Restoration method for organic contaminated soil
A technology of organic pollution and remediation method, applied in the field of soil remediation, can solve the problems of inconvenient storage and transportation, achieve the effect of solving inconvenient storage and transportation, no secondary pollution, and fast repair effect
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[0026] Example 1:
[0027] For organic pollutants with good water solubility, the simulated contaminated kaolin prepared with 2,4-dichlorophenol (2,4-DCP) was used as the experimental object to conduct the oxidative degradation experiment of ZVI / EDTA / Air system. The pH of the simulated contaminated soil was 5.68, and the concentration of 2,4-DCP was 488 mg / kg. The mass ratio of ZVI and organic polluted soil in the reaction system was 1:4, and the ratio of organic polluted soil mass (g) to aminocarboxylic acid complexing agent solution volume (mL) was 1:40. Take 10g of polluted soil and 2.5g of zero-valent iron powder in 400mL of EDTA solution with a concentration of 2mmol / L, put it in a reaction vessel, stir the mud evenly with a magnetic stirrer, the rotation speed is 1000rpm, use an air pump to pump air and pass the flow rate The flow rate was adjusted to 1 L / min, and the reaction was started under the conditions of normal temperature and pressure (30 °C, 1 atm). The resul...
Example Embodiment
[0028] Embodiment 2:
[0029] For water-soluble 2,4-dichlorophenol (2,4-DCP) contaminated simulated kaolin, using different aminocarboxylic acid complexing agents (ethylenediaminedisuccinic acid, EDDS), the ZVI / EDDS / Air system was tested. Oxidative degradation experiments. The concentration of 2,4-DCP in the contaminated soil was 233 mg / kg. The mass ratio of ZVI and organic contaminated soil in the reaction system was 1:50, and the ratio of organic contaminated soil mass (g) to the volume of aminocarboxylic acid complexing agent solution (mL) was 1:5. 100g of simulated contaminated soil and 500ml of EDDS aqueous solution with a concentration of 0.01mmol / L were added to the mud reactor, and 2g of iron powder was added at the same time, and the air aeration rate was 1L / min. The reaction was started at normal temperature and pressure (30 °C, 1 atm). After 3 hours of reaction, the degradation rate of DCP in soil was 93.4%, and that of EDDS was 91.4%. After 3.5 hours of reaction...
Example Embodiment
[0030] Embodiment three:
[0031]For the hydrophobic organic polluted soil, the organic pesticide polluted soil collected from the former site of a pesticide factory in Wujiang City, Jiangsu Province, China was used as the experimental object. The soil is silty clay loam, pH 6.38, 0.85% organic matter, hexachloride, 4,4'-DDE, 2,4'-DDD, 4,4'-DDD, 4,4'- The concentrations of DDT and total DDT were 64.2 mg / kg, 4.58 mg / kg, 82.4 mg / kg, 295 mg / kg, 987 mg / kg and 1369 mg / kg, respectively. The mass ratio of ZVI and organic contaminated soil in the reaction system was 1:20, and the ratio of organic contaminated soil mass (g) to the volume of aminocarboxylic acid complexing agent solution (mL) was 1:8. 50g of contaminated soil and 400ml of aqueous solution were added to the slurry reactor. The concentration of EDTA in the aqueous solution was 0.2mmol / L. At the same time, 2.5g of iron powder was added. The slurry was stirred with a magnetic stirrer at a rotational speed of 800rpm. The f...
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