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Method for restoring soil contaminated by persistent organic pollutants through elution with electrolyzed oxidizing water

A technology for oxidizing potential water and polluted soil, applied in the restoration of polluted soil, etc., can solve the problems of weak oxidation ability, low cost of hydrogen peroxide, and expensive cost of ozone

Active Publication Date: 2019-08-20
ANHUI UNIVERSITY OF ARCHITECTURE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the chemical oxidation methods, ozone has a strong oxidizing ability and has no secondary pollution problem. It is suitable as a repair agent for soil chemical oxidation, but the cost of ozone is expensive; the cost of hydrogen peroxide is relatively low, but the oxidizing ability is weak
The cost of biological treatment is low, but for the refractory POPs organic matter, the traditional biological treatment technology is relatively difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Take a certain length of pipe, seal both ends with plastic plates, open a number of small holes evenly on the surface of the lower end, with a diameter of 2-3mm, fix it with a steel bracket and place it vertically on the upper part of the water tank, and weld it together with the water tank as a whole. Ventilation holes are left on the side surfaces of the upper and lower ends of the pipeline close to the bottom, which are respectively upper ventilation holes and lower ventilation holes. The upper and lower side surfaces of the pipeline are also provided with larger diameter holes, which are respectively upper The soil inlet hole and the lower soil discharge hole, the soil is added from the upper soil inlet hole and discharged from the lower soil discharge hole. The reaction device is respectively set up in two groups, which are group A and group B.

[0047] There are several water tanks, which are raw water tanks, that is, NaCl solution tanks; alkaline water outlet tank...

Embodiment 2

[0060] Take out the soil from the polluted site, crush it into 0.1mm particle size, and detect the concentration of pollutants at the same time.

[0061] Add the above-mentioned soil particles into the above-mentioned leaching reaction device through the soil inlet hole, and fill it up.

[0062] Configure dilute sodium chloride solution in the raw water tank (the raw water tank is used intermittently, that is, the two water tanks are used alternately), and the mass concentration of the dilute sodium chloride solution is 0.05g / L, as the source water tank of the oxidation potential water generator.

[0063] Prepare a mixed solution with a concentration of 0.5g / L sodium dodecylbenzenesulfonate (SDBS) and a concentration of 0.4g / L sodium dodecyl sulfate (SDS), transport it to the alkaline water tank with a micropump, and mix well Eluent A is formed. Use a water pump to pump the eluent A into the reaction device in a spray state. The two reaction devices A and B operate in turn. T...

Embodiment 3

[0070] Take out the soil from the polluted site, crush it into 1mm particle size, and detect the concentration of pollutants at the same time.

[0071] Add the above-mentioned soil particles into the above-mentioned leaching reaction device through the soil inlet hole, and fill it up.

[0072] Configure dilute sodium chloride solution in the raw water tank (the raw water tank is used intermittently, that is, the two water tanks are used alternately), and the mass concentration of the dilute sodium chloride solution is 0.07g / L, which is used as the source water tank of the oxidation potential water generator.

[0073] Prepare a mixed solution with a concentration of 0.7g / L sodium dodecylbenzenesulfonate (SDBS) and a concentration of 0.8g / L sodium dodecyl sulfate (SDS), transport it to the alkaline water tank with a micropump, and mix well Eluent A is formed. Use a water pump to pump the eluent A into the reaction device in a spray state. The two reaction devices A and B operat...

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Abstract

The invention relates to a method for restoring soil contaminated by persistent organic pollutants through elution with electrolyzed oxidizing water. according to the invention, corresponding reagentsare respectively added into effluents output from two poles of a generator for electrolyzed oxidizing water so as to prepare three eluents; a mixed solution of sodium lauryl sulfate and sodium dodecyl benzene sulfate is added into alkaline water at the negative pole to prepare an eluent A; FeCl3 is added into a part of acidic water at the positive pole to prepare an eluent B, and H2O2 is added into the other part of the acidic water at the positive pole to prepare an eluent C. The soil is eluted according to a sequence of elution with the eluent A, rinsing, elution with the eluent B, rinsing,elution with the eluent C and rinsing. The method of the invention is relatively simple; waste liquid obtained after elution can be completely neutralized, so treatment is easy and operation is safeand reliable; and the method has the advantages of easy operation and maintenance, low material cost and low energy consumption for operation, and is applicable to restoration of soil in industrial contaminated sites and with low organic matter pollution concentrations. The method has good restoration effect on soil contaminated by various organic substances including persistent organic pollutants, and is a simple and effective remediation technology for organic contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of soil remediation methods, and in particular relates to an oxidation potential water leaching repair method for persistent organic matter polluted soil. Background technique [0002] Industrial enterprises, especially petrochemical and coal chemical industries, produce a large amount of organic pollutants such as polycyclic aromatic hydrocarbons and benzene series. During the production process, it is inevitable due to leakage, storage, transportation, accidents, or even illicit discharge. Significant amounts of organic matter enter the environment and become lodged in the soil of industrial sites. After the relocation or shutdown of these enterprises, the problem of organic pollution left over from the site is very prominent. According to research, among the pollutants in industrial sites, some organic compounds with complex structures are very stable and difficult to degrade in the environment, which ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08B09C2101/00
Inventor 唐玉朝薛莉娉李卫华伍昌年黄显怀黄明孟平李伟平夏晓武谢荣焕
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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