Stabilizing agent for heavy metal contaminated soil and preparation method and application thereof
A technology for polluted soil and heavy metals, applied in the restoration of polluted soil, chemical instruments and methods, applications, etc., can solve the problems of unsustainable stabilization effect and high cost, and achieve long-term effective stabilization, low cost, and good pH control. effect of ability
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Embodiment 1
[0046] according to figure 1The process flow shown is to obtain a certain farmland soil, which is polluted by lead. The lead content in the surface soil is 381-1129mg / kg, and the lead concentration leached by the TCLP method is 5.98mg / L. After analysis, the pollutants in the soil are relatively simple and easy to stabilize. The ratio of the selected stabilizer agent is 60% of bone meal, 30% of shell meal, and 10% of biochar, and the amount of stabilizer agent added to the soil is 5%. The stabilizing agent is evenly distributed to the soil twice by hand, and after each distribution, the contaminated soil is loosened several times with a rotary tiller to achieve stabilization. Also compared with 5% phosphate stabilized and 5% lime stabilized samples.
[0047] Table 1 Concentration of Pb in TCLP leach solution before and after stabilization
[0048]
Embodiment 2
[0050] according to figure 1 The process shown in the figure shows that the polluted soil in a lead-zinc mining area is obtained. The pollutants in the surface soil are mainly lead, cadmium and zinc, and their concentrations are 637-3128mg / kg, 3.6-17.5mg / kg and 684-2873mg / kg respectively. . After analysis, the types of pollutants in the soil are relatively complex, and the pollution degree is relatively high. The ratio of the stabilizer agent used is 50% of bone meal, 40% of shell meal, and 10% of biochar. The amount of stabilizer agent added to the soil is 8 %. Adopt the method of ex-situ stabilization, dry the soil and mix it with the stabilizer in the mixer, adjust the moisture content to 10-20%, and maintain it at room temperature for 7-14 days to achieve the best stabilization effect. At the same time, it was compared with the sample stabilized with 5% phosphate. Table 1 Concentration of heavy metals in TCLP leachate before and after stabilization
[0051] ...
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