Efficient conditioner used for restoring cadmium-arsenic composite polluted soil and application method of efficient conditioner

Abstract

The invention relates to a conditioner used for restoring polluted soil, in particular to an efficient conditioner used for restoring cadmium-arsenic composite polluted soil and an application method of the efficient conditioner. The efficient conditioner is composed of, by weight, 30-50 parts of hydroxyapatite, 10-30 parts of zeolite and 25-55 parts of modified carbonization straw. According to the hydroxyapatite, the whiteness is larger than or equal to 90, the particle size is larger than or equal to 300 meshes, the calcium content is 22-27%, and the phosphorous content is 9-12%; the zeolite is clinoptilolite, and contains 62-70% of SiO2, 13-17% of Ai2O3, 1-2% of Fe2O3, 3.5-6% of CaO and 1-3% of Na2O, and the particle size of the zeolite is larger than or equal to 100 meshes; and the rice straw is the straw of early rice or late rice. According to the different pollution extents of cadmium and arsenic in the soil, the soil efficient conditioner is reasonably used, and the content of the cadmium and arsenic in the coarse rise can reach the national food pollutant limit standard.

Description

technical field [0001] The invention relates to a conditioner for repairing polluted soil, in particular to a high-efficiency conditioner for repairing cadmium-arsenic composite polluted soil and an application method thereof. Background technique [0002] With the development of industry and agriculture and the mining of non-ferrous metals, compound pollution of cadmium and arsenic often occurs, which reduces the yield and quality of crops and endangers human health. In recent years, a large number of studies have found that clay minerals such as limestone, zeolite, diatomite, sepiolite, and bentonite have good effects in repairing positive heavy metal ions such as cadmium. The addition of these substances can reduce the exchangeable cadmium in the soil, and phosphate as a When a compound amendment treats heavy metal-contaminated soil, it cannot reduce the total amount of heavy metals, but reduces the bioavailability or toxicity of heavy metals by changing the form of heavy...

AI Technical Summary

Problems solved by technology

However, due to the differences in the properties and forms of cadmium and arsenic in the soil, these current methods and materials for treating cadmium-contaminated soil are often not suitable for the treatment of arsenic-contaminated soil, and the methods and materials for treating arsenic-contaminated soil are not suitable for the treatment of cadmium-contaminated soil. governance

[0003] Rice straw is one of the products of rice cultivation. Currently, it is used to produce animal feed and compost. However, most of the rice straw is burned on the spot, and the smoke from the burning has caused further harm to the local environment.

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