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Restoration method of petroleum-contaminated soil

A technology for oil pollution and restoration methods, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc. It can solve the problems of long time for microbial screening and domestication, damage to soil microbial communities, and unsuitability for large-scale use. , to achieve the effect of reducing technical cost, enhancing repair effect and enhancing activity

Inactive Publication Date: 2018-08-17
SHANGHAI LICHANG ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] These methods can increase the degradation efficiency of microorganisms to oil, but the degradation efficiency still needs to be further improved
In addition, these existing methods are technically complicated, and the screening and domestication of microorganisms take a long time, and the addition of foreign microorganisms will destroy the original microbial community in the soil, so they are not suitable for large-scale use

Method used

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  • Restoration method of petroleum-contaminated soil
  • Restoration method of petroleum-contaminated soil
  • Restoration method of petroleum-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Firstly, the soil is plowed, and the yeast extract powder aqueous solution is sprayed during the plowing process. Control the spraying amount of the yeast extract powder aqueous solution so that the weight of the yeast extract powder is 8% of the total amount of petroleum hydrocarbons in the oil-contaminated soil. After spraying, the moisture content of the soil was 40%, and the soil was turned and mixed evenly. At an ambient temperature of 25-30°C, cure for 30 days (days). Mix it every 5 days during the maintenance period. At the same time, the soil without yeast extract powder was used as the blank control CK, and the CK and the experimental group were maintained under the same moisture content and temperature conditions. The oil content in the soil was measured before and after remediation, and the test results are shown in Table 1.

[0034] Table 1 Test data before and after soil remediation

[0035]

[0036] The content of petroleum hydrocarbons was reduced ...

Embodiment 2

[0038] The oil-contaminated soil remediation method in this example is basically the same as in Example 1, except that the curing time is 20 days. The oil content in the soil was measured before and after remediation, and the test results are shown in Table 2.

[0039] Table 2 Test data before and after soil remediation

[0040]

[0041] After curing for 20 days, the content of petroleum hydrocarbons decreased to 622mg / kg after adding yeast extract powder, and the degradation rate was 73.2%. After the treatment, the petroleum hydrocarbon content of the blank control CK was reduced to 2168mg / kg, and the degradation rate was 6.5%. Compared with curing for 30 days, the oil degradation rates of CK repaired by adding yeast extract powder and blank control were lower. The main reason is that the curing time is short and the microbial degradation is not complete.

Embodiment 3

[0043]Firstly, the oil-contaminated soil is plowed, and the yeast extract powder aqueous solution is sprayed during the plowing process. Control the spraying amount of the yeast extract powder aqueous solution so that the weight of the yeast extract powder is 15% of the total amount of petroleum hydrocarbons in the petroleum-contaminated soil. The ambient temperature is 28-37°C, and the curing time is 35 days. Mix it every 3 days during the maintenance period. At the same time, the soil without yeast extract powder was used as the blank control CK, and the CK and the experimental group were maintained under the same moisture content and temperature conditions. The oil content in the soil was measured before and after remediation, and the test results are shown in Table 3.

[0044] Table 3 Test data before and after soil remediation

[0045]

[0046] The petroleum hydrocarbon content was reduced to 258mg / kg after adding yeast extract powder for restoration, and the degrad...

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Abstract

The invention discloses a restoration method of petroleum-contaminated soil. The restoration method of the petroleum-contaminated soil comprises the following steps that (1) the oil-contaminated soilis ploughed; (2) a nutrient solution is sprayed into the oil-contaminated soil, specifically, the nutrient solution comprises yeast extracts and water, and due to the spraying amount of the nutrient solution, the weight ratio of the yeast extracts to petroleum hydrocarbon in the petroleum-contaminated soil is 0.05-0.5:1; and (3) curing is carried out after the step (2) is ended. The method can beused for restoring the petroleum-contaminated soil of different degrees of contamination, and the petroleum hydrocarbon removal rate is up to 97%. In addition, compared with the prior art, the processes of fungus sieving, domestication and the like are reduced, and the technical cost is reduced while the processing effect is improved. Moreover, the restoration method is simple in construction technology and low in cost and can be widely applied, and the restored soil has high organic content and high microbial activity and can be used for afforesting.

Description

technical field [0001] The invention relates to a restoration method specially aimed at the soil polluted by oil. Background technique [0002] Petroleum pollution refers to the pollution caused by crude oil and various petroleum products entering the environment during the process of mining, refining, storage, transportation and use. Existing studies have shown that the soil in the oilfield area has been polluted by oil in different degrees, and the oil content in the soil is as high as 23%, which is 500-1000 times higher than the environmental background value. Light components such as alkanes and aromatics in soil petroleum components account for more than 50% of the total, providing a reliable material basis for bioremediation or joint development with other remediation measures. [0003] After oil enters the soil environment, it will change the physical and chemical properties of the soil such as moisture content and organic matter. On the one hand, it will affect the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08C09K17/14
CPCB09C1/00B09C1/08B09C2101/00C09K17/14
Inventor 赵粉红谢爱军高素萍常立
Owner SHANGHAI LICHANG ENVIRONMENTAL ENG
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