鼠李糖脂对底泥三氯生脱附的影响因素

发布时间：2018-07-26 12:40

【摘要】：采用吸附/脱附平衡实验考察了温度对鼠李糖脂作用下三氯生(TCS)在底泥/水中分配的影响,以及鼠李糖脂浓度、泥水比、反应时间、TCS初始浓度对鼠李糖脂脱附底泥中TCS的影响;并通过Box-Behnken响应曲面法(RSM)确定了鼠李糖脂强化脱附底泥中TCS的影响因素排序、最佳脱附条件和调控策略。结果表明,在283~323 K的温度范围内,温度越高,TCS越容易向水相迁移;鼠李糖脂浓度越大、泥水比越低、时间越长、TCS初始浓度越低,越有利于鼠李糖脂脱附TCS。各影响因素作用排序为:泥水比鼠李糖脂浓度pH时间;最佳脱附条件:鼠李糖脂浓度2 996.96 mg·L~(-1)、泥水比10 g·L~(-1)、反应时间30 h及pH 7.9。此时,鼠李糖脂对底泥中TCS的最大脱附率可达90.70%。可为鼠李糖脂生物表面活性剂强化受TCS污染水体的原位修复的可行性提供判据。
[Abstract]:The effects of temperature on the distribution of trichlorogenic (TCS) in sediment / water under the action of rhamnolipid, and the effects of the concentration of rhamnolipid, the ratio of mud to water, the initial reaction time and the initial concentration of TCS on the desorption of rhamnolipid were investigated by adsorption / desorption equilibrium experiment. Box-Behnken response surface method (RSM) was used to determine the order of influencing factors, the optimal desorption conditions and the control strategies of TCS in the desorption sediment. The results show that the higher the temperature is, the easier it is to migrate to water, the higher the concentration of rhamnolipid is, the lower the ratio of mud to water is, the lower the initial concentration of TCS is, the longer the time is, the more favorable TCSs are to the desorption of rhamnolipid. The optimal desorption conditions were: rhamnolipid concentration 2 996.96 mg L ~ (-1), mud water ratio 10 g L ~ (-1), reaction time 30 h and pH 7.9. The maximum desorption rate of rhamnolipid to TCS in sediment was 90.70. Rhamnolipid biosurfactant can provide a criterion for the feasibility of in situ remediation of water polluted by TCS.
【作者单位】：华南理工大学环境与能源学院;工业聚集区污染控制与生态修复教育部重点实验室;
【基金】：国家自然科学基金资助项目(21277050)
【分类号】：X52

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