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Combined type soil washing and desorption method and device

A combined desorption technology, applied in the field of ex-situ remediation of contaminated soil, can solve the problems of weak processing capacity and large chemical residues, and achieve the effects of high controllability, improved processing efficiency, and shortened leaching time

Active Publication Date: 2015-12-23
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The equipment has weak processing capacity and many chemical residues

Method used

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  • Combined type soil washing and desorption method and device
  • Combined type soil washing and desorption method and device
  • Combined type soil washing and desorption method and device

Examples

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Embodiment 1

[0051] After extensive and in-depth research, the inventors of the present application found that the most effective and cheap method for washing polluted soil, which is a solid-liquid system with a large amount of treatment and is difficult to deal with, is to use cyclone washing and desorption. Based on the research, the initial position of the particles at the inlet section of the cyclone has an important impact on the separation performance, while the particles at the inlet section of the conventional cyclone are chaotically distributed, and a new type of cyclone based on the sorting and regulation of the inlet particles is designed. For the cyclone with anti-rotation arrangement of particles, the particle size from the outer wall to the inner wall of the inlet is arranged from small to large, and the concentration is sorted from high to low, which can improve the separation efficiency; while the co-rotation arrangement can improve the classification efficiency. Based on th...

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Abstract

The invention relates to a combined type soil washing and desorption method and device. The method comprises the steps of spraying polluted soil, using a wet type multilevel vibratory screen for screening the soil, and removing large-particle-size stones or coarse sand which can be directly backfilled; conducting washing and desorption treatment on fine soil particle suspending liquid, and separating small-particle-size clay pollutants through hydrocyclones which are connected in series and provided with a solid-liquid mixer and a micro rotational flow sequencer respectively; conducting washing and desorption treatment and hydrocyclone separation on residual intermediate-particle-size sandy soil, and recycling washing liquid through a precision filter; conducting clear water washing treatment and hydrocyclone separation on soil obtained after filtration, conducting dehydration through a centrifugal machine, and finally achieving deep separation of waste water and soil particles. By means of the method and device, the purposes of soil backfill, tap water reutilization and washing agent recycling are achieved. Device parameters can be adjusted and optimized according to actual conditions, pollutants containing heavy metal, pesticide and the like can be effectively removed, and the deficiency that current soil washing cannot be industrialized is overcome.

Description

technical field [0001] The invention relates to a method and device for combined soil washing and desorption of cyclone, ultrasonic and detergent, and belongs to the field of ectopic restoration of polluted soil. Background technique [0002] Soil is an important part of the ecological environment and the basis for human survival. The deterioration of the soil environment is caused by many reasons, such as: the use of a large amount of chemical fertilizers and pesticides in agriculture; the discharge of a large amount of industrial wastewater in industry, the landfill of solid waste; the landfill of daily life garbage, etc. Contaminated soil will form secondary pollution to water resources, enrich and enter the human body through the soil-plant system or soil-plant-animal system food chain, directly endangering human health. Soil pollution has the characteristics of concealment, irreversibility, long-term nature, and serious impact. Therefore, the solution to soil pollution...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/02
CPCB09C1/00B09C1/02
Inventor 杨强孙荣江胡军卢浩许萧竺嘉斌
Owner EAST CHINA UNIV OF SCI & TECH
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