A high-efficiency composite stabilizer for mercury-contaminated soil and a method for remediating mercury-contaminated soil
A compound stabilizer and mercury pollution technology, which is applied in the field of high-efficiency compound stabilizer and heavy metal polluted soil treatment agent, can solve the problem of low cost and achieve the effect of low cost, good stabilization effect and simple operation steps
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Embodiment 1
[0048] The mercury-contaminated site soil left over from the relocation of a chemical factory in Hunan was taken. The average mercury content in the soil was 120mg / kg. The mercury concentration is 0.13mg / L.
[0049] (1) Crushing and sieving the mercury-contaminated soil to a particle size ≤ 1 cm to remove larger stones and other debris;
[0050] (2) Add an appropriate amount of water to the mercury-contaminated soil to keep the soil moist so that various reactions can be carried out better, and then add a good oxidant (4% potassium persulfate solution is added to 5% HCl solution, the volume ratio 1:10), control the molar ratio of active ingredients in potassium persulfate to mercury element in the soil to be not less than 2:1, stir evenly, and heat for 20 minutes (the temperature is controlled at 80 degrees Celsius), so that the organic mercury and monovalent mercury in the soil into divalent mercury;
[0051] (3) Add 5% sodium sulfide solution, the addition of sodium sulfid...
Embodiment 2
[0057] Get the same soil as in Example 1, and through the same crushing and screening process, add an appropriate amount of water to the mercury-contaminated soil to keep the soil moist, then add the configured oxidant (4% sodium persulfate solution to 5% In the HCl solution, the volume ratio is 1:10), and the molar ratio of the active ingredient in the sodium persulfate to the mercury element in the soil is controlled to be not less than 2:1, stirred evenly, heated for 20min (the temperature is controlled at 80 degrees Celsius), and the remaining steps are Same as Example 1, after curing for 3 days, leaching was carried out according to the "Leaving Toxicity of Solid Waste Leach Method Horizontal Oscillating Method" (HJ557-2009), and the concentration of mercury in the leach solution was 0.0005mg / L, which was higher than the value in Example 1. However, it can meet the mercury leaching concentration requirements in the "Soil Remediation Standards for Heavy Metal Contaminated S...
Embodiment 3
[0059] Get the same soil as in Example 1, and through the same crushing and screening process, add the same oxidizing agent as in Example 1 to carry out the same oxidation reaction, add 5% potassium sulfide solution, and the addition of potassium sulfide is equal to the sulfur element and the soil. The molar ratio of the mercury element in the medium is 2:1, stir evenly, react for 30 minutes, add ferrous chloride, the addition amount is 1% of the soil mass, stir evenly, react for 15 minutes; add bentonite, zeolite and humus The mass ratio is 1:1:1, the total addition is 5% of the soil mass, and it is evenly stirred; the next step of adjusting the pH is the same as in Example 1, and after 3 days of curing, follow the "Solid Waste Leaching Toxicity Leaching Method Horizontal Oscillation Method" (HJ557-2009) is leached, and the concentration of mercury in its leachate is 0.0008mg / L, is higher than the value in embodiment 1, but can meet the heavy metal pollution in " heavy metal c...
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Abstract
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