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Method for remedying heavily oil-contaminated soil

A technology for oil pollution and soil, applied in the field of contaminated soil treatment, can solve the problems of affecting the growth of crops, the limitation of microbial or phytoremediation ability, and high cost, and achieve the effect of economical and environmental restoration, permanent elimination of pollutants, and low cost

Active Publication Date: 2018-10-16
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Affect the permeability of the soil, reduce the soil quality, oil stains adhere to the plant root system, form a layer of mucous film, hinder the absorption of nutrients and water by the plant root system, cause the root system to rot, and affect the growth of crops. Repair, the dissolved gas in the oil-contaminated soil exposed to the open air will volatilize into the atmosphere, causing air pollution, and the oil-contaminated soil can flow into the water with rainwater to cause water pollution
In the existing technology, the above-mentioned oil-contaminated soil remediation technologies include physical remediation, chemical remediation and biological remediation. Physical remediation and chemical remediation will cause secondary pollution, change soil structure and high cost in the process of remediating oil-contaminated soil. With certain limitations, bioremediation has become a research hotspot in recent years. Due to the high oil content and high toxicity of heavily oil-contaminated soil, the remediation ability of microorganisms or plants is limited. When the soil is heavily polluted, it is difficult for microorganisms in the soil to survive. , the bioremediation method is difficult to effectively implement, so the present invention proposes a combined remediation method based on biotechnology to effectively remediate heavily oil-contaminated soil

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] A kind of method for remediating heavily oil-contaminated soil provided by the invention comprises: S1, spreading surfactant sodium lauryl sulfate to the plot of heavy oil pollution, the spreading rate of sodium lauryl sulfate is 65g / m 2 Soil, after standing for 2 days, remove and accumulate the surface soil of the plot with an oil content greater than 20wt%, add chicken manure, corn stalks, bentonite, urea and the first petroleum degrading bacteria to ferment, and obtain the fermentation product after 100 days of fermentation; the first petroleum degrading bacteria Bacillus subtilis and white rot fungus were prepared at a ratio of 1:1 to make 8×10 10 The compound bacterial strain of each / ml; the ratio of parts by weight of surface soil, chicken manure, corn stalks, bentonite, and urea is 9:6:6:3:1, and the addition amount of the first petroleum-degrading bacteria is 3ml / m 3 soil;

[0016] S2, plowing 32cm of the plot after the topsoil is removed, and evenly sprinkli...

Embodiment 2

[0019] A kind of method for remediating heavily oil-contaminated soil provided by the invention comprises: S1, spreading surfactant sodium lauryl sulfate to the plot of heavy oil pollution, the spreading rate of sodium lauryl sulfate is 90g / m 2 Soil, after standing still for 3 days, remove and accumulate the surface soil of the plot, with an oil content greater than 20wt%, add cow dung, wheat straw, bentonite, urea and the first petroleum degrading bacteria to ferment, and obtain the fermentation product after 86 days of fermentation; the first petroleum The degrading bacteria are Bacillus subtilis and white rot fungi according to the ratio of 1:1 to make 8×10 10 pcs / ml composite bacteria; the ratio of surface soil, cow dung, wheat straw, bentonite, and urea by weight is 9:6:6:3:1, and the amount of the first oil-degrading bacteria is 3ml / m 3 soil;

[0020] S2, plow 30cm in the plot after the surface soil is removed, and evenly sprinkle water to make the soil humidity reach...

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PUM

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Abstract

The invention discloses a method for remedying heavily oil-contaminated soil, and belongs to the technical field of polluted soil treatment. The method comprises the steps that 1, a surfactant is spread to a heavily oil-contaminated land parcel, the surface layer soil on the land parcel is shoveled away and stacked, animal excrement, crop straw, bentonite, urea and first oil decomposing bacteria are added for fermentation; 2, the land parcel with the surface layer soil shoveled away is turned over for 25-40 cm, water is evenly spread to reach the soil humidity being 50-65%, the pH of soil is adjusted to 7-10, second oil decomposing bacteria is added to the turned-over land parcel, alfalfa is planted on the turned-over land parcel, and the 2-3 crops of alfalfa are harvested and added into afermentation heap in the step 1 for fermentation; and 3, fermentation products in the step 1 are granulated in a granulation machine to form organic fertilizer to be spread to the alfalfa planting area. A bioremediation and phytoremediation cyclic degradation mode is formed, and the method is economical, environmentally friendly and good in remedying effect.

Description

technical field [0001] The invention relates to the technical field of contaminated soil treatment, in particular to a method for repairing heavily oil-contaminated soil. Background technique [0002] With the rapid development of the petroleum industry, pollution and omission accidents in the process of petroleum exploration, smelting and transportation, as well as the discharge of oily wastewater have caused soil pollution problems. After petroleum enters the soil, it will destroy the soil structure. Affect the permeability of the soil, reduce the soil quality, oil stains adhere to the plant root system, form a layer of mucous film, hinder the absorption of nutrients and water by the plant root system, cause the root system to rot, and affect the growth of crops. Remediation, the dissolved gas in the oil-contaminated soil exposed to the open air will volatilize into the atmosphere, causing air pollution, and the oil-contaminated soil can flow into the water area with rainw...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
CPCB09C1/10B09C1/105B09C2101/00
Inventor 魏小娜王斌沈钰馨李法云范志平
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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