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A method for remediating H66-polluted soil

A technology of polluted soil, 666, applied in the restoration of polluted soil and other directions, can solve the problem of lack of technical solutions, and achieve the effect of wide application, low cost and high restoration efficiency

Active Publication Date: 2019-01-29
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But specifically how to find the appropriate combination mechanism of the electrokinetic method and the Fenton (Fenton) method, including suitable additives and their proportions, etc., so that the two technologies can effectively play a synergistic effect, has always been a technical problem in the art, and there is a lack of specific and feasible methods. technical solutions

Method used

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  • A method for remediating H66-polluted soil
  • A method for remediating H66-polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Remediation of soil HCH pollution by different voltage gradients

[0029] The background values ​​of 666 in the tested soil are shown in Table 1.

[0030] Set different voltage gradients, 1, 1.5, 2, 2.5, 3V / cm, 4 groups in total. Each group was energized for 192 hours, with three repetitions. Before repair and after repair, sample pretreatment and gas chromatography (GC) analysis and detection of HCH were carried out according to the national standard GB / T14550-2003 method.

[0031] The results showed that the degradation effect of 666 in each treatment increased with the enhancement of the voltage gradient. However, considering the cost and practical operation, the voltage gradient of 3V / cm is optimal.

Embodiment 2

[0032] Example 2: Remediation of H6H pollution in soil at different times of electrification

[0033] The background values ​​of 666 in the tested soil are shown in Table 1.

[0034] Set different power-on time, respectively 12h, 24h, 48h, 96h, 192h, a total of five groups. The voltage gradient of each group was 3V / cm, with three repetitions. Before repair and after repair, sample pretreatment and gas chromatography (GC) analysis and detection of HCH were carried out according to the national standard GB / T14550-2003 method.

[0035] The results showed that the treatment effect of 666 increased with the increase of electrification time, but the increase of treatment effect slowed down significantly after 192 hours of electrification, and the electrification time was no longer increased due to cost considerations.

Embodiment 3

[0036] Example 3: Study the effects of electrokinetics, Fenton, and electrokinetic-Fenton combination on remediation of soil HCH pollution.

[0037] The background values ​​of 666 in the tested soil are shown in Table 1.

[0038] Table 1 w of each sampling point 0 value

[0039]

[0040] Note: w 0 (Φ) represents the w of the sampling point whose normalized distance from the cathode is Φ 0 mean.

[0041] A. Electric group: Put the pretreated soil into the electrolysis device such as figure 1In this method, both catholyte and anolyte are NaCl solution, no permeable reaction wall is set, and the experiment is carried out under the condition of constant DC voltage 3V / cm, 192h. The pH value of the original soil was kept at 5.07 throughout the experiment, the water content was controlled at 35%, and both w (electrolyte) and w (cyclodextrin) were 2%. Plug in the electrode plug, turn on the power switch, and start the electrokinetic experiment.

[0042] B. Fenton's group: Fi...

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Abstract

The invention discloses a method for repairing hexachlorocyclohexane contaminated soil. The method comprises the following steps: electrolyte salt, beta-cyclodextrin and purified water are added in contaminated soil for uniformly mixing; the pH value of obtained soil is adjusted to 5.07; the obtained soil is put in an electric chamber of an electric device for electrically repairing; a plate, formed by a FeSO4.7H2O and restrained by a net, is inserted in the electric chamber near an anode by 6 cm as a permeable reaction wall; the electric device is started; and the electric soil repair time is 190-200 h. The repair technology needs no excavation, adopts in-situ repair, and is low in soil selectivity, wide in application range, simple in operation, lower in cost and high in repair effect; and the method can realize efficient and safe soil repair with low cost.

Description

technical field [0001] The invention belongs to the technical field of environmental chemistry, and in particular relates to the treatment and repair of polluted soil, in particular to a method for repairing H66 polluted soil. Background technique [0002] 666 (HCHs, the chemical formula is C 6 h 6 Cl 6 ), also known as hexachlorocyclohexane, is a kind of organochlorine insecticide, due to its high chemical, physical and biological stability. 666 as a typical POP s (Persistent Organic Pollutants), which was included in the control list of the Stockholm Convention on Persistent Organic Pollutants in 2011. According to historical statistics, when 666 ceased production in 1983, the cumulative production in my country had reached 4.9 million tons, accounting for 33% of the world's total production. And from the 1950s to 1983, my country's 666 has used about 400,000 tons. Historically, most areas such as Henan, Hebei, Shandong, Sichuan, Hunan, and Guangzhou have concentrate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/085
Inventor 田书磊聂志强迭庆杞俞哲彬孟棒棒黄启飞王琪
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI