Bionic remediation method for heavy metal contaminated soil
A technology of polluted soil and remediation method, which is applied in the restoration of polluted soil, etc., can solve the problems of heavy burden, low efficiency, and long time consumption of waste biological disposal, and achieve the goal of less waste residue generation, less reagent consumption, and less damage Effect
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Embodiment 1
[0025] Weigh 1g of copper-contaminated soil, wherein the copper content is 34.6mg. Under stirring at 20°C, first add 25 mL of an aqueous solution containing 2% citric acid. Afterwards, adjust the pH of the mixed system to 3-4, wash and soak for 24 hours under stirring. Then, let it stand, and filter and separate the soil and the copper-containing supernatant washing solution. After that, 25 mL of aqueous solution containing 2% citric acid was added for secondary soaking and extraction. Then, let it stand, and filter and separate the soil and the copper-containing supernatant washing solution again. After testing, the residual copper content in the soil after treatment is less than 30mg / kg. After treatment, the soil was adjusted to pH 6-7 with dipotassium hydrogen phosphate solution, and returned to the field.
[0026] At 5-10°C, add 0.13g of ferric nitrate and 0.8g of potassium dihydrogen phosphate to the copper-containing upper washing solution, and adjust the pH to 6-7 w...
Embodiment 2
[0028] Weigh 1g of nickel-contaminated soil, which contains 22.9mg of nickel. Add 30 mL of an aqueous solution containing 1% tartaric acid at 50°C under stirring, then adjust the pH of the system to 4-5, wash and soak for 24 hours while stirring. Then, let it stand, and filter and separate the soil and the nickel-containing supernatant washing solution. After testing, the residual nickel content in the soil after treatment is less than 20mg / kg. The soil was adjusted to pH 6-7 with potassium bicarbonate solution.
[0029] At ~15°C, add 3.9g of ferric sulfate and 0.05g of calcium phosphate to the nickel-containing upper washing liquid, and adjust the pH to 8~9 with sodium carbonate. After standing still, after filtering and separating the nickel-containing precipitate and the upper water phase, the residual nickel content in the water phase was detected to be 0.1mg / L. After the water phase is supplemented with a small amount of nitric acid to pH 4-5, it is recycled for washin...
Embodiment 3
[0031] Weigh 1g of copper-contaminated soil, wherein the copper content is 34.6mg. Under stirring at 40°C, 20 mL of an aqueous solution containing 2.5% potassium sodium tartrate was added. Afterwards, adjust the pH of the mixed system to 5-6, wash and soak for 24 hours under stirring. Then, let it stand, filter and separate the soil and the upper copper-containing washing solution. After testing, the residual copper content in the soil after treatment is less than 30mg / kg. The soil was adjusted to pH 6-7 with ammonium carbonate solution.
[0032]At ~40°C, add 0.2g of ferrous sulfate heptahydrate and 0.5g of phosphoric acid to the copper-containing washing solution on the upper layer, and adjust the pH to 7~8 with calcium oxide. After standing still, the copper-containing precipitate and the upper water phase were separated by filtration, and the residual copper content in the water phase was detected to be 0.05 mg / L. After the aqueous phase is supplemented with a small amo...
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