Peat absorbent and method thereof for processing soil polluted by spilled oil

A technology of polluted soil and adsorbent, applied in the restoration of polluted soil, chemical instruments and methods, and other chemical processes, etc., can solve the problems of expanding the scope of pollution, increasing soil toxicity, and major environmental risks, and simplifying treatment and management. procedures, improve the efficiency of pollution remediation, and avoid the effect of volatilization and leakage

Active Publication Date: 2010-05-26

PIPECHINA SOUTH CHINA CO

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Problems solved by technology

[0007] 1. This method is only suitable for soil with poor soil permeability. For soil with good permeability, it is easy to cause the migration of pollutants and expand the scope of pollution, and even pollute groundwater;

[0008] 2. In this treatment method, the volatile substances in the oil will cause air pollution, and the slow accumulation of refractory substances will increase the toxicity of the soil (Lu Xiujun et al., Journal of Shenyang Agricultural University, 2003-02, Research on the Restoration Technology of Oil Polluted Soil status and prospects);

[0009] 3. This method needs to maintain soil moisture to improve the bioremediation eff...

Abstract

The invention discloses a peat absorbent and a method thereof for processing soil polluted by spilled oil. The peat absorbent is prepared by mixing meadow peat, sphagnum peat and a nitrogenous fertilizer which are proportioned in a way that: in the total weight of 100, the weight percentage of the meadow peat is 25 to 33, the weight percentage of the sphagnum peat is 20 to 33 and the weight percentage of the nitrogenous fertilizer is 25 to 50. The method for processing the soil polluted by the spilled oil is implemented orderly through the following steps: spraying the absorbent into the polluted soil in a shortest time after the soil is polluted by the spilled oil, wherein the input amount of the absorbent is 0.1 to 0.17 times as great as oil spillage; adding quicklime into the soil polluted by the spilled oil, wherein the input amount of the quicklime is 0.1 to 0.3 times as great as the oil spillage; ploughing up the polluted soil sprayed with the absorbent and added with the quicklime, wherein the depth of ploughing is determined according to the penetration depth of the oil; irrigating the polluted soil in a way that the moisture of the soil reaches 80 to 85 percent; and monitoring the content of petroleum hydrocarbon in the polluted soil until the soil meets environmental standards for reuse.

Application Domain

Other chemical processesContaminated soil reclamation

Technology Topic

Environmental standardPetroleum +12

Examples

Experimental program(1)

Example Embodiment

[0038] Example. This example is an industrial test conducted in a test base. The peat adsorbent used to treat soil contaminated by oil spills is:

[0039] 1. Choose two kinds of peat from Northeast Biyuan Peat Development Co., Ltd.-grass wood peat and sphagnum peat, wash the ash with water, and dry it naturally;

[0040] 2. Then the two kinds of peat after deashing and air drying are dehydrated and dried separately. The drying method is vacuum drying at a temperature of 85°C. Two kinds of dry peat with water content, grass peat and sphagnum peat, are selected, and the water content of grass peat is 20 %, the water content of sphagnum peat is 9%;

[0041] 3. Two peat mixtures of grass wood peat and sphagnum peat, the mixing ratio is 1:0.8;

[0042] 4. Add 0.75 times of urea to the mixture and mix it to prepare the adsorbent.

[0043] The peat adsorbent used to treat oil-spilled soil pollution treatment method is:

[0044] The oil-spill-contaminated soil treated is Northeast Asian clay contaminated by Daqing crude oil, and the contaminated area is about 10m 2; The oil spill volume is about 150kg; the average temperature is: 25℃; the basic physical properties of Daqing crude oil are shown in Table 1;

[0045] Table 1 Basic physical properties of Daqing crude oil

[0046] sample

[0047] Sprinkle peat sorbent and lime to the contaminated soil within 5 hours after the oil spill. The peat adsorbent is 20kg and the lime is 15kg; the contaminated soil is tilled, and the depth of tilling is determined to be 23cm according to the penetration depth monitored on site , Then water the contaminated soil, the soil moisture reaches about 80%, and finally cover the soil contaminated area with a black plastic film with small holes; the diameter of the small holes is: 1cm, the hole spacing is: 2cm; every 5 days during the treatment Samples were taken to monitor the oil content in the soil, and the monitoring results are shown in Table 2.

[0048] Table 2 Total petroleum hydrocarbon residues (TPH) in soil during treatment

[0049]

[0050] The test results of using the present invention to treat Daqing crude oil contaminated soil show that for crude oil with high viscosity, high freezing point, asphalt gum content and extremely high wax content, using the method of the present invention, after 150 days, the oil content in the soil has changed from the initial After 180 days, the oil content in the soil was less than 500 mg/kg, and the crude oil removal rate reached more than 99%. And the processing duration is about 6 months, and the processing material cost is less than 30 yuan/m 2.

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Peat absorbent and method thereof for processing soil polluted by spilled oil

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

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Description & Claims & Application Information

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