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In-in-situ remediating method for oil-contaminated soil

A technology of oil pollution and remediation method, which is applied in the field of in-situ remediation of oil-contaminated soil, which can solve the problems of poor degradation effect of high-concentration oil-contaminated soil, restrictions on large-scale application of bioremediation, high cost of bacterial agents, etc., and achieve soil ecotoxicity Decrease, good repair effect, effect of reducing repair cost

Inactive Publication Date: 2017-12-01
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, bioremediation of petroleum-contaminated soil still has disadvantages such as long on-site remediation period, poor degradation effect on high-concentration petroleum-contaminated soil, and high cost of bacterial agents, which limit the large-scale application of bioremediation.

Method used

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  • In-in-situ remediating method for oil-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mineralized waste with a landfill age of 8 years was collected in the sanitary landfill of domestic waste, passed through a sieve with an aperture of 10 mm, and mineralized waste with a particle size of less than 10 mm was obtained for use.

[0029] Add the above sieved mineralized waste into the oil-contaminated soil (with a petroleum hydrocarbon content of 50g / kg) in situ according to the mass ratio of the mineralized waste to the oil-contaminated soil at a ratio of 1:1, and stir evenly. Contaminated soil without mineralized waste was used as a control. Table 1 shows the changes in the physical, chemical and biological properties of the contaminated soil before and after adding mineralized waste.

[0030] Table 1 Changes of soil physical, chemical and biological properties before and after adding mineralized waste

[0031]

[0032] From the data in Table 1, it can be seen that after adding mineralized waste, the ecotoxicity of the soil was greatly reduced, and the...

Embodiment 2

[0037] Mineralized waste with a landfill age of 13 years was collected in the sanitary landfill of domestic waste, passed through a sieve with an aperture of 10 mm, and mineralized waste with a particle size of less than 10 mm was obtained for use.

[0038] Add the above sieved mineralized waste into the oil-contaminated soil (with a petroleum hydrocarbon content of 50g / kg) in situ according to the mass ratio of the mineralized waste to the oil-contaminated soil at a ratio of 1:1, and stir evenly. Contaminated soil without mineralized waste was used as a control.

[0039] After the mineralized garbage is mixed with the petroleum-contaminated soil, a mixed soil is obtained, and the petroleum hydrocarbons in the mixed soil are gradually degraded. The temperature of the mixed soil is controlled at 25°C, and water is added regularly to maintain a moisture content of 15wt% of the mixed soil. Plowing is performed every 4 days.

[0040] After 42 days of degradation, the degradation r...

Embodiment 3

[0047] Mineralized waste with a landfill age of 8 years was collected in the sanitary landfill of domestic waste, passed through a sieve with an aperture of 10 mm, and mineralized waste with a particle size of less than 10 mm was obtained for use.

[0048] In the oil-contaminated soil with petroleum hydrocarbon content of 30g / kg, 50g / kg, 100g / kg, 200g / kg, and 300g / kg, add the above-mentioned sieved oil according to the mass ratio of mineralized waste to petroleum-contaminated soil at a ratio of 1:1. Mineralize the litter and mix well. Contaminated soil without mineralized waste was used as a control.

[0049] After the mineralized garbage is mixed with the petroleum-contaminated soil, a mixed soil is obtained, and the petroleum hydrocarbons in the mixed soil are gradually degraded. The temperature of the mixed soil is controlled at 25°C, and water is added regularly to maintain a moisture content of 15wt% of the mixed soil. Plowing is performed every 4 days.

[0050] After 70...

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Abstract

The invention belongs to the field of soil remediation, and particularly relates to an in-situ remediating method for oil-contaminated soil. The in-situ remediating method for the oil-contaminated soil comprises the following steps that (a) mineralized rubbish is screened and then mixed with the oil-contaminated soil in in-situ to obtain mixed soil; after petroleum hydrocarbon in the mixed soil is degraded, remediated soil is obtained; the screening mesh size is 10-20mm; and the landfill age of the mineralized rubbish is 5-15 years. According to the in-situ remediating method for the oil-contaminated soil, the mineralized rubbish with the specific particle size and the landfill age is taken as the soil remediating agent to degrade petroleum hydrocarbon in the oil-contaminated soil, and the good remediating effect on the oil-contaminated soil is achieved. The experimental results show that under the same conditions of remediation, the degrading effect and the degrading speed of the petroleum hydrocarbon in soil with mineralized rubbish added are significantly higher than those of soil without the mineralized rubbish, the ecological toxicity of the soil is greatly reduced, and the activity of petroleum hydrocarbon degrading enzymes, the quantity and diversity of petroleum hydrocarbon degrading bacteria, and the quality and fertility of the soil are increased significantly.

Description

technical field [0001] The invention belongs to the field of soil remediation, in particular to an in-situ remediation method for oil-contaminated soil. Background technique [0002] With the rapid development of today's society and economy, the demand for oil is gradually increasing, which in turn promotes the development of the oil extraction industry. However, due to management and technical defects, a large amount of crude oil directly or indirectly flows into the soil, causing extensive soil pollution. The world consumes about 8 million tons of petroleum products every year, and at the same time produces 600,000 tons of petroleum pollutants, and the soil is its main receptor. As of 2007, the area of ​​petroleum-contaminated soil in my country has reached 5 million square kilometers 2 . Petroleum pollutants not only cause soil salinization, poisoning, soil damage and waste, but also its toxic substances can enter the food chain system through crops and groundwater, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/00
Inventor 刘庆梅李启彬刘丹昝丽常乐苟雪梅王佩瑾
Owner SOUTHWEST JIAOTONG UNIV
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