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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Embodiment 1
[0027] For organic pollutants with good water solubility, the oxidative degradation experiment of ZVI / EDTA / Air system was carried out by using the simulated contaminated kaolin prepared by ourselves as the experimental object. The pH of the simulated contaminated soil was 5.68, and the concentration of 2,4-DCP was 488mg / kg. The mass ratio of ZVI and organic contaminated soil in the reaction system was 1:4, and the ratio of organic contaminated soil mass (g) to the volume of aminocarboxylic acid complexing agent solution (mL) was 1:40. Take 10g of contaminated soil, 2.5g of zero-valent iron powder in 400mL of EDTA solution with a concentration of 2mmol / L, put it in a reaction vessel, use a magnetic stirrer to stir the mud evenly at a speed of 1000rpm, use an air pump to pump air in and pass the flow rate The meter adjusts the flow rate to 1L / min, and starts the reaction at normal temperature and pressure (30°C, 1atm). The results showed that the degradation rate of DCP and EDT...
Embodiment 2
[0029] For water-soluble 2,4-dichlorophenol (2,4-DCP) contaminated simulated kaolin, different aminocarboxylic acid complexing agents (ethylenediamine disuccinic acid, EDDS) were used to carry out the ZVI / EDDS / Air system Oxidative degradation experiments. The concentration of 2,4-DCP in contaminated soil was 233mg / 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 aminocarboxylic acid complexing agent solution volume (mL) was 1:5. Add 100g of simulated polluted soil and 500ml of EDDS aqueous solution with a concentration of 0.01mmol / L into the slurry reactor, and add 2g of iron powder at the same time. The reaction was started under normal temperature and pressure (30°C, 1 atm). After 3 hours of reaction, the degradation rate of DCP in the soil was 93.4%, and the degradation rate of EDDS was 91.4%. After 3.5 hours of reaction, the DCP in the system was completely degraded, and the de...
Embodiment 3
[0031]For the hydrophobic organic contaminated soil, the organic pesticide contaminated 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 with pH 6.38 and organic matter content of 0.85%. 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 the mass (g) of organic contaminated soil to the volume (mL) of aminocarboxylic acid complexing agent solution was 1:8. Add 50g of polluted soil and 400ml of aqueous solution into the slurry reactor, the concentration of EDTA in the aqueous solution is 0.2mmol / L, add 2.5g of iron powder at the same time, use a magnetic stirrer to stir the slurry at a speed of 800rpm, and use an air pump to pump in air. The flow rate was controlled at 1 L / min by a fl...
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