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A kind of soil oxidation-solidification stabilization repair agent and its application method

A technology for remediating chemicals and soil, applied in the environmental field, can solve the problems of no oxidation effect, difficult to deal with organic-heavy metal composite polluted soil, and metal sulfides cannot be stabilized, and achieves good curing effect, simple components, Easy-to-use effects

Active Publication Date: 2019-12-10
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing solidification and stabilization soil remediation technologies usually do not have an oxidation effect, and it is difficult to deal with organic-heavy metal compound polluted soil. At the same time, the stabilization effect cannot be achieved for metal sulfides with redox activity. Therefore, need to innovate

Method used

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  • A kind of soil oxidation-solidification stabilization repair agent and its application method
  • A kind of soil oxidation-solidification stabilization repair agent and its application method
  • A kind of soil oxidation-solidification stabilization repair agent and its application method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Take the polluted soil of a PVC production enterprise, and measure the content of various heavy metals and total natural organic matter (NOM) in the soil. The measurement results of heavy metals are shown in Table 1. It can be found that the mercury content therein exceeds the limit value of 1.5 mg / kg for the mercury content in the third-grade soil in the "Soil Environmental Quality Standard" (GB15618-1995), and the organic matter content of the soil is 6 g / Kg simultaneously.

[0027] Table 1 The content of heavy metals in the soil and the standard limit of the third grade soil mg / kg

[0028]

[0029] The oxidation-curing stabilizing and repairing agent used in this embodiment selects micron-sized zero-valent iron, sodium disilicate and calcium oxide.

[0030] First, crush the retrieved heavy metal-contaminated soil, put it into a plastic cylinder, add a solution of 10mmol / L sodium disilicate and an appropriate amount of micron zero-valent iron, and stir fully while ...

Embodiment 2

[0033] The oxidation-solidification stabilizing remediation agent used in this embodiment selects nano-scale zero-valent iron, sodium disilicate and calcium oxide to remediate arsenic-contaminated soil.

[0034] First, crush the heavy metal-contaminated soil retrieved, put it into a plastic cylinder (take a part first to test its total organic carbon content (TOC)), add 20mmol / L sodium disilicate solution and an appropriate amount of nanometer zero-valent iron, and add While fully stirring, the soil becomes muddy. Continue to stir continuously, and carry out proper aeration. After half an hour, add calcium oxide gradually, and then stir for 10 minutes. See the experimental device and brief process figure 2 . Afterwards, the mud is placed in a constant temperature curing box at 60°C and relative humidity <25% for digestion and molding until the mud is completely dry and has a certain strength. Digest and shape for 36 hours, then cool down naturally for crushing. At the end ...

Embodiment 3

[0039] The oxidation-solidification stabilization and remediation agent used in this embodiment selects micron-sized zero-valent iron, sodium disilicate and calcium oxide to remediate chromium-contaminated soil.

[0040] First, crush the retrieved heavy metal-contaminated soil, put it into a plastic cylinder, add a solution of 15mmol / L sodium disilicate and an appropriate amount of micron zero-valent iron, and stir fully while adding, the soil becomes muddy. Continue to stir continuously, and carry out proper aeration. After half an hour, add calcium oxide gradually, and then stir for 15 minutes. See the experimental device and brief flow figure 2 . Afterwards, the mud is placed in a constant temperature curing box at 60°C and relative humidity <25% for digestion and molding until the mud is completely dry and has a certain strength. Digest and shape for 36 hours, then cool down naturally for crushing.

[0041] After the soil treated with solidification and stabilization ha...

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Abstract

The invention provides a soil oxidization-solidification and stabilization remediation agent and an application method of the soil oxidization-solidification and stabilization remediation agent. The soil oxidization-solidification and stabilization remediation agent comprises zero-valent iron, silicate and calcium oxide, wherein zero-valent iron, silicate and calcium oxide are independently packaged. By means of the process of activation of molecular oxygen in zero-valent and a disilicate system, oxidizing removal of organic matter in contaminated soil is achieved, and the interference of the organic matter to the soil solidification and stabilization process is reduced. Meanwhile, the mobility of reducing substances possibly existing in heavy metal contaminated soil, such as arsenious acid groups, selenious acid groups and sulfur ions is greatly reduced through oxidization. Then calcium oxide / calcium hydroxide is added, and stabilization and immobilization of heavy metal ions such as copper, lead, cadmium and mercury are achieved through iron minerals formed by residual zero-valent iron and calcium silicate compounds. The soil oxidization-solidification and stabilization remediation agent can conduct oxidization-solidification and stabilization on the heavy metal contaminated soil or organic matter and heavy metal combined contaminated soil with different contamination degrees, and products formed after solidification and stabilization can be used for backfilling or other purposes.

Description

technical field [0001] The invention belongs to the field of environmental technology, and in particular relates to a soil oxidation-solidification stabilization and restoration agent and a use method thereof. Background technique [0002] With the acceleration of our country's industrialization process, the rapid development of industry has improved the material and cultural living standards of human beings on the one hand, and caused serious pollution to the environment on the other hand. Soil heavy metal pollution is a major problem of environmental pollution. Soil is an important part of the ecological environment and one of the most precious resources for human survival. Its regeneration is extremely slow. Due to domestic sewage discharge, polluted irrigation, atmospheric deposition, mining and smelting, and extensive use of pesticides and fertilizers, soil pollution, especially heavy metal pollution, is becoming more and more serious. The heavy metals entering the so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 毛旭辉崔佳鑫周旻朱华侯浩波汪的华
Owner WUHAN UNIV
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