Biochar-based passivator for acid soil remediation and preparation method thereof

Abstract

The invention provides a biochar-based passivator for acidic soil remediation and a preparation method and an application method thereof. The biochar-based passivator is prepared from the following raw materials in parts by weight: 30-40 parts of charcoal, 10-20 parts of polyacrylamide, 10-20 parts of weathered coal, 10-20 parts of quick lime, 10-20 parts of bentonite, 5-10 parts of a camellia oleifera shell-hydrothermal carbon material and 5-10 parts of a magnesium silicate-hydrothermal carbon material. The biochar-based passivator can reduce the proportion of available mercury in soil, rich surface functional groups of the biochar-based passivator can adsorb soil heavy metals, the performance is stable, and the proportion of available mercury in soil can be effectively reduced. According to the biochar-based passivator, solid wastes such as the medicine residues, the camellia oleifera shells and the weathered coal are utilized, waste resource utilization is achieved, environmental protection is achieved, the production cost is reduced, and in addition, the biochar-based passivator does not cause soil degradation and environmental pollution and is ecological, safe and environmentally friendly.

Description

technical field [0001] The invention relates to the field of agricultural technology, in particular to a biochar-based passivator for acidic soil restoration, a preparation method and an application method thereof. Background technique [0002] In recent years, with the rapid development of industry and agriculture, soil heavy metal pollution has brought a huge threat to the human living environment. As one of the most toxic heavy metal elements in soil, mercury has the characteristics of stable accumulation and difficult removal in soil. Mercury pollutes soil In addition to reducing the quality of the soil environment, it will also reduce the yield and quality of crops to varying degrees, and accumulate in the human body through the transmission and amplification of the food chain, thereby posing a threat to human health. The largest mercury industrial base in my country, once located in Wanshan District, Tongren City, Guizhou Province, has a mining history of hundreds of y...

AI Technical Summary

Problems solved by technology

[0003] Chemical passivation repair has the characteristics of strong applicability, fast repair, and economic feasibility, and has attracted widespread attention at home and abroad. However, the passivation materials used in passivators are mostly single or compound types such as lime and biochar. Passivating agents, such passivating agents are easily re-released into the soil environment in the acidic soil in the south, causing secondary pollution of the passivated heavy metal mercury in the soil

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