Method for repairing cadmium-lead composite polluted calcareous soil
A technology for calcareous soil and compound pollution, applied in the field of heavy metal pollution soil remediation, can solve the problems of secondary pollution, long remediation period, easy damage to soil structure, etc., and achieves the effect of maintaining stability and reducing heavy metal content
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Embodiment 1
[0028] Embodiment 1: remediation of cadmium-lead compound polluted calcareous soil
[0029] Weigh 5Kg of contaminated soil in Dongdagou, Baiyin City, Gansu Province, crush it to less than 2cm, put it into a 15-liter plastic container, and add 1KgAl 2 (SO 4 ) 3 18H 2 O and 200g polyferric sulfate (PFS), after mixing evenly, add 10LH 2 O, stir, let stand for 1d, and collect the filtrate by filtration. Determination of Cd and Pb content in soil and filtrate. Filtrate with 10% Ca(OH) 2 Adjust the pH to 9.0, add 5ml / L 0.1% polyacrylamide (PAM) and stir, let stand for 1h, filter, and reuse the filtrate. The contents of DTPA-extracted Cd and Pb in the soil were reduced from 5.82mg / kg and 89.15mg / kg to 0.93mg / kg and 18.31mg / kg respectively, and the removal rate of DTPA-extracted Cd was 84%. The removal rate of elevated Pb was 79%.
Embodiment 2
[0030] Example 2: Remediation project of cadmium-lead compound polluted soil in Dongdagou, Baiyin City, Gansu Province
[0031] The polluted farmland soil in Dongdagou, Baiyin City, Gansu Province was crushed to less than 2cm with a rotary tiller, and the crushed soil was built into a mound with a thickness of less than 20cm, and a plastic film was spread underneath to prevent leakage; Al, which accounted for 18% of the soil mass, was added 2 (SO 4 ) 3 18H 2 O and polyferric sulfate (PFS) accounting for 8% of the soil quality, fully mix the soil and the agent with a rotary tiller, add the Yellow River irrigation water according to twice the soil quality, and stir to make the agent fully dissolve and react with the surface of the soil particles , after reacting for 1 day, drain and collect the supernatant. Use 10% Ca(OH)2 in the supernatant to adjust the pH to 9.0, add 5ml / L 0.1% polyacrylamide (PAM) to stir, let it stand for 1h, filter the sludge, collect the filtrate, and ...
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