Influence of the injection of densified polymer suspension on the efficiency of DNAPL displacement in contaminated saturated soils

Alamooti A. Colombano S. Omirbekov S. Ahmadi A. Lion F. Davarzani H.
15 October 2022 Elsevier B.V.

Journal of Hazardous Materials
2022 #440

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 Darcys 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.

Clogging , Densification , DNAPL , Polymer suspension , Two-phase flow

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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
Nazarbayev University, 53 avenue Qabanbay Batyr, Nur-Sultan, 010000, Kazakhstan

BRGM (French Geological Survey)
Institut de Mécanique et Ingénierie de Bordeaux (I2M)
ADEME (Agence de la transition écologique)
Nazarbayev University

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