Thermal remediation device for in-situ remediation of volatile organic contaminated soil and thermal remediation method

Abstract

The invention discloses a thermal remediation device for in-situ remediation of volatile organic contaminated soil and a thermal remediation method. The thermal remediation device is formed by overlaying a plurality of meshed ring-shaped heating units; a power connection unit is arranged at the upper end of each meshed ring-shaped heating unit; and a lead is mounted at the center of each power connection unit and used for being connected with a power supply system. The heating units of the thermal remediation device can be automatically converted to the thermal conduction heating mode with dependence on the own resistance temperature rise, and then the trouble of the dry well phenomenon can be avoided; during the period, moisture and volatile organic matters in soil around the heating units can be vaporized through radiation and conduction methods, the vaporized moisture and volatile organic matters can be separated from the soil finally, and then the purpose of remediation can be fulfilled; and meanwhile, compared with the heating process of an electrode plate, the thermal remediation device disclosed by the invention has the advantage of being simple and low in cost.

Description

technical field [0001] The invention belongs to the technical field of volatile organic contaminated soil remediation, and more particularly relates to a thermal remediation device and a thermal remediation method for in-situ remediation of volatile organic contaminated soil. Background technique [0002] Since the 1990s, my country's cities have begun to shrink the secondary industry and develop the tertiary industry, leaving a large amount of polluted land left in the city to be treated, and soil remediation is urgent. [0003] Among the many polluted sites, the organic pollution sites left over from the history of chemical plants have the most serious negative impacts. The organic matter volatilized from the polluted soil poses a serious threat to the health, ecological environment and social stability of the surrounding residents due to its high toxicity and irritating odor. Therefore, the treatment of organically polluted soil has become a hot topic in the field of env...

AI Technical Summary

Problems solved by technology

In the prior art, current heating repair devices mostly use electrode plates. During the treatment process, it is very easy to irreversibly transform due to the decrease in the moisture content of the electrode well wall soil, resulting in poor electrical conductivity, and ultimately unable to rise to the target temperature to achieve the repair goal.

Especially when the soil is heated above 100°C, a large amount of water on the soil surface will evaporate and the conductivity will decrease. In this case, traditional heating technology can only alleviate the problem of well wall drying by replenishing water.

However, due to the difference in water replenishment time and the difficulty of fully infiltrating the well wall with replenishing water, the well wall will gradually dry out irreversibly, and eventually the interwell current will be difficult to heat the soil, resulting in poor restoration effect

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