Efficient dehydration system and dehydration method of soil washing slurry

Abstract

The invention discloses an efficient dehydration system and a dehydration method of soil washing slurry. The method comprises the following steps: conveying the slurry enriched with pollutants after soil washing and reducing to a closed pipeline mixer by a slurry pump and adding flocculating agents to the pipeline mixer at the same time; pumping the washing slurry subjected to flocculation reaction into geotextile pipe bags on a dehydration platform in the end; achieving efficient slurry-water separation and dehydration volume reduction in the geotextile pipe bags by the gravity and the pumping pressure; collecting the water removed from the bag bodies in a diversion trench around the dehydration platform and carrying out two-stage precipitation on water, thus achieving recycling of the water as process water; dehydrating and solidifying the washing slurry in the geotextile pipe bags, transporting the mud bodies obtained after dehydration and recycling or finally disposing the mud bodies according to the pollution properties of the mud bodies. The system has the positive effects that the geotextile pipe bags are applied to dehydration of the soil washing slurry for the first time; compared with systems adopting traditional mechanical dehydration (such as plate-frame pressure filtration), the system not only adopts a simple process, has high slurry handling capacity and high dehydration efficiency but also has the effect of greatly reducing electricity and manpower and is low in cost.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a high-efficiency dehydration system for soil washing mud and a method thereof. Background technique [0002] The problem of soil pollution in our country is becoming more and more serious, and a large number of urban industrial relics, industrial and mining sites, and polluted farmland need to be repaired urgently. Soil leaching, as one of the commonly used techniques for remediation of contaminated soil, has been relatively maturely applied abroad. At present, there are also cases of engineered soil leaching in China, which may be widely used in the future. [0003] There are two main methods for soil leaching to remediate polluted soil: one is the "washing process", that is, the pollutants in the soil are eluted and transferred to the eluent, and then the polluted water is treated in depth by relying on the mature water treatment technology. Mud liquid, in w...

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Problems solved by technology

Although mechanical dehydration has a good dehydration effect, there are disadvantages such as high one-time investment in equipment, high power and labor costs, need to build workshops, processing capacity cannot match the output of leaching mud, and cannot meet the requirements of the construction period.

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