Soil remediation agent prepared by using rice straw biomass charcoal as raw material and production method of soil remediation agent

Abstract

The invention discloses a soil remediation agent prepared by using rice straw biomass charcoal as a raw material and a production method of the soil remediation agent in the technical field of contaminated soil remediation. The soil remediation agent prepared by using the rice straw biochar as the raw material is composed of the following raw materials in percentages by mass: 45-55% of the rice straw biomass charcoal, 20-30% of polyhydroxy iron phosphate, and 20-30% of chitosan-supported amino iron oxyhydroxide, wherein the sum of the mass percentages of the raw materials is 100%. According tothe method, the soil remediation agent is obtained by uniformly mixing the rice straw biomass charcoal, the polyhydroxy iron phosphate and the chitosan-supported amino iron oxyhydroxide and performing mixing by using a stirring system, can reduce bioavailability of Cd and Pb, promote transformation of the Cd and the Pb into a more stable state, can adapt to the nature of soil and remediate a plurality of pollution, and has good remediation effects and low costs.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a soil remediation agent using rice straw biochar as a raw material and a production method thereof. Background technique [0002] Contaminated soil remediation generally reduces the concentration of pollutants in the soil to an acceptable level by transferring, adsorbing, transforming and degrading them, or transforms toxic and harmful substances into non-toxic and harmless substances. At present, the main restoration methods include physical restoration methods, chemical restoration methods and biological restoration methods. Among them, the chemical repair method is a relatively convenient and cheap technology, and has wide applicability. [0003] Chemical remediation technology mainly has two remediation directions: one is soil leaching, that is, the use of chemical eluents to transfer the solid-phase heavy metal Pb in the soil to the liquid phase, and ...

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Problems solved by technology

[0007] Moreover, due to the complex nature of the soil itself, many influencing factors, large buffering capacity, and the existence of various forms of heavy metal Pb in the soil, there are complex interactions such as competition and coexistence, resulting in various chemical fixatives. The restoration effect is low, therefore, the improvement of curing agent for complex soil environment needs to be solved urgently

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