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Composite catalytic oxidation degradation method and device for organochlorine pesticide contaminated soil

A pesticide-contaminated soil and catalytic oxidation technology, applied in the field of soil remediation, can solve the problems of low removal rate, high cost of equipment introduction, lack of experience in engineering application, etc., and achieve high removal rate

Pending Publication Date: 2021-06-22
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since my country is still in its infancy in the field of contaminated site remediation, compared with the nearly 40-year history of contaminated site remediation in developed countries such as the United States and Western Europe, my country is far behind European and American countries in the research and development of contaminated site remediation technology and equipment, and is far from being able to adapt to my country. Urgent market demand in the field of contaminated site remediation
Developed countries started early, with mature technology and high equipment stability, but the cost of equipment introduction is high; domestic research and development of similar equipment has just started, the technical foundation is weak, and there is a lack of engineering application experience. The removal rate is low through a single technology, and the desired effect cannot be achieved. Therefore, a safe and reliable degradation method and device for organochlorine pesticide-contaminated soil are needed.

Method used

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  • Composite catalytic oxidation degradation method and device for organochlorine pesticide contaminated soil
  • Composite catalytic oxidation degradation method and device for organochlorine pesticide contaminated soil
  • Composite catalytic oxidation degradation method and device for organochlorine pesticide contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A composite catalytic oxidation degradation method for organochlorine pesticide-contaminated soil, comprising the following steps:

[0031] S1: Soil pretreatment: use tiller 4 to loosen and crush the contaminated soil first, and screen out stones, plastics and branches in the soil;

[0032] S2: Soil rinsing: use a soil remediation vehicle to shovel the soil into the leaching device 5, perform solid-liquid separation after rinsing the soil, and obtain wet soil and waste water;

[0033] S3: Wastewater treatment: transfer the obtained waste water to the photocatalytic box 6, then adjust the pH value of the waste water to 6.5, use the nickel mesh 61 loaded with titanium dioxide as the photocatalyst, the wavelength of ultraviolet light is 240nm, the photocatalytic reaction time of waste water 1.5h, accompanied by electromagnetic stirring during the photocatalysis, the stirring speed is 80r / min, the electromagnetic power is 100W, and then the waste water is introduced into th...

Embodiment 2

[0037] A composite catalytic oxidation degradation method for organochlorine pesticide-contaminated soil, comprising the following steps:

[0038] S1: Soil pretreatment: use tiller 4 to loosen and crush the contaminated soil first, and screen out stones, plastics and branches in the soil;

[0039] S2: Soil rinsing: use a soil remediation vehicle to shovel the soil into the leaching device 5, perform solid-liquid separation after rinsing the soil, and obtain wet soil and waste water;

[0040] S3: Wastewater treatment: transfer the obtained wastewater to the photocatalytic box 6, then adjust the pH value of the wastewater to 7, use nickel mesh 61 loaded with titanium dioxide as the photocatalyst, the wavelength of ultraviolet light is 250nm, the photocatalytic reaction time of wastewater 1.8h, accompanied by electromagnetic stirring during the photocatalysis, the stirring speed is 80r / min, the electromagnetic power is 100W, and then the waste water is introduced into the ultraso...

Embodiment 3

[0044] A composite catalytic oxidation degradation method for organochlorine pesticide-contaminated soil, comprising the following steps:

[0045] S1: Soil pretreatment: use tiller 4 to loosen and crush the contaminated soil first, and screen out stones, plastics and branches in the soil;

[0046] S2: Soil rinsing: use a soil remediation vehicle to shovel the soil into the leaching device 5, perform solid-liquid separation after rinsing the soil, and obtain wet soil and waste water;

[0047] S3: Wastewater treatment: transfer the obtained waste water to the photocatalytic box 6, then adjust the pH value of the waste water to 7.5, use the nickel mesh 61 loaded with titanium dioxide as the photocatalyst, the wavelength of ultraviolet light is 256nm, the photocatalytic reaction time of waste water 2h, with electromagnetic stirring during the photocatalysis period, the stirring speed is 80r / min, the electromagnetic power is 100W, and then the waste water is introduced into the ult...

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Abstract

The invention discloses a composite catalytic oxidation degradation method and a device for organochlorine pesticide contaminated soil, and relates to the technical field of soil remediation.The composite catalytic oxidation degradation method comprises the steps of S1, soil pretreatment, S2, soil leaching, S3, wastewater treatment, S4, wet soil treatment and S5, detection and evaluation.The majority of organochlorine pesticides in the soil are rapidly removed through leaching, organochlorine pesticide residues are rapidly reduced, and the content of the organochlorine pesticides in the soil is reduced; the residual organochlorine pesticide content in the wet soil is removed through thermal desorption, the removal rate of the residual organochlorine pesticide in the soil is high, the wastewater obtained after leaching is subjected to catalytic oxidation, the organochlorine pesticide in the wastewater is rapidly degraded, and the wastewater is recycled after being purified, so that the method is more environment-friendly and energy-saving.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a compound catalytic oxidation degradation method and device for organochlorine pesticide-contaminated soil. Background technique [0002] As the city "retreats from the second to the third", after the closure and relocation of the pesticide and chemical enterprises that were originally located in the urban area or in the suburbs, a large number of pesticide and chemical contaminated sites that need to be repaired have emerged. Because such sites generally have the characteristics of long production history, complex pollution components, high soil viscosity, large volume, wide area, and dense surrounding sensitive receptors, compared with other industrial polluted sites, they are more harmful, higher risk, and serious. It has become a major soil environmental problem that needs to be solved urgently. It is urgent to develop fast and high-throughput efficient treatment e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/06B09C1/10C02F9/08C09K17/40C02F101/36C09K101/00
CPCB09C1/02B09C1/065B09C1/105C02F9/00C09K17/40C02F1/32C02F1/66C02F1/725C02F1/36C02F2101/36C02F2305/10C09K2101/00
Inventor 邓绍坡周艳杨敏范婷婷姜登登李旭伟
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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