Preparation method of heavy metal polluted soil repairing agent

Abstract

The invention relates to the technical field of soil repairing and in particular to a preparation method of a heavy metal polluted soil repairing agent. The repairing agent is composed of a microorganism and expanded vermiculite; the preparation method comprises the following steps: after carrying out sterile treatment on the expanded vermiculite, mixing the expanded vermiculite and a bacterium suspension solution together according to a ratio; then carrying out adsorption culture on a mixture in a dark place; after few hours, carrying out adsorption balance and carrying out immobilization of the microorganism; providing suitable culture conditions for the microorganism by the bacterium suspension solution according to different conditions on nutrients, the potential of hydrogen, oxygen and the like of the microorganism; or adding an inhibitor to cause an environment which is only good for the growth of the microorganism and is used for inhibiting the growth of other microorganisms, so as to eliminate other microorganisms which are not needed; separating and purifying the microorganism by adopting a diluting and coating flat plate method or a flat plate marking method until a pure strain is obtained; inoculating the purified strain into a culture solution and culturing to obtain the heavy metal polluted soil repairing agent. The preparation method provided by the invention is simple and low in investment cost; the repairing agent can be used for effectively improving an immobilization effect of the microorganism on heavy metal and is suitable for repairing low-concentration heavy metal polluted farmland soil.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for preparing a remediation agent for low-concentration heavy metal pollution treatment of farmland soil. Background technique [0002] According to incomplete statistics, the area of ​​cultivated land polluted by heavy metals in China is about 2.0×107 hm 2 , accounting for about 20% of the total cultivated land area, mainly with moderate and light pollution. The sources of heavy metals in the soil are mainly the release of acid mines, the discharge of waste water and residues from mining and smelting industries, and other sources include sewage irrigation and sludge abuse, excessive application of pesticides and chemical fertilizers, and incomplete combustion of fossil fuels. The form of heavy metals in the soil affects their activity, bioavailability and migration characteristics. Some forms of heavy metals can be absorbed by plants, and eventually enter the ...

AI Technical Summary

Problems solved by technology

[0006] Due to the wide range of heavy metal pollution and the characteristics of its industrial use, industrial sites often use large-scale engineering technology methods for restoration, which requires a lot of investment and large-scale projects