System for repairing contaminated soil by thermal leaching with solar energy

Abstract

The invention discloses a system for repairing contaminated soil by thermal leaching with solar energy, which comprises a solar heating system, an auxiliary heating system, an in-situ leaching systemand a waste gas and waste liquid treatment system, and is characterized in that the solar heating system comprises a leacheate preparation tank, a solar heat collection plate and a leacheate storage tank, and a vacuum tube heater is arranged in the solar heat collection plate; the prepared leacheate is heated through a vacuum heating pipe and then enters the leacheate storage tank, the auxiliary heating system comprises a heating rod and a control device and plays a role in auxiliary heating of the leacheate, the in-situ leaching system comprises a heatable injection well, a multiphase extraction well and a heat preservation layer, the leacheate is injected into soil through the injection well, and the multiphase extraction well is communicated with the heat preservation layer. After the leacheate reacts with the polluted soil for a period of time, the multiphase extraction well extracts the waste leacheate containing the organic pollutants to a waste gas and waste liquid treatment system. The contaminated soil remediation efficiency is high, solar energy can be fully utilized, environmental protection and energy conservation are achieved, and the advantages of thermal desorption and in-situ leaching can be combined.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a system for using solar energy to perform thermal leaching and remediation of polluted soil. Background technique [0002] In-situ leaching technology can inject leaching agent into the soil without soil excavation, so that heavy metals or organic pollutants can be eluted from the soil. Common leaching agents for soil organic pollutants include surfactants, organic solvents, etc.; common leaching agents for soil heavy metal pollution include strong acids, artificial chelating agents, etc. The in-situ leaching technique has the advantages of being convenient and can be implemented on a large scale, but when the in-situ leaching is used alone, its repair efficiency is low, the time is long, and the repair effect is poor. In order to improve the remediation efficiency, composite remediation technology is often used at present, which combines thermal desorptio...

AI Technical Summary

Problems solved by technology

In-situ leaching technology has the advantages of convenience and wide-scale implementation, but when in-situ leaching is used alone, its repair efficiency is low, the time is long, and the repair effect is poor

In order to improve the remediation efficiency, composite remediation technology is often used at present, combining thermal desorption method with chemical leaching technology to improve the remediation efficiency of soil organic matter. Complicated issues

Images