Biochar-based bacterial composite soil conditioner as well as preparation and application thereof

Abstract

The invention discloses a biochar-based bacterial composite soil conditioner as well as preparation and application thereof. A preparation method comprises the following steps: (1) domestication of bacteria: sequentially inoculating bacillus cereus, ochrobactrum sp. and arthrobacter sp. into a Cd-containing inorganic salt culture solution with a gradient concentration respectively for domestication and cultivation; and mixing the domesticated and cultured bacterial solutions to prepare a bacterial suspension for later use; and (2) preparation of the biochar-based bacterial composite soil conditioner: taking biochar to be mixed with the bacterial suspension, adding antagonistic elements of heavy metals in soil, then performing shaking cultivation, filtering and washing. The biochar-based bacterial composite soil conditioner provided by the invention is simple in preparation method and low in cost; microorganisms in the preparation have high tolerance to the heavy metal Cd, so that the preparation has good remediation effect on the heavy metals in the soil, and is stable, long-acting, and less affected by the environment; the invention is an in-situ chemistry-combined microbial passivation remediation technology effectively applied to heavy metal-contaminated soil in farmlands.

Description

technical field [0001] The invention belongs to the field of remediation of farmland heavy metal polluted soil, in particular to a biochar-based flora composite soil conditioner and its preparation and application. Background technique [0002] With the development of industry and agriculture, a variety of harmful heavy metals will enter the soil through the discharge of industrial "three wastes" and the abuse of agricultural chemicals, seriously affecting the quality of the soil environment. The purpose of contaminated soil remediation is to reduce the content and bioavailability of pollutants in the soil, convert pollutants into less toxic or non-toxic substances, or block the transfer pathway of pollutants in the ecosystem, thereby reducing soil pollution harm to the environment, human body or other living organisms. Farmland heavy metal contaminated soil remediation technology can be divided into biological remediation technology, chemical remediation technology, physic...

AI Technical Summary

Problems solved by technology

[0004] However, a problem often encountered in bioaugmented remediation is the toxic effect of heavy metals on the added microbial activity.

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