CPC B01D 33/215 (2013.01) [B01D 33/463 (2013.01); B01D 33/50 (2013.01); B01D 33/807 (2013.01); B01D 2201/184 (2013.01); B01D 2201/54 (2013.01)] | 23 Claims |
1. Apparatus comprising:
a liquid-permeable filtering element having first and second faces, the liquid-permeable filtering element movable into at least partial submersion in a liquid, the liquid-permeable filtering element configured for cyclical movement through the liquid such that:
when moved into a first position, an area of the first face of the liquid-permeable filtering element is subject to liquid under pressure and a pressure difference across the liquid-permeable filtering element is greater than 0 and less than or equal to 5.9 kPa; and
when moved into a second position, the area is not subjected to liquid under pressure or is subjected to liquid at a lower pressure difference,
at least one nozzle for directing at least one jet at the second face of the liquid-permeable filtering element through the liquid-permeable filtering element towards the first face of the liquid-permeable filtering element for removing and/or aiding removal of solids accumulated on the first face of the liquid-permeable filtering element;
wherein
the liquid-permeable filtering element has a pore size between 2 and 40 μm; and
the apparatus further comprises:
at least one gas feeder for introducing gas bubbles into the liquid during filtration by the liquid-permeable filtering element with the gas feeder positioned below the liquid-permeable filtering element in the first position so that when the liquid-permeable filtering element is in the first position and the gas feeder is introducing gas bubbles, the gas bubbles create turbulent motion along the first face of the liquid-permeable filtering element.
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