Combined microwave oxidation compound repair system and method aiming at organic arsenic pollution in soil

Abstract

The invention belongs to the technical fields of soil repair and environmental friendliness and in particular relates to a combined microwave oxidation compound repair system and method aiming at organic arsenic pollution in soil. The repair system comprises a microwave thermal desorption system, a soil oxidation system and a waste gas treatment system. The method comprises the following steps: allowing the polluted soil to enter the microwave thermal desorption system, adding a catalyst, performing heating, microwave radiation and thermal desorption treatment, volatilizing most of pollutants in the soil into a gas state for emission, discharging the soil through a discharge opening in the microwave thermal desorption system and performing subsequent treatment; transferring a gas state matter into the bottom of oxidation equipment, and carrying out a strong oxidation reaction on an arsenic-containing organic matter to generate a stable arsenic-containing compound; further degrading the treated gas to reach the standard through an activated sludge tank, and discharging the treated gas into the atmosphere; and allowing the soil to enter an oxidation reaction pool, and feeding the soil into recovery equipment through an oxidation effect of oxidation liquid. According to the system and method, the soil subjected to organic arsenic pollution can be completely and effectively repaired, the soil can be recovered and repaired and is recycled, the waste gas is treated, and an environmental protection standard is reached.

Description

technical field [0001] The invention belongs to the field of soil remediation technology and the field of environmental protection technology, and specifically relates to a combined microwave oxidation composite repair system and method for soil organic arsenic pollution. Background technique [0002] In recent years, soil pollution has attracted more and more attention from the industry. The soil environment directly affects the development of the national economy and the safety of land resources and the environment, and more closely affects agricultural products and human health. Organic arsenic in soil is an important component of soil pollution. In recent years, in addition to chemical and agricultural sources, pollution caused by abandoned chemical weapons in the Japanese war of aggression against China after World War II has also become one of the important factors of soil pollution. Investigations have shown that chemical weapons abandoned by Japan have been found in ...

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Problems solved by technology

[0003] At present, the remediation methods for arsenic-containing organic matter in soil are relatively simple, especially for the pollution caused by chemical weapons. The measures taken in most areas of my country are mainly excavation and landfill methods, and there is no thorough and effective solution.

my country's soil pollution remediation technology has thermal desorption technology, that is, heating the polluted soil. Due to the different boiling points of the pollutants and the soil, the pollutants become volatilized gases, so as to achieve the purpose of separating the pollutants from the soil. This method is relatively inefficient and consumes a lot of energy

[0004] In addition, microwave technology is also currently used to remediate contaminated soil. Microwave treatment of contaminated soil is achieved through two mechanisms: coupling molecular rotation and ion conduction. Molecules move through ion migration and polar molecule rotation, but not The internal structure of the molecule is changed, so as to achieve the purpose of separating the pollutants from the soil, but the effect of microwave technology on the treatment of refractory organic compounds is not good, so the simple microwave method also has a certain unsatisfactory effect on the remediation of contaminated soil.

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