Layered electro-osmotic sludge dehydration device and using method thereof

Abstract

The invention discloses a layered electro-osmotic sludge dehydration device and a using method thereof. The device is a cylinder with electrodes and a filter drainage medium layer, wherein the electrodes are quincuncially arranged in the cylinder in a layered manner; the filter drainage medium layer is arranged on a bottom end cover and consists of a sand cushion, a water filter pipe network and reverse filter geotechnical cloth; the bottom end cover is connected with the cylinder through a flange to form a cavity. The using method of the layered electro-osmotic sludge dehydration device comprises the following steps of: sequentially energizing the electrodes of two different layers at an electrode interval in a layer-by-layer or alternate manner so as to ensure that the electrode on the upper layer is positive while the electrode on the lower layer is negative all the time; and deeply dehydrating sludge under the action of a vertical electric field and a gravity field. The electrodes are conductive plastic pipes and are unlikely to be corroded. After electro-osmotic dehydration, the electrodes can be taken out and recycled with the filter drainage medium layer. The layered electro-osmotic sludge dehydration device is low in cost, simple in process and large in one-time treatment capacity; secondary environment pollution is avoided; the advantageous conditions are provided for subsequent treatment and resource utilization of sludge.

Description

technical field [0001] The invention relates to a sludge layered electroosmosis dewatering device and a use method thereof, belonging to the technical field of sludge dewatering. Background technique [0002] With the development of social economy and urbanization in our country, the generation and quantity of urban sewage are constantly increasing. Sludge is an accessory after sewage treatment. It is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, and colloids. The amount of sludge usually accounts for 0.3% to 0.5% (volume) of the sewage volume or about 1% to 2% (quality) of the sewage treatment volume. A large amount of sludge is gradually becoming a source of environmental pollution. [0003] The water content of sludge can be as high as more than 99%, and the particles are finer, the specific gravity is smaller, and it is in a colloidal liquid state, so it is difficult to separate solids and liquids by sedimentat...

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Problems solved by technology

Chinese patent (publication number: CN 202543020 U) discloses a sludge dehydration and granulation device with synergistic effects of ring electric field and pressure. The problem of low energy consumption, the combination of electroosmotic dewatering and mechanical pressure filtration dewatering, there are insufficient sludge electroosmotic dehydration, uneven pressure distribution, high energy consumption, etc.; one of the reasons for the high energy consumption of sludge electroosmotic dehydration is Metal electrodes are used, and the corrosion of the metal electrodes seriously reduces the service life while increasing the contact resistance of the electrodes. The Chinese patent (publication number: CN 102720182 A) discloses a conductive plastic drainage plate that can play the role of drainage. At the same time, the corrosion of the electrode in the electroosmotic process is avoided, but the conductive plastic drainage board is difficult to recycle after use, and it is easy to be brittle during use.

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