Soil conditioner for reducing bioavailability of cadmium in acid heavy cadmium polluted soil and method for improving soil

Abstract

The invention discloses a soil conditioner for reducing bioavailability of cadmium in acid heavy cadmium polluted soil, which comprises red mud and zinc fertilizer at a mass ratio of (50-100):1. The invention also discloses a method for improving mild or moderate polluted soil, which comprises the following steps: selecting cadmium-containing acid slight-moderate polluted soil as improvement object, before ploughing and fertilizing, uniformly spreading soil conditioner on the surface of the moderately or heavily polluted soil while controlling the use amount of the soil conditioner at a levelat which 1,500-9,000 Kg red mud and 15-90 Kg zinc fertilizer are contained per hectare soil, ploughing to enable red mud and zinc fertilizer to be sufficiently mixed with the polluted soil, and balancing for 7-10 days. The soil conditioner and the soil improvement method provided by the invention have the advantages of low cost, quick action, high safety, is environment-friendly, and on the like,and can effectively reduce the bioavailability of cadmium in acid heavy metal polluted soil.

Description

technical field [0001] The invention belongs to the field of treatment and restoration of heavy metal polluted soil, and in particular relates to a soil conditioner and a using method thereof. Background technique [0002] The harm of heavy metals to human health has attracted more and more attention. Among them, cadmium (Cd) ranks first among the 12 dangerous chemicals with global significance proposed by the United Nations Environment Programme. Cadmium is a non-essential element for the human body, and its half-life in the human body is as long as 20 to 40 years, which can cause "bone pain disease" and kidney damage (Chen Yingxu, "Environmental Science", 2005). The food chain has become the primary way for heavy metals to endanger human health. The World Health Organization (WHO) recommends that the daily intake of cadmium should not exceed 68 μg, and food cadmium pollution leads to a great risk of human daily intake exceeding this limit. About 60% of the population in m...

AI Technical Summary

Problems solved by technology

Engineering treatment measures are often limited due to the large amount of engineering, high cost, and possible damage to soil ecological functions; although bioremediation has the advantages of simple implementation and no pollution, it is difficult to achieve the restoration effect in the short term

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