Importance

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Abstract

A filter vessel is partitioned with a watertight partition to form a common upper filtrate collection compartment in the upper part of the filter vessel. A plurality of hollow fiber modules each having upper and lower filtrate outlet ports are vertically disposed in the filter vessel to communicate with the common upper filtrate collection compartment via the upper filtrate outlet ports thereof. The hollow fiber modules also communicate with a lower filtrate collection casing via the lower filtrate outlet ports thereof. At least one conduit is provided in the filter vessel to allow the lower filtrate collection casing to communicate therethrough with the common upper filtrate collection compartment. Feed water fed into the filter vessel is filtered through the walls of porous hollow fibers in the hollow fiber modules into the bores of the porous hollow fibers, through which the filtrate is conducted into the common upper filtrate collection compartment via the upper filtrate outlet ports of the hollow fiber modules as well as via the lower filtrate outlet ports of the hollow fiber modules, the lower filtrate collection casing and said at least one conduit. The filtrate collected in the common upper filtrate collection compartment is then discharged therefrom out of the filter column.

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First Claim