College of Environmental Science and Engineering, Donghua University, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Shanghai Institution of Pollution Control and Ecological Security, Shanghai, 201620, China; Departments of Bioengineering, Materials Science and Engineering, University of Illinois at Urbana Champaign, Urbana, IL, 61801, USA; Illinois Sustainable Technology Center, Prairie Research Institute, University of Illinois at Urbana Champaign, Champaign, IL, 61820, USA.
College of Environmental Science and Engineering, Donghua University, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Shanghai Institution of Pollution Control and Ecological Security, Shanghai, 201620, China.
J Environ Manage. 2021 Jul 15;290:112570. doi: 10.1016/j.jenvman.2021.112570. Epub 2021 Apr 22.
Diesel removal of contaminated soil by washing/flushing was enhanced with micro-bubbles and selected surfactants based on their solubilization properties and decontamination capacities. The influencing factors were studied to aim for increasing washing/flushing efficacy. The mixture solution of saponin and cyclodextrin increased the removal efficiency significantly compared to the single-agent solution flushing with an increasing range of 20%-31%. Meanwhile, micro-bubble enhancement increased over 20% of the diesel removal for the sandy soil flushing. As the flushing process may cause soil eroded, the TDS and soil solute in flushing solution were measured to evaluate the circulation time. The 90 min flushing time ensured the cleaning goal and reserved the soil solute by circulation flushing. The soil solute, especially the electron acceptor (NO) , was remained in the soil, which was highly demanded for residual diesel biodegradation of loam soil. It is concluded that mixed agents, circulation of flushing solution, and micro-bubbles increased the diesel removal, and the circulation flushing could be very promising in practical applications.
通过微气泡和选择的表面活性剂增强柴油污染土壤的洗涤/冲洗去除效果，这些表面活性剂基于其增溶性能和去污能力。研究了影响因素，旨在提高洗涤/冲洗效果。与单一试剂冲洗相比，皂素和环糊精的混合溶液显著提高了去除效率，范围增加了 20%-31%。同时，微气泡增强使沙土冲洗的柴油去除率提高了 20%以上。由于冲洗过程可能导致土壤侵蚀，因此测量冲洗溶液中的 TDS 和土壤溶质，以评估循环时间。90 分钟的冲洗时间确保了清洁目标，并通过循环冲洗保留了土壤溶质。土壤溶质，特别是电子受体（NO），保留在土壤中，这对于壤土中残留柴油的生物降解非常重要。结论是，混合试剂、冲洗溶液的循环和微气泡增加了柴油的去除，循环冲洗在实际应用中很有前景。
