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Method for iron regulation and passivation of crude oil in som directional oxidation soil and passivation 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 increased costs, consumption of free radicals, low oxidation of petroleum hydrocarbons, etc., and achieve directional oxidation improvement , the effect of good application potential

Active Publication Date: 2021-10-01
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 iron regulation and passivation of crude oil in som directional oxidation soil and passivation soil
  • Method for iron regulation and passivation of crude oil in som directional oxidation soil and passivation soil
  • Method for iron regulation and passivation of crude oil in som directional oxidation soil and passivation 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 oil-containing 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, control the pH to 7, and rotate at 130r / min at room temperature Shake and react for 24 hours, filter and centrifuge, and freeze-dry the filtrate at -50°C to obtain passivated oil-bearing soil.

[0053] 2) Mix the passivated oily soil obtained in step 1) with the oxidant and water according to the mass ratio of 50:0.4:60, place it on an oscillator for continuous oscillation to carry out the directional oxidation reaction, and react for 36 hours at room temperature to complete the passivation controlled by iron Process of SOM directed oxidation of crude oil in soil.

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

Embodiment 2

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

[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. Shake and react for 36 hours at a rotational speed of 135r / min, filter and centrifuge, and freeze-dry the filtrate at -50°C to obtain passivated SOM oily soil.

[0059] 2) Mix the passivated SOM oil-containing soil obtained in step 1) with the oxidant and water according to the mass ratio of 60:0.5:80, place it on an oscillator for continuous oscillation oxidation reaction, and react for 24 hours at room temperature to complete the iron-regulated passivation SOM Process of directed oxidation of crude oil in soil.

[0060] After the reaction, the amount of directional oxidation of petroleum...

Embodiment 3

[0062] The ferrous 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 the oil-containing soil, the molar concentration of 8.7mmol / L ferric sulfate, the molar concentration of 100mmol / L sodium hydroxide passivator and water 50:0.3:0.5:70, control the pH to 7, and rotate at room temperature Shake and react at 140r / min for 48h, filter and centrifuge, and freeze-dry the filtrate at -50°C to obtain passivated SOM oily soil.

[0065] 2) Mix the passivated SOM oily soil obtained in step 1) with the oxidant and water according to the mass ratio of 40:0.4:100, place it on an oscillator for continuous oscillating directional oxidation reaction, and react for 48 hours at room temperature to complete the iron-regulated passivation Process of SOM directed oxidation of crude oil in soil.

[0066] After the reaction, the amount of directional oxidati...

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Abstract

The invention discloses a method for controlling and passivating crude oil in SOM directional oxidation soil by iron and passivating the soil, which comprises the following steps of passivating the organic matter in the oil-bearing soil: uniformly mixing the oil-containing soil, ferrous salt, passivating agent and water, shaking Passivation to obtain passivated SOM oil-bearing soil; mix the passivated SOM oil-containing soil with oxidant and water, and continuously oscillate the oxidation reaction to complete the process of directional oxidation of crude oil in the soil by iron-regulated passivation SOM. The present invention regulates and passivates SOM directional oxidation in soil through iron regulation and control to consume free radicals of protein I, free radicals of protein II and functional group C=O; the directional oxidation is as high as 3100 mg / kg. Improve the efficiency of direct oxidation of crude oil by OH.

Description

technical field [0001] The invention belongs to the field of in-situ chemical oxidation soil restoration, and relates to a method for directional oxidation of crude oil in soil by iron passivation soil organic matter (SOM) and passivation SOM oily soil. Background technique [0002] For China's oil-producing areas, the pollution caused by oil is becoming more and more serious. The Fenton oxidation method is through the Fe 2+ and hydrogen peroxide (H 2 o 2 ) reaction can generate hydroxyl radicals (·OH) with a very high standard electrode potential (2.80V) to oxidize and remove pollutants. Due to the strong oxidation of OH, there is no selectivity for 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(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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