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Application of biochar-based combination to improvement of heavy metal contaminated soil

A biochar and composition technology, applied in the field of soil treatment, can solve the problems of unstable repair effect and short duration, and achieve the effect of improving heavy metal polluted farmland, low cost, and reducing emissions

Inactive Publication Date: 2016-11-16
INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides an application of a biochar-based composition in the improvement of heavy metal-contaminated soil, which is used to solve the technical defects in the prior art that the repairing effect of heavy metal pollution is unstable and the duration is not long

Method used

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  • Application of biochar-based combination to improvement of heavy metal contaminated soil
  • Application of biochar-based combination to improvement of heavy metal contaminated soil
  • Application of biochar-based combination to improvement of heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 1000g of sawdust, dry and pulverize it until the particle size is less than 25mm, put it into an atmosphere box furnace, pump it into a vacuum and feed nitrogen as a protective gas, raise the temperature to 220°C at a rate of 6°C / min, stay for 30min, and then After heating up to 550°C / min, keep it warm for 3 hours, pass through a 20-mesh sieve after grinding, soak in 1mol / L hydrochloric acid for 3 hours, wash and dry to obtain wood chip biochar, which is the first intermediate product 1.

[0028] Weigh 100 g of alkali-making waste residue, dry and pulverize it, and pass through a 60-mesh sieve to obtain the second intermediate product 1.

[0029] Mix 250g of the first intermediate product 1 with 50g of the second intermediate product 1, pass through a 100-mesh sieve after drying, and obtain the product 1.

Embodiment 2

[0031] Weigh 1000g of rice husk, dry and pulverize until the particle size is less than 10mm, put it into a vacuum tube furnace, and after vacuuming, feed nitrogen as a protective gas, raise the temperature to 250°C at 8°C / min, stay for 25min, and then heat it up at 3°C / min. Min heat up to 550°C, keep it warm for 2 hours, grind through a 100-mesh sieve, soak in 3mol / L hydrochloric acid for 1 hour, wash and dry to obtain chaff biochar, which is the first intermediate product 2.

[0032] Weigh 100g of lime, dry and pulverize it, and pass through a 60-mesh sieve to obtain the second intermediate product 2.

[0033] Mix 300g of the first intermediate product 2 with 30g of the second intermediate product 2, pass through an 80-mesh sieve after drying, and obtain the product 2.

Embodiment 3

[0035] Weigh 1000g of corn stalks, dry and pulverize them until the particle size is less than 10mm, put them into an atmosphere box furnace, vacuumize and feed nitrogen as a protective gas, raise the temperature to 260°C at 10°C / min, stay for 45min, and then heat up to 260°C at 2°C / min After heating up to 750°C, keep it warm for 1 hour, grind it through a 100-mesh sieve, soak it in 2mol / L hydrochloric acid for 2 hours, wash and dry it to prepare corn straw biochar, which is the first intermediate product 3.

[0036] Weigh 100 g of alkali-making waste residue, dry and pulverize it through a 60-mesh sieve to obtain the second intermediate product 3.

[0037] Mix 200g of the first intermediate product 3 with 60g of the second intermediate product 3, pass through an 80-mesh sieve after drying, and obtain the product 3.

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Abstract

The invention belongs to the field of soil remediation, and particularly relates to an application of a biochar-based combination to improvement of heavy metal contaminated soil. The biochar-based combination is made from biochar and an alkaline modifier. The biochar is prepared from forestry and agricultural residues. The invention further provides the application of the biochar-based combination in soil improvement, and particularly provides the application of the biochar-based combination to reduction of the heavy metal content in soil. The experimental determination shows that by means of the technical scheme, the content of heavy metal in soil can be effectively reduced, the pH value of soil is improved, and furthermore the yield of crops planted in the soil is improved. The technical defects that in the prior art, in the remediation process of heavy metal contaminated soil, the remediation effect is unstable and the time of duration is short are primarily overcome. Meanwhile, the biochar-based combination has the advantages of being low in cost, convenient and easy to obtain and free of secondary pollution.

Description

technical field [0001] The invention belongs to the field of soil treatment, and in particular relates to the application of a biochar-based composition in the improvement of heavy metal polluted soil. Background technique [0002] With the acceleration of urbanization and industrialization in our country, the discharge of industrial "three wastes" such as electroplating, steel and printing and dyeing is increasing, and the unreasonable application of pesticides and fertilizers containing heavy metals in agricultural production has caused heavy metals to pass through various channels. into the soil. According to the "National Soil Condition Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2015, the heavy metals in farmland soil exceeded the standard by 19.4%, and the polluted area increased year by year, seriously threatening human health and food security. Therefore, how to effectively remediate heavy met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08C05D3/00C05D3/02C09K17/06C09K2101/00C09K2109/00
Inventor 黄玉芬李衍亮魏岚黄庆黄连喜刘忠珍许桂芝杨少海
Owner INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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