Abstract
Funnel and gate permeable reactive barrier (FGPRB) is an effective method to treat groundwater pollution. In order to clarify the impact of FGPRB on groundwater dynamic conditions, this study takes a site pilot test as the research object and establishes an FGPRB downstream of a petrochemical industry. The results show that the concentrations of 1,2-dichloroethylene and benzene in the downstream groundwater, after setting FGPRB, are lower than the detection limit. The numerical simulation results show that after setting FGPRB, both point source and area source pollution can achieve a good delay effect, extending from about 27 d to about 65 d of response time, but changing the thickness and permeability coefficient has no obvious effect on the delay effect. The tracer test shows the average permeability coefficient of the medium from the injection well to the monitoring well after the construction of FGPRB decreases from 77.0 m/d to 31.2 m/d after the construction of FGPRB. The average seepage velocity from the injection well to the monitoring well decreased from 0.19 m/d to 0.078 m/d after the construction of FGPRB. At the same time, when the FGPRB is not built, the maximum concentration time from the injection well to the monitoring well is about 10 d. After the FGPRB is constructed, the maximum concentration time of the tracer received by the monitoring well is about 27 days. These results confirm that the establishment of FGPRB will change the hydrodynamic conditions of groundwater and delay the response time of pollutants in the monitoring well.
Highlights
Introduction iationsPetroleum refining usually refers to the distillation and separation of crude oil to obtain various products used in our daily life; it plays a significant role in the growth of the national economy [1]
After completion of Funnel and gate permeable reactive barrier (FGPRB), groundwater samples were planned for mid-month to clarify the concentration changes of pollutants in groundwater
The concentrations of 1,2-dichloroethylene and benzene in monitoring wells R1, R2 and R3 in FGPRB and downstream monitoring wells D1, D2, D3, D4 and D5 were low, and the detection data show that they were lower than the detection limit most of the time
Summary
Petroleum refining usually refers to the distillation and separation of crude oil to obtain various products used in our daily life; it plays a significant role in the growth of the national economy [1]. Accidents in the production process usually lead to the pollution of soil and groundwater [2,3]. There are many kinds of chemical products involved in petroleum refineries, including total petroleum hydrocarbons (TPH), halogenated hydrocarbons, polycyclic aromatic hydrocarbons (PAHs), benzene series (BTEX), etc. Most of the products are in-process enterprises, so once pollution occurs, it is very difficult to control. In the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization, petroleum refining is in the list of class 2A carcinogens [5]. The treatment of petroleum pollutants is necessary to human health
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