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Abstract

An object of the present invention is to provide a filtering and condensing apparatus of the suction type which is capable of securing the filtering performance without deteriorating the filtering efficiency.A filtering and condensing apparatus of a suction type comprises a sludge tank for containing sludge to be filtered and condensed, and a filtering plate disposed to be in the sludge tank and extending in the vertical direction of the sludge tank. The filtering plate includes vertical extending convex and concave portions on its surface, and a filtering cloth in a bag form to house the supporting plate, whereby a filtering chamber is formed between the filtering cloth and the filtering plate and a main flow passage for the filtrate which vertically extends is formed between the inner surface of the filtering cloth and the concave portion of the supporting plate. The apparatus further includes a means for sucking the filtering cloth through the filtering chamber, a means for expanding the filtering cloth through the filtering chamber by feeding an air toward the filtering cloth via the filtering chamber, and a filtrate discharge tube one end of which is communicated with the filtering chamber. The lateral length of the filtering cloth is set to be longer than the lateral length of the supporting plate over its entire vertical direction, whereby, in a case where the sludge in the sludge tank is filtered and condensed under the predetermined negative pressure by the sucking means, a temporary sub-flow passage for the filtrate which is communicated with the filtering chamber and extends in the vertical direction of the filtering chamber is formed.

First Claim