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A soil remediation material and soil remediation method for oxidatively degrading organic pollutants

A technology for organic pollutants and soil remediation, which is applied in the field of soil remediation materials for oxidative degradation of organic pollutants. It can solve problems such as complex components, soil acidification, and easy consumption of active oxygen species, and achieves mild reaction conditions, simple process operation, and high efficiency. Effects of Processing Effects

Active Publication Date: 2021-07-23
SHANGHAI JIAOTONG 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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  • A soil remediation material and soil remediation method for oxidatively degrading organic pollutants
  • A soil remediation material and soil remediation method for oxidatively degrading organic pollutants
  • A soil remediation material and soil remediation method for oxidatively degrading organic pollutants

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Experimental program
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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 noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0034] Specific embodiments of the present invention refer to the process flow figure 1 shown.

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

[0036] The specific operation of oxidative degradation to remove petroleum hydrocarb...

Embodiment 2

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

[0045] Table 2

[0046] deal with Petroleum hydrocarbon residual rate (%) control 90.03％ Sodium pyrophosphate-iron clay mineral-calcium peroxide-urea peroxide 9.62％

Embodiment 3

[0048] Mix 0.5g stabilizer calcium superphosphate with polluted soil, and add 15g water to mix evenly, magnetically stir for 24h to mix evenly, add 0.075g activator iron-containing clay mineral, wherein iron mainly exists as FeOOH, add 0.03g calcium peroxide and 0.03g of urea peroxide is used as an oxidizing agent, and the aging time is 72h. During the aging process, water is added twice, 10g each time. After aging, the residual petroleum hydrocarbons in the soil were extracted and detected by GC.

[0049] table 3

[0050] deal with Petroleum hydrocarbon residual rate (%) control 90.03％ Calcium Superphosphate - Ferrous Clay Minerals - Calcium Peroxide - Urea Peroxide 8.37％

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PUM

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Abstract

The invention relates to a soil restoration material and a soil restoration method for oxidatively degrading organic pollutants. The soil restoration material includes a stabilizer, an activator and an oxidizing agent; the soil restoration method uses the soil restoration material and includes the following steps: S1: adding the stabilizer Add polluted soil, add water, stir and mix evenly, and age; S2: Add an activator and an oxidant to the soil obtained in step S1, and add water to mix to form a slurry; S3: Aging and curing the slurry obtained in step S2 to obtain decontaminated soil. Compared with the prior art, the process of the present invention is simple in operation, mild in reaction conditions, has high-efficiency treatment effect, and can be widely used in the field of remediation of organic polluted soil.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a soil remediation material and a soil remediation method for oxidatively degrading organic pollutants. Background technique [0002] In recent years, the country's soil organic pollution is facing a severe situation. According to the "National Soil Pollution Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources, the total point exceeding the standard rate of soil in the country is 16.1%. Polycyclic aromatic hydrocarbons, petroleum hydrocarbons, pesticides, antibiotics, etc. can exist and accumulate in soil for a long time. Removing 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, when adding catalytic materials and c...

Claims

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Application Information

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