A root micro-geochemical barrier technique for remediating heavy metal pollution in paddy fields

Abstract

The invention discloses a process for repairing heavy metal-contaminated rice fields by using root system micro-geochemical barrier technology. The process includes the following steps: (1) mixing rice field seedling soil and heavy metal repair materials, and the rest of the seedling raising process follows the local farming system (2) In the process of applying base fertilizer and post-dressing fertilizer, the heavy metal repair material is added to the farmland, and other farming processes are cultivated according to local habits; this process is based on the absorption characteristics of the roots of the rice growth process to the soil substances, select Appropriate mineral materials form a chemical barrier in the surrounding area to protect the root system and reduce or block the root system's absorption of pollutants; this method is used to repair and treat cadmium and lead-contaminated paddy fields, and cadmium in farmland is effective. The state can be reduced by 40%, and the rice reaches the standard after restoration.

Description

technical field [0001] The invention relates to the field of remediation of heavy metal pollution, in particular to a process for repairing heavy metal pollution by throwing seedlings and planting paddy fields with root system micro-geochemical barrier technology. Background technique [0002] During the migration of elements, if the physical and chemical conditions of the environment change drastically, resulting in the decline of the migration ability of the elements that originally migrated stably in the medium, and the elements precipitate due to the formation of a large number of compounds, these conditions or factors that cause element precipitation are called for geochemical barriers. According to the principle of geochemical barrier, using the adsorption and absorption characteristics of mineral materials, heavy metal pollution in water and soil in environmental media can be treated, which is the application of geochemical barrier technology. [0003] Heavy metals s...

AI Technical Summary

Problems solved by technology

CN1058851002A discloses that a lead and cadmium barrier agent is sprayed on the leaves of rice at the tillering stage, heading stage, and filling stage respectively. The order of the enrichment and distribution of heavy metals in rice is root, stem, seed, and leaf. Ineffective in reducing lead and cadmium content in rice

[0005] In the past, heavy metal restoration projects in farmland were mostly broadcast directly in the field, which has four disadvantages: (1) The amount of materials used is large, and a lot of materials are broadcast into the soil layer far away from the rice root system. Although it can also repair the farmland, it is inevitable. Some waste; (2) increasing the labor of farmers, sowing in large fields is more labor-intensive, and the common people may not accept it; (3) The materials scattered in the field may be turned to the deep soil far away from the plowing layer with repeated plowing of the field (4) The amount of materials used is large, and the cost of repair is high. The common people cannot afford the cost, and the technology cannot be promoted smoothly.

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