A method of using industrial iron powder to remediate halogenated hydrocarbon polluted soil
A technology for polluted soil and halogenated hydrocarbons, which is applied in the restoration of polluted soils, etc., can solve the problem that it is difficult to effectively remove the zero-valent iron passivation layer, the high-activity zero-valent iron is difficult to effectively release, and the removal effect of halogenated hydrocarbon pollutants is limited. and other problems, to achieve the effect of reducing repair cost, fast reaction rate and high efficiency
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Embodiment 1
[0021] Collect carbon tetrachloride (80mg / kg) contaminated soil from a pesticide factory in Tianjin. Heat the contaminated soil to 60°C to inhibit the activity of endogenous microorganisms in the soil. Add thermophilic iron-reducing bacteria, biochar-iron powder composite material, and tap water to the polluted soil, the amount of biochar-iron powder composite material added is 0.5% of the soil mass, and the mixer stirs to make the biochar-iron powder composite material , Thermophilic iron-reducing bacteria are fully mixed with soil particles. Nutrients (that is, medium) are then injected to make the thermophilic iron-reducing bacteria fully active, and the biochar-iron powder composite fully reacts with carbon tetrachloride in the soil for 3 days, thereby reducing carbon tetrachloride. After the implementation of this embodiment, the carbon tetrachloride content in the soil dropped to 0.5mg / kg. After the repair is completed, the soil temperature is restored, the growth of e...
Embodiment 2
[0025] Collect carbon tetrachloride (80mg / kg) contaminated soil from a pesticide factory in Tianjin. Heat the contaminated soil to 60°C to inhibit the activity of endogenous microorganisms. Add thermophilic iron-reducing bacteria, biochar-iron powder composite material, and tap water to the polluted soil, the amount of biochar-iron powder composite material added is 0.3% of the soil mass, and the stirrer stirs to make the biochar-iron powder composite material , Thermophilic iron-reducing bacteria are completely mixed with soil particles. Nutrients are injected and the stirrer stirs to make the thermophilic iron-reducing bacteria fully active. The biochar-iron powder composite fully reacted with carbon tetrachloride in the soil for 5 days, thereby reducing carbon tetrachloride. After the present embodiment was implemented, the carbon tetrachloride content in the soil dropped to 7mg / kg. After the repair is completed, the soil temperature is restored, the growth of exogenous ...
Embodiment 3
[0029] Collect a certain trichlorethylene (94mg / kg) polluted soil. Heat the contaminated soil to 55°C to inhibit the growth of endogenous microorganisms. Add thermophilic iron-reducing bacteria, biochar-iron powder composite material, and tap water to the polluted soil, the amount of biochar-iron powder composite material added is 0.5% of the soil mass, and the mixer stirs to make the biochar-iron powder composite material , Thermophilic iron-reducing bacteria are completely mixed with soil particles. Nutrients are injected and the stirrer stirs to make the thermophilic iron-reducing bacteria fully active, and the biochar-iron powder composite fully reacts with the trichlorethylene in the soil for 4 days, thereby reducing trichlorethylene. After the implementation of this example, the content of trichlorethylene in the soil was reduced to 9mg / kg. After the repair is completed, the soil temperature is restored, the growth of exogenous microorganisms is inhibited, and the orig...
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