Remediation method for cadmium-polluted acid soil

Abstract

The invention discloses an absorber for repairing cadmium-polluted acid soil and a remediation method for restoring the cadmium-polluted acid soil by applying the absorber. The structure of the absorber comprises a water-permeable mesh bag, the top of the water-permeable mesh bag is connected with a hanging rope and a water collector, and the interior of the water-permeable mesh bag is sequentially filled with an adsorption layer and an oxalic acid fermentation layer from bottom to top; the absorber used in the invention fully utilizes natural substances, so that the cost is greatly reduced, and the method is pollution-free, simple, convenient and feasible; oxalic acid is produced by the oxalic acid fermentation layer, insoluble precipitates are formed by the oxalic acid and cadmium, and then the insoluble precipitates are adsorbed by the adsorption layer, so that the cadmium pollution treatment effect is excellent; the effect of equidistantly arranging the absorbers in a triangle during repairing is better, and the cadmium treatment efficiency can be improved; and the water collector is arranged, so that the soil treatment area of the absorber is greatly increased.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a method for remediating cadmium-contaminated acidic soil. Background technique [0002] Cadmium (Cd) has been widely used in pigments, plastics, electronics, metallurgy, electroplating and many other aspects since its discovery. Cadmium is a non-essential element for the human body. It often exists in the form of compounds in nature, and its content is generally very low. Under normal environmental conditions, it will not affect human health. When the environment is polluted by cadmium, cadmium can be enriched in organisms and enter the human body through the food chain to cause chronic poisoning. After cadmium is absorbed by the human body, it forms cadmium-sulfur protein in the body, which selectively accumulates in the liver and kidney. [0003] The most well-known incident of cadmium pollution is the major public nuisance incident “Itai-Itai” that occurred in Toyama Prefect...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, phosphate is generally used to repair cadmium-contaminated soil in situ, but the defect of this technology is that although the biological activity of cadmium is reduced by aging, it still remains in the soil

This method is easy to operate, but for the vast southern areas, such as Jiangxi, Hunan, Fujian, Guangdong and other areas dominated by acidic soil, the effect of in-situ restoration is poor and the effective time is very short

[0006] However, the ectopic repair technology in the prior art is mainly treated with a strong adsorbent. Although the effect is good, the cost is high and the engineering volume is large, which has become a fatal defect of the ectopic repair technology.

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