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In-situ chemical oxidation restoration method for chlorinated olefin-polluted soil and underground water

An in-situ chemical oxidation and chlorinated olefin technology, applied in the restoration of contaminated soil, oxidized water/sewage treatment, etc., can solve the problems of low utilization rate of oxidants, large non-selective consumption, etc., achieve good treatment effect, no The effect of secondary pollution and short repair period

Active Publication Date: 2012-12-26
HUAQIAO UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low oxidant utilization rate, large non-selective consumption, and mass transfer of oxidant in the process of removing groundwater TCE by in-situ chemical oxidation of potassium permanganate, the object of the present invention is to provide a method for chlorinated olefin-contaminated soil and groundwater. in situ chemical oxidation repair method

Method used

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  • In-situ chemical oxidation restoration method for chlorinated olefin-polluted soil and underground water
  • In-situ chemical oxidation restoration method for chlorinated olefin-polluted soil and underground water
  • In-situ chemical oxidation restoration method for chlorinated olefin-polluted soil and underground water

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Measure the TCE solution with an initial concentration of about 10mg / L in a 120.00mL conical flask, adjust the pH value to about 6.8 with 0.1mol / L hydrochloric acid solution and 0.1mol / L NaOH solution, and add 1.8g compound permanganate Potassium sustained-release body (both ends of the slow-release body are sealed with paraffin, containing 0.5g KMnO 4 ), oxidize, oscillate at a constant temperature of 25°C, make the coated potassium permanganate fully contact with TCE, take samples regularly, quench with sodium thiosulfate to prevent potassium permanganate from continuing to react with TCE, and finally mix the sample with 0.45 Filter through a μm water-based filter membrane into an autosampler bottle and put it into a liquid chromatograph to measure the remaining TCE concentration. To study the long-term effect of compound potassium permanganate slow-release body to remove TCE, such as figure 1 shown. Potassium permanganate sustained release for 10 cycles. After 10 ...

Embodiment 2

[0018] Cooperate figure 2 As shown, the total length of the reaction tank is 140cm, the width is 40cm, and the height is 45cm. The material is ordinary glass. The entire reaction tank is divided into five functional areas:

[0019] (1) Zone I is the water inlet pool, with a size of 10×40×45cm;

[0020] (2) Zone II is a simulated aquifer polluted area with a size of 20×40×45cm, filled with 40-70 mesh silica sand, and the filling height is 35cm. The basic properties of silica sand are shown in Table 4-2;

[0021] (3) Area III is a chemical reaction wall (PRB), with a size of 4×40×45cm, made of acrylic board, and 16 holes with a diameter of 8mm on each side wall. The entire PRB can be pulled out to replace the medium inside, and the operation is simple and convenient, thus solving the problem of replacing the active medium when the PRB fails.

[0022] (4) Area IV is a sandy soil area with a size of 96×40×45cm, filled with 40-70 mesh silica sand, and the filling height is 35c...

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Abstract

The invention discloses an in-situ chemical oxidation restoration method for chlorinated olefin-polluted soil and underground water, comprising the following steps of: putting a permeable reactive barrier in a reactive tank and transversely arranging a compound potassium permanganate release system in the permeable reactive barrier, wherein the compound potassium permanganate release system is prepared from paraffin, silica sand and potassium permanganate; then diluting a high-concentration TCE (Trichloroethylene) liquor on line to keep the concentration of chlorinated olefin between 0mg / L and 100mg / L, controlling the flow speed of the TCE liquor in the reactive tank at 71.4cm / d, and guiding the TCE liquor to flow in from the water inlet end of the reactive tank and flow out from the water outlet end of the reactive tank after flowing through the permeable reactive barrier to finish water treatment. When the method is used for water treatment, the removal rate of TCE after two days can reach 100% and the removal rate of the TCE can be kept at 100% through continuously restoring for thirty-three days. The method disclosed by the invention has a short restoration cycle and no secondary pollution and can be used for restoration for a long term; the potassium permanganate, the paraffin and the silica sand are cheap and easy to get; and a good chlorinated olefin treatment effect can be achieved on the premise of rational cost so that the prospect is broad.

Description

field of invention [0001] The invention relates to an in-situ chemical oxidation restoration method for soil and groundwater polluted by chlorinated olefins. Background technique [0002] Chlorinated olefins are widely used in aircraft engines, auto parts, electronic components, and degreasing of clothes, among which trichlorethylene and tetrachlorethylene (TCE and PCE) are persistent in the environment and have strong toxicity to organisms It is carcinogenic and has been included in the US Environmental Protection Agency's priority control pollutants, China's environmental priority monitoring and control pollutants, and the "blacklist" announced by the European Union. Chlorinated olefins are non-aqueous heavy water compounds. After being discharged into the environment, after passing through the seepage zone, air-permeable layer, and saturated water layer, they migrate downward to the surface of the impermeable layer and accumulate here to form a unique pollution zone. (so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C02F1/72
Inventor 苑宝玲付明来曾秋生
Owner HUAQIAO UNIVERSITY
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