Chemical oxidation remediation method for organism-contaminated soil and remediation device

Abstract

The invention relates to a chemical oxidation remediation method for organism-contaminated soil and a remediation device. The device comprises an oxidant pot, a catalyst pot, a chelating agent pot, aflexible pipe, an electric valve, a control apparatus, a valve switch, a pump, a flow valve, a reactor, a stirrer, a stirrer switch, a sealing cover, a liquid inlet pipe, an exhaust pipe, a gas-liquidseparating apparatus and a tail gas treating apparatus. The method comprises the following steps: placing contaminated soil into the reactor; firstly injecting 0.03-0.4mol / (kg soil) of citric acid into the reactor through the chelating agent pot; then adding 0-0.4mol / (kg soil) of catalyst ferrous sulfate in the catalyst pot, and adding water to be dissolved to prepare 0.5mol / l of catalyst; injecting the catalyst into the reactor by the pump; pumping 1-2mol / (kg soil) of oxidant hydrogen peroxide into the reactor; and fully stirring the three preparations and the contaminated soil by the stirrer in the reactor to oxidize and degrade polycyclic aromatic hydrocarbon in the soil, and the removal rate of pollutants in the soil exceeds 80 percent. The invention has high efficiency on organics-contaminated soil remediation and can not cause secondary pollution to the soil.

Description

technical field [0001] The invention relates to a chemical oxidation repair method and equipment for organic polluted soil, which belongs to the technical field of environmental engineering and can be applied to polycyclic aromatic hydrocarbons, benzene series, petroleum hydrocarbons, organic pesticides, organic Treatment of solid media such as solvents and other types of organic polluted soil. Background technique [0002] With the rapid development of the chemical industry, more and more organic pollutants have entered the soil and groundwater environment. Pollutants that are difficult to be biodegraded will remain in the environment for a long time and continue to migrate and transform, bringing great hidden dangers . In particular, some chemical plants leak a large amount of organic pollutants due to leakage and other reasons, resulting in extremely high concentrations of organic pollutants in soil and groundwater. These pollutants are constantly migrating and transfor...

AI Technical Summary

Problems solved by technology

[0006] The technology of the present invention solves the problem: when utilizing hydrogen peroxide and ferrous ions to oxidize organically polluted soil, hydrogen peroxide is easily decomposed, and ferrous ions are easily oxidized and precipitate under neutral conditions. The chelating agent citric acid, on the one hand, ensures that the pH is around 3, inhibits the decomposition of hydrogen peroxide, and prevents ferrous ions from forming a precipitate, and forms a chelate with ferrous ions, slowly releases ferrous ions, and improves the oxidation resistance of oxidants to pollutants. removal efficiency

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