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Soil remediation material for oxidative degradation of organic pollutants and soil remediation method

A technology for organic pollutants and soil remediation, which is applied in the field of soil remediation materials for oxidative degradation of organic pollutants, can solve the problems of complex composition, soil acidification, easy consumption of reactive oxygen species, etc., and achieves mild reaction conditions, simple process operation and high efficiency Effects of processing effects

Active Publication Date: 2020-04-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of this additive is complex, and it is easy to consume active oxygen species to reduce the catalytic efficiency of peroxides on pollutants; in addition, the environmental ecotoxicity of this additive is still unknown
In 2012, Venny et al. (Chemical Engineering Journal 180 (2012) 1-8) reported the use of 480mMH 2 o 2 and 60mM ferric nitrate as Fenton's reagent to remove polycyclic aromatic hydrocarbons in soil. This research uses liquid peroxide hydrogen peroxide. However, hydrogen peroxide is easily decomposed in soil to generate oxygen, which has the problems of rapid deactivation and low utilization efficiency.
In short, the current technology based on oxidation to remediate soil organic pollution still has problems such as soil acidification, rapid deactivation of peroxides, and low utilization efficiency of peroxides.

Method used

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  • Soil remediation material for oxidative degradation of organic pollutants and soil remediation method
  • Soil remediation material for oxidative degradation of organic pollutants and soil remediation method
  • Soil remediation material for oxidative degradation of organic pollutants and soil remediation method

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Embodiment 1

[0033] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be pointed out that for those of ordinary skill in the art, a number of modifications and improvements can be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0034] Reference process for specific embodiments of the present invention figure 1 Shown.

[0035] Obtaining petroleum-hydrocarbon contaminated soil: Take an appropriate amount of soil 10-20cm below the surface near the gas station pipeline, remove rubble and other impurities, dry the sample in a 60℃ oven for 48 hours, then grind it through a 400 mesh screen, and place it in a desiccator In the spare.

[0036] The specific operation of oxidative degradation and removal of pe...

Embodiment 2

[0044] Mix 0.5g of stabilizer sodium pyrophosphate with contaminated soil, and add 15g of water to mix well, magnetically stir for 24h, mix well, add 0.075g of activator iron-containing clay minerals, of which iron is mainly γ-Fe 2 O 3 Exist, add 0.03g calcium peroxide and 0.03g urea peroxide as oxidants, the aging time is 72h, add water twice during the aging process, add 10g each time. After the aging is over, the residual petroleum hydrocarbons in the soil are extracted and detected by GC.

[0045] Table 2

[0046] deal with Residual rate of petroleum hydrocarbon (%) Control90.03％ Sodium pyrophosphate-iron-containing clay minerals-calcium peroxide-urea peroxide 9.62％

Embodiment 3

[0048] Mix 0.5g of stabilizer calcium superphosphate with contaminated soil, add 15g of water to mix evenly, magnetically stir for 24h to mix evenly, add 0.075g of activator iron-containing clay minerals, of which iron is mainly present as FeOOH, add 0.03g of calcium peroxide and 0.03g of urea peroxide is the oxidant, and the aging time is 72h. During the aging process, add water twice, adding 10g each time. After the aging is over, the residual petroleum hydrocarbons in the soil are extracted and detected by GC.

[0049] table 3

[0050] deal with Residual rate of petroleum hydrocarbon (%) Control90.03％ Superphosphate-iron-containing clay minerals-calcium peroxide-urea peroxide8.37％

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PUM

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Abstract

The invention relates to a soil remediation material for the oxidative degradation of organic pollutants and a soil remediation method. The soil remediation material comprises a stabilizing agent, anactivating agent and an oxidizing agent. The soil remediation method adopts the soil remediation material and comprises the following steps: S1, adding the stabilizer into contaminated soil, adding water, uniformly stirring and mixing, and aging; S2, sequentially adding the activating agent and the oxidizing agent into the soil obtained in the step S1, and adding water to be mixed into slurry; andS3, aging and maintaining the slurry obtained in the step S2 to obtain decontaminated soil. Compared with the prior art, the method has the advantages of simple process operation and mild reaction condition and efficient treatment effect and can be widely applied to the field of organic contaminated soil remediation.

Description

Technical field [0001] The invention relates to the field of soil restoration, in particular to a soil restoration material and a soil restoration method for oxidatively degrading organic pollutants. Background technique [0002] In recent years, soil organic pollution across the country is facing a severe situation. According to the "National Survey Communiqué on Soil Pollution Status" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources, the country’s total soil pollution rate is 16.1%. Polycyclic aromatic hydrocarbons, petroleum hydrocarbons, pesticides, antibiotics, etc. can exist and accumulate in the soil for a long time, and the removal of these refractory and persistent organic pollutants is an important topic in the field of soil remediation. Chemical oxidation technology is often used in the field of soil remediation. Hydrogen peroxide, calcium peroxide, persulfate and other peroxides can generate reactive oxygen species su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/40C09K101/00C09K103/00
CPCB09C1/08B09C2101/00C09K17/40C09K2101/00C09K2103/00
Inventor 龙明策秦娇龙
Owner SHANGHAI JIAO TONG UNIV