Abstract
In this paper, the content of heavy metals, leaching toxicity value and nutrient content of coal-fired solid waste (fly ash and desulfurization gypsum) from a coal-fired power plant in Northwest China were selected to qualitatively evaluate the impact on local soil, so as to guide the large-scale comprehensive utilization of coal-fired solid waste for soil improvement and landfill. The distribution of nutrients in fly ash and desulfurized gypsum has good complementarity. From the perspective of nutrient composition, the mixture of fly ash and gypsum (2:1) has a more favorable impact on soil. From the perspective of nutrient composition, controlled element content, the addition of gypsum and fly ash will not adversely affect the original nutrient composition and controlled element content of soil. From the perspective of leaching toxicity, the addition of gypsum and fly ash will increase the leaching toxicity content of As and Se in soil, but they still meet the water quality standard of class IV groundwater. When the leaching toxicity of As and Se in fly ash and gypsum does not exceed the standard, a large amount of coal-fired solid waste (fly ash and desulfurization gypsum) can be digested by mixing with soil.
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