Simulating device for soil vapor extraction technique

Abstract

The invention discloses a simulating device for a soil vapor extraction technique. The simulating device for the soil vapor extraction technique comprises a three-dimensional test sand box, a vapor extraction device connected with the sand box, and a charcoal immobilization inoculums adding device. The vapor extraction device comprises an air injection pump, a flowmeter, an air injection well, an extraction well, an activated carbon filter and a vacuum pump. The charcoal immobilization inoculums adding device comprises a pressurizing injection pump and an injection well. The invention further provides the charcoal immobilization inoculums adding device and the three-dimensional test sand box. By the adoption of the simulating device, a soil vapor extraction test, a charcoal immobilization inoculums degradation test and a vapor extraction simulation test strengthen through charcoal immobilization inoculums can be conducted under a homogeneous or heterogeneous soil layer condition; various parameters which mainly include the aeration flow, the extraction flow, the vacuum degree and the like can be monitored in real time during the tests; meanwhile, sampling measurement can be conducted on soil samples or gas samples in different positions in a soil layer at different stages of the tests, and thus the repairing effect of the soil vapor extraction technique strengthen through the charcoal immobilization inoculums on a contaminated site can be determined.

Description

technical field [0001] The invention relates to the technical field of soil treatment, and more particularly to an experimental device for soil gas phase extraction, in particular to a simulation device for research on the removal of VOCs by soil gas phase extraction technology. Background technique [0002] Soil vapor phase extraction technology is a soil remediation technology for volatile organic compounds, which is simple to operate, low in cost and does not damage the soil structure. However, there are some shortcomings in the soil gas phase extraction technology. There is a tailing period in its application. The concentration of volatile and semi-volatile pollutants in the initial soil drops rapidly. As time goes by, the residual pollutants in the soil do not directly contact with the incoming gas. , but slowly diffused into the soil pores through the water film, and then discharged out of the system with the airflow, the contribution of volatilization to remove pollut...

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Problems solved by technology

However, there are some shortcomings in the soil gas phase extraction technology. There is a tailing period in its application. The concentration of volatile and semi-volatile pollutants in the initial soil drops rapidly. As time goes by, the residual pollutants in the soil do not directly contact with the incoming gas. , but slowly diffused into the soil pores through the water film, and then discharged out of the system with the airflow, the contribution of volatilization and removal of pollutants gradually weakened, the concentration of pollutants in the soil basically no longer decreased, and the ventilation repair entered the late stage of trailing

[0003] Some scholars proposed to combine soil gas phase extraction technology with high-efficiency bacterial degradation. The results show that the addition of bacterial agents is very effective for the removal of residual VOCs in soil. However, the current indoor simulation experiments mostly stay at the research stage of small soil columns. How to add Efficient degradation of bacteria and effective verification of their effects are the difficulties of this type of experiment

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