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A method of surfactant-enhanced advanced oxidation and electrokinetic remediation for the removal of organochlorine compounds in soil

A technology of electrodynamic repair and advanced oxidation, applied in the restoration of polluted soil, etc., can solve the problem of low removal efficiency of organic chlorine pollutants, achieve the effect of improving the efficiency of advanced oxidation reaction, promoting transmission and diffusion, and improving solubility

Active Publication Date: 2021-10-01
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defect of low removal efficiency of organochlorine pollutants in soil in the prior art, the present invention provides a combination of electrokinetic repair technology and advanced oxidation with electrokinetic repair technology, and simultaneously introduces surfactant and nano-zero-valent iron to synergistically strengthen removal Organochlorine method

Method used

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  • A method of surfactant-enhanced advanced oxidation and electrokinetic remediation for the removal of organochlorine compounds in soil
  • A method of surfactant-enhanced advanced oxidation and electrokinetic remediation for the removal of organochlorine compounds in soil
  • A method of surfactant-enhanced advanced oxidation and electrokinetic remediation for the removal of organochlorine compounds in soil

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The surfactant-enhanced electrokinetic repair method of eluting organic chlorine compounds in the soil of this embodiment specifically includes the following steps:

[0038] Step 1), the organochlorine compound-contaminated soil sample was collected from a polluted site downstream of the sewage treatment system of a pesticide factory in China. The soil sample was collected from the surface soil, ground through a 2mm sieve, and stored at 4°C for later use. Another part of the soil was taken for soil physical and chemical testing. Properties and mineral composition, the physical and chemical properties of the soil are shown in Table 1. The inorganic elements (As, Cd, Co, Cr, Cu, Mn, Ni, Pb, Zn) in the soil were analyzed by soil acid digestion, and the trace elements and other elements were quantitatively determined by Agilent 7700x and PE Optima8000. To measure the original conductivity of the soil, add 10g of dry soil sample into 50mL of distilled water, shake well for 3...

Embodiment 2

[0049] The method of surfactant-enhanced advanced oxidation and electric restoration to remove organic chlorine compounds in soil in this embodiment is basically the same as in embodiment 1, except that:

[0050] Step 3) 5 groups were set up in the experiment, group 1, group 2 and group 3 were contrast groups without nanometer zero-valent iron, the setting of group 1 was: adding TW80 with a volume concentration of 10% in the soil, group 2 The setting is: add Na with a mass concentration of 20% in the soil 2 S 2 o 8 , the setting of group 3 is: adding TW80 with a volume concentration of 10% and Na with a mass concentration of 20% in the soil 2 S 2 o 8 . Groups 4 to 6 are the experimental groups with nanometer zero-valent iron, and the setting of group 4 is: TW80 with a mass concentration of 10% and Na with a mass concentration of 20% are added to the soil at the same time. 2 S 2 o 8 . The setting of group 5 is: adding TW80 with a mass concentration of 10% in the soil, ...

Embodiment 3

[0069] This example analyzes the elution effect of surfactant TW80 on organic chlorine compounds in soil under different setting conditions, and the devices and operating steps used are basically the same as those in Example 1.

[0070] Step 1), get 20g of spare polluted soil in volumetric flask, add 0%, 5%, 10% and 20% TW80 solution respectively, use sulfuric acid and / or sodium hydroxide to adjust pH value to about 5 (maintain metal ion in soil Dissolution in the soil, keep the in-situ activation of the oxidant), and shake horizontally for 48 hours to elute the organochlorine compounds in the soil.

[0071] Step 2), weigh 2g of soil after elution, add appropriate amount of diatomaceous earth, mix well and pour into 15mL ASE extraction pool, use hexane / acetone (5:1, v / v) for extraction, ASE extraction conditions: extraction temperature 100°C, pressure 1500psi, preheating for 5min, static extraction for 5min, cycle once, nitrogen purge for 40s to collect all extracts. The extr...

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Abstract

The invention belongs to the technical field of soil pollution remediation, and relates to a method for removing organochlorine compounds in soil by enhanced advanced oxidation with surface ion active agent and electric remediation. Adding an oxidizing agent and a surfactant to the soil, and setting nanometer zero-valent iron near the anode of the electric repair device; 2) adjusting the pH value of the electrolyte, and starting the electric repair device to remove organic chlorine compounds in the soil. The oxidizing agent is at least one of persulfate, hydrogen peroxide, permanganate and hypochlorite. The method of the present invention is based on the combined treatment method of electrodynamic restoration + nanometer zero-valent iron + oxidizing agent + surfactant to synergistically remove organic chlorine pollutants in soil, and can realize a substantial increase in the removal rate of organic chlorine pollutants in soil, and at the same time can Achieve in situ removal.

Description

technical field [0001] The invention relates to the technical field of electrokinetic restoration analysis, and more specifically, relates to a method for removing organochlorine compounds in soil by enhancing advanced oxidation with surfactant and electrokinetic restoration. Background technique [0002] In recent years, human activities have disturbed the soil ecosystem, and organochlorine compounds in sites left over from the former pesticide industry have been severely polluted and spread widely. Pesticides are a serious global problem due to their persistence, long-distance mobility, bioaccumulation in adipose tissue, and high toxicity. At present, the remediation of pesticide-contaminated soil is a very challenging task. The demand for new environmentally friendly and economical technologies is increasing, and it is urgent to speed up the purification of contaminated sites. [0003] In-situ advanced oxidation technology is a widely used in-situ remediation technology ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C1/085
Inventor 王芳菲德乐·苏安农生弘杰相雷雷卞永荣蒋新
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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