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Method for solidifying-stabilizing bottom mud polluted by heavy metals by using cement and organic sulfides and application of obtained solidified body

A technology for polluting sediment and heavy metals, applied in water pollutants, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of reducing the secondary risk of products, reduce the leaching concentration of heavy metals, and reduce the increase in capacity. Compared with the effect of preventing secondary pollution

Active Publication Date: 2013-02-20
HUNAN UNIV
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Problems solved by technology

The common heavy metal stabilizers can be divided into two types: inorganic type and organic type. Among them, the organic type is mainly chelating agent, and the hydrophobic and insoluble chelate formed by the reaction with heavy metals in sediment can be used in a wide range. It can be kept stable in the pH value range, thereby reducing the secondary risk of the product, and has more advantages in the actual application process. However, the application of its joint solidification and stabilization with cement to treat heavy metal-contaminated sediments is rarely reported.

Method used

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  • Method for solidifying-stabilizing bottom mud polluted by heavy metals by using cement and organic sulfides and application of obtained solidified body
  • Method for solidifying-stabilizing bottom mud polluted by heavy metals by using cement and organic sulfides and application of obtained solidified body
  • Method for solidifying-stabilizing bottom mud polluted by heavy metals by using cement and organic sulfides and application of obtained solidified body

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Embodiment

[0020] The basic physical and chemical properties of the heavy metal-contaminated sediment for the test are: pH is 7.79, water content is 53.90%, heavy metals include Cd, Zn, Pb, Cr and Cu, among them, the content of Cd is 121.00mg / kg, and the content of Zn is 7850.30mg / kg, the Pb content is 1032.00mg / kg, the Cr content is 595mg / kg, and the Cu content is 398.62mg / kg. The leaching situation of the heavy metal-contaminated bottom mud for testing is shown in Table 1 below, and the photo of its microstructure is shown in figure 2 shown.

[0021] Table 1: The leaching toxicity (mg / L) of the heavy metal polluted bottom mud for testing in the embodiment

[0022]

[0023] Add DTCR to the heavy metal-contaminated bottom mud, stir thoroughly for 30 minutes, and then add cement. The mixing amount of DTCR and cement is shown in Table 2. Stir the obtained mixture until uniform, and then add it into a cube mold of 100mm×100mm×100mm. The addition process is carried out on a vibrating ...

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Abstract

The invention relates to a method for solidifying-stabilizing bottom mud polluted by heavy metals by using cement and organic sulfides and application of an obtained solidified body. The method comprises the steps of adding aminodithioformic acid into the bottom mud polluted by heavy metals, stirring fully, adding cement, stirring the obtained mixture uniformly, and curing for 3d-14d to obtain the solidified body, so that a solidifying-stabilizing process is completed. The method has the advantages that the usage amount of the cement can be reduced, the cost is reduced, the capacity increasing rate of the solidified body is reduced, secondary pollution is avoided, the solidifying-stabilizing effect of the bottom mud polluted by heavy metals is improved, the cured solidified body can be used for landfill disposal or can serve as a building material.

Description

technical field [0001] The invention relates to a solidification-stabilization treatment method for heavy metal-contaminated bottom sludge, in particular to a method for solidifying and stabilizing heavy metal-contaminated bottom sludge with a stabilizer and the application of the obtained solidified body. Background technique [0002] With the rapid development of the industrial economy, the environmental problems caused by industrial wastewater are becoming more and more serious. Pollutants such as heavy metals enter the water body through industrial wastewater discharge, and eventually accumulate in the bottom mud, posing a threat to the water body ecosystem. Therefore, sediment heavy metal pollution has become a worldwide environmental problem. Sediment refers to the surface sediment at the bottom of the water body, which is composed of humus, microorganisms, sediment and soil. Heavy metals can enter the sediment of water bodies through atmospheric dustfall, precipitati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B24/16C02F11/00C02F101/20
Inventor 杨朝晖王川曾光明黄兢汪理科徐海音谢华明
Owner HUNAN UNIV
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