Multielement ex-situ remediation equipment and method used for organo-chlorine pesticide contaminated soil

Abstract

The invention discloses multielement ex-situ remediation equipment and method used for organo-chlorine pesticide contaminated soil, belongs to the technical field of materializing remediation equipment for contaminated sites. The equipment comprises a stirring device, an eluent injecting device, an eluent recovery device, an ultrasonic generator and a heater. The equipment has extremely strong remediation broad-spectrum performance for organo-chlorine pesticide site soil with different characteristics such as organo-chlorine pesticide substance types, soil contamination incidents, soil contamination concentration, soil organic matter content, soil texture and the like, and a removal rate by single or repeated continuous elution is higher (larger than or equal to 85%); the equipment can form a good matching technology with a patent eluent (ZL201010547630.2), and is developed specially aiming at solving actual contamination situation of organo-chlorine pesticide sites in our country; and during a process of manufacturing the equipment, on the basis of synergistic effects generated by multielement strengthening components such as stirring, ultrasonic, heating and the like, the parameter condition design is optimized, the distribution is scientific and reasonable, and the optimal integration of multielement strengthening components is reflected.

Description

technical field [0001] The invention belongs to the technical field of soil physical and chemical restoration equipment for polluted sites, and in particular relates to multi-element synergistic elution integrated equipment and a restoration method for soil restoration of high-concentration organochlorine pesticide-contaminated sites. Background technique [0002] In recent years, with the acceleration of my country's urbanization process and industrial transfer, as well as the implementation of national policies such as "retreating from two to three" and "retreating from cities to gardens", a large number of organochlorine pesticides (DDT, H66, Chlorine Dan, mirex, endosulfan, heptachlor, etc.) production enterprises, due to closure or relocation of high-concentration organochlorine pesticides polluted sites. Most of these polluted sites are located in the old urban areas or urban junctions, and are facing urgent land use function conversion and secondary development and uti...

AI Technical Summary

Problems solved by technology

The synergistic elution remediation technology is considered to be an effective means for soil remediation of such contaminated sites due to its high remediation efficiency, short cycle, and low cost. However, the available elution remediation equipment in my country is relatively limited Therefore, it is particularly urgent to develop integrated equipment for soil efficiency elution and remediation of supporting sites with independent intellectual property rights in my country.

[0003] At present, the patent applications for soil elution and remediation equipment in domestic sites mainly include: heavy metal contaminated soil leaching experimental device (application number: CN200710010441 and CN201110147310), but this type of equipment is only for in-situ leaching and remediation of heavy metal contaminated soil, not suitable for organochlorine Restoration of contaminated site soil; patent application for soil remediation equipment for organic polluted sites (Application No.: CN201110087565). Although the equipment incorporates stirring, ultrasonic and microwave strengthening technologies, its vertical single-blade stirring blade It is difficult to stir the mud system evenly in a short period of time; its ultrasonic transmitter is only installed at the bottom of the vertical mixing chamber and cannot directly contact the mud system, which greatly reduces the strengthening effect of ultrasonic technology; its microwave strengthening technology has the possibility of leakage Risk, and there are special requirements for the use of materials in the mixing chamber of the equipment, that is, metal materials cannot be used, and only a whole piece of PTFE material can be used for grinding. There are certain technical difficulties and safety hazards in the subsequent enlargement operation.

[0004] The main defects of existing elution equipment are: (1) Lack of ectopic elution repair equipment specific for high-concentration organochlorine pesticide-contaminated soil and the combination method of targeted elution reagents for this equipment; ( 2) The overall integration and synergy of the chimerism enhancement technology of the existing elution equipment is poor, and the optimal effect of the chimerism enhancement method cannot be fully exerted; (3) Most of the existing equipment are laboratory-scale instruments, and there are existing equipment Amplified technical bottlenecks and high costs make it difficult to widely promote in the short term

[0005] The main reasons for the defects are as follows: (1) With the widespread implementation of policies such as "retreating from the second to the third" and "retreating from the city to the park" across the country, there have been a large number of organochlorine pesticide production enterprises due to closure or relocation. High-concentration organochlorine pesticides pollute the soil of the site, and the early scientific and technological personnel focused on the theoretical research of the synergistic elution and remediation technology of this kind of contaminated soil in the laboratory, and the development of equipment to solve the actual pollution problem is relatively slow; (2) The restoration equipment is mainly aimed at the heavy metal-contaminated soil of industrial and mining industries, which were seriously polluted in my country, but the attention to the soil of organochlorine pesticide-contaminated sites has only gradually increased in recent years, so the research and development of corresponding supporting restoration equipment has not been followed up in time; ( 3) Although domestically developed synergistic elution remediation equipment for broad-spectrum organic polluted soil, the integration is poor, the design is not reasonable, and it is still far away from the actual site application

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