Method for repairing Cd or Pb contaminated soil by combining coal gasification slag with ryegrass

A technology for coal gasification slag and polluted soil, applied in the field of soil pollution control, can solve the problems of low biomass absorption by plants, short plant growth, and long time for phytoremediation of soil pollution, so as to increase biomass, improve adsorption capacity, and improve root the effect of the environment

Pending Publication Date: 2020-08-11
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the phytoremediation method has the advantages of relatively low repair cost and no secondary pollution to the environment, there are still certain limitations, such as heavy metals

Method used

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  • Method for repairing Cd or Pb contaminated soil by combining coal gasification slag with ryegrass
  • Method for repairing Cd or Pb contaminated soil by combining coal gasification slag with ryegrass
  • Method for repairing Cd or Pb contaminated soil by combining coal gasification slag with ryegrass

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Experimental program
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Effect test

Embodiment 1

[0040] This embodiment includes the following steps:

[0041] Step 1. Air-dry the soil and pass it through a 100-mesh sieve to remove large impurities such as gravel, animal and plant residues, and measure the soil's pH, organic matter, total nitrogen, total phosphorus, total potassium, and cation exchange capacity to determine soil performance parameters ;

[0042] Step 2. According to the mass ratio of 1:4, the coal gasification slag with a particle size of 150 mesh to 200 mesh is added to the sieved soil in step 1 and mixed evenly to obtain a mixed soil;

[0043] Step three, 200mL concentration is the Cd(Cl) of 1.25g / L 2 Add the solution to 10kg of the mixed soil obtained in step 2 and stir evenly, then seal it with a plastic film, and store it in a dark place for 3 months to obtain Cd-contaminated soil; the Cd concentration in the Cd-contaminated soil is 25mg / kg;

[0044] Step 4. Put the Cd-contaminated soil obtained in Step 3 into a plastic flowerpot with a height of 30...

Embodiment 2

[0047] The difference between this embodiment and embodiment 1 is: in step 3, Cd(Cl) 2 The mass concentration of the solution is 2.50g / L, and the Cd concentration in the Cd-contaminated soil is 50mg / kg.

[0048] In addition, the ryegrass obtained under the same process conditions as in Example 2 but without adding coalification gas slag was used as the control group (CK) of Example 2, and the ryegrass obtained in Example 2 was used as the sample group (CGS).

Embodiment 3

[0050] The difference between this embodiment and embodiment 1 is: in step 3, Cd(Cl) 2 The mass concentration of the solution is 5.0g / L, and the Cd concentration in the Cd-polluted soil is 100mg / kg.

[0051] In addition, the ryegrass obtained under the same process conditions as in Example 3 but without adding coalification gas slag was used as the control group (CK) of Example 3, and the ryegrass obtained in Example 3 was used as the sample group (CGS).

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Abstract

The invention discloses a method for repairing Cd or Pb contaminated soil by combining coal gasification slag with ryegrass. The method comprises the following steps: 1, air-drying soil, and sieving to remove impurities; 2, adding the coal gasification slag into the sieved soil, and uniformly mixing to obtain mixed soil; 3, carrying out chemical treatment on the mixed soil to obtain Cd or Pb contaminated soil; and 4, sowing ryegrass seeds in the Cd or Pb contaminated soil. The coal gasification slag and the ryegrass are combined to repair the Cd or Pb contaminated soil; a porous structure of silicate minerals and carbon particles in the coal gasification slag is utilized; the tolerance of ryegrass to Cd or Pb is improved, so that the remediation capacity and efficiency of ryegrass to Cd orPb contaminated soil are synergistically improved, the harm of leaching of Cd or Pb to underground water and the pollution of Cd or Pb to the environment are reduced, meanwhile, secondary pollution to the environment is avoided, and resource utilization of wastes is realized.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control, and in particular relates to a method for repairing Cd or Pb polluted soil by combining coal gasification slag and ryegrass. Background technique [0002] Soil plays an extremely important role in the environment and agricultural production. With the rapid development of economy, industry and agriculture, as well as the application of excessive pesticides in the field, and the discharge of industrial waste and wastewater, the soil is becoming more and more polluted by heavy metals, and heavy metals can endanger human health through the food chain. Therefore, it is urgent to restore heavy metal pollution in soil . [0003] At present, the main soil heavy metal pollution remediation methods include physical, chemical and biological remediation methods. Due to the limitations of physical and chemical remediation methods (such as secondary pollution to the environment), phytoremediati...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08B09C1/10
CPCB09C1/00B09C1/08B09C1/105B09C2101/00
Inventor 罗平平苏沉路琪儿霍文博李春荣周美梅吕继强邓红章赵建林
Owner CHANGAN UNIV
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