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Remediation method for organic matter-heavy metal combined polluted soil

A technology of compound pollution and remediation method, which is applied in the field of remediation of organic matter-heavy metal compound polluted soil, and can solve problems such as long remediation period, secondary pollution of soil, poor remediation adaptability, etc.

Active Publication Date: 2021-05-18
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitation of each method, these processes have great limitations. For example, phytoremediation or biological remediation has a long remediation cycle, and at the same time, it has poor remediation adaptability to different types of polluted soil; the photocatalytic degradation efficiency is low, and some Some photocatalysts may cause secondary pollution to the soil

Method used

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  • Remediation method for organic matter-heavy metal combined polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown, the composite contaminated soil containing 9000mg / kg total petroleum hydrocarbons and 500mg / kg nickel was dried in an oven at 110°C, then ground and crushed to below 200 mesh, kaolin and soil were mixed evenly, and the mass ratio was 1:1 , and then calcined at a high temperature of 700 ° C for 3 hours to obtain a calcined soil mixture. The organic pollutant detection of this material shows that all harmful substances have been purified. The flue gas generated during the calcination process is collected and purified before being discharged.

[0023] Then mix and stir the calcined soil mixture and alkali activator (50wt% sodium silicate solution) according to the mass ratio of 1:0.7, put the slurry into a cylindrical mold with a diameter of 50mm and a height of 100mm, and discharge the slurry through vibration Bubbles in the body, sealed and cured at room temperature for 24 hours, then removed from the mold and placed in a curing box with a hum...

Embodiment 2

[0025] Such as figure 1 As shown, the composite contaminated soil containing 60mg / kg PAHs and 4047mg / kg cadmium was dried in an oven at 110°C, then ground and crushed to below 200 mesh, and the coal gangue powder was mixed with the soil evenly, with a mass ratio of 1 : 4, then calcined at a high temperature of 750°C for 4h to obtain a calcined soil mixture, and the material was tested for organic pollutants, and the results showed that the harmful substances had all been purified. The flue gas generated during the calcination process is collected and purified before being discharged.

[0026] Then mix and stir the calcined soil mixture and the alkali activator (50wt% sodium silicate solution) according to the mass ratio of 1:0.8, put the slurry into a cylindrical mold with a diameter of 50mm and a height of 100mm, and discharge it from the slurry after shaking Bubbles, sealed and cured at room temperature for 24 hours, then removed from the mold and placed in a curing box wit...

Embodiment 3

[0028] Such as figure 1 As shown, the composite polluted soil containing 90mg / kg pyrene, 3234mg / kg lead, 4205mg / kg copper and 45mg / kg cadmium was dried in an oven at 110°C, then ground and crushed to below 200 mesh, and a certain kaolin-rich The tailings and soil were mixed evenly, with a mass ratio of 1:1.2, and then calcined at 600°C for 6 hours to obtain a calcined soil mixture. The organic pollutants were tested for this material, and the results showed that all harmful substances had been purified. The flue gas generated during the calcination process is collected and purified before being discharged.

[0029] Then mix and stir the calcined soil mixture and alkali activator (20wt% potassium silicate solution) according to the mass ratio of 1:0.6, put the slurry into a cylindrical mold with a diameter of 50mm and a height of 100mm, and discharge it out of the slurry after shaking Bubbles, sealed and cured at room temperature for 24 hours, then demoulded and placed in a cu...

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Abstract

The invention discloses a remediation method for organic matter-heavy metal combined contaminated soil. The method comprises the steps that contaminated soil to be remedied is dried and then ground and smashed; the crushed polluted soil and an additive are fully and uniformly mixed according to a certain mass ratio and then subjected to high-temperature calcination, in the calcination process, organic pollutants in the polluted soil are thermally desorbed or partially cracked into volatile gas, and the volatile gas is discharged after being collected and purified; and the calcined soil mixture is fully and uniformly mixed with an alkali activator according to a certain mass ratio, and molding and curing are conducted to obtain a solidified body. According to the invention, organic matter in soil is thermally desorbed and separated from heavy metal pollutants by utilizing high temperature, a silicon-aluminum material is synchronously activated, then a calcined soil mixture is taken as a raw material and is mixed with the alkali activator to prepare a geopolymer solidified body, and the heavy metal pollutants can be effectively fixed in a geopolymer net-shaped structure, so that the prepared solidified body can be used as a building material, and meanwhile, double principles of recycling and harmlessness are embodied.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for remediating organic matter-heavy metal compound polluted soil. Background technique [0002] Soil is the basic material basis and carrier for human beings to survive. With the development of global industrialization in recent decades, the proportion of polluted soil is getting higher and higher. According to reports, my country's soil environment is not optimistic. The total soil exceeding the standard rate is 16.1%, and the soil pollution rate of cultivated land is nearly 20%. Therefore, the control of soil pollution is urgent. At present, soil pollutants can be divided into four categories according to their properties: organic pollutants, heavy metal pollutants, radioactive substance pollutants and pathogenic microbial pollutants, among which organic and heavy metal contaminated sites are the most common. Organic pollutants in soil mainly in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B09C1/08
CPCB09C1/065B09C1/08
Inventor 田全志张海军贺琼琼万克记陈长帅白颖楚
Owner CHINA UNIV OF MINING & TECH
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