Chemical repairing method for organic pollution soil

A technology for polluted soil and chemical remediation, applied in the field of soil remediation, can solve the problems of inability to react with organic pollutants, inability to remove organic pollutants, and fast decomposition rate of hydrogen peroxide, and to overcome the problems of poor sustainability and non-toxicity. The effect of secondary pollution and rapid degradation

Inactive Publication Date: 2016-06-29
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium persulfate is very stable at 25°C and is easily decomposed by catalysis to generate sulfuric acid free radicals. It has good mobility in soil and hardly reacts with natural organic matter; but when used alone, it is too stable to react with organic pollutants. Therefore, the purpose of removing organic pollutants cannot be achieved; while the commonly used oxidant hydrogen peroxide decomposes too fast, the effective distance is short, the utilization efficiency is low, and the organic matter cannot be completely mineralized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Treatment of organic matter-contaminated soil

[0024] Get 5.0g of p-chloronitrobenzene contaminated soil, wherein the concentration of p-chloronitrobenzene is 0.4mg / g, add potassium persulfate solution to make the concentration 0.06mmol / g, stir at room temperature; add hydrogen peroxide solution , to make the concentration 0.012mmol / g, stir at room temperature, and take samples for analysis at intervals of 1 hour. Simultaneously, get two parts of p-chloronitrobenzene contaminated soil 5.0g, only add potassium persulfate solution and hydrogen peroxide solution respectively, make its concentration be respectively 0.06mmol / g and 0.012mmol / g, stir under room temperature, interval 1 hourly sampling analysis.

[0025] (2) Analysis and determination of soil samples

[0026] Weigh 0.09g p-chloronitrobenzene-contaminated soil sample into a 7mL centrifuge tube, add 2mL methanol, ultrasonically extract for 20min, put the centrifuge tube into a centrifuge at 6000r / min for 3m...

Embodiment 2

[0029] (1) Treatment of organic matter-contaminated soil

[0030] Take 5.0g of p-chloronitrobenzene contaminated soil, wherein the concentration of p-chloronitrobenzene is 0.4mg / g, add sodium persulfate solution to make the concentration 0.01mmol / g, stir at room temperature; add hydrogen peroxide solution , to make the concentration 0.012mmol / g, stir at room temperature, and take samples for analysis at intervals of 1 hour. Simultaneously, get two parts of p-chloronitrobenzene contaminated soil 5.0g, only add sodium persulfate solution and hydrogen peroxide solution respectively, make its concentration be respectively 0.01mmol / g and 0.012mmol / g, stir under room temperature, interval 1 hourly sampling analysis.

[0031] (2) Analysis and determination of soil samples

[0032] With embodiment 1.

[0033] Na was added to p-chloronitrobenzene-contaminated soil 2 S 2 o 8 / H 2 o 2 、Na 2 S 2 o 8 and H 2 o 2 , the degradation rates of o-chloronitrobenzene were 48.1%, 20.3%...

Embodiment 3

[0035] (1) Treatment of organic matter-contaminated soil

[0036]Get 5.0g of p-chloronitrobenzene contaminated soil, wherein the concentration of p-chloronitrobenzene is 0.4mg / g, add ammonium persulfate solution to make the concentration 1.5mmol / g, stir at room temperature; add hydrogen peroxide solution , to make the concentration 0.002mmol / g, stir at room temperature, and take samples for analysis at intervals of 1 hour. Simultaneously, get two parts of p-chloronitrobenzene contaminated soil 5.0g, only add ammonium persulfate solution and hydrogen peroxide solution respectively, make its concentration be respectively 1.5mmol / g and 0.002mmol / g, stir under room temperature, interval 1 hourly sampling analysis.

[0037] (2) Analysis and determination of soil samples

[0038] With embodiment 1.

[0039] Adding (NH 4 ) 2 S 2 o 8 / H 2 o 2 , (NH 4 ) 2 S 2 o 8 and H 2 o 2 , the degradation rates of o-chloronitrobenzene were 88.6%, 84.7% and 2.4%, respectively.

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PUM

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Abstract

The invention discloses a chemical repairing method for organic pollution soil. According to the method, persulfate / hydrogen peroxide dual oxidants are added into the organic pollution soil according to the proportion, inherent iron oxide in the soil serves as a catalyst, and organic pollutants in the soil are oxidized and degraded. The method has the beneficial effects that equipment is simple, operation is convenient, cost is low, selectivity is avoided, the organic pollutant removing efficiency is high, and environment friendliness is achieved; and the method is especially suitable for repairing the organic pollution soil which is seriously polluted and is hard to degrade biologically.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a chemical remediation method for organic-contaminated soil, in particular to a method for remediating organic-contaminated soil by using a potassium persulfate / hydrogen peroxide double oxidant system. Background technique [0002] Soil is located in the center of the natural environment. It is the material basis for human survival and the central link connecting the inorganic and organic, biological and non-biological realms in the natural environment. With the development of production, more and more organic pollutants such as petroleum, benzene series, pesticides, polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) produced in the chemical industry and petroleum industry have passed through various way into the soil. Once soil is polluted, it will not only directly affect crops, but also threaten groundwater quality and affect hum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 刘中华国伟林乔壮明卫静周海红张科韩雪梅
Owner UNIV OF JINAN
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