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以La为目标污染物,通过鼠李糖脂淋洗土壤试验,考察鼠李糖脂对La的淋洗效果及溶液pH影响,以淋洗前后不同形态稀土元素含量变化为基础,分析淋洗剂对La的稳定性和流动性的影响。结果表明:鼠李糖脂对土壤中稀土元素吸附能力较弱,最佳淋洗pH为6.9,最大淋洗效率为10.24%,相同条件下Cu,Zn的最大淋洗效率分别为67.75%和18.33%。淋洗剂pH值对淋洗效果的影响较大,考察的3个pH值中淋洗剂pH为6.9时淋洗效果最佳。多次淋洗有助于提高La的淋洗效率,最大累积效率为17.76%。当淋洗剂pH=10时,多次淋洗累积效率为7.42%,由于淋洗剂为碱性,使得体系中氧化结合态稀土元素的含量不断升高,该条件下稀土元素稳定性指数MF相对其他条件最大提高了33.67%,有助于稀土元素在土壤中的固化。
Taking La as the target pollutant, the rhamnolipid leaching soil was used to test the rinsing effect of rhamnolipid on La and the effect of pH on the solution. Based on the changes of the content of rare earth elements in different forms before and after rinsing, Effect on the stability and liquidity of La. The results showed that rhamnolipid could adsorb rare earth elements in soil very weakly. The optimum leaching pH was 6.9 and the maximum leaching efficiency was 10.24%. Under the same conditions, the maximum leaching efficiencies of Cu and Zn were 67.75% and 18.33 %. The effect of pH value of eluent on the elution effect is great. When the pH value of eluent is 6.9, the elution efficiency is the best. Multiple leaching helps to improve La rinsing efficiency with a maximum cumulative efficiency of 17.76%. When the eluent pH = 10, the cumulative efficiency of multiple leaching was 7.42%. Because the eluent was alkaline, the content of rare earth elements in the system increased continuously. Under the conditions, the stability index of rare earth element MF Compared with other conditions, the maximum increase of 33.67%, contribute to the solidification of rare earth elements in the soil.