A method for efficient remediation of mercury-contaminated soil
A remediation method and mercury pollution technology are applied in the field of remediation of mercury-contaminated soil and mercury-contaminated soil remediation through leaching, which can solve the problems of low secondary pollution, low mercury residue, and low leaching efficiency of mercury-contaminated soil, and achieve the effect. Good, strong elution ability, improved elution effect
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Embodiment 1
[0051] The contaminated farmland soil around a mercury mine in Guizhou was taken, and the mercury content in the soil was 7.8 mg / kg. After the soil was naturally air-dried, it was ground and passed through a 20-mesh sieve for use. Configure the oxidizing agent and each eluent respectively, wherein the oxidizing agent is to add 4% potassium persulfate solution to 5% HCl solution, the volume ratio is 1:10, the concentration of thiosulfate solution is 0.1moL / L, citric acid The concentration is 1moL / L, the concentration of potassium iodide is 0.1moL / L, the mass percentage concentration of sodium sulfide is 5%, and the addition amount of sodium hydroxide is 1.5% of the amount of sodium sulfide. Weigh 5g of the pretreated soil into a 100mL centrifuge tube, add deionized water to keep the soil moist, and then add the prepared oxidant potassium persulfate solution to control the potassium persulfate in the potassium persulfate solution and the mercury in the mercury-contaminated soil. ...
Embodiment 2
[0061] Get the same soil as in Example 1, and through the same air-drying, grinding and sieving process, configure the oxidizing agent and each eluent respectively, wherein the oxidizing agent is that 4% sodium persulfate solution is added in 5% HCl solution, The volume ratio is 1:10, and the eluent is a mixed solution of ammonium thiosulfate, citric acid, sodium iodide, sodium sulfide and sodium hydroxide, wherein the concentration of ammonium thiosulfate is 0.1moL / L, and the concentration of citric acid is 1moL / L L, the concentration of sodium iodide is 0.1moL / L, the mass percent concentration of sodium sulfide is 5%, and the addition of sodium hydroxide is 1.5% of the amount of sodium sulfide. Take the pretreated soil 5g in the 100mL centrifuge tube, and the next steps are all the same as in Example 1. After air-drying, the soil mercury content measured is 0.79mg / kg, which is higher than the value in Example 1, but lower than "Soil Environmental Quality Standard" (GB15618-1...
Embodiment 3
[0063]Get the same soil as in Example 1, and through the same air-drying, grinding and sieving process, configure the oxidizing agent and each eluent respectively, wherein the oxidizing agent is that 4% potassium persulfate solution is added in 5% HCl solution, The volume ratio is 1:10, and the eluent is a mixed solution of potassium thiosulfate, tartaric acid, potassium iodide, sodium sulfide and sodium hydroxide, wherein the concentration of potassium thiosulfate is 0.1moL / L, the concentration of tartaric acid is 1moL / L, and the concentration of potassium iodide It is 0.1moL / L, the mass percent concentration of sodium sulfide is 5%, and the addition amount of sodium hydroxide is 1.5% of the sodium sulfide consumption. Take the pretreated soil 5g in the 100mL centrifuge tube, and the next steps are all the same as in Example 1. After the air-drying process, the soil mercury content measured is 0.83mg / kg, which is higher than the value in Example 1, but lower than "Soil Enviro...
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