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
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[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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