Method for repairing and upgrading soil

Abstract

The invention discloses a method for repairing and upgrading soil. The method comprises the steps of soil thermal analysis, and pyrolysis and gasification, incineration and combustion of biomass straw. The biomass straw respectively generates a pyrolysis gas and charcoal, and a gasified gas and activated carbon through pyrolysis and gasification; to-be-repaired soil generates a thermal analysis gas and purified soil after thermal analysis treatment; the thermal analysis gas directly burns to generate hot smoke and provides heat for thermal analysis in a direct heat exchange manner; the analyzed soil is returned to participate in pyrolysis reaction and then mixed with the pyrolysis product charcoal to upgrade while the thermal analysis gas is subjected to decomposition reaction in a high-temperature environment formed by the gasified gas in a combustion manner; the generated high-temperature smoke provides heat and gasified medium for the gasification reaction, and then the smoke is discharged to the atmosphere after the pollutant is absorbed and removed through the activated carbon. By adopting the method, cyclic utilization of the product and gradient utilization of energy in the soil repairing and upgrading processes are achieved, the method has the advantages of being free of pollution, compact in equipment structure and the like, and an energy source is saved.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control, and in particular relates to a soil restoration and quality improvement method. Background technique [0002] Soil is an organic part of the ecological environment system and the most important and basic comprehensive natural resource for human survival and development. However, with the rapid development of my country's industrialization, unreasonable mining of mineral resources and their smelting discharge, long-term soil irrigation and sludge application, atmospheric deposition caused by human activities, and application of chemical fertilizers and pesticides have caused soil pollution. serious pollution. At present, my country is one of the countries with the most serious soil pollution in the world. According to the data released by the Ministry of Environmental Protection in 2006, my country's polluted cultivated land is about 150 million mu, accounting for 8.3% of the 1.8 b...

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Problems solved by technology

[0006] Purpose of the invention: In order to solve the problems existing in the prior art, the present invention proposes a soil remediation method to solve the problem that a large amount of heat needs to be consumed in the conventional soil thermal analysis repair process, and the fertility of the repaired soil decreases due to the decrease in pH value, resulting in The pyrolysis gas contains polluting organic substances, which can easily cause secondary pollution and other problems.

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