SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2023, Vol. 59 ›› Issue (7): 270-278.DOI: 10.1016/j.cjche.2022.12.005

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Remediation of oily soil using acidic sophorolipids micro-emulsion

Huie Liu, Hongjian Chen, Guanghui Huang, Yunfei Yu, Rujie Li, Shuang Chen   

  1. College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China
  • Received:2021-12-08 Revised:2022-12-04 Online:2023-10-14 Published:2023-07-28
  • Contact: Huie Liu,E-mail:liuhuie@upc.edu.cn
  • Supported by:
    The authors thank the financial support of National Natural Science Foundation of China (22078366) and the supply of the sophorolipids by Shandong Qilu Biotechnology Co., Ltd.

Remediation of oily soil using acidic sophorolipids micro-emulsion

Huie Liu, Hongjian Chen, Guanghui Huang, Yunfei Yu, Rujie Li, Shuang Chen   

  1. College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China
  • 通讯作者: Huie Liu,E-mail:liuhuie@upc.edu.cn
  • 基金资助:
    The authors thank the financial support of National Natural Science Foundation of China (22078366) and the supply of the sophorolipids by Shandong Qilu Biotechnology Co., Ltd.

Abstract: A sophorolipids (SLs) micro-emulsion in Winsor type I form was used for crude oil contaminated soil washing treatment. The micro-emulsion shows higher oil removal rate than SLs aqueous solution and diesel oil. The type I micro-emulsion with w(SLs) = 6%, w(NaCl) = 1%, w(diesel) = 13.36% gave a high oil removal rate of 95.6% and the eluate remained in type I state. The recovered oil showed lower viscosity, mainly caused by the entering of diesel from the micro-emulsion phase into the oil phase and the lower removal rate of the heavier components, such as the resin and asphaltene. The initial heavily saline-alkaline soil changed into mildly saline-alkaline state after washing treatment, favoring the germination and growth of plants, with ryegrass showing better germination and growth effect than alfalfa. The ryegrass showed good phytoremediation effect on the contaminated soil after SLs micro-emulsion washing. The combination process of SL micro-emulsion washing and ryegrass phytoremediation is prospective for oily soil treatment.

Key words: Sophorolipids, Winsor type I micro-emulsion, Washing, Saline-alkaline soil, Plant germination and growth

摘要: A sophorolipids (SLs) micro-emulsion in Winsor type I form was used for crude oil contaminated soil washing treatment. The micro-emulsion shows higher oil removal rate than SLs aqueous solution and diesel oil. The type I micro-emulsion with w(SLs) = 6%, w(NaCl) = 1%, w(diesel) = 13.36% gave a high oil removal rate of 95.6% and the eluate remained in type I state. The recovered oil showed lower viscosity, mainly caused by the entering of diesel from the micro-emulsion phase into the oil phase and the lower removal rate of the heavier components, such as the resin and asphaltene. The initial heavily saline-alkaline soil changed into mildly saline-alkaline state after washing treatment, favoring the germination and growth of plants, with ryegrass showing better germination and growth effect than alfalfa. The ryegrass showed good phytoremediation effect on the contaminated soil after SLs micro-emulsion washing. The combination process of SL micro-emulsion washing and ryegrass phytoremediation is prospective for oily soil treatment.

关键词: Sophorolipids, Winsor type I micro-emulsion, Washing, Saline-alkaline soil, Plant germination and growth