Application of guava leaves in reduction of heavy metal toxicity of farmland soil

Abstract

The invention discloses the application of guava leaves in reduction of heavy metal toxicity of farmland soil. The application comprises the following steps: drying guava leaves by air until constantweight is reached; crushing; screening the crushed guava leaves until 60 meshes are reached; adding the preprocessed guava leaves into soil to be treated, wherein the added guava leaves are 0.5-5% ofthe total amount of soil; uniformly mixing; and leaching the guava leaves for at least 16h in soil. The guava leaves are capable of effectively reducing the heavy metal toxicity of the farmland soil,particularly reducing the heavy metal toxicity of the farmland soil surrounding a lead-zinc mineral area; the guava leaves have passivating effects, and are wide in source, low in cost, green, environmentally friendly, and free from secondary pollution to the soil.

Description

technical field [0001] The embodiments of the present invention relate to soil heavy metal passivation technology, specifically, the application of guava leaves in reducing the toxicity of heavy metals in farmland soil, especially the toxicity of heavy metals in farmland soil around lead-zinc mining areas. Background technique [0002] In recent years, the problem of heavy metal pollution in soil has become increasingly serious. It is a difficult task for human beings to control and repair heavy metal pollution in passivated soil. It is necessary to find a passivator that is favorable and has a good curing effect to reduce the cost of treatment. According to the National Soil Pollution Survey Bulletin in 2014, the excessive situation of various heavy metal pollutants in the soil is serious, among which the heavy metals Cr, Zn, Cd, Ni, Cu, Pb, and As pollutants have an exceeding rate of 1.1 points respectively. %, 0.9%, 7.0%, 4.8%, 2.7%, 2.1%, 1.6%. From the source of heavy ...

AI Technical Summary

Problems solved by technology

Guangxi is rich in mineral resources. Since the 1980s, non-ferrous metal mining and beneficiation enterprises have emerged one after another. Due to extensive development models, irrational industrial structure, weak environmental protection awareness of enterprises, and insufficient supervision, heavy metal pollution in the soil of industrial and mining wasteland is very serious. Because of the backward technology at that time and the weak awareness of environmental protection, there was no treatment of waste water and slag discharged from mining and beneficiation plants.

Images