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Method for repairing and treating phthalate-polluted soil through hydrogen peroxide produced through pulse electrochemistry

A technology for electrochemically producing hydrogen peroxide and phthalates, which is applied in the field of soil remediation and can solve the problems of unsatisfactory effect, limited water content and gas permeability, etc.

Active Publication Date: 2021-06-01
CHONGQING RES ACAD OF ECO ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, soil is a solid with clay minerals as the main component, and its water content and gas permeability are limited. Therefore, the traditional electro-Fenton technology is not effective in dealing with organic matter-contaminated soil.

Method used

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  • Method for repairing and treating phthalate-polluted soil through hydrogen peroxide produced through pulse electrochemistry
  • Method for repairing and treating phthalate-polluted soil through hydrogen peroxide produced through pulse electrochemistry
  • Method for repairing and treating phthalate-polluted soil through hydrogen peroxide produced through pulse electrochemistry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1.5L of 0.5M NaHCO 3 Add 20kg of the water solution to the crushed paddy field soil polluted by di-n-butyl phthalate in a certain place in Chongqing, mix well and insert two sizes of 30 (length) cm×15 (width) cm×1 (thickness) A graphite plate of cm was used as an electrode, and the distance between the two electrodes was 30 cm. Then, a square wave pulse voltage of ±6.0 V was applied to the two electrodes with a pulse width of 20 s, and the electrochemical repair was performed for 4 h.

[0028] The rice farmland soil after the above treatment was washed with water, the eluent was collected, filtered and then analyzed by liquid chromatography, and the rice farmland soil before the treatment was used as a control, and the results were as follows: figure 2 As shown, comparing the data before and after treatment, it was found that 95% of the di-n-butyl phthalate in the rice farmland soil was degraded and mineralized.

Embodiment 2

[0030] 1.0L of 1.0M KHCO 3 Add 15kg of crushed aqueous solution to the soil of a vegetable field polluted by dimethyl phthalate in a certain place in Chongqing. )cm carbon cloth as electrodes, the distance between the two electrodes is 20cm, and then a square wave pulse voltage of ±8.0V is applied to the two electrodes, and the pulse width is 10s (see image 3 ), electrochemical repair treatment for 2.5h.

[0031] The vegetable field soil after the above treatment was rinsed with water, the eluate was collected, filtered and then analyzed by liquid chromatography, and the vegetable field soil before the treatment was used as a control. The results were as follows: Figure 4 As shown, comparing the data before and after treatment, it was found that 90% of the dimethyl phthalate in the vegetable field soil was degraded and mineralized.

Embodiment 3

[0033] 2.0L of 1.5M NaHCO 3 Add 30kg of the water solution to the crushed paddy field soil polluted by diisononyl phthalate in a certain place in Chongqing, mix well and insert two sizes of 40 (length) cm×15 (width) cm×2 (thickness) A graphite plate of cm was used as an electrode, and the distance between the two electrodes was 35 cm. Then, a square wave pulse voltage of ±10.0 V was applied to the two electrodes with a pulse width of 40 s, and the electrochemical repair treatment was performed for 5 h. Among them, the concentration and degradation rate of diisononyl phthalate in rice farmland soil changed with electrolysis time as follows: Figure 5 shown by Figure 5 It can be seen that as the reaction time gradually increases, the concentration of diisononyl phthalate decreases gradually.

[0034] The rice farmland soil after the above treatment was rinsed with water, the eluate was collected, filtered, and then analyzed by liquid chromatography. The rice farmland soil befor...

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Abstract

The invention relates to a method for repairing and treating phthalate-polluted soil through hydrogen peroxide produced through pulse electrochemistry, and belongs to the technical field of soil repairing. The method specifically comprises the following steps: crushing the phthalate-polluted soil, adding the crushed phthalate-polluted soil into an aqueous solution containing bicarbonate radicals, uniformly conducting mixing, inserting two carbon electrodes, and then applying square-wave pulse voltage on the two carbon electrodes to carry out electrochemical remediation treatment. According to the method, air does not need to be introduced into the soil, a reaction electrode does not need to be periodically replaced, dissolved bicarbonate radicals in the soil are electrochemically activated, and mediated water is oxidized and converted into hydrogen peroxide, so that the phthalate-polluted soil is continuously and efficiently repaired and treated, and the method has the characteristics of simplicity, convenience, greenness and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for remediating phthalate-contaminated soil by pulse electrochemical generation of hydrogen peroxide. Background technique [0002] Phthalate ester compounds are important chemical raw materials, widely used in plasticizers, pesticide carriers and other fields. In the initial stage of the application of phthalates, scholars at home and abroad believed that they had low toxicity and no side effects on human health and the ecological environment, so they were widely produced and applied. Since 2000, a large number of studies have found that: a variety of phthalates (such as diisononyl phthalate, di-n-butyl phthalate, dimethyl phthalate, etc.) etc.) have the hazard of causing gene mutation, tissue canceration and deformity. Unfortunately, the agricultural mulch film used in large quantities in the early days in my country contained phthalates, which c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/085B09C2101/00
Inventor 刘坤何辉超杨杉柯改利李洪刚程敏范例李雨桐王健曾磊周炼川宾灯辉苏毅尹华张艺
Owner CHONGQING RES ACAD OF ECO ENVIRONMENTAL SCI
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