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A microbial-electric two-stage remediation method for oil-contaminated soil

A technology for oil pollution and polluted soil, applied in the field of environmental governance, can solve the problems of low colloidal asphaltene degradation efficiency, increased proportion of colloidal asphaltene, and reduced microbial remediation efficiency, etc., to achieve shortened processing time, low cost, and reduced The effect of energy consumption

Active Publication Date: 2016-09-28
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, microbial remediation is greatly affected by the characteristics of soil pollutants. Microorganisms can preferentially degrade alkanes and aromatics in petroleum hydrocarbons, while the degradation efficiency of colloidal asphaltenes is extremely low or even impossible, which leads to a sharp decline in alkanes and aromatics in the soil. The proportion of asphaltenes increases
The large accumulation of colloidal asphaltenes will inhibit the growth of microorganisms and reduce the efficiency of microbial remediation. Therefore, it is difficult to completely remediate oil-contaminated soils solely by biological methods, and it is necessary to combine other technologies to strengthen the removal of heavy components.

Method used

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  • A microbial-electric two-stage remediation method for oil-contaminated soil
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  • A microbial-electric two-stage remediation method for oil-contaminated soil

Examples

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Effect test

Embodiment 1

[0024] Example 1 Remediation of oil-contaminated soil in Liaohe Oilfield

[0025] The contaminated soil used in the test was collected from the surrounding area of ​​the Liaohe Oilfield well site (Panjin, Liaoning). Remove impurities from the collected soil, air-dry it, and grind it through a 20-mesh sieve for later use. The total organic carbon content in the soil is 5.21%, the total petroleum hydrocarbon content is 3.45%, and the total petroleum hydrocarbon content / total organic carbon content is 0.66.

[0026] Before the microbial-electric two-stage remediation, the organic fertilizer with high organic carbon content was evenly mixed into the contaminated soil, and the total petroleum hydrocarbon content / total organic carbon content in the soil was determined to be 0.45. The prepared polluted soil is packed into a soil chamber with a length of 30 cm, a width of 24 cm, and a height of 15 cm.

[0027] In this embodiment, 3 treatments were set up, which were single microbial...

Embodiment 2

[0030] Example 2 Restoration of Petroleum Contaminated Soil in Shengli Oilfield

[0031] The contaminated soil used in the test was collected from the surrounding area of ​​the Shengli Oilfield (Dongying, Shandong). Remove impurities from the collected soil, air-dry it, and grind it through a 20-mesh sieve for later use. The total organic carbon content in the soil is 6.71%, the total petroleum hydrocarbon content is 2.82%, and the total petroleum hydrocarbon content / total organic carbon content is 0.42.

[0032] Present embodiment establishes 3 processings, is respectively independent microbial treatment, independent electrokinetic treatment and microorganism-electrokinetic two-stage processing, and concrete conditions are shown in Table 2. Microbial treatment and inoculation of cultured petroleum hydrocarbon degrading bacteria, the inoculum size is 6.8×10 8 cfu / g dry soil. Electric treatment does not inoculate petroleum hydrocarbon degrading bacteria, but applies a direct...

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Abstract

The invention belongs to the technical field of environmental treatment and in particular relates to a microorganism-electric power two-segment repairing method for petroleum contaminated soils. According to the microorganism-electric power two-segment repairing method disclosed by the invention, conversion between two segments including microorganism repairing and electrokinetic repairing is carried out with the ratio of the total petroleum hydrocarbon content and the total organic carbon content in contaminated soils, and the purpose of preparing the petroleum contaminated soils is achieved; microorganisms are capable of preferentially degrading light components which are easily degraded in petroleum hydrocarbon and then removing heavy components by virtue of the strengthening effect of an electric field, and staged degradation of pollutants is realized; the problem that the pollutants can not be completely degraded by virtue of single microorganisms is solved, and the energy consumption by virtue of single electrokinetic remediation is also lowered; the microorganism-electric power two-segment repairing method is rapid in speed for repairing the petroleum contaminated soils, high in efficiency and low in cost; and compared with single microorganism repairing and single electrokinetic repairing, the efficiency is improved by above 20-40 percent.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to a microbial-electric two-stage restoration method for petroleum-contaminated soil. Background technique [0002] Soil oil pollution has become an environmental problem that cannot be ignored, and oil-contaminated soil remediation has received high attention both at home and abroad. Currently available restoration techniques include physical restoration techniques, chemical restoration techniques and biological restoration techniques. Bioremediation technology usually refers to microbial remediation, which is a remediation technology developed on the basis of microbial degradation. Compared with physical and chemical remediation technologies, it has the characteristics of low cost, no damage to the soil environment, no secondary pollution, and simple operation. . However, microbial remediation is greatly affected by the characteristics of soil polluta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 郭书海李凤梅王卅杨雪莲张俊锋
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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