Pretreatment method and device for improving washing and desorption performance of soil

Abstract

The invention relates to a pretreatment method and device for improving the washing and desorption performance of soil. The pretreatment method comprises the following steps that vortex desorption pretreatment is completed through the combination of a jacket type spiral feeding screen and a hydrocyclone; the screened polluted soil is stirred in stirring tanks, an eluting agent is added, and / or ultrasonic equipment is adopted for cleaning; and after sufficient mixing and reaction, the soil enters the jacket type spiral feeding screen inclining by a certain angle, large particles are screened in a cylinder under spiral driving, middle and small particles penetrate through a screen, flow downwards along with water or a mixed solution of water and the eluting agent and return to the stirring tanks, then under the separation action of the hydrocyclone, small particles are discharged out of an overflow port, middle-sized particles are discharged out of an underflow port, and therefore classification of the large particles, the middle-sized particles and the small particles is achieved. Differential treatment is achieved, the vortex desorption performance of the soil is improved, and the pretreatment method is excellent. The pretreatment method has the advantages of being simple, convenient, efficient, capable of saving energy, fast, small in side effect, and free of secondary pollution. Parameters of the pretreatment device can be adjusted and optimized according to actual conditions, pollutants containing heavy metal, pesticides and the like are effectively removed, and the defects of the industrialized technology of current soil washing and desorption pretreatment are overcome.

Description

technical field [0001] The invention relates to a pretreatment method and device for improving soil washing and desorption performance, and belongs to the field of ectopic restoration of polluted soil. Background technique [0002] Soil is an important part of the ecological environment. With the vigorous promotion of the government and environmentalists, the importance of soil pollution restoration has become increasingly prominent. There are many reasons for the deterioration of the soil environment, such as: pollution caused by agricultural production, transportation and storage; pollution caused by petrochemical production, storage and transportation, gas station leakage; pollution of production sites in the steel coking industry; chromium salts, rare metals , pollution caused by heavy metal production and so on. Contaminated soil will seep into the ground, diffuse through groundwater and pollution plumes, cause secondary pollution, and then enrich and enter the human b...

AI Technical Summary

Problems solved by technology

[0005] Although cyclone washing desorption has many advantages, it has its disadvantages. It has high requirements on particle size. In order to make the system run smoothly and avoid clogging, it is necessary to optimize its pretreatment

Images