Suction type filtering-condensing apparatus

Abstract

Provided is a suction type filtering-condensing apparatus which does not reduce filtering efficiency and can guarantee filtering performance. The apparatus comprises a filtering-condensing bath (12) for housing treated fluid including filtering-condensing objects, and a plurality of filter plates (14) arranged in the filtering-condensing bath (12) and extending vertically along the filtering-condensing bath (12). Each of the filter plates (14) includes a support plate (50) vertically rugged in its surface and formed into a net shape, and a bag-shaped filter cloth (18) for housing the support plate (50), so that a filter chamber (76) is formed by the inner face of the filter cloth (18) and the support plate (50), and so that a vertically extending main passage for the filtrate is formed between the inner face of the filter cloth (18) and the recess of the support plate (50). Further comprised are a suction means (16) for sucking the filter cloth (18) through the filtering-condensing bath (12), a filter cloth bulging means (20) for bulging the filter cloth (18) through the filtering-condensing bath (12), and a filtrate discharging pipe (38) communicating at its one end with the filter chamber (76). The suction type filtering-condensing apparatus is characterized in that the transverse length of the filter cloth (18) is set larger than the transverse length of the support plate (50), and in that a temporary auxiliary passage (99) for the filtrate is formed, at the time of filtration and condensation of the filtering-condensing objects in the filtering-condensing bath(12)undera predetermined negative pressure according to the suction means (16), to communicate with the filter chamber (76) and to extend vertically of the filter chamber (76).

Description

technical field [0001] The invention relates to a suction filter concentration device, in particular, to a sludge filter concentration device which does not reduce the filtration efficiency and can ensure the filtration performance. Background technique [0002] In the prior art, a suction filter concentration device can be used to concentrate the coagulated sludge generated in a water purification plant, for example. Japanese Patent Publication No. 03-23203 discloses an example of a suction-type filter concentration device. [0003] The suction filter concentration device has: a sludge tank, which is used to accommodate sludge as a filter concentration target; several filter plates, which extend along the up and down direction of the sludge tank, and are adjacent to each other in the sludge tank, Configured in columns. Each filter plate has a support plate and a bag-shaped filter cloth which is slit integrally with the support plate to accommodate the support plate and fo...

AI Technical Summary

Problems solved by technology

[0008] In other words, there is a problem that the filtrate flow path formed between the filter cloth and the support plate is clogged and the filtration performance is reduced.

Therefore, this will reduce the operating performance of the device and reduce the filtration efficiency

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