A method for chemical oxidation enhanced chemical leaching to remediate heavy metal polluted soil
A technology of polluted soil and chemical leaching, which is applied in the field of chemical oxidation and chemical leaching, can solve the problems of failing to meet the standard and low elution rate, and achieve the effect of improving leaching efficiency and reducing ecological risks.
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Embodiment 1
[0020] Collect the soil around a mining area 1 in a certain place, and measure its basic physical and chemical properties: cadmium: 1.34mg / kg, lead: 383mg / kg, zinc: 313mg / kg, pH=6.1, air-dry the collected soil at room temperature, and sieve The soil with a particle size between 60 mesh and 200 mesh should be fully stirred evenly;
[0021] (1) Weigh 10g of soil into a 250ml Erlenmeyer flask, add 50ml of 0.5mol / L Na 2 EDTA aqueous solution, adjust the pH to 4 with 0.1mol / L HCl, shake at room temperature at a horizontal shaking speed of 200rpm for 50min, centrifuge, and separate the soil and eluate;
[0022] (2) Add 50ml of 0.5mol / L Na 2 EDTA aqueous solution, adjust the pH to 4 with 0.1mol / L HCl, shake at room temperature at a horizontal shaking speed of 200rpm for 50min, centrifuge, and separate the soil and eluate;
[0023] (3) Add 50 ml of deionized water to the re-centrifuged soil, shake at room temperature at a horizontal shaking speed of 200 rpm for 1 hour, and centrifug...
Embodiment 2
[0025] Collect the soil around a mining area 1 in a certain place, and measure its basic physical and chemical properties: cadmium: 1.34mg / kg, lead: 383mg / kg, zinc: 313mg / kg, pH=6.1, air-dry the collected soil at room temperature, and sieve The soil with a particle size between 60 mesh and 200 mesh should be fully stirred evenly;
[0026] (1) Weigh 10g of soil and put it into a 250ml Erlenmeyer flask, add 50ml of Fenton's reagent aqueous solution (the prepared concentration is 24g / L FeSO 4 ·7H 2 O, 200ml / L H 2 o 2 , with 0.1mol / L C 6 h 8 o 7 Adjust the pH to 3), shake at room temperature for 50 minutes at a horizontal shaking speed of 200 rpm, centrifuge, and separate the soil and eluate;
[0027] (2) Add 50ml of 0.5mol / L Na to the centrifuged soil 2 EDTA aqueous solution, adjust the pH to 4 with 0.1mol / L HCl, shake at room temperature at a horizontal shaking speed of 200rpm for 50min, centrifuge, and separate the soil and eluate;
[0028] (3) Add 50 ml of deionized wa...
Embodiment 3
[0031]Collect the soil around a mining area 1 in a certain place, and measure its basic physical and chemical properties: cadmium: 1.34mg / kg, lead: 383mg / kg, zinc: 313mg / kg, pH=6.1, air-dry the collected soil at room temperature, and sieve The soil with a particle size between 60 mesh and 200 mesh should be fully stirred evenly;
[0032] (1) Weigh 10g of soil into a 250ml Erlenmeyer flask, add 100ml of 0.5mol / L Na 2 EDTA aqueous solution, adjust the pH to 5 with 0.1mol / L HCl, shake at room temperature at a horizontal shaking speed of 200rpm for 1h, centrifuge, and separate the soil and eluate;
[0033] (2) Add 100ml of 0.5mol / L Na 2 EDTA aqueous solution, adjust the pH to 5 with 0.1mol / L HCl, shake at room temperature at a horizontal shaking speed of 200rpm for 1h, centrifuge, and separate the soil and eluate;
[0034] (3) Add 100 ml of deionized water to the re-centrifuged soil, shake at room temperature at a horizontal shaking speed of 200 rpm for 1 hour, and centrifuge to...
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