不同表面活性剂溶液冲洗油污土壤的对比试验研究

选择不同表面活性剂浓度、冲洗流速及运行方式为影响因素,以冲洗有效孔隙体积数相同时累积冲出油量为考核目标,进行阴离子表面活性剂十二烷基苯磺酸钠(LAS)和非离子表面活性剂TritonX-100冲洗油污土柱正交试验对比研究。结果表明:在同样的冲洗试验条件下,LAS的冲洗流速明显小于TritonX-100;在同样的冲洗有效孔隙体积下,LAS冲出油的总量相对较多,但冲洗所需时间相对较长;根据正交试验极差分析结果,影响LAS冲洗效果的主要因素是运行方式,影响TritonX-100冲洗效果的主要因素则是冲洗浓度。

Contrast Test on Removal of Diesel from Polluted Soil by Two Surfactants

Surfactant flushing(SF)technology is a relatively new technology for removing organic liquids from the subsurface environment.The contrast test focused on removal of diesel from polluted soil columns by surfactant flushing.Anionic surfactant-LAS and nonionic surfactant-Triton X-100 were employed.Soil columns uniformly polluted by diesel were flushed according to orthogonal table involving three factors:surfactant concentration,flushing velocity and running manners(continuous or periodic operation).Levels of surfactant concentration were determined by the results of solubility experiments and magnitudes of flushing velocity were determined by changing the elevation between water level of surfactant solution and outlet of soil column.The results showed that at the same experimental conditions,LAS showed bigger flushing velocity than Triton X-100;LAS could removal more diesel from polluted soil column but need more time than Triton X-100 when cumulative effective void volume flushed by surfactants was same,and according to range analysis based on the results of orthogonal experiment,running manners was the key factor that determined removal of diesel by LAS,but the key factor of Triton X-100 was surfactant concentration.