Mixotroph-type functional microbial flora capable of removing acid-soluble cadmium and reducible-status cadmium in cadmium-polluted soil, and preparation method and application method thereof

Abstract

The invention discloses a mixotroph-type functional microbial flora capable of removing acid-soluble cadmium and reducible-status cadmium in cadmium-polluted soil, and a preparation method and an application method thereof, and belongs to the technical field of microbial treatment of heavy metal polluted soil. In the invention, the mixotroph-type functional microbial flora, which can high-effectively remove the acid-soluble cadmium and reducible-status cadmium soil, is prepared by compounding autotrophic and heterotrophic microorganisms, i.e., the flora not only includes heterotrophic microorganisms, such as Geobacter metallireducens, Alicyclo bacillus, Acetobacter diazotrophicus, Anaeromyxobacter and trichoderma, but also includes autotrophic microorganisms, such as Acidithiobacillus thiooxidans, Thiobacillus caldus and bacillusacidoohilus. The invention solves the problems that compound functional microbial flora is poor in adaptability and is difficult to colonize when being appliedto polluted soil. The functional microbial flora guarantees high removal rate of the acid-soluble cadmium and reducible-status cadmium in the polluted soil, significantly reduces bioavailability of cadmium and plant availability, and lays a certain fundament for promotion and application of microbial treatment of the cadmium-polluted soil.

Description

technical field [0001] The invention relates to a concurrent microbial functional flora for removing acid-soluble and reducible cadmium in cadmium-contaminated soil and a preparation and application method thereof, belonging to the technical field of microbial transformation and treatment of heavy metal-contaminated soil. Background technique [0002] At present, the area of ​​cultivated land polluted by heavy metals in my country is about 180 to 270 million mu, mainly distributed in Hunan, Jiangxi, Hubei, Sichuan, Guangxi, Guangdong and other provinces in southern my country, among which cadmium pollution is particularly serious. Cadmium-polluted areas are mainly concentrated in mining and metal smelting enterprises, sewage irrigation areas, suburbs of large and medium-sized cities, and acidic paddy soil areas in the south. According to investigations, cadmium-excessive foods have involved grain, aquatic products, cash crops, edible fungi, animal offal, etc., which shows th...

AI Technical Summary

Problems solved by technology

It not only solves the problem of poor adaptability and difficulty in colonization of the compound functional flora when added to polluted soil, but also ensures a high removal rate of acid-soluble and reducible cadmium in polluted soil, and significantly reduces the biological activity of cadmium. The effectiveness and plant availability have laid a certain foundation for the promotion and application of microbial treatment of cadmium-contaminated soil

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