Soil freeze-thaw cycle simulation device and NAPL phase migration quantitative identification method

Abstract

The invention discloses a soil freeze-thaw cycle simulation device and an NAPL phase migration quantitative identification method. The device comprises a freeze-thaw cycle temperature control module, an NAPLs migration and transformation simulation tank, a water and soil parameter monitoring module and a shooting module. The freezing and thawing cycle temperature control module is used for controlling the temperature of the NAPLs migration and transformation simulation tank and the environment where the NAPLs migration and transformation simulation tank is located; the NAPLs migration and transformation simulation tank is arranged in a temperature control cabinet of the freeze-thaw cycle temperature control module, is a place where NAPLs migrate in soil, and is monitored by the water and soil parameter monitoring module so as to realize automatic monitoring and output of each index in an experiment process; the shooting module is used for shooting NAPLs distribution after dyeing in the experiment, so that the dynamic distribution characteristics of the NAPLs can be quantitatively determined through picture analysis subsequently. The device is simple in structure, convenient to use, good in repeatability and capable of achieving lossless, real-time and quantitative monitoring of component distribution of the NAPLs in the soil in the freezing and thawing process.

Description

technical field [0001] The invention relates to the technical field of soil research, in particular to a soil freeze-thaw cycle simulation device based on temperature control and a NAPL phase migration quantitative identification method based on the device. Background technique [0002] Seasonal permafrost regions are widely distributed around the world, accounting for about 30% of the total land area in the northern hemisphere, and more than half of the country's land area in my country. The main oil resource producing areas in northern my country are all distributed in seasonally frozen soil areas. The data from the National Soil Pollution Survey Bulletin (2014) shows that the excess rate of pollutants at monitoring points in oil production areas in my country exceeds 20%, and the main pollutants are Petroleum hydrocarbons in the form of NAPLs have the characteristics of toxicity to the human body such as "Three Consistency" and persistence of threats to the ecological envi...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned patents, not only complex and cumbersome device design, complex structure, expensive price, inconvenient operation, long experimental cycle and poor repeatability are required, but also the interference of ice relative to experimental data is not considered, and non-destructive, real-time And quantitatively monitor the distribution of soil pollutant components during the freeze-thaw process

[0004] It can be seen that the above-mentioned existing research on the distribution and migration of NAPLs under soil freeze-thaw cycles still has inconvenience and defects in terms of equipment structure, methods and use, and needs to be further improved.

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