In-situ remediation system and method for synergistically removing organic pollutants of soil and underground water

A technology for in-situ restoration of organic pollutants, applied in the field of environmental pollution control technology and materials, can solve the problems of weak removal of groundwater pollution, long repair time, limited repair effect, etc., to achieve enhanced repair effect, good treatment effect, The effect of avoiding secondary pollution

Active Publication Date: 2017-11-17
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the heat-intensified SVE remediation method has a certain enhancement effect on the remediation of oil-contaminated soils, the remediation effect is very limited for oil pollutants dissolved in the water phase and soil particle adsorption phase, and the remediation time is long; SVE technology is mainly aimed at the removal of volatile and semi-volatile organic pollutants in soil, but has little effect on the removal of groundwater pollution.

Method used

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  • In-situ remediation system and method for synergistically removing organic pollutants of soil and underground water
  • In-situ remediation system and method for synergistically removing organic pollutants of soil and underground water

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Please refer to figure 1 , an in-situ remediation system for synergistically removing organic pollutants from soil and groundwater, including a steam generator 1, a chemical oxidant mixing storage tank 2, an iron-carbon adsorption permeable wall 3, a non-permeable heat insulation board layer 4, a high-pressure injection well 5, The vacuum extraction well 6 and the desorption gas purification treatment device 12; the steam generator 1 and the chemical oxidant mixing storage tank 2 are respectively communicated with the high-pressure injection well 5; the vacuum extraction well 6 is connected with the desorption gas The gas purification treatment device 12 is connected; the vacuum extraction well 6 is located between the two high-pressure injection wells 5; the non-permeable heat insulation plate layer 4 is laid on the top of the polluted soil area; the iron-carbon adsorption permeable wall 3 Longitudinal excavation downstream of the groundwater in the contaminated soil a...

Embodiment 2

[0044] Remediation of petroleum- and methyl-tert-butyl ether (MTBE)-contaminated soil and simulated groundwater under laboratory conditions. A plexiglass container with a length, width and height of 1:0.5:0.5 (m) is filled with coarse sand, medium sand, fine sand and clay to simulate the groundwater with MTBE dissolved at 0.3m below the surface. The high-pressure injection well 5 and the vacuum extraction well 6 are heat-resistant pipes with holes embedded in soil layers of different depths. The high-pressure injection well 5 is connected to the chemical oxidant mixing storage tank 2 and the steam generator 1. The desorption gas purification treatment device 12 is connected. The container cover is used as a non-permeable heat insulation board to seal the experimental container, and the interface between the heat-resistant tube and the container cover is sealed with Vaseline. A sampling port and an outlet for simulating groundwater are reserved at the bottom of the experimenta...

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Abstract

The invention discloses an in-situ remediation system and method for synergistically removing organic pollutants of soil and underground water. The method comprises the following steps: uniformly injecting chemical oxidants in chemical oxidant mixing storage tank into the soil and the underground water; generating high-temperature steam through a steam generator, and injecting the high-temperature steam into the soil and the underground water; starting a vacuum pump to extract gas from a vacuum extraction well, forming negative pressure in the well, and promoting desorption of volatile and semi-volatile organic compounds from the soil; and treating and discharging the volatile and semi-volatile organic compounds through a gas-liquid separation tank and an activated carbon adsorption tank. The high-temperature steam heat can activate the chemical oxidants so that degradation and removal of the organic pollutants in the underground water can be further accelerated, the underground water organic pollutants which are not completely degraded are further adsorbed, intercepted and degraded through an iron carbon adsorption permeation wall, so that the purpose of synergistically remediating the soil and the underground water is achieved, and secondary pollution of the soil and the underground water is avoided.

Description

technical field [0001] The invention relates to the field of environmental pollution control technology and material technology, in particular to an in-situ repair system and method for collaboratively removing organic pollutants in soil and groundwater. Background technique [0002] The rapid development of industry and agriculture, the leakage of environmental pollutants and the random discharge of environmental pollutants have led to increasingly prominent soil and groundwater pollution. These environmental pollution problems have seriously restricted the sustainable development of the country's economy and society, and affected people's health. Among these pollution factors, pollutants such as petroleum, chemical raw materials and pesticides appear frequently. These pollutants include not only hydrophobic volatile and semi-volatile organic compounds, but also some water-soluble organic pollutants. These pollutants enter the soil medium and then enter the groundwater envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08B09C1/06
CPCB09C1/00B09C1/002B09C1/06B09C1/08B09C2101/00
Inventor 杜江坤
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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