吸质量浓度分别达到44.934 mg/L和915.171 mg/L,解吸量分别是同等实验条件下清水作用的1.7倍和34.4倍.投加SDS的质量浓度为10.0 g/L后,柴油解吸率也会比清水振荡解吸增大22.3倍.加入单一腐殖酸钠的质量浓度为1g/L时,柴油的最大解吸量是清水冲洗时的5.3倍.腐殖酸钠(0.2g/L)和LAS(8g/L)混合溶液体系对柴油的解吸量是单独使用LAS解吸量的2.4倍,腐殖酸钠(0.2g/L)-SDS(8 g/L)体系的最大解吸量是单独使用SDS解吸量的2.6倍.在pH值为8.6的条件下,腐殖酸钠-LAS混合溶液体系对柴油的解吸量达到最大值.

Study on coordinative enhanced-solubilization of petroleum contaminants in loess soil

The present paper is focused on the study of the desorption of diesel oil from the loess soil by using surfactants sodium dodecylbenzen sulfonate(LAS),sodium dodecyl sulphate(SDS)and humic sodium while investigating the influential factors, such as shaking time, concentrations of humic sodium and pH values. Compared with the individual utilization of the two anionic surfactants,the significant desorption efficiencies for LAS were found as 1.7 and 34.4 times higher than the fresh water. When SDS concentration of 10.0 g/L is added, the desorption efficiency could be increased 22.3 times higher than the fresh water. However, when humic sodium solution of 1 g/L is used isolately, the desorption efficiency would be just 5.3 times higher than that of the fresh water. Due to the efforts of humic sodium on the coordinative enhanced-solubilization of the surfactants, the mixing solution of humic sodium(0.2 g/L) and LAS(8 g/L) could increase the diesel desorption from the loess soil by 2.4 times in comparison with the relevant LAS solution alone while the mixing solution of humic sodium(0.2 g/L) and SDS (8 g/L) could correspondently increase 2.6 times. The mixing solution of humic sodium and LAS thus can reach the optimal value of diesel desorption from the soil at pH 8.6.