Repair method for multi-ring arene contaminated soil based on vinegar residues and waste ferrous sulfate in titanium dioxide plant

Abstract

The invention belongs to the technical field of environment, and provides a repair method for multi-ring arene contaminated soil based on vinegar residues and waste ferrous sulfate FeSO4 7H2O in a titanium dioxide plant. Vinegar residues and waste ferrous sulfate FeSO4 7H2O in the titanium dioxide plant are adopted as raw materials for preparing a soil repair material I and a material II. The material I is a mixture formed by smashing and mixing vinegar residues and waste ferrous sulfate FeSO4 7H2O. The material II is a product obtained by calcinating the soil repair material I under low temperature. When the total content of multi-ring arene is lower than 1,000 mg multi-ring arene / kg soil, the material I is selected; when the total content of multi-ring arene is high than 1,000 mg multi-ring arene / kg soil, the material II is selected. The selected soil repair material and the multi-ring arene contaminated soil are stirred and spread, the pH value of the soil does not need to be regulated, hydrogen peroxide is not needed, and under irradiation of visible light, the multi-ring arene in soil can be degraded and oxidized deep. The toxicity of contaminations in soil can be greatly lowered, and the growth coefficients of plants planted in the uncontaminated soil and repaired soil have no obvious difference.

Description

technical field

[0001] The invention belongs to the technical field of environment, and relates to resource utilization of wastes and a restoration method for soil polluted by polycyclic aromatic hydrocarbons. Background technique

[0002] my country is a big country in the production and consumption of vinegar. According to statistics, 0.8 tons of vinegar grains will be produced for every ton of vinegar produced. In 2015, the amount of vinegar grains produced was as high as 3.2 million tons. The water content of vinegar grains is as high as 65%-75%, which is acidic, and the pH of the filtrate is acidic (3-3.5). If a large amount of acid vinegar residues are not effectively treated every year, it will cause environmental pollution, soil acidification and other problems. At present, the resource utilization methods of vinegar grains mainly include feed, fertilizer, matrix and energy, and each method has obvious shortcomings and is difficult to promote. There is an urgent ne...

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