US 11,938,426 B2
Filtering apparatus and method
Carmine Elia, Pomezia (IT)
Assigned to O.M.IT S.R.L., (IT)
Appl. No. 17/293,101
Filed by O.M.IT S.R.L., Pomezia (IT)
PCT Filed Sep. 17, 2019, PCT No. PCT/EP2019/074913
§ 371(c)(1), (2) Date May 12, 2021,
PCT Pub. No. WO2020/098997, PCT Pub. Date May 22, 2020.
Claims priority of application No. 102018000010259 (IT), filed on Nov. 12, 2018; application No. 102018000010430 (IT), filed on Nov. 19, 2018; application No. 102019000011046 (IT), filed on Jul. 5, 2019; and application No. 102019000011058 (IT), filed on Jul. 5, 2019.
Prior Publication US 2021/0402334 A1, Dec. 30, 2021
Int. Cl. B01D 33/21 (2006.01); B01D 33/46 (2006.01); B01D 33/50 (2006.01); B01D 33/80 (2006.01)
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
OG exemplary drawing
 
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.