Linkage stabilizing agent for repairing heavy metal contaminated soil and repairing method

A technology for polluted soil and heavy metals, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc. Long-term, low construction cost, small addition ratio

Active Publication Date: 2016-01-13
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some problems may arise in the process of application: for example, when the heavy metal content in the polluted soil is high, the amount of stabilizer agent is large and the cost is high; Common stabilizers have little or no effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The implementation is as follows:

[0034] (1) First mix the mixed agent of ferrous sulfate and montmorillonite (one dose) into one dose according to the mass ratio: soil = 2.5:100 (ferrous sulfate 2, montmorillonite 0.5) and stir for reaction, and curing 20min;

[0035] (2) Mix sodium sulfide, calcium hydroxide, calcium oxide and silicon dioxide mixed agent (two doses) into two doses according to the mass ratio: soil = 2:100 (sodium sulfide 1, calcium hydroxide 0.5, calcium oxide 0.25, silicon dioxide 0.25) stirring reaction, and curing 1d;

[0036] (3) Adopt "Diphenylcarbahydrazide Spectrophotometric Method for Determination of Hexavalent Chromium in Solid Waste" (GB / T15555.4-1995), "Atomic Absorption Spectrophotometric Method for Determination of Water Quality Copper, Zinc, Lead and Cadmium" ( GBT7475-87) To test the heavy metal leaching toxicity of the cured samples.

[0037] The results show that the leaching concentrations of heavy metals in the treated samples...

Embodiment 2

[0039] The implementation is as follows:

[0040] (1) First mix ferrous sulfate and montmorillonite (one dose) in a mass ratio of one dose: soil = 1:100 (ferrous sulfate 0.7, montmorillonite 0.3) and stir for reaction, and curing 20min;

[0041] (2) Mix sodium sulfide, calcium hydroxide, calcium oxide and silicon dioxide mixed agent (two doses) into two doses according to the mass ratio: soil = 1.5:100 (sodium sulfide 0.8, calcium hydroxide 0.3, calcium oxide 0.2, silicon dioxide 0.2) stirring reaction, and curing 1d;

[0042] (3) Adopt "Diphenylcarbahydrazide Spectrophotometric Method for Determination of Hexavalent Chromium in Solid Waste" (GB / T15555.4-1995), "Atomic Absorption Spectrophotometric Method for Determination of Water Quality Copper, Zinc, Lead and Cadmium" ( GBT7475-87) To test the heavy metal leaching toxicity of the cured samples.

[0043] The results show that the leaching concentrations of heavy metals in the treated samples are 1.05mg / L of hexavalent chr...

Embodiment 3

[0045] The implementation is as follows:

[0046] (1) First, mix ferrous sulfate and montmorillonite (one dose) in a mass ratio of one dose: soil = 2.3:100 (ferrous sulfate 1.5, montmorillonite 0.8) and stir for reaction, and curing 20min;

[0047] (2) Mix sodium sulfide, calcium hydroxide, calcium oxide and silicon dioxide mixed agent (two doses) into two doses according to the mass ratio: soil = 1:100 (sodium sulfide 0.5, calcium hydroxide 0.25, calcium oxide 0.13, silicon dioxide 0.12) stirring reaction, and curing 1d;

[0048] (3) Adopt "Diphenylcarbahydrazide Spectrophotometric Method for Determination of Hexavalent Chromium in Solid Waste" (GB / T15555.4-1995), "Atomic Absorption Spectrophotometric Method for Determination of Water Quality Copper, Zinc, Lead and Cadmium" ( GBT7475-87) To test the heavy metal leaching toxicity of the cured samples.

[0049] The results show that the leaching concentrations of heavy metals in the treated samples are 0.07mg / L of hexavalent...

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PUM

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Abstract

The invention discloses a linked stabilizing agent for repairing heavy metal contaminated soil and a repairing method thereof. The linkage stabilizing agent comprises: a first agent comprising ferrous sulfate and montmorillonite, and a second agent comprising sulfide, calcium hydroxide, calcium oxide and silicon dioxide. The repairing method comprises the following steps of: (1) adding the first agent to the heavy metal contaminated soil, and stirring the first agent and the heavy metal contaminated soil for maintenance; and (2) adding the secondary agent to a mixture obtained in the step (1), and stirring the secondary agent and the mixture for maintenance. The linkage stabilizing agent disclosed by the invention is obvious on treatment effects of complex heavy metal contaminated soil or substrate sludge, is long-lasting in heavy metal stabilization effects, and besides, secondary pollution cannot be caused; the linkage stabilizing agent is small in addition proportion and low in construction cost and has obvious economic benefits.

Description

technical field [0001] The invention belongs to the field of hazardous waste treatment and disposal, and relates to a stabilizer and a method for treating hazardous waste containing heavy metals, in particular to a linkage stabilizer and a repair method for repairing heavy metal-contaminated soil, which can stabilize complexed heavy metals in a medium, reduce its dissolution rate. Background technique [0002] With the advancement of the country's urbanization process and the development of industry and agriculture, a large amount of heavy metal wastewater and heavy metal sludge with high moisture content (moisture content of 70-80%) produced in the industry pollute the surrounding soil. [0003] For example, in the 1980s, the production mode of my country's electroplating industry was mostly extensive production. During the electroplating production process, there are many sections that produce production wastewater with a high concentration of pollutants. Among them, chro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06C09K17/08B09C1/08C09K109/00
Inventor 吕正勇魏丽冯国杰张培李淑彩朱湖地刘勇刘泽军甄胜利龙少鹏
Owner BEIJING GEOENVIRON ENG & TECH
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