Alamooti Amir, Colombano Stéfan, Omirbekov Sagyn, Ahmadi Azita, Lion Fabien, Davarzani Hossein
BRGM (French Geological Survey), Orléans 45000, France; Institut de Mécanique et Ingénierie de Bordeaux (I2M), Arts et Métiers Institute of Technology, CNRS, Talence 33405, France; ADEME (Agence de la transition écologique), ANGERS, 49004, France.
BRGM (French Geological Survey), Orléans 45000, France.
J Hazard Mater. 2022 Oct 15;440:129702. doi: 10.1016/j.jhazmat.2022.129702. Epub 2022 Aug 2.
Nowadays the remediation of DNAPL contaminated zones near groundwater has gained great prominence in environmental fields due to the high importance of water resources. In this work, we suggest injecting a densified polymer suspension by adding barite particles to displace DNAPL. To evaluate the efficiency of the densification of polymer suspensions on the displacement of DNAPL, various densities of barite-polymer suspension; lower, equal, and higher than the density of DNAPL were prepared and their rheological behavior was analyzed. Then flow experiments were performed using a decimetric-scale 2D tank. The displacement procedure was monitored with an imaging technique and the production and injection process data were recorded by mass balance interpretation. It was shown that the densification of the polymer suspension could improve the displacement efficiency of DNAPL up to four times. The clogging behavior of barite-polymer suspension was assessed in a 1D column. Generalized Darcy's law and the continuity equation were used to numerically simulate the experimental two-phase flow. To take into account the clogging behavior of the suspension, the transport equation of diluted species was implemented into the model. The simulation results show that the model can properly predicts the experimental consequences.
如今，由于水资源的高度重要性，地下水附近DNAPL污染区域的修复在环境领域备受关注。在这项工作中，我们建议通过添加重晶石颗粒来注入致密化的聚合物悬浮液，以置换DNAPL。为了评估聚合物悬浮液致密化对DNAPL置换的效率，制备了各种密度的重晶石 - 聚合物悬浮液，其密度低于、等于和高于DNAPL的密度，并分析了它们的流变行为。然后使用分米级二维水箱进行流动实验。用成像技术监测置换过程，并通过质量平衡解释记录生产和注入过程数据。结果表明，聚合物悬浮液的致密化可将DNAPL的置换效率提高四倍。在一维柱中评估了重晶石 - 聚合物悬浮液的堵塞行为。使用广义达西定律和连续性方程对实验两相流进行数值模拟。为了考虑悬浮液的堵塞行为，将稀释物种的传输方程纳入模型。模拟结果表明，该模型能够正确预测实验结果。
