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Low-energy-consumption soil organic pollutant in-situ treatment method and system

A technology for in-situ treatment of organic pollutants, applied in the restoration of contaminated soil, etc., can solve problems such as energy waste and poor efficiency, and achieve the effects of avoiding waste of energy, reducing the burden of treatment, and enhancing the treatment effect

Active Publication Date: 2021-03-26
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved is: in the existing soil in-situ heating technology, a large amount of energy is wasted on the phase change of water in the soil, and the efficiency is extremely poor when the concentration of organic pollutants is low

Method used

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  • Low-energy-consumption soil organic pollutant in-situ treatment method and system
  • Low-energy-consumption soil organic pollutant in-situ treatment method and system
  • Low-energy-consumption soil organic pollutant in-situ treatment method and system

Examples

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Embodiment 1

[0058] Organophosphorus pesticide (cas number 13074-13-0) contaminated site remediation in situ. Heating area heating and cooling process monitoring such as image 3 shown. After heating up for 45 days, reach the target temperature of 95°C, then inject lye to hydrolyze organophosphorus pesticides into various small molecular substances such as phosphate, nitrite, sulfide, methanol, and small molecule polyphenols, and keep warm for 3 months . Such as Figure 4 , during the extraction process, the underground pollutants were quickly extracted, and the concentration of pollutants in the tail liquid first increased to a peak of 10963.4ppb due to heating and released from soil particles, and then dropped rapidly, and decreased to 722.4 on the 135th day after the end of the extraction. ppb. After the heating is stopped, the temperature begins to drop slowly, and when the temperature of the heating area drops to 75°C, the oxidant fluid is injected to start the thermally enhanced ...

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Abstract

The invention relates to the technical field of restoration of contaminated soil, and discloses a low-energy-consumption soil organic pollutant in-situ treatment method and system. According to the method, most of organic pollutants easy to migrate are extracted through heat strengthening, and then chemical fluids such as an oxidizing agent and alkali liquor are injected for thermochemical degradation so as to treat residual low-concentration organic pollutants; and finally, a microbial nutrient solution is injected in the cooling stage to enable organic pollutant degrading bacteria to becomedominant species in the contaminated soil so as to further consolidate the treatment effect. Various different pollutant treatment modes are effectively coupled together, the advantages of various treatment modes are fully utilized, each pollutant treatment mode has a beneficial effect on the next pollutant treatment mode, and the energy consumption for treating organic pollutants in soil is effectively reduced on the premise that the same or even better treatment effect is achieved.

Description

technical field [0001] The invention relates to the technical field of restoration of polluted soil, in particular to a method and system for in-situ treatment of soil organic pollutants with low energy consumption. Background technique [0002] Affected by petrochemical production for a long time, large areas of soil and groundwater have been polluted by organic compounds such as petroleum, durian oil, coal tar, chlorinated solvents, and pesticides. Among them, the pollution source formed by organic pollutants accumulated in non-water-soluble liquids (NAPLs) in porous media is the most difficult to repair, and the damage caused to the environment cannot be restored to an uncontaminated state through self-purification in a short period of time, and the pollution can last for several years. Ten years or even hundreds of years. With the prolongation of the exposure time of NAPLs in soil and groundwater, the volatile components, such as chlorinated solvents and light petroleum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B09C1/08B09C1/10
CPCB09C1/06B09C1/08B09C1/10B09C1/005B09C2101/00
Inventor 韦云霄闫利刚郭丽莉李书鹏宋子钰张家铭赵朋
Owner BCEG ENVIRONMENTAL REMEDIATION CO LTD
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