Arsenic contaminated soil remediation method
A technology for soil remediation and arsenic pollution, applied in the field of soil pollution remediation, can solve the problems of high treatment cost, low remediation efficiency, inability to effectively remove soil heavy metal pollution sources, etc., and achieves the effect of simple preparation method and good treatment effect.
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[0019] Take 1Kg of soil from the arsenic-contaminated plot, and detect that the arsenic content in the soil sample is 92.31mg / kg, and process it into 2-5mm soil particles through a crusher; configure sodium citrate solution, and mix the prepared Add 1mol / L sodium citrate solution to the soil particles and mix and stir for 30 minutes to obtain a mixture of soil and solution; add 3mol / L hydrogen iodide solution to the mixture of soil and solution, stir well, and keep the soil pH=5.5. Arsenate ions or arsenic acid and iodide ions generate elemental iodine and arsenous acid or arsenite under acidic conditions; filter the soil, send it to a vacuum heat treatment device, heat it to 460°C, and keep the system pressure at 1Kpa for 30 minutes. The arsenous acid or arsenite in the soil is transformed into arsenic oxide, and the iodine element and arsenic oxide in the soil are volatilized from the soil, separated from the soil, cooled to room temperature, and the repaired soil is obtained...
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