Heavy metal passivator for reducing bio-availability of cadmium in soil

A heavy metal passivation agent and bio-effective technology, applied in the direction of soil conditioning materials, organic fertilizers, fertilizer mixtures, etc., can solve the problems of high cost, large transportation volume, secondary pollution, etc., achieve convenient application, improve soil structure, The effect of reducing the effective content

Active Publication Date: 2016-02-03
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the soil dumping method and the alien soil method, because the soil per mu is as high as 150,000 kg, the transportation volume is huge, the cost is too high, and improper disposal will cause secondary pollution. From the perspective of economics and methods, it is impossible to become a mainstream restoration technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A heavy metal deactivator for reducing cadmium bioavailability in soil is prepared by mixing the following components by weight percentage: 70% of biochar and 30% of modified sodium alginate.

[0029] The biochar is used after being treated with a dilute alkali solution. The specific treatment of the dilute alkali solution is: put the biochar in a sodium hydroxide solution with a concentration of 0.3mol / L, heat it to 30°C, soak it for 8 hours, take it out and rinse it with distilled water ,drying.

[0030] Biochar is made by mixing bamboo charcoal, hickory shell charcoal and peanut shell charcoal according to the weight ratio of 3:2:1. The preparation method of the bamboo charcoal is obtained by cracking bamboo at 500° C. for 120 minutes in an oxygen-free environment; the preparation method of the hickory shell charcoal is: cracking the pecan shells at 500° C. for 120 minutes in an oxygen-free environment obtained; the preparation method of the peanut shell charcoal is...

Embodiment 2

[0037] A heavy metal deactivator for reducing cadmium bioavailability in soil is prepared by mixing the following components by weight percentage: 90% of biochar and 10% of modified sodium alginate.

[0038] The biochar is used after being treated with a dilute alkali solution. The specific treatment of the dilute alkali solution is: place the biochar in a sodium hydroxide solution with a concentration of 0.7mol / L, heat it to 40°C, soak it for 5 hours, take it out and rinse it with distilled water ,drying.

[0039]Biochar is made by mixing bamboo charcoal, hickory shell charcoal and peanut shell charcoal according to the weight ratio of 3:2:1. The preparation method of the bamboo charcoal is: cracking bamboo at 700°C for 90 minutes in an oxygen-free environment; the preparation method of the hickory shell charcoal is: cracking the hickory shell at 600°C for 90 minutes in an oxygen-free environment obtained; the preparation method of the peanut shell charcoal is obtained by py...

Embodiment 3

[0046] A heavy metal deactivator for reducing cadmium bioavailability in soil is prepared by mixing the following components by weight percentage: 80% of biochar and 20% of modified sodium alginate.

[0047] The biochar is used after being treated with a dilute alkali solution. The specific treatment of the dilute alkali solution is: put the biochar in a sodium hydroxide solution with a concentration of 0.5mol / L, heat it to 35°C, soak it for 6 hours, take it out and rinse it with distilled water ,drying.

[0048] Biochar is made by mixing bamboo charcoal, hickory shell charcoal and peanut shell charcoal according to the weight ratio of 3:2:1. The preparation method of the bamboo charcoal is: cracking bamboo at 600°C for 100 minutes in an oxygen-free environment; the preparation method of the hickory shell charcoal is: cracking the hickory shell at 550°C for 100 minutes in an oxygen-free environment obtained; the preparation method of the peanut shell charcoal is obtained by c...

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PUM

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Abstract

The invention discloses a heavy metal passivator for reducing the bio-availability of cadmium in soil. The heavy metal passivator is prepared by mixing the following components in percentage by weight: 70 to 90 percent of biochar and 10 to 30 percent of modified sodium alginate. The heavy metal passivator disclosed by the invention not only has a function of passivating the heavy metal in the soil in situ, but also is capable of improving the soil structure and increasing the soil porosity, the pH (Potential of Hydrogen) of the soil is increased to a larger extent, and the function of repairing acidified soil is also obtained.

Description

technical field [0001] The invention relates to a heavy metal passivator, in particular to a heavy metal passivator for reducing the bioavailability of cadmium in soil. Background technique [0002] Due to the accelerated development of industrialization and urbanization, there are different degrees of cadmium (Cd) pollution risks in some farmland soils in my country. According to reports, the average input rate of Cd in the plow layer soil in my country is 0.004 mg / kg per year, which is one of the high-risk heavy metal elements. The accumulation of harmful heavy metals in the soil to a certain extent will not only lead to soil degradation, crop yield and quality decline, but also may directly poison plants or endanger human health through the food chain. [0003] At present, there have been many reports on the research on soil heavy metal pollution remediation technology. Researchers from various countries have successively explored deep tillage method, soil dumping method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C08B37/04C09K101/00C09K109/00
Inventor 刘玉学汪玉瑛吕豪豪杨生茂钟哲科
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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