Removing method for heavy metal Cr and/or Hg in soil
A heavy metal and soil technology, applied in the field of soil heavy metal pollution control, to achieve the effect of strengthening migration and transformation, realizing transformation, easy to master and popularization
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Embodiment 1
[0042] 1) Soak Salix sawdust in 10% (v / v) acetic acid solution for 2 hours according to the solid-to-liquid ratio of 1mg:5mL, then take out the sawdust and immerse it in 1% (v / v) sodium hydroxide solution until the sawdust becomes Neutral, take out the wood chips and dry them in an oven at 95°C, then pass through a 1mm sieve and set aside;
[0043] 2) Through monitoring, determine the area polluted by heavy metal Cr and Hg and the content of Cr and Hg in the soil in this area, sow Salix salix with good growth and health and a plant height of 10cm, with an interval of 0.8m between the plants and a distance of 30cm underground from the plants. Sprinkle the sawdust in (1) in the soil in the region with a horizontal distance of 20cm from the root system, with a thickness of 1mm.
[0044] 3) After the Salix salix matures under suitable natural conditions, all the plants are harvested, crushed and then enzymatically saccharified to produce bioethanol, the residue is concentrated and...
Embodiment 2
[0049] 1) Soak Salix sawdust in 15% (v / v) acetic acid solution for 2.5 hours according to the solid-to-liquid ratio of 1mg: 6mL, then take out the sawdust and immerse it in 2% (v / v) sodium hydroxide solution until the sawdust It is neutral, take out the sawdust and dry it in an oven at 98°C, then pass it through a 1.2mm sieve for later use;
[0050] 2) Through monitoring, determine the area polluted by heavy metal Cr and Hg and the content of Cr and Hg in the soil in this area, sow Salix salix with good growth and health and a plant height of 20cm, with an interval of 1.0m between the plants and a distance of 35cm underground from the plants. Sprinkle the sawdust in (1) in the soil in the region with a horizontal distance of 25cm from the root system, with a thickness of 1-5mm.
[0051] 3) After the Salix salix matures under suitable natural conditions, all the plants are harvested, crushed and then enzymatically saccharified to produce bioethanol, the residue is concentrated ...
Embodiment 3
[0056] 1) Soak Salix sawdust in 20% (v / v) acetic acid solution for 3 hours according to the solid-to-liquid ratio of 1mg:7mL, then take out the sawdust and immerse it in 3% (v / v) sodium hydroxide solution until the sawdust is Neutral, take out the sawdust and dry it in an oven at 101°C, then pass it through a 1.6mm sieve for later use;
[0057] 2) Through monitoring, determine the area polluted by heavy metal Cr and Hg and the content of Cr and Hg in the soil in this area, sow Salix salix with good growth and health and a plant height of 30cm, with an interval of 1.1m between the plants and a distance of 40cm underground from the plants. Sprinkle the sawdust in (1) in the soil in the region with a horizontal distance of 30cm from the root system, with a thickness of 3mm.
[0058] 3) After the Salix salix matures under suitable natural conditions, all the plants are harvested, crushed and then enzymatically saccharified to produce bioethanol, the residue is concentrated and inc...
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