Functional fertilizer and repair agents for repairing soil heavy metal

A technology for heavy metals and remediation agents, applied in soil conditioning materials, organic fertilizers, fertilizer mixtures, etc., can solve problems such as high cost and secondary pollution, and achieve the effects of low cost, environmental friendliness, and control of heavy metal migration.

Active Publication Date: 2014-05-14
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the chemical methods mainly include nano-iron powder reduction (CN201010230014.4) and chelation (CN201010229992.7), which are mainly aimed at the treatment of soil heavy metal eluents, which are costly and easily cause secondary pollution.

Method used

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  • Functional fertilizer and repair agents for repairing soil heavy metal
  • Functional fertilizer and repair agents for repairing soil heavy metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) By weight, mix 7 parts of attapulgite (colloidal grade) and 1 part of chitosan evenly, and add water to prepare a suspension with a concentration of 50g / L. Stir at 30°C for 20 minutes. Then use high-energy electron beam (5MeV, 10kGy) to irradiate for 10 minutes, so that chitosan is grafted on the surface of attapulgite rod crystals to form attapulgite-chitosan composites, and then dried at 30 degrees Celsius and crushed into 200 meshes;

[0021] (2) By weight, 1 part of the substance obtained in (1), 2 parts of biochar (rice husk ash, 200 mesh, 40% carbon content, 200 mesh) and 2 parts of sodium thiosulfate (200 mesh) Mix evenly to get the soil heavy metal remediation agent;

[0022] (3) Spread the restorative agent obtained in (2) evenly on the soil surface at an amount of 20kg per mu, and then plow the land.

Embodiment 2

[0024] (1) By weight, mix 11 parts of attapulgite (colloidal grade) and 3 parts of chitosan evenly, add water to form a suspension with a concentration of 100g / L, and stir for 40 minutes at 50°C. Then use high-energy electron beam (10MeV, 50kGy) to irradiate for 20 minutes to graft chitosan on the surface of attapulgite rod crystals to form attapulgite-chitosan composites, then dry at 60 degrees Celsius and pulverize into 400 meshes;

[0025] (2) By weight, 3 parts of the substance obtained in (1), 5 parts of biochar (rice husk ash, 400 mesh, 65% carbon content, 400 mesh) and 4 parts of sodium thiosulfate (400 mesh) Mix evenly to get the soil heavy metal remediation agent;

[0026] (3) Spread the restorative agent obtained in (2) evenly on the soil surface at an amount of 10kg per mu, and then plow the land.

Embodiment 3

[0028] (1) By weight, mix 7 parts of attapulgite (colloidal grade) and 1 part of chitosan evenly, and add water to prepare a suspension with a concentration of 50g / L. Stir at 30°C for 20 minutes. Then use high-energy electron beam (5MeV, 10kGy) to irradiate for 10 minutes, so that chitosan is grafted on the surface of attapulgite rod crystals to form attapulgite-chitosan composites, and then dried at 30 degrees Celsius and crushed into 200 meshes;

[0029] (2) By weight, 1 part of the substance obtained in (1), 2 parts of biochar (rice husk ash, 200 mesh, 40% carbon content, 200 mesh) and 2 parts of sodium thiosulfate (200 mesh) Mix evenly to get the soil heavy metal remediation agent;

[0030] (3) Add the restorative agent obtained in (2) to the organic fertilizer at a ratio of 5% by weight, and granulate to obtain the heavy metal repair organic fertilizer.

[0031] (4) Spread the restoration fertilizer obtained in (3) evenly on the soil surface at an amount of 60kg per mu, ...

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Abstract

The invention discloses functional fertilizer and repair agents for repairing soil heavy metal. Modified attapulgite, chitosan, biochar and sodium thiosulfate are compounded, and on one hand, the absorption performance of the attapulgite and the biochar and the chelation of the chitosan are used for fixing heavy metal ions in soil and preventing the heavy metal ions in the soil from migrating through leaching and runoff. On the other hand, the sodium thiosulfate is used for restoring the high-valence-state heavy metal ions (like hexavalent chromium ions) to low-valence-state ions (like trivalent chromic ions), and therefore virulence and solubleness of the ions are reduced.

Description

technical field [0001] The invention relates to a functional fertilizer and a repairing agent for repairing heavy metals in soil, belonging to the technical field of agricultural fertilizers. Background technique [0002] With the rapid development of the global economy, pollutants containing heavy metals enter the soil through irrigation, dry and wet deposition and other ways, resulting in the accumulation of heavy metals in the soil. Soil heavy metal pollution not only affects the yield and quality of agricultural products, but also affects the quality of the air and water environment, and can endanger the life and health of animals and humans through the food chain. At present, the world's average annual emission of Hg is about 15,000 tons, Cu is about 3.4 million tons, Pb is about 5 million tons, Mn is about 15 million tons, and Ni is about 1 million tons. According to the survey by the Ministry of Agriculture of my country, in the sewage irrigation area of ​​about 1.4 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C05G3/04C09K101/00C05G3/80
Inventor 吴正岩张静蔡冬清张欣吴丽芳贺璐璐
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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