Method for increasing speed of oxidative degradation of organic pollutant in soil

A technology for organic pollutants, oxidative degradation

Active Publication Date: 2015-04-15
江苏迈克环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method that can accelerate the oxidative degradation of organic pollutants in soil in view of the deficiencies in the existing advanced oxidative degradation repair methods for soil organic pollutants

Method used

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  • Method for increasing speed of oxidative degradation of organic pollutant in soil
  • Method for increasing speed of oxidative degradation of organic pollutant in soil
  • Method for increasing speed of oxidative degradation of organic pollutant in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Sampling of nitrochlorobenzene-contaminated soil left over from the relocation of a chemical factory in Nanjing (the same below, coexistence of ortho, para and meta), air-dried and ground through a 2mm sieve, weighed 5g of soil into a 50ml centrifuge tube, added 5ml For ultrapure water, stir well with a glass rod, then adjust the pH of the soil solution to 6.8 with 0.01M HCl or NaOH, then add 0.05g iron powder, shake in a constant temperature shaker at 25°C, react for 1 hour, and then add 2mL0.5mol ·L -1 Potassium persulfate, continue to shake at constant temperature, take samples every 1h, and measure the concentration of remaining nitrochlorobenzene in the soil.

[0042] Weigh 5g of soil into a 50ml centrifuge tube, add a certain volume of ultrapure water, stir well with a glass rod, adjust the pH of the soil solution to 6.8 with 0.01M HCl or NaOH, and then add 2mL of 0.5mol L -1 Potassium persulfate was shaken in a constant temperature shaker at 25°C, and samples we...

Embodiment 2

[0045] Sampling of nitrochlorobenzene-contaminated soil left over from the relocation of a chemical factory in Nanjing, air-dried and ground through a 2mm sieve, weighed 5g of soil into a 50ml centrifuge tube, added 5ml of ultrapure water, stirred with a glass rod, and then used 0.01M HCl or NaOH to adjust the pH of the soil solution to 6.8, after adding 0.05g of iron powder, add 2mL of 0.5mol L -1 Sodium permanganate was shaken at a constant temperature, and samples were taken every 1 hour to determine the concentration of remaining nitrochlorobenzene in the soil.

[0046] Weigh 5g of soil into a 50ml centrifuge tube, add a certain volume of ultrapure water, stir well with a glass rod, adjust the pH of the soil solution to 6.8 with 0.01M HCl or NaOH, and then add 2mL of 0.5mol L -1 Sodium permanganate was shaken in a constant temperature shaker at 25°C, and samples were taken every 1 hour to determine the concentration of residual organic matter in the soil.

[0047] Such as...

Embodiment 3

[0049] Sampling of nitrochlorobenzene-contaminated soil left over from the relocation of a chemical factory in Nanjing, air-dried and ground through a 2mm sieve, weighed 5g of soil into a 50ml centrifuge tube, added 5ml of ultrapure water, stirred with a glass rod, and then used 0.01M HCl or NaOH to adjust the pH of the soil solution to 6.8, after adding 0.05g of iron powder, add 2mL of 0.5mol L -1 The hydrogen peroxide was shaken at a constant temperature, and samples were taken every 1 hour to measure the concentration of remaining nitrochlorobenzene in the soil.

[0050] Weigh 5g of soil into a 50ml centrifuge tube, add 5ml of ultrapure water, stir well with a glass rod, then adjust the pH of the soil solution to 6.8 with 0.01M HCl or NaOH, then add 2mL of 0.5mol L -1 Hydrogen peroxide was shaken in a constant temperature shaker at 25°C, and samples were taken every 1 hour to determine the concentration of residual organic matter in the soil.

[0051] Such as image 3 , C...

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Abstract

The invention relates to the technical field of pollution repairing and treatment of organic pollutants in soil, and especially discloses a chemically repairing method used in soil polluted by nitrobenzene, nitrochlorobenzene and the like. By means of the method in which the nitrobenzene, the nitrochlorobenzene and the like are firstly reduced into phenylamine which is easy to oxidatively degrade with zero-valent iron and finally the degraded product is oxidized to generate carbon dioxide and water, the soil, which is polluted by the organic pollutants including the nitrobenzene and the like, is completely repaired and removal efficiency of the organic pollutants is increased. The method can achieve a removal rate of the nitrochlorobenzene being 88.3-95.8%, wherein the nitrochlorobenzene is a difficultly-degraded organic substance. The method can overcome problems of low removal efficiency, high medicine cost and troublesome follow-up treatment during removal of the nitrobenzene-series organic pollutants in the soil with Fenton reagents, potassium persulfate, sodium permanganate and the like which are common in the prior art. By means of an indirectly oxidative degradation in which reduction is carried out firstly and oxidization is carried out after that, usage amount of an oxidizing agent can be reduced and the removal rate of the nitrobenzene-series organic pollutants can be increased. Meanwhile, the method is simple in operation and can avoid secondary pollution to environment by the oxidizing agent. The method can effectively achieve in-situ repairing of polluted soil and is especially suitable for complete repair of the soil severely polluted by the organic pollutants in local factory removal.

Description

technical field [0001] The invention relates to the field of soil environmental protection, in particular to a method for accelerating the oxidative degradation of organic pollutants in soil. In particular, it relates to a chemical remediation method for contaminated soils such as nitrobenzene or nitrochlorobenzene. Background technique [0002] Compared with other organic pollutants, nitrobenzene compounds such as nitrochlorobenzene have a stable structure, long residual time, strong volatility, high toxicity, and difficult to degrade. They are widely used in industries such as medicine, chemical industry, dyestuff and national defense. After a large amount of nitrobenzene compounds are discharged into the environment during industrial production and application, they can be absorbed by the human body through the skin and respiratory tract, causing poisoning and even death, causing long-term harm to human health and the ecological environment. The transformation and harm ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 董长勋
Owner 江苏迈克环境工程有限公司
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