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Heavy metal contaminated underground water in-situ repair material and preparation method thereof

An in-situ restoration and groundwater technology, which is applied in the field of environmental pollution control and restoration, can solve problems such as easy settlement and poor stability, and achieve the effect of increasing stability, high stability, and repairing heavy metal pollution

Inactive Publication Date: 2015-06-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on magnesium hydroxide at home and abroad is mainly focused on the treatment of surface water pollution, and there are few reports on the remediation of soil and groundwater pollution. Therefore, it is necessary to study magnesium hydroxide for underground environment remediation.
However, the stability of the magnesium hydroxide suspension is very poor, and it is easy to settle, so it needs to be modified

Method used

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  • Heavy metal contaminated underground water in-situ repair material and preparation method thereof
  • Heavy metal contaminated underground water in-situ repair material and preparation method thereof
  • Heavy metal contaminated underground water in-situ repair material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Performance comparison of magnesium hydroxide suspension before and after modification

[0043] Transfer 50ml of the No. 1-5 sample and the unmodified magnesium hydroxide suspension to a 50ml colorimetric tube. After standing for 3 hours, no delamination occurred in the No. 1-5 samples, while the unmodified magnesium hydroxide The suspension was clearly stratified. Such as figure 1 It is the photo of No. 5 sample and the suspension of equal concentration of unmodified magnesium hydroxide after standing for 3 hours. Put the No. 5 sample and the unmodified magnesium hydroxide suspension under a microscope for observation, the results are as follows: figure 2 Shown: the modified magnesium hydroxide has good dispersion and less agglomeration. However, unmodified magnesium hydroxide particles were seriously agglomerated. Carry out particle size analysis to No. 5 sample, the result is as follows image 3 Shown: 90% of the magnesium hydroxide particles are below 1 μm, an...

Embodiment 2

[0045] Effect of Modified Magnesium Hydroxide on Removal of Heavy Metal Lead

[0046] Simulated exposure to Pb under laboratory conditions 2+ Contaminated groundwater environment by adding Pb to distilled water 2+ Preparation of Pb 2+ Pollution of groundwater, Pb in the system 2+ The concentration is 50mg / L, and the system volume is 500ml. Samples 1 to 5 are added to the system respectively. The whole reaction was carried out at low temperature (10° C.) and under airtight and light-tight conditions. The mixture was centrifuged to take the supernatant, and the Pb in the supernatant was measured 2+ concentration. Taking sample No. 2 as an example, the result is as follows Figure 4 Shown: As the concentration of magnesium hydroxide increases, Pb 2+ The removal rate of the sample increased gradually, and when the dosage of No. 2 sample was greater than 1ml, the removal rate was close to 100%. Pb when adding other samples 2+ There is no significant difference in the remov...

Embodiment 3

[0048] Effect of Modified Magnesium Hydroxide on Removal of Heavy Metal Chromium(III)

[0049] Simulated exposure to Cr under laboratory conditions 3+ Contaminated groundwater environment, by adding Cr in distilled water 3+ Formulating Cr 3+ Pollution of groundwater, Cr in the system 3+ The concentration is 20mg / L, the system volume is 500ml, and samples No. 1 to No. 5 are added to the system respectively. The whole reaction was carried out at low temperature (10° C.) and under airtight and light-tight conditions. The mixture was centrifuged to take the supernatant, and the Cr in the supernatant was measured 3+ concentration. Taking sample No. 2 as an example, the result is as follows Figure 5 Shown: As the concentration of magnesium hydroxide increases, Pb 2+ The removal rate of the sample increases gradually, and when the dosage of No. 2 sample is greater than 2ml, the removal rate is close to 100%. Pb when adding other samples 2+ There is no significant difference...

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Abstract

The invention relates to a heavy metal contaminated underground water in-situ repair material, namely an OH-sustained-release agent and a preparation method thereof. According to the repairing material, magnesium hydrate colloid is prepared from magnesium hydrate powder used as a raw material, and Twain 80 and sodium dodecyl sulfate (SDS) used as dispersing agents. The material has the advantages of good fluidity, large specific surface area and high stability, is capable of slowly releasing OH<-1>, has a relatively good treatment effect on a plurality of heavy metal ions, has relatively high migration and dispersion performance in porous medium and is suitable for in-situ restoration of the heavy metal contaminated underground water.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control and restoration, and relates to a heavy metal polluted groundwater in-situ repair material-modified magnesium hydroxide slurry and a preparation method thereof. Background technique [0002] Heavy metals and their compounds are one of the main products of inorganic chemical industry, and are widely used in chemical industry, machinery and other industries. For example, lead can be used as a material for sulfuric acid corrosion resistance, X-ray protection, and storage batteries. Its alloy can be used as lead type, bearing, cable foreskin, sports equipment shot and so on. Chromium can be used to make stainless steel, auto parts, tools, magnetic and video tapes, etc. According to statistics, about 15% of the products in my country's national economy are related to chromium and its compounds. In recent years, with the rapid development of the national economy, heavy metal w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/62C02F103/06
Inventor 董军李博文
Owner JILIN UNIV
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