In-situ remediation method for underground water and soil of polluted site

An in-situ remediation and groundwater technology, applied in the field of in-situ remediation of groundwater and soil, can solve the problems of adsorbing pollutants and re-releasing pollution plume diffusion

Active Publication Date: 2021-09-10
ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the injection process of this technology, when the agent is injected into the ground under external pressure, it is easy to cause the re-release of the adsorbed pollutants in the soil and the further spread of the pollution plume.

Method used

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  • In-situ remediation method for underground water and soil of polluted site
  • In-situ remediation method for underground water and soil of polluted site
  • In-situ remediation method for underground water and soil of polluted site

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This example is used to verify the effect of the combined use of zero-valent iron and the microelectronic donor composition

[0060] The contaminated groundwater and aquifer soil samples used in this example were collected in a polluted area of ​​an abandoned organic solvent factory in Beijing. After the samples were collected, they were refrigerated for future use.

[0061] According to the different experimental groups set up in Table 1, measure 100mL of groundwater, 25g of soil sieved through a 2mm sieve, and other reagents required, place them in a nitrogen-purged serum bottle, and quickly replace them with an aluminum cap with a Teflon liner. Press and seal the serum bottle tightly, and then place it in a dark environment at 15-20°C.

[0062] Table 1 Experimental group settings

[0063]

[0064]

[0065] Place each experimental group in Table 1 for 90 days respectively, and in the system of each experimental group after 90 days, the nitrate and sulfate radic...

Embodiment 2

[0072] In this embodiment, an experimental group treated with the in-situ repair method of the present invention and a control group repaired with the traditional repair method were respectively set up to compare and verify the effect of the in-situ repair method of the present invention.

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Abstract

The invention relates to an in-situ remediation method for underground water and soil of a polluted site. The method comprises the following steps: injecting first composite slurry into a water layer or a soil layer located at the pollution plume boundary, and enabling the pollution plume boundary to be covered with the first composite slurry; and injecting second composite slurry into a water-containing layer or a soil layer of the pollution source area, and enabling the second composite slurry and the first composite slurry to cover the polluted site, wherein the first composite slurry and the second composite slurry both contain montmorillonite, zero-valent iron and a trace electron donor composition, and the content of the montmorillonite in the first composite slurry is greater than that of the second composite slurry. According to the method, a flexible in-situ barrier reaction zone is formed at the boundary of the pollution plume boundary , the pollution area is blocked while remediation is carried out, and secondary pollution caused by further diffusion of the pollution plume is prevented; meanwhile, the second composite slurry is injected into the pollution source area, the underground environment is improved, salt pollution in soil and underground water is rapidly eliminated, and efficient remediation in the original pollution source area is achieved.

Description

technical field [0001] The invention relates to the technical field of groundwater restoration, in particular to an in-situ restoration method for groundwater and soil in polluted sites. Background technique [0002] Nitrate and sulfate are the main ion components that make up most natural water bodies. Because they can have adverse effects on the human body at high concentrations, all countries have certain restrictions on them. Groundwater and soil quality have deteriorated around the world over the past few decades due to nitrate pollution from heavy use of fertilizers, discharge of untreated municipal and industrial wastewater, and atmospheric deposition. Likewise, groundwater and soils are increasingly affected by sulfate pollution from discharges of domestic, urban and industrial wastewater, as well as from seawater intrusion, atmospheric deposition, mineral dissolution and acid rain. Therefore, the restoration of groundwater and soil has gradually attracted people's ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/20C02F1/28C02F1/70C02F3/28C02F3/34B09C1/00B09C1/08B09C1/10C02F103/06
CPCB09C1/002B09C1/08B09C1/10C02F1/705C02F3/28C02F1/20C02F3/347C02F1/281C02F1/286B09C2101/00C02F2103/06C02F2301/08Y02W10/10
Inventor 吴乃瑾李培中王海见李翔荣立明张骥宋久浩李艺宋云
Owner ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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