Suction filtration/concentration method and suction filtration/concentration device

Abstract

The invention provides a suction filtration / concentration method which comprises a sludge supply stage in which sludge is supplied to a filtration / concentration tank, a filtration / concentration stage in which the supplied sludge is concentrated by filtration within the filtration / concentration tank, a thick-sludge separation stage in which the thick sludge obtained by the filtration / concentration is separated from the outer surface of the filter cloth, and a thick-sludge discharge stage in which the separated thick sludge is discharged outside the filtration / concentration tank, wherein the filtration / concentration stage involves a step in which the thick sludge is adhered to the outer surface of the filter cloth by continuously performing suction at a given suction pressure that enables the thick sludge to retain the shape thereof even when separated in unconcentrated sludge, and the thick-sludge separation stage involves a step in which water is continuously and forcedly sent to the filter cloth via the filtration chamber over a given period to thereby separate, in the supplied unconcentrated sludge, the thick sludge (filter cake) adherent to the outer surface of the filter cloth. A suction filtration / concentration device is provided.

Description

technical field [0001] The present invention relates to a suction filtration concentration method and a suction filtration concentration device, and more particularly, to a suction filtration concentration method and a suction filtration concentration device that can be efficiently discharged to the outside without re-dissolving concentrated sludge. Background technique [0002] At present, in the concentration step of the sludge generated when the upper water is filtered, a suction filtration and concentration device using a siphon principle and a suction pump is used. Since this suction filtration concentration apparatus has a bag-shaped filter cloth which forms a filter chamber inside, the suctioned sludge (sludge before concentration) is separated into water and concentrated sludge. That is, the water|moisture content contained in sludge passes through the many pores of a filter cloth, and is guided into a filter chamber by this, and it collect|recovers as a filtrate. I...

AI Technical Summary

Problems solved by technology

Since the above-mentioned ejection sound and collision sound, which use the filter concentration tank as the sound source, echo in the filter concentration tank, it is easy to become additional noise.

[0008] Third, the concentrated sludge accumulated at the bottom of the filter thickening tank has no shape retention, and it is difficult to discharge the concentrated sludge to the outside

In addition, due to low-pressure suction, the concentrated concentration of the attached concentrated sludge is low, and the adhesion strength between the attached solid parts is weak

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