Cadmium-lead compound polluted farmland restoration agent and preparation method thereof

A compound pollution and repair agent technology, applied in the restoration of polluted soil, etc., can solve the problems of unknown ability of crops to absorb and transport heavy metals, high preparation cost, loss of repair agent, etc. The method is simple and the effect is stable

Active Publication Date: 2021-07-02
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these products still have the following problems: 1) It is only clear that the remediation agent can reduce the leaching and effectiveness of soil heavy metals, and it is unknown whether it can promote crop growth and reduce the ability of crops to absorb and transport heavy metals; 2) The remediation agent is easy to lose , waste repair efficiency, it is difficult to maintain long-term stability and high efficiency; 3) The raw material components are too complex, the preparation cost is high, and it is difficult to promote the use of large areas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] At room temperature, mix 10 parts of AM fungus and 30 parts of iron-manganese compound evenly, so that AM fungus is coated with iron-manganese oxide, and the iron-manganese oxide coated with AM fungus is passed through a 100-mesh sieve to form a mixed uniformity coefficient of variation. More than 10% of the powdery mixture, then adding a total of 60 parts of biochar into the powdery mixture in 3 batches and mechanically stirring, and then passing through a 100-mesh sieve to obtain a cadmium-lead composite polluted farmland restoration agent. For the particles that cannot pass through the sieve, they are artificially crushed until they can pass through a 100 mesh sieve.

[0029] Mix this restoration agent with air-dried and sieved 2mm contaminated soil according to 2% mass ratio until the color density is uniform and maintain 80% of the field water holding capacity. Conduct soil culture experiments at room temperature at 25°C. The net weight of air-dried and sieved soil ...

Embodiment 2

[0031] At room temperature, mix 5 parts of AM fungus and 20 parts of iron-manganese compound evenly, so that AM fungus is coated with iron-manganese oxide, and the iron-manganese oxide coated with AM fungus is passed through a 100-mesh sieve to form a mixed uniformity coefficient of variation. More than 10% of the powdery mixture, then add a total of 90 parts of biochar to the powdery mixture in 3 batches and mechanically stir until the color density is uniform, and then pass through a 100-mesh sieve to obtain the control of cadmium-lead compound polluted farmland. For powder restoration agent, manually crush the particles that cannot pass through the 100-mesh sieve.

[0032]Mix this restoration agent with air-dried and sieved 2mm contaminated soil according to 2% mass ratio until the color density is uniform and maintain 80% of the field water holding capacity. Conduct soil culture experiments at room temperature at 25°C. The net weight of air-dried and sieved soil in each pot...

Embodiment 3

[0034] At room temperature, mix 20 parts of AM fungi and 40 parts of iron-manganese compounds evenly, so that AM fungi are coated with iron-manganese oxides, and the iron-manganese oxides coated with AM fungi are passed through a 100-mesh sieve to form a mixed uniformity coefficient of variation. More than 10% of the powder mixture, then add 45 parts of biochar to the powder mixture in 3 batches and mechanically stir until the color density is uniform, and then pass through a 100-mesh sieve to obtain a powder for the treatment of cadmium-lead compound polluted farmland Restorative. For the particles that cannot pass through the sieve, they are artificially crushed until they can pass through a 100-mesh sieve.

[0035] Mix this restoration agent with air-dried and 2mm sieved contaminated soil according to the mass ratio until the color density is uniform and maintain 80% of the field water holding capacity. Conduct soil culture experiments at room temperature at 25°C. The net w...

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PUM

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Abstract

The invention discloses a cadmium-lead compound polluted farmland restoration agent and a preparation method thereof. The restoration agent comprises the following components and parts by weight: 5-20 parts of AM fungi, 20-40 parts of iron-manganese oxide; 45 ~90 parts of biochar. This restoration agent can not only restore cadmium and lead compound polluted soil, but also effectively reduce the content of cadmium and lead in agricultural products; the synergistic promotion between biochar, iron manganese oxide and AM fungus in this restoration agent fixes lead-cadmium Simultaneously, the increase of plant biomass is promoted; the restoration agent has stable effect, simple preparation method and low cost, and is suitable for popularization and use of cadmium and lead polluted soil in large areas.

Description

technical field [0001] The invention relates to the technical field of agricultural environment conservation and restoration, in particular to a cadmium-lead compound polluted farmland restoration agent and a preparation method thereof. Background technique [0002] Soil environmental pollution in some areas of my country is relatively serious. Soil pollution is usually dominated by a certain pollutant, and other pollutants exist at the same time, that is, the problem of compound pollution. According to reports, the area of ​​cultivated land polluted by heavy metals such as Cd, As, Cr, and Pb in my country is nearly 25 million hm 2 , accounting for about 1 / 5 of the total cultivated land area. Among them, cadmium-lead compound pollution, which is mainly cadmium pollution, seriously endangers the grain production and quality safety of major grain producing areas such as Hunan in my country. Therefore, soil cadmium-lead compound pollution has become an important environmental ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10B09C1/08B09C1/00
CPCB09C1/00B09C1/08B09C1/105
Inventor 汪明霞周小平谭文峰熊娟侯静涛杨正论
Owner HUAZHONG AGRI UNIV
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