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Oxidant and method for remedying organic contaminated soil/underground water

A technology for organic pollution and groundwater, which is applied in the restoration of polluted soil, the treatment of polluted groundwater/leachate, chemical instruments and methods, etc. The effect of good repair effect and wide source

Inactive Publication Date: 2015-04-08
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that existing organic polluted soil / groundwater has complex pollution and the remediation process easily causes secondary pollution, the present invention provides a combined activated oxidant and method for remediating organic polluted soil, which can be used in the remediation of organic polluted soil / groundwater, which can Solve the problem of compound pollution of soil / groundwater, so that the restoration effect is good, and the environmental risk is low after restoration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare 250μg / L cis-1,2-dichloroethylene to simulate polluted groundwater. Sodium persulfate solution was added to the solution at a dose of 5 g / L. Three groups of experiments were set up, using activated sodium persulfate with different activation methods to treat polluted water, namely: ① ferrous ion activated sodium persulfate; ② hydrogen peroxide activated sodium persulfate; ③ ferrous ion + hydrogen peroxide combined activated sodium persulfate . Wherein ferrous sulfate activation group guarantees ferrous ion concentration is 100mg / L; Hydrogen peroxide activation group dosage is 2.5% (volume ratio), and combination activation then adds the ferrous ion of 100mg / L and the hydrogen peroxide of volume ratio 2.5% simultaneously.

[0025] React at room temperature for 48 hours, and ensure that the reaction bottle is in a zero headspace state during the reaction to avoid volatilization of pollutants. When measuring the concentration of cis-1,2-dichloroethylene, use a pur...

Embodiment 2

[0027] Prepare 250μg / L 1,2,3-trichlorobenzene to simulate polluted groundwater. Sodium persulfate solution was added to the solution at a dose of 5 g / L. Three groups of experiments were set up, using activated sodium persulfate with different activation methods to treat polluted water, namely: ① ferrous ion activated sodium persulfate; ② hydrogen peroxide activated sodium persulfate; ③ ferrous ion + hydrogen peroxide combined activated sodium persulfate . Wherein ferrous sulfate activation group guarantees ferrous ion concentration is 100mg / L; Hydrogen peroxide activation group dosage is 2.5% (volume ratio), and combination activation then adds the ferrous ion of 100mg / L and the hydrogen peroxide of volume ratio 2.5% simultaneously.

[0028] React at room temperature for 48 hours, and ensure that the reaction bottle is in a zero headspace state during the reaction to avoid volatilization of pollutants. When measuring the concentration of 1,2,3-dichlorobenzene, use a purge an...

Embodiment 3

[0030] Prepare 250μg / L bromoform to simulate polluted groundwater. Sodium persulfate solution was added to the solution at a dose of 5 g / L. Three groups of experiments were set up, using activated sodium persulfate with different activation methods to treat polluted water, namely: ① ferrous ion activated sodium persulfate; ② hydrogen peroxide activated sodium persulfate; ③ ferrous ion + hydrogen peroxide combined activated sodium persulfate . Wherein ferrous sulfate activation group guarantees ferrous ion concentration is 100mg / L; Hydrogen peroxide activation group dosage is 2.5% (volume ratio), and combination activation then adds the ferrous ion of 100mg / L and the hydrogen peroxide of volume ratio 2.5% simultaneously.

[0031] React at room temperature for 48 hours, and ensure that the reaction bottle is in a zero headspace state during the reaction to avoid volatilization of pollutants. When determining the concentration of bromoform, use a purge and trap autosampler to i...

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Abstract

The invention relates to an oxidant and a method for remedying organic contaminated soil / underground water, belonging to the field of soil environment remediation. The oxidant comprises sodium persulfate, ferrous sulfate and hydrogen peroxide. The remedying method comprises the following steps: measuring the contents of organic contaminations in the contaminated soil / underground water; putting the contaminated soil / underground water in a closed container; adding the ferrous sulfate or a ferrous sulfate complex till the concentration of ferrous ions is 20-200mg / L; adding a sodium persulfate solution till the concentration of sodium persulfate is 5-50g / L; adding hydrogen peroxide containing 30 volume percent of an activator 2 by controlling the addition amount to be 2-20 percent; and adding an appropriate amount of deionzed water, uniformly mixing, and then reacting for 6-48 hours. The ferrous sulfate and the hydrogen peroxide of the oxidant are wide in sources, is low in cost and is easily obtained; compared with sodium persulfate activated singly by the hydrogen peroxide, the consumption amount of the oxidant disclosed by the invention is reduced, and the remediation safety is relatively good; the ferrous sulfate and the hydrogen peroxide are jointly used as the activator, and the oxidation effect of the oxidant disclosed by the invention is better than that of sodium persulfate activated by a single activator, and the application contamination range is relatively wide.

Description

technical field [0001] The invention relates to the field of soil / groundwater pollution control in environmental protection, and more specifically relates to an oxidant for repairing organic polluted soil and a method for repairing organic polluted soil / groundwater. Background technique [0002] With the rapid advancement of my country's urbanization process, various cities generally adopt the strategy of "retreating from two to three" to adjust the industrial structure and urban layout. A large number of pesticide factories and chemical factories are closed or relocated, and a large number of polluted sites around the city It is facing secondary development. Many of these sites involve high-concentration and high-risk organic pollution, which poses a serious threat to the safety of human settlements. It is urgent to restore the soil and groundwater of these polluted sites. The chemical oxidation remediation technology has the characteristics of high efficiency, low cost, an...

Claims

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Application Information

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IPC IPC(8): A62D3/38B09C1/08C02F1/72
CPCA62D3/38B09C1/08C02F1/72C02F2103/06C02F2305/02C02F2305/023
Inventor 祝欣龙涛林玉锁王磊陈樯
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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