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A method for the combined degradation of polycyclic aromatic hydrocarbon pollutants in soil by chemical oxidation and anaerobic microorganisms

An anaerobic microorganism and polycyclic aromatic hydrocarbon technology, which is applied in the field of PAHs-contaminated soil remediation, can solve problems such as uneven transport of reactants, and achieve the effects of reducing remediation costs, good application prospects and high remediation efficiency.

Active Publication Date: 2021-07-27
北京市科学技术研究院资源环境研究所
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Problems solved by technology

However, the application of Fenton oxidation alone will cause a series of follow-up problems: due to the heterogeneity of soil and aquifer, the reactant transport is uneven, and unoxidized PAHs (polycyclic aromatic hydrocarbons) and reaction intermediates still remain in the soil environment.
However, PAHs (polycyclic aromatic hydrocarbons) pollution mainly accumulates in deep soil, and deep soil is often in anaerobic or anoxic state, and the role of anaerobic degradation of PAHs (polycyclic aromatic hydrocarbons) in deep soil cannot be ignored

Method used

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  • A method for the combined degradation of polycyclic aromatic hydrocarbon pollutants in soil by chemical oxidation and anaerobic microorganisms
  • A method for the combined degradation of polycyclic aromatic hydrocarbon pollutants in soil by chemical oxidation and anaerobic microorganisms
  • A method for the combined degradation of polycyclic aromatic hydrocarbon pollutants in soil by chemical oxidation and anaerobic microorganisms

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Embodiment approach

[0020] A specific technical implementation scheme that the present invention adopts comprises the following steps:

[0021] 1) Collection and preparation of experimental soil: Select a typical coking site, collect soil 3-4 meters underground, pass through a 2mm sieve, seal and store at 4°C for later use.

[0022] 2) Oxidation of soil samples with hydrogen peroxide: 100 g of soil and 150 mL (10%, w / w) of hydrogen peroxide were placed in a 1L beaker, and stirred with a magnetic stirrer to fully oxidize the soil to obtain an oxidized soil sample.

[0023] 3) Inoculation of microorganisms: 10% (w / w) of unoxidized soil was added to the oxidized soil sample and mixed evenly to obtain an inoculated soil sample.

[0024] 4) Soil anaerobic loading: In a nitrogen-filled glove box (anaerobic environment), transfer the oxidized soil and the inoculated soil to a 50 mL container equipped with a Teflon-lined butyl rubber stopper and an aluminum sealing cap. In the serum bottle, press the ca...

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Abstract

A method for degrading PAHs (polycyclic aromatic hydrocarbons) pollutants in soil by using a combined chemical oxidation-anaerobic microorganism method, mainly comprising the following steps: (1) chemical pre-oxidation treatment of PAHs (polycyclic aromatic hydrocarbons) contaminated soil; (2) ) on the anaerobic microbial culture of PAHs (polycyclic aromatic hydrocarbons) contaminated soil pretreated by chemical oxidation. This method combines the advantages of chemical oxidation and anaerobic microbial degradation. First, the PAHs in soil are degraded to a lower concentration level (toxic level) in a relatively short time, and then the remaining PAHs are degraded under milder conditions. Solve the problem of pollutant tailing in soil after chemical oxidation, and by adding electron acceptor (NO 3 ‑ ) and nutrients, etc., an economical and feasible remediation technology that utilizes indigenous microorganisms in soil to degrade PAHs in soil after chemical oxidation, and has broad application prospects.

Description

technical field [0001] The invention belongs to the field of remediation of PAHs (polycyclic aromatic hydrocarbons) polluted soil, relates to a method for degrading PAHs (polycyclic aromatic hydrocarbons) pollutants in soil by using a combined chemical oxidation-anaerobic microorganism method, and belongs to the chemical oxidation-microbial in-situ remediation technology. Background technique [0002] PAHs (Polycyclic Aromatic Hydrocarbons) are common persistent organic pollutants in industrial sites, and have been included in the list of priority pollutants by the US Environmental Protection Agency because of their carcinogenicity, teratogenicity and genotoxicity. In-situ chemical oxidation is mainly by injecting chemical oxidants (such as ozone, permanganate, Fenton (type) reagents and activated persulfate, etc.) into groundwater or soil to react to degrade target pollutants. The chemical oxidative degradation of PAHs (polycyclic aromatic hydrocarbons) contaminated soil is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/08B09C1/10B09C2101/00
Inventor 苟雅玲杨苏才宋云李培中程言君
Owner 北京市科学技术研究院资源环境研究所
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