Method for degrading pollutants in soil by catalyzing oxidation of chlorine dioxide through boron-activated ferrous ions

Abstract

The invention relates to a method for degrading pollutants in soil by catalyzing oxidation of chlorine dioxide through boron-activated ferrous ions, which comprises the following steps of: mixing a chlorine dioxide solution as an oxidizing agent, a Fe < 2 + > solution as a catalytic agent and boron as an activating agent with polluted soil, and carrying out degradation and remediation treatment. Compared with the prior art, the invention provides a method for catalyzing oxidation of chlorine dioxide to degrade polycyclic aromatic hydrocarbon in polluted soil by using a catalyst with Fe < 2 + > as an active component and using boron as an activating agent. In the catalysis process, the activating agent boron can reduce the catalyzed Fe < 3 + > into Fe < 2 + > to continue to participate in catalysis, Fe < 2 + > circulation is realized, the reaction rate is increased, and the catalysis efficiency is improved. The Fe < 2 + >-based catalyst with high content in the soil and boron which is very important to the soil are used, so that the soil is improved without adding new ions into the soil, the soil is not subjected to secondary pollution, and the soil is cleaner.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and relates to a method for boron-activated ferrous ions to catalyze chlorine dioxide to oxidize and degrade pollutants in soil. Background technique [0002] With the development of industry, a large number of organic pollutants, polycyclic aromatic hydrocarbons, are enriched in industrial soils, and the pollution is becoming more and more serious and urgently needs to be repaired. Polycyclic aromatic hydrocarbons (PAHs) are persistent organic pollutants with "three-effects" that are emitted in large quantities and are difficult to degrade. With the relocation of factories, a large amount of polycyclic aromatic hydrocarbon-contaminated soil is exposed, and people and animals are exposed to the soil environment containing polycyclic aromatic hydrocarbons for a long time, life and health will be seriously threatened. [0003] At present, PAH-contaminated soil remediation tec...

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Problems solved by technology

Among them, physical remediation technologies mainly include steam extraction, supercritical extraction, thermal desorption, etc. Physical methods are used to remove or isolate organic pollutants, but their shortcomings are obvious. First of all, the cost is high, and the pollutants have not really been eliminated. , and the treated soil will be destroyed, and it is difficult to reuse the biological land; chemical remediation technology refers to the use of chemical reactions to convert organic pollutants in the soil into low-toxic or non-toxic substances. This type of remediation technology is currently in the scope of application The most extensive technology; bioremediation technology refers to the transfer, adsorption or degradation of pollutants through the metabolic activities of plants or microorganisms. This type of remediation technology is low in cost, but it is greatly affected by soil quality and environmental factors, and it is difficult to degrade high-concentration contaminated soil , sometimes the degradation products are more toxic than the original pollutants

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