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Selective degradation method for petroleum pollutants in soil rich in organic matters

A selective, PetroChina technology, applied in the field of oil pollution remediation, can solve problems such as limited application, waste of chemicals, serious remediation of soil rich in organic matter, etc., and achieve the effect of improving removal rate, reducing oxidation, improving stability and utilization rate

Active Publication Date: 2015-09-09
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that after the existing modified Fenton oxidizes the polluted soil, about 80%-30% of the SOM is removed. The oxidation of so much SOM not only causes waste of chemicals, but also destroys the soil environment, which limits the application of this technology in practical engineering. , especially for the remediation of soils rich in organic matter

Method used

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  • Selective degradation method for petroleum pollutants in soil rich in organic matters
  • Selective degradation method for petroleum pollutants in soil rich in organic matters
  • Selective degradation method for petroleum pollutants in soil rich in organic matters

Examples

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Effect test

Embodiment 1

[0050] This embodiment provides a kind of selective degradation method of petroleum pollutants in soil rich in organic matter, comprising the following steps:

[0051] Step 1, citric acid-FeSO 4 Solution preparation:

[0052] Weigh ferrous sulfate (FeSO 4 ·7H 2 O), citric acid (C 6 h 8 o 7 ), anhydrous calcium chloride (CaCl 2 ), after adding water to dissolve, adjust the pH value to 9.0 with 5M NaOH to prepare a series of solutions;

[0053] The mass ratio of citric acid to calcium chloride anhydrous is 17.4:1.11;

[0054] Control the concentration of ferrous sulfate to 5.8mM, prepare a series of citric acid concentrations, so that the citric acid concentrations are 10mM, 13mM, 14mM, 15mM, 16mM, 20mM;

[0055] Step 2, carry out Fenton oxidation:

[0056] In the 100mL reaction bottle, first add 5g soil sample (S1 and S2 parallel test) and the concentration ratio of citric acid-FeSO4 in a series of steps one 4 solution, and then add a concentration of 900mM H 2 o 2 ...

Embodiment 2

[0062] This embodiment provides a kind of selective degradation method of petroleum pollutants in soil rich in organic matter, comprising the following steps:

[0063] Step 1, citric acid-FeSO 4 Solution preparation:

[0064] Weigh ferrous sulfate (FeSO 4 ·7H 2 O), citric acid (C 6 h 8 o 7 ), anhydrous calcium chloride (CaCl 2 ), after adding water to dissolve, adjust the pH value to 9.0 with 5M NaOH to prepare a series of solutions;

[0065] The mass ratio of citric acid to calcium chloride anhydrous is 17.4:1.11;

[0066] Control the concentration of ferrous sulfate to be 5.8mM, and control the concentration of citric acid to be 15mM respectively;

[0067] Step 2, carry out Fenton oxidation:

[0068] In the 100mL reaction flask, add 5g soil sample (S1 and S2 parallel test) and the citric acid-FeSO4 concentration ratio in step 1 4 solution, and then add a series of concentrations of H 2 o 2 , H 2 o 2 Concentrations were 300mM, 500mM, 700mM, 900mM, 1100mM, 1300mM...

Embodiment 3

[0080] This embodiment provides a kind of selective degradation method of petroleum pollutants in soil rich in organic matter, comprising the following steps:

[0081] Step 1, citric acid-FeSO 4 Solution preparation:

[0082] Weigh ferrous sulfate (FeSO 4 ·7H 2 O), citric acid (C 6 h 8 o 7 ), anhydrous calcium chloride (CaCl 2 ), after adding water to dissolve, adjust the pH value to 9.0 with 5M NaOH to prepare a series of solutions;

[0083] The mass ratio of citric acid to calcium chloride anhydrous is 17.4:1.11;

[0084] Control the concentration of ferrous sulfate to be 5.8mM, and control the concentration of citric acid to be 15mM respectively;

[0085] Step 2, carry out Fenton oxidation:

[0086] In the 100mL reaction flask, add 5g soil sample (S1 and S2 parallel test) and the citric acid-FeSO4 concentration ratio in step 1 4 solution, and then add a series of concentrations of H 2 o 2 , H 2 o 2 The concentration is 900mM, making FeSO 4 with H 2 o 2 The ...

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Abstract

The invention provides a selective degradation method for petroleum pollutants in soil rich in organic matters. According to the selective degradation method, a Fenton reagent consisting of hydrogen peroxide and Fe<2+> is taken as an oxidization reagent; and a complex solution of citric acid and calcium chloride is added into a Fe<2+> solution in the Fenton reagent and used as a selective regulator to improve selective oxidative degradation of the Fenton reagent to the petroleum pollutants. TPH (total petroleum hydrocarbons) are selectively degraded by the Fenton reagent, so that the TPH removal rate is increased, the oxidization of SOM (soil organic matter) is reduced, the stability and the utilization rate of hydrogen peroxide in a Fenton system can be improved, and the service life of a hydroxyl radical is prolonged.

Description

technical field [0001] The invention belongs to the field of oil pollution restoration, and relates to the restoration of oil pollutants in soil rich in organic matter, in particular to a selective degradation method for oil pollutants in soil rich in organic matter. Background technique [0002] According to incomplete statistics, nearly 600,000 tons of oil enters the environment every year in my country, and the area of ​​oil-contaminated soil is about 75,000 mu (calculated as 50m2 per oil well pollution area), and the intensity of oil pollution is as high as 50-450g / kg. These oil-contaminated soils have the characteristics of high oil concentration, difficult restoration, long residual time, and easy migration into groundwater, causing extremely serious harm to water bodies and the ecological environment, and bringing serious negative effects to the ecology, crops, and human health in polluted areas. influences. At present, among various methods for treating oil-contamin...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 徐金兰王威张海涵文刚邓鑫杨玲引
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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