Method for reinforcing pollutant desorption in fine soil particles

A technology for soil particles and pollutants, applied in the field of ectopic remediation of polluted soil, can solve the problems of insufficient separation, desorption and clarification, and achieve the effects of less washing liquid consumption, high controllability and wide application range

Inactive Publication Date: 2016-10-26
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0005] For ordinary single cyclone, one separation process may not be able to achieve sufficient separation, desorption and clarification effects

Method used

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  • Method for reinforcing pollutant desorption in fine soil particles

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Embodiment 1

[0033] 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 handle, is to use cyclone washing. In engineering, it is often necessary to strengthen the desorption of pollutants in fine soil particles. For a common single cyclone, one separation process may not be able to achieve the separation effect. The method of parallel connection can only expand the production capacity. Through the multi-stage single-stage, single-stage multi-stage or multi-stage multi-stage cyclone group connected in series, two operations of clarification and concentration can be completed at the same time. It requires two or more cyclones in series, at least one of which acts as a concentrator and the other acts as a clarifier. We can use a multi-stage one-stage hydrocyclone in series. In the soil leaching, the quality ...

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Abstract

The invention relates to a method for overflow-serial cyclone soil washing. The method comprises the following steps: carrying out stirring and washing treatment on a sieved fine soil particle suspension; enabling the sieved fine soil particle suspension to pass through two or more stages of overflow-serial hydrocyclones which are equipped with solid-liquid mixers in front of inlets respectively, so as to achieve fine separation for small-particle-size clay pollutants and improve a desorption capacity; and designing a corresponding structure for each stage according to an actual working condition to achieve the optimal operation conditions, thus lowering the cost and increasing the efficiency. The method realizes deep separation for waste water and the fine soil particles, and achieves a purpose of recycling a detergent. Parameters of the device disclosed by the invention can be adjusted and optimized according to the actual condition, effective removal for pollutants containing heavy metals, organic matters and the like is realized, and deficiencies in a present method for reinforcing desorption in soil washing are made up.

Description

technical field [0001] The invention relates to an overflow series swirl soil washing method, which 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 oil 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, etc. The polluted soil will seep into the ground, spread the pollution plume through the groundwater, cause secondary pollution, and then enrich and enter the human body through the soil-plant system or soil-plant-ani...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
CPCB09C1/02
Inventor 杨强孙荣江刘懿谦林匡飞
Owner EAST CHINA UNIV OF SCI & TECH
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