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Method for remedying contaminated soil through oxidation by ultraviolet/chlorine dioxide oxidation system

A technology for oxidizing and polluting soil with chlorine dioxide, applied in the field of soil remediation, can solve the problem of high toxicity of oxidation products, and achieve the effects of high soil remediation efficiency, promoting removal, and increasing contact probability.

Inactive Publication Date: 2020-09-22
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chemical remediation techniques usually require chemical oxidants, and chemical oxidants often produce toxic by-products, or incomplete oxidation leads to oxidation products that are more toxic than the original pollutants

Method used

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  • Method for remedying contaminated soil through oxidation by ultraviolet/chlorine dioxide oxidation system
  • Method for remedying contaminated soil through oxidation by ultraviolet/chlorine dioxide oxidation system
  • Method for remedying contaminated soil through oxidation by ultraviolet/chlorine dioxide oxidation system

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 1 , 2 As shown, an oxidation repair device includes a shell 4 (the shell 4 is made of a reinforced pallet), a plurality of low-pressure ultraviolet mercury lamps 1 arranged on the top of the shell 4, and a reactor all arranged inside the shell 4 2 and an oscillator 3, the low-pressure ultraviolet mercury lamp 1 is suspended above the reactor 2, and the reactor 2 is placed in the oscillator 3.

[0037] A method for using the above-mentioned oxidation restoration device to carry out ultraviolet / chlorine dioxide oxidation restoration of polluted soil, specifically comprising the following steps:

[0038] 1. Take by weighing 0.5g of polluted soil containing polycyclic aromatic hydrocarbons after crushing and screening (particle size is 0.25mm, initial pH=7.3, the mass content of polycyclic aromatic hydrocarbons is 1900mg / kg, including 16 kinds of anthracene, naphthalene and phenanthrene etc. polycyclic aromatic hydrocarbons) in a 40mL transparent glass bottle...

Embodiment 2

[0044] A kind of method that adopts the oxidative restoration device described in embodiment 1 to carry out ultraviolet / chlorine dioxide oxidative restoration polluted soil, specifically comprises the following steps:

[0045] 1. Take by weighing 0.5g of polluted soil containing polycyclic aromatic hydrocarbons after crushing and screening (particle size is 0.25mm, initial pH=7.3, the mass content of polycyclic aromatic hydrocarbons is 1900mg / kg, including 16 kinds of anthracene, naphthalene and phenanthrene etc. polycyclic aromatic hydrocarbons) in a 40mL transparent glass bottle (ie, the reactor).

[0046] 2. Add 10 mL of chlorine dioxide aqueous solution prepared by sodium chlorite-sulfuric acid method to the above transparent glass bottle, wherein the molar concentration of chlorine dioxide is 44.47mM, and mix it thoroughly. The preparation of chlorine dioxide aqueous solution is specifically as described in Example 1.

[0047] 3. Put the above-mentioned transparent glass...

Embodiment 3

[0051] A kind of method that adopts the oxidative restoration device described in embodiment 1 to carry out ultraviolet / chlorine dioxide oxidative restoration polluted soil, specifically comprises the following steps:

[0052] 1. Take by weighing 0.5g of polluted soil containing polycyclic aromatic hydrocarbons after crushing and screening (particle size is 0.25mm, initial pH=7.3, the mass content of polycyclic aromatic hydrocarbons is 1900mg / kg, including 16 kinds of anthracene, naphthalene and phenanthrene etc. polycyclic aromatic hydrocarbons) in a 40mL transparent glass bottle (ie, the reactor).

[0053] 2. Add 10 mL of chlorine dioxide aqueous solution prepared by sodium chlorite-sulfuric acid method to the above transparent glass bottle, wherein the molar concentration of chlorine dioxide is 44.47mM, and mix it thoroughly. The preparation of chlorine dioxide aqueous solution is specifically as described in Example 1.

[0054] 3. Put the above-mentioned transparent glass...

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Abstract

The invention relates to a method for remedying contaminated soil by oxidation by an ultraviolet / chlorine dioxide oxidation system, which specifically comprises the following steps: S1, adding a chlorine dioxide aqueous solution into the crushed and screened contaminated soil, and sufficiently and uniformly mixing to obtain a mixed solution; S2, irradiating the mixed solution obtained in the stepS1 under ultraviolet light, and carrying out an oscillation reaction to obtain a reaction solution; and S3, centrifuging the reaction solution obtained in the step S2, and discarding the supernatant to obtain the remediated soil. Compared with the prior art, the method has the advantages that the oxidation characteristic of chlorine dioxide and the characteristic that ultraviolet light promotes generation of hydroxyl radicals are utilized, so that soil organic pollutants are completely oxidized and degraded, toxic byproducts are not generated, the steps are simple, and the soil remediation efficiency is high.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for oxidizing and repairing polluted soil by an ultraviolet / chlorine dioxide oxidation system. Background technique [0002] Soil is an important environmental medium, which plays an important role as a storage and transfer station in the environment. In recent years, due to the rapid development of industrial and agricultural production and the continuous acceleration of rural urbanization, the area of ​​polluted soil in my country is constantly expanding, and the degree of pollution is also increasing day by day. Studies have shown that pollution sources such as coke oven coal combustion and diesel combustion are the main sources of polycyclic aromatic hydrocarbons in the soil of iron and steel industrial areas. Set cumulants. The monitoring and statistical data of polycyclic aromatic hydrocarbons in the polluted soil of chemical plants show that the polluti...

Claims

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Application Information

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IPC IPC(8): B09C1/08C09K17/02
CPCB09C1/08C09K17/02
Inventor 胡晓钧孙远张宏波牛文珂何于凤马晓红
Owner SHANGHAI INST OF TECH