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A kind of removal method of soil heavy metal Cr and/or Hg

A heavy metal and soil technology, applied in the field of soil heavy metal pollution control, to achieve the effect of easy mastery and promotion, high added value, and realization of transformation

Active Publication Date: 2020-04-10
YULIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty of this technique is mainly to screen specific plants for different heavy metal treatments

Method used

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  • A kind of removal method of soil heavy metal Cr and/or Hg
  • A kind of removal method of soil heavy metal Cr and/or Hg
  • A kind of removal method of soil heavy metal Cr and/or Hg

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 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;

[0038] 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.

[0039] 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

[0044] 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;

[0045] 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.

[0046] 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

[0051] 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;

[0052] 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.

[0053] 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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Abstract

The invention relates to a removing method for heavy metal Cr and / or Hg in soil. Salix psammophila wood chips are taken and soaked in an acetate solution for 2-4 h firstly, the salix psammophila wood chips are taken out, the pH value of the salix psammophila wood chips is regulated to be neutral, and the salix psammophila wood chips are dried and sifted. Salix psammophila is planted on the soil polluted by the heavy metal Cr and / or Hg. The sifted salix psammophila wood chips are sprinkled in soil of an area at a horizontal distance of 20-40 cm with salix psammophila plant root systems. All plants of the salix psammophila are taken after the salix psammophila naturally grows to be mature, the salix psammophila is planted continuously till the contents of Cr and Hg in the soil reach the standard, and removing of the heavy metal Cr and / or Hg in the soil is completed. The salix psammophila is a tolerant species of the heavy metal Cr and / or Hg. In order to prevent the situation that the heavy metals are detained in the dead angles among the plants in the soil, the salix psammophila is adopted to be a main material and modified, and an adsorbing agent is obtained. By means of the adsorption of the adsorbing agent to the heavy metal Cr and / or Hg, transferring and transforming of the heavy metals are strengthened, and removing of the heavy metal Cr and / or Hg in the soil is achieved.

Description

【Technical field】 [0001] The invention relates to the field of treatment of soil heavy metal pollution, in particular to a method for removing heavy metal Cr and / or Hg from soil. 【Background technique】 [0002] Soil is a country's precious natural resources and the material basis for the development of agriculture. However, due to the irrigation of sewage sludge, the application of pesticides and fertilizers, the accumulation of heavy metal pollutants, and the deposition of heavy metals in the atmosphere, the problem of heavy metal pollution in sludge has become increasingly serious. Soil heavy metal pollution has caused huge losses to the economy and the environment, and has also brought potential threats to human health. Therefore, how to effectively repair and control soil heavy metal pollution has become one of the hot issues of concern all over the world. [0003] The traditional remediation methods of heavy metal pollution in soil mainly include landfill method, leach...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
CPCB09C1/00B09C1/105B09C2101/00
Inventor 相玉琳相玉秀王立鹏王若恺
Owner YULIN UNIV
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