Efficient slurry dewatering device and method based on ultrasonication

Abstract

The invention discloses an efficient slurry dewatering device and method based on ultrasonication. The method comprises steps as follows: to-be-dewatered slurry is added to the device, most of water in the slurry permeates a water permeable layer under the gravity or pressure effect, and the preliminary slurry and water separation step is finished; after the dewatering process is performed for a longer time, the water permeable layer can form a slurry film due to coverage of intercepted slurry, the sludge film layer thickens gradually, and the water permeability of the water permeable layer is reduced; an ultrasonic generator is started, and the slurry film is subjected to ultrasonication and the water permeability of the water permeable layer is remodeled under the ultrasonic cavitation effect. According to the efficient slurry dewatering method based on ultrasonication, the slurry film covering the surface of the water permeable layer is destroyed and the water permeability is remodeled under the ultrasonic cavitation effect, the dewatering period can be shortened, the dewatering efficiency can be improved, quick slurry reduction can be realized, the slurry treatment field is narrowed, and the slurry treatment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of mud dehydration, and in particular relates to a high-efficiency mud dehydration device based on ultrasonic crushing and a method thereof. Background technique [0002] In order to improve the water quality of rivers and lakes and ensure the normal flood discharge capacity and navigation capacity of rivers, large-scale dredging and dredging projects are being carried out in lakes and rivers in my country. These muds have high moisture content and low density, making them difficult to use directly. [0003] The existing treatment methods include mud-water separation technology through cyclone separation, plate and frame filter press, or natural drying in the storage yard. These technologies have some problems: 1. Cyclone separation has poor effect on mud containing more particles with a particle size of less than 45 microns; 2. The unit processing capacity of plate and frame filter press is low, and the inv...

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Problems solved by technology

These technologies have some problems: 1. Cyclone separation has poor effect on mud containing more particles with a particle size of less than 45 microns; 2. The unit processing capacity of plate and frame filter press is low, and the investment in equipment is large, which cannot be applied to large-scale Dredging and dredging works; 3. The natural drying of the storage yard occupies a large area and takes a long time period

[0004] At present, there is a vacuum filtration method that uses a permeable layer to treat mud with a high water content. However, due to the large amount of fine particles in the mud, the filter cloth will be blocked immediately during the suction filtration, and the dehydration efficiency is low, so it is difficult to be used for continuous dehydration of a large amount of mud.

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