Method for repairing cadmium-contaminated soil by using bacteria-montmorillonite compound

A technology of montmorillonite compound and cadmium-contaminated soil, applied in the restoration of contaminated soil, methods based on microorganisms, biochemical equipment and methods, etc., can solve the problem of affecting the original physiological and chemical properties of soil, secondary pollution, and limiting microbial remediation To achieve excellent soil cadmium pollution passivation performance, increase soil organic matter and nutrients, and achieve significant economic and ecological benefits

Inactive Publication Date: 2020-04-17
WUHAN UNIV OF TECH
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Problems solved by technology

However, the combined use of plants and microorganisms will also be limited by the growth cycle of plants, and the combined use of inorganic passivators and microorganisms will cause secondary pollution due to the input of passivators, or even affect the original physiological and chemical properties of the soil. Further use of restorative techniques

Method used

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  • Method for repairing cadmium-contaminated soil by using bacteria-montmorillonite compound
  • Method for repairing cadmium-contaminated soil by using bacteria-montmorillonite compound
  • Method for repairing cadmium-contaminated soil by using bacteria-montmorillonite compound

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Embodiment 1

[0021] A method for remediating cadmium-contaminated soil with a bacterium-montmorillonite compound, specifically comprising the following steps:

[0022] (1) Preparation of passivating agent: Weigh 50mg of montmorillonite and disperse it in 50mL of water, take 3.3mL of pre-cultured bacteria solution and add it to the montmorillonite suspension, adjust the pH to 5.5, and stir evenly at room temperature at 150rpm A bacteria-montmorillonite composite soil cadmium passivator was obtained, wherein the mass ratio of Bacillus subtilis to montmorillonite was 0.5:50.

[0023] (2) Preparation of contaminated soil: take some soil through a 2mm sieve, add 20mL of Cd(NO 3 ) 2 4H 2 O aqueous solution, fully mixed, so that the concentration of Cd treatment is 10mg / kg. Air-dry at room temperature, pass through a 2mm sieve after aging for 7 days, and obtain cadmium-contaminated soil samples.

[0024] (3) Effect monitoring.

[0025] Blank group: Accurately weigh 10g of the above-mentioned...

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Abstract

The invention relates to a method for repairing cadmium-contaminated soil by using a bacteria-montmorillonite compound, wherein the method comprises the steps: 1) taking a bacillus subtilis bacterialsolution cultured in advance, dropwise injecting the bacillus subtilis bacterial solution into a montmorillonite turbid liquid, uniformly mixing, and reacting to obtain a bacteria-montmorillonite compound mixed solution, wherein the mass ratio of bacillus subtilis to montmorillonite is (0.4-0.6):50; and 2) respectively adding water and the bacteria-montmorillonite compound mixed solution obtainedin the step 1) into the cadmium-contaminated soil, and carrying out repairing treatment for 7 days or more. According to the method, the bioavailability of cadmium in soil can be remarkably reduced, the excellent soil cadmium pollution passivation performance is achieved, the bacteria-montmorillonite compound is environmentally friendly, the physical and chemical properties of the soil are not affected, secondary pollution cannot be caused, organic matter and nutrients of the soil can be increased, and the economic and ecological benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of soil improvement, and in particular relates to a method for repairing cadmium-contaminated soil with a bacterium-montmorillonite compound. Background technique [0002] Soil is an important resource for human survival and sustainable social development. Clean and healthy soil is the basis for ensuring the quality of agricultural products and the safety of human living environment. However, with the development of industry and agriculture, in the production process, along with the arbitrary discharge of waste water and residue, sewage irrigation, and the extensive use of pesticides and fertilizers, heavy metals exceeding the environmental carrying capacity enter the soil environment, resulting in soil heavy metal pollution. A severe and difficult environmental problem. Among them, cadmium, as a highly toxic element, seriously endangers the ecological environment and human health. Cadmium in the soil is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08C12N1/20C12R1/125
CPCB09C1/08B09C1/10B09C2101/00C12N1/20
Inventor 夏令鄢圣金宋少先
Owner WUHAN UNIV OF TECH
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