Agent for chemical oxidative remediation of pesticide-contaminated soil

Abstract

The invention discloses an agent for chemical oxidative remediation of pesticide-contaminated soil. The agent comprises a component A and a component B. The component A and component B are combined in soil remediation. The component A is sodium persulfate. A use ratio of the component A in the soil is 2 to 15% by mass. The component B contains sodium dodecyl sulfate and calcium hydroxide in a mass ratio of (0.5: 1) to (5: 1). A use mass ratio of calcium hydroxide in the soil is 40-60% a component A use mass ratio. A use mass ratio of sodium dodecyl sulfate in the soil is 2-6%. In agent use, the component B in a dry powder form is added into contaminated soil, then the component A in a dry powder or aqueous solution form is used, soil physical and chemical properties are adjusted, and the soil is subjected to conservation reaction for 3-7 days. The agent can fast and efficiently oxidize, decompose and remove difficult-to-degrade pesticide substances in soil.

Description

Technical field [0001] The invention relates to a pesticide-contaminated soil remediation agent, in particular to a pesticide-contaminated soil chemical oxidation remediation agent. Background technique [0002] my country has always been a large country in the production and use of pesticides. The annual use of pesticides can reach 500,000 to 600,000 tons. There are more than 120 types of pesticides used, most of which are organic pesticides, including organochlorine pesticides, organophosphorus pesticides, and organonitrogen pesticides. During the field application process, most of the pesticides directly enter the soil, and some of the pesticides that volatilize into the atmosphere and sprayed on the crops can also enter the soil through rainwater leaching. [0003] Organochlorine pesticides are a type of persistent organic pollutants that are widely present in various environmental media such as air, water, soil and sediments. They usually have the characteristics of bioaccumul...

AI Technical Summary

Problems solved by technology

The general toxic effects of 666 are nerve and real organ poisons, and large doses can cause serious damage to the central nervous system and some real organs

However, organochlorine pesticides such as BCH are usually hydrophobic organic compounds, such as α-HCH, β-HCH, and γ-HCH, the solubility in water is only 0.2-10 mg / L, and most of the HCH in polluted soil Hexa will be distributed in the solid phase soil particles, but limited in the water phase of the soil

Therefore, in the actual chemical oxidation remediation process, due to the limited water solubility of target pollutants and the adsorption of organic pollutants by soil natural organic matter, it is often difficult for the added oxidizing agent to fully and effectively contact the target organic pollutants, so oxidation The reaction cannot be fully carried out, resulting in a large amount of oxidant dosage and limited repair effect

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