Ichikawa Woolen Textile Co., Ltd.

Shoichi Nakamura

Tetsuo Takeuchi

Shigeaki Sasaki

A sludge condensation and dewatering apparatus is described which comprises a condensation unit and a dewatering unit. The condensation unit comprises a flocculating reaction tank (1) for forming a sludge flock, a first holding tank (2) slantingly arranged and upwardly inclined along the moving direction of the sludge, a conveyor for conveying the sludge flock from the flocculation tank to the holding tank for retaining the sludge flock produced by the flocculation reaction tank and an endless running screen belt (3) located just below and adjacent to the first holding tank, a dewatering unit, a solidification device (13) in communication with the first holding tank located between the condensation unit and the dewatering unit. The dewatering unit comprises an upper running piled filter cloth (4) and a lower running piled filter cloth (5), a plurality of rolls (R.sub.1 -R.sub.18) for tensioning the upper and lower filter cloths and for moving them closer to each other so as to dewater, between the two filter cloths, the condensed sludge produced by the condensation unit, and then for moving the upper and lower filter cloths apart from each other, and guiding the condensed sludge held in place between both cloths, to wind over substantially the entire circumferential surface of a perforated roll (6) having a large diameter, and a plurality of pressure rolls (P.sub.1 -P.sub.7), arranged around the upper and lower filter cloths (4) and (5) and around the perforated roll. The invention also covers the process for condensing and dewatering a sludge to obtain a cake of low water content.

Sludge condensation and dewatering system

An apparatus for thickening and extracting the liquid from a sludge comprises a sludge-thickening assembly wherein solid matters in the sludge are coagulated to form coagulated flocs and the floc sludge is separated and thickened, and an assembly for extracting liquid from said floc sludge under pressure to obtain a dehydrated cake. The sludge-thickening assembly comprises coagulation means for the sludge, a first and a second screen rolls having a reticulate material covering the outer surface; and the assembly for extracting the liquid comprises an endless moving flocked filter belt, means for supporting the belt, a cylinder forced to closely contact with an upper portion of said endless moving flocked filter belt, and at least one press roll urging said endless moving flocked filter belt against said cylinder.

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Matsudo, Japan

Shoichi Nakamura