| CPC B01D 65/02 (2013.01) [B01D 63/04 (2013.01); B01D 63/06 (2013.01); C02F 3/1273 (2013.01); C02F 3/208 (2013.01); B01D 2313/26 (2013.01); B01D 2315/06 (2013.01); B01D 2321/185 (2013.01)] | 11 Claims |
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1. A membrane filter configured for submerged operation for filtering a liquid, the membrane filter comprising:
membrane elements and geyser elements for pulsating flushing of the membrane elements with a gas, each of the membrane elements including:
hollow fiber membranes fixed in a base element of each of the membrane elements and respectively including a lumen so that a liquid permeate is filterable from the liquid into the lumen,
a permeate collection cavity connected with the lumen of the hollow fiber membranes and configured to collect the liquid permeate from the hollow fiber membranes,
a permeate outlet configured to drain the liquid permeate from the permeate collection cavity,
a respective tubular housing that envelops the hollow fiber membranes of each of the membrane elements and that is penetrated by the permeate outlet,
wherein the geyser elements are arranged below the membrane elements and each of the geyser elements includes:
a downward open gas collection cavity, and
an outlet device configured to let the gas out from the gas collection cavity of the geyser element through a singular opening directly into the tubular housing that envelops the hollow fiber membranes, so that the gas flows from the singular opening in upward direction in discrete sequential pulses directly into the tubular housing that envelops the hollow fiber membranes; and the membrane filter further comprising:
membrane units respectively including one of the geyser elements and plural of the membrane elements arranged at different levels above one another and above the one of the geyser elements, so that an upper membrane element of the plural membrane elements is arranged above a lower membrane element of the plural membrane elements,
wherein a tubular housing of the upper membrane element is flowed through in the upward direction by the gas flowing from a tubular housing of the lower membrane element,
wherein the liquid permeate in the lumen of the hollow fiber membranes of the upper membrane element flows in a downward direction and in a direction towards the tubular housing of the lower membrane element and in an opposite direction to the gas flowing from the tubular housing of the lower membrane element into the tubular housing of the upper membrane element,
wherein plural of the membrane units are arranged horizontally adjacent to each other and respectively include plural membrane elements respectively arranged horizontally adjacent to each other at the different levels,
wherein permeate outlets of the plural membrane elements respectively arranged horizontally adjacent to each other at the different levels are respectively connected by a common horizontal permeate collection conduit arranged at a level outside of each respective tubular housing of each of the plural membrane elements, and
wherein a second common horizontal permeate collection conduit arranged at a second level is arranged above a first common horizontal permeate collection conduit arranged at a first level wherein the first level and the second level are offset from each other along a longitudinal orientation of the hollow fiber membranes.
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