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

Active Publication Date: 2014-04-23
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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Problems solved by technology

[0008] The invention provides a heavy metal-contaminated soil stabilizing agent and its preparation method and application, which solv

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  • Stabilizing agent for heavy metal contaminated soil and preparation method and application thereof

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Example Embodiment

[0045] Example 1

[0046] according to figure 1 The process flow shown is to obtain a certain farmland soil, which is contaminated by lead, the lead content in the surface soil is 381-1129 mg / kg, and the lead concentration leached by the TCLP method is 5.98 mg / L. After analysis, the pollutants in the soil are relatively simple and easy to stabilize. The ratio of stabilizing agents is 60% bone meal, 30% shell powder, and 10% biochar. The amount of stabilizing agent added to the soil is 5%. The stabilizing agent is evenly distributed to the soil in two separate steps. After each distribution, the contaminated soil is loosened by a rotary tiller to achieve stabilization. It is also compared with the 5% phosphate stabilized and 5% lime stabilized samples.

[0047] Table 1 Pb concentration of TCLP leachate before and after stabilization

[0048]

Example Embodiment

[0049] Example 2

[0050] according to figure 1 The process flow shown is to obtain contaminated soil from a lead-zinc mining area. The main pollutants in the surface soil are 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 more complicated and the pollution degree is high. The ratio of stabilizing agent is 50% bone meal, 40% shell powder, and 10% biochar. The amount of stabilizing agent added to the soil is 8 %. Using ex-situ stabilization method, the soil is dried and mixed with stabilizing agent in a mixer, the moisture content is adjusted to 10-20%, and the curing is 7-14 days at room temperature to achieve the best stabilization effect. It is also compared with the 5% phosphate stabilized sample. Table 1 Heavy metal concentration in TCLP leachate before and after stabilization

[0051]

[0052] According to the market price of the raw materials,...

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Abstract

The invention discloses a stabilizing agent for heavy metal contaminated soil and a preparation method and application thereof, and the stabilizing agent comprises the following raw materials: by weight, 20-60% of bone meal; 10-30% of biochar and 20-70% of calcined shell powder. The preparation method is as follows: (1) drying biomass in air and grinding into particles smaller than 60 meshes, cracking in a cracking furnace at 400-800 DEG C for 6-8 hours to obtain the biocar; calcining shell powder with the particle size below 20 meshes in a high temperature furnace at 800-1000 DEG C for 2 to 4 hours, naturally cooling to room temperature to obtain the calcined shell powder; and (2) proportionally mixing the biocar, the calcined shell powder and the bone meal evenly to obtain the stabilizing agent. The stabilizing agent compounding the three components in accordance with a specific proportion solves the problem of high cost, undurable stabilization effect and the like of stabilizing agents for the heavy metal contaminated soil in the prior art.

Description

technical field [0001] The invention relates to a method for harmless treatment of heavy metal polluted soil, in particular to a heavy metal polluted soil stabilizing agent and its preparation method and application. Background technique [0002] Due to its long-term latency, concealment, and irreversibility, soil heavy metal pollution has become one of the major environmental problems to be solved in my country. The discharge of "three wastes" from mining, smelting, electroplating, chemical, electronics, leather and other industries, as well as the unreasonable application of pesticides and fertilizers will lead to heavy metal pollution in the soil. Heavy metals in the soil will not only affect the yield and quality of crops, but also accumulate and amplify along with water and air circulation and food chains, endangering human health. [0003] Heavy metal stabilization technology is a disposal technology applied to heavy metal hazardous waste. Through the addition of stab...

Claims

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Application Information

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IPC IPC(8): C09K17/06B09C1/08C09K101/00
Inventor 张弛顾震宇裘知韦彦斐钟重王睿
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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