Method for in-situ remediation of heavy metal contaminated soil
A technology for polluted soil and in-situ remediation, applied in the field of soil remediation, can solve the problems of unstable effect of curing agent, secondary pollution of curing agent, narrow application area, etc., and achieves the effect of low cost, good remediation effect, and reduced absorption
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Embodiment 1
[0022] A method for in situ remediation of heavy metal-contaminated soil in this embodiment comprises the following steps:
[0023] (1) Dilute the modifier with water, the mass ratio of modifier to water is: modifier: water = 1:40;
[0024] (2) Spray the diluted amendment at 200L / mu on the heavy metal-contaminated soil, mix it with the soil, apply it every other month, and apply it continuously for 3 months;
[0025] (3) By weight percentage: 20% montmorillonite powder, 60% attapulgite powder, and 20% raw iron powder are mixed evenly to make curing agent particles with a particle size of 3mm~4mm, and the curing agent particles are mixed with complexing agent citric acid Homogeneously, a mixture is obtained;
[0026] (4) Sow the mixture of curing agent particles and citric acid into the soil repaired by the amendment by mechanical tillage. Wherein, the addition ratio of citric acid is 0.01% of the solidifying agent particle weight, and the volume of the mechanical tillage mix...
Embodiment 2
[0030] A method for in situ remediation of heavy metal-contaminated soil in this embodiment comprises the following steps:
[0031] (1) Dilute the modifier with water, the mass ratio of modifier to water is: modifier: water = 1:40;
[0032] (2) Spray the diluted amendment at 240L / mu on the heavy metal-contaminated soil, mix it with the soil, and apply it every other month for 4 consecutive months;
[0033] (3) By weight percentage: 25% montmorillonite powder, 50% attapulgite powder, and 25% raw iron powder are mixed evenly to make curing agent particles with a particle size of 3mm~4mm, and the curing agent particles are mixed with complexing agent citric acid Homogeneously, a mixture is obtained;
[0034] (4) Sow the mixture of curing agent particles and citric acid into the soil repaired by the amendment by mechanical tillage. Wherein, the addition ratio of citric acid is 0.015% of the solidifying agent particle weight, and the volume of the mechanical tillage mixture is 12...
Embodiment 3
[0038] A method for in situ remediation of heavy metal-contaminated soil in this embodiment comprises the following steps:
[0039] (1) Dilute the modifier with water, the mass ratio of modifier to water is: modifier: water = 1:40;
[0040] (2) Spray the diluted amendment at 280L / mu on the heavy metal-contaminated soil, mix it with the soil, apply it every other month, and apply it continuously for 5 months;
[0041] (3) By weight percentage: 30% of montmorillonite powder, 40% of attapulgite powder, and 30% of original iron powder are mixed evenly to make curing agent particles with a particle size of 3mm~4mm, and the curing agent particles are mixed with complexing agent citric acid Homogeneously, a mixture is obtained;
[0042] (4) Sow the mixture of curing agent particles and citric acid into the soil repaired by the amendment by mechanical tillage. Wherein, the addition ratio of citric acid is 0.02% of the solidifying agent particle weight, and the volume of the mechanic...
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