Sewage sludge dewatering method coupled with electroosmosis and mechanical press filtration

Abstract

The invention discloses an electroosmosis and mechanical filter-pressing coupled sewage sludge dewatering method which comprises the following steps: (1) a primary mechanical filter-pressing dewatering stage: the sewage sludge enters a primary filter-pressing dewatering device, and the primary mechanical filter-pressing dewatering is realized in the primary filter-pressing dewatering device; (2) an electroosmosis and mechanical filter-pressing coupled dewatering stage: the anode plate and cathode plate of electroosmosis are arranged in a coupled dewatering cylinder, and a direct-current power supply supplies power to the anode plate and cathode plate of electroosmosis, the anode plate and cathode plate form a press-filtering cavity with the coupled dewatering cylinder, and mechanical filter-pressing between the anode plate and cathode plate is maintained while electroosmosis dewatering is realized; and (3) a high-pressure mechanical filter-pressing dewatering stage: the sludge water content of the anode plate is low; and at the moment, the direct-current power supply is cut off, the electroosmosis dewatering is stopped, and pressure between the anode plate and cathode is increased to realize high-pressure mechanical filter-pressing dewatering. By adopting the method disclosed by the invention, the sludge resistance of the anode layer is increased slowly, the dewatering effect is good, and the water content in the sludge thickness direction is in uniform distribution.

Description

technical field [0001] The invention relates to the field of sewage sludge treatment, in particular to a sewage sludge dewatering method coupled with electroosmosis and mechanical pressure filtration. Background technique [0002] The high water content of sludge is the bottleneck restricting the treatment and disposal of sludge. The sludge with high water content is not only bulky, but also contains a large amount of organic matter, heavy metals and harmful microorganisms, which are easy to be corrupted or released into the environment, causing secondary pollution. It will have adverse effects on the subsequent landfill, incineration and resource utilization of sludge. Therefore, sludge dehydration reduction is the primary purpose of sludge treatment, and reduction is the basis for realizing other "three modernizations" of sludge. The drier the sludge, the more beneficial the subsequent treatment and disposal. [0003] Electroosmotic dehydration technology utilizes a speci...

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Problems solved by technology

[0007] In view of this, the present invention provides an anode layer sludge resistance increase Sewage sludge dewatering method coupled with electroosmosis and mechanical pressure filtration, which is slow, has good dewatering effect, and uniform moisture content distribution in the direction of sludge thickness

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