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Method for directionally oxidizing crude oil in soil by passivating SOM through iron regulation and control and passivated soil

A technology for iron regulation and soil application in the direction of chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., can solve the problems of increasing costs, consuming free radicals, and SOM consumes a large amount of hydroxyl radicals, etc., to achieve directional oxidation Improvement, effect of good application potential

Active Publication Date: 2020-10-30
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that after increasing the concentration of iron catalyst, the oxidation amount of petroleum hydrocarbons increased by 1.8 times, but the oxidation amount of SOM increased by 2.8 times. Oxidation of petroleum hydrocarbons also increases additional costs and reduces economic benefits
These research results all show that after Fenton oxidation, SOM consumes a large amount of free radicals, resulting in lower oxidation of petroleum hydrocarbons
Visible, existing method can not fundamentally solve the problem that SOM consumes a large amount of hydroxyl free radicals

Method used

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  • Method for directionally oxidizing crude oil in soil by passivating SOM through iron regulation and control and passivated soil
  • Method for directionally oxidizing crude oil in soil by passivating SOM through iron regulation and control and passivated soil
  • Method for directionally oxidizing crude oil in soil by passivating SOM through iron regulation and control and passivated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1) Passivation of organic matter in oily soil

[0052] According to the mass ratio, mix the oily soil, the concentration of 2.9mmol / L ferric sulfate, the concentration of 50mmol / L hydrogen peroxide passivator and water 60:0.2:1.0:50 uniformly, control the pH to 7, and rotate at 130r / min at room temperature The reaction was shaken for 24 hours, filtered, centrifuged, and the filtrate was freeze-dried at -50°C to obtain passivated oily soil.

[0053] 2) The passivated oily soil obtained in step 1) is mixed with oxidant and water in a mass ratio of 50:0.4:60, and placed on an oscillator to continuously oscillate for directional oxidation reaction. Under normal temperature conditions, the reaction is 36h to complete the iron-regulated passivation. The process of directional oxidation of crude oil in soil by SOM.

[0054] After the reaction, the directional oxidation amount of petroleum hydrocarbon is as high as 650mg / kg, the functional group carbonyl in SOM is passivated, and the...

Embodiment 2

[0056] The divalent iron salt used is 5.8mmol / L ferrous chloride, and the passivating agent is 5mmol / L sodium hydroxide.

[0057] 1) Passivation of organic matter in oily soil

[0058] According to the mass ratio, mix oily soil, ferrous chloride with a concentration of 5.8mmol / L, sodium hydroxide passivator with a concentration of 25mmol / L and water 70:0.1:0.6:55, and control the pH to 7 at room temperature. The reaction was shaken at 135r / min for 36h, filtered, centrifuged, and the filtrate was freeze-dried at -50°C to obtain passivated SOM oily soil.

[0059] 2) Mix the oily soil with the passivated SOM obtained in step 1) with the oxidant and water in a mass ratio of 60:0.5:80, and place it on an oscillator to continuously oscillate the oxidation reaction, and react for 24 hours under normal temperature conditions to complete the iron-regulated passivation SOM The process of directional oxidation of crude oil in the soil.

[0060] After the reaction, the directional oxidation amou...

Embodiment 3

[0062] The divalent iron salt used is 8.7mmol / L ferric sulfate, and the passivating agent is 100mmol / L sodium hydroxide.

[0063] 1) Passivation of organic matter in oily soil

[0064] According to the mass ratio, mix oily soil, molar concentration of 8.7mmol / L ferric sulfate, molar concentration of 100mmol / L sodium hydroxide passivator and water 50:0.3:0.5:70 uniformly, control pH to 7, and rotate speed at room temperature The reaction was shaken at 140r / min for 48h, filtered, centrifuged, and the filtrate was freeze-dried at -50°C to obtain passivated SOM oily soil.

[0065] 2) The passivated SOM oily soil obtained in step 1) is mixed with oxidant and water in a mass ratio of 40:0.4:100, and placed on a shaker to continuously oscillate the directional oxidation reaction, and react for 48 hours at room temperature to complete the iron-regulated passivation The process of directional oxidation of crude oil in soil by SOM.

[0066] After the reaction, the directional oxidation amount ...

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Abstract

The invention discloses a method for directionally oxidizing crude oil in soil by passivating SOM through iron regulation and control and passivated soil, wherein the method comprises the following steps: passivating organic matters in oil-containing soil: uniformly mixing the oil-containing soil, ferrous salt, a passivating agent and water, and carrying out oscillation passivation to obtain the passivated SOM oil-containing soil; and mixing the passivated SOM oil-containing soil with an oxidant and water, and carrying out continuous oscillation oxidation reaction to finish the process of directionally oxidizing the crude oil in the soil by passivating the SOM through iron regulation and control. According to the method, the consumption of free radicals of protein I, the consumption of free radicals of protein II and the consumption of functional groups C=O in the directionally oxidized soil are reduced by passivating the SOM through iron regulation and control; the directional oxidation amount is as high as 3100 mg / kg. The efficiency of directly oxidized crude oil by .OH is improved.

Description

Technical field [0001] The invention belongs to the field of in-situ chemical oxidation soil remediation, and relates to a method for directional oxidation of crude oil in soil by iron passivation of soil organic matter (SOM) and passivation of SOM oily soil. Background technique [0002] For China's oil-producing areas, pollution caused by oil is getting more and more serious. Fenton oxidation method is through Fe 2+ And hydrogen peroxide (H 2 O 2 The reaction can generate hydroxyl radicals (·OH) with a high standard electrode potential (2.80V) to oxidize and remove pollutants. Due to the strong oxidizing property of ·OH, there is no selectivity in the oxidation and removal of pollutants, and it can effectively degrade a variety of organic pollutants. Therefore, Fenton oxidation has become one of the most commonly used in-situ chemical oxidation (ISCO) repair techniques. [0003] However, the oxidation of pollutants by hydroxyl radicals during Fenton oxidation is not selective. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/02
CPCB09C1/08B09C2101/00C09K17/02
Inventor 王新怡贺维鹏
Owner HUNAN UNIV
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