Heavy metal cadmium and lead composite polluted soil restoration agent and preparing method thereof
A soil remediation agent and composite pollution technology, which is applied in the field of heavy metal cadmium lead composite contaminated soil remediation agent and its preparation, can solve the problems of nutrient element loss, soil structure damage, and low repair efficiency, and achieve increased adsorption capacity, easy adsorption, The effect of high adsorption value
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Embodiment 1
[0034] The test soil was collected from a heavy metal-polluted area, and the heavy metal content in the soil surface of this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:
[0035] (a), take a sample from the soil, and detect the concentration of heavy metals in the soil before remediation by using an overturning oscillator to perform a leaching test on the soil according to the solid waste "Leach Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007);
[0036] (b) Preparation of soil remediation agent: use the mixture of straw and calcium oxide as raw material, the mass ratio of straw and calcium oxide is 20:1, and heat it in vacuum under the conditions of system pressure of 20kPa and pyrolysis temperature of 500°C Decompose for 30 minutes, and the particle size obtained by grinding is biochar powder below 3mm; prepare powdered diatomite, ferro...
Embodiment 2
[0050] The test soil was collected from a heavy metal-polluted area, and the heavy metal content in the soil surface of this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:
[0051] (a), take a sample from the soil, and detect the concentration of heavy metals in the soil before remediation by using an overturning oscillator to perform a leaching test on the soil according to the solid waste "Leach Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007);
[0052] (b) Preparation of soil remediation agent: use the mixture of straw and calcium oxide as raw material, the mass ratio of straw and calcium oxide is 20:1, and heat it in vacuum under the conditions of system pressure of 20kPa and pyrolysis temperature of 500°C Decompose for 30 minutes, and the particle size obtained by grinding is biochar powder below 3mm; prepare powdered diatomite, ferro...
Embodiment 3
[0066] The test soil was collected from a heavy metal-polluted area, and the heavy metal content in the soil surface of this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:
[0067] (a), take a sample from the soil, and detect the concentration of heavy metals in the soil before remediation by using an overturning oscillator to perform a leaching test on the soil according to the solid waste "Leach Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007);
[0068] (b) Preparation of soil remediation agent: use the mixture of straw and calcium oxide as raw material, the mass ratio of straw and calcium oxide is 20:1, and heat it in vacuum under the conditions of system pressure of 20kPa and pyrolysis temperature of 500°C Decompose for 30 minutes, and the particle size obtained by grinding is biochar powder below 3mm; prepare powdered diatomite, ferro...
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