Application of oxalic acid in removal of soil cadmium pollution

Abstract

The invention relates to an application of oxalic acid in removal of soil cadmium pollution. High-level pure oxalic acid is selected to prepare an oxalate solution with the concentration of 0.05wt%-1wt%, and the oxalate solution is used as an eluting agent; the eluting agent is added into polluted soil; an eluting process can be finished by oscillating, centrifuging and collecting an eluted solution at room temperature and then filtering the eluted solution; and a liquid to solid ratio of the chemical eluting agent to the polluted soil is 10:1 (ml / g). The chemical eluting agent formula is simple; the effect is outstanding; the operability is high; the application cost is low; the eluting rate is high; and a relatively good effect of removing cadmium ions in the soil is achieved. A test shows that when the concentration is 0.2 percent, the eluting rates are respectively 65.91 percent and 48.065 percent; and secondary pollution to the soil is avoided.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal pollution in the environment, in particular to the application of oxalic acid in removing cadmium pollution from soil. Background technique [0002] With the expansion of industrial production scale and the rapid growth of population, heavy metal pollution in soil is becoming more and more serious. And heavy metals in polluted soil can migrate to water bodies and plants, which seriously affects environmental quality and sustainable economic development, and threatens human health. [0003] Soil heavy metal cadmium has the characteristics of concealment, long-term and irreversible. At the same time, as the type of soil heavy metals that my country pays the most attention to and has the widest range of influence, its pollutants will cause obvious harm to the growth and development of crops, and can also endanger human health through the food chain. [0004] At present, phytoreme...

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Problems solved by technology

However, studies have shown that strong acid leaching agents will destroy the soil structure during the leaching process, poisoning the biological communities in the soil and making the soil unable to be reused; EDTA, EDDS and active agents have poor biodegradability, high production costs, and easy to cause secondary pollution. Pollution (Lv Qingsong, Jiang Yufeng et al., 2010)

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