US 12,116,293 B2
Device and method for purifying drinking water
Jürgen Johann, Nußloch (DE); Mark Fink, Lörrach (DE); Mathias Schwaiger, Lochen am See (AT); Werner Kues, Köstendorf (AT); and Lorenz Haschka, Sankt Gilgen (AT)
Assigned to BWT Holding GmbH, Mondsee (AT)
Appl. No. 17/042,252
Filed by BWT Holding GmbH, Mondsee (AT)
PCT Filed Mar. 29, 2019, PCT No. PCT/EP2019/058079
§ 371(c)(1), (2) Date Sep. 28, 2020,
PCT Pub. No. WO2019/185908, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 10 2018 107 596.0 (DE), filed on Mar. 29, 2018.
Prior Publication US 2021/0047207 A1, Feb. 18, 2021
Int. Cl. C02F 1/44 (2023.01); B01D 61/02 (2006.01); B01D 61/08 (2006.01); B01D 61/10 (2006.01); B01D 65/02 (2006.01); B01D 65/08 (2006.01); C02F 1/50 (2023.01)
CPC C02F 1/441 (2013.01) [B01D 61/025 (2013.01); B01D 61/081 (2022.08); B01D 61/10 (2013.01); B01D 65/02 (2013.01); B01D 65/08 (2013.01); C02F 1/50 (2013.01); B01D 2311/06 (2013.01); B01D 2311/12 (2013.01); B01D 2311/2626 (2013.01); B01D 2311/2692 (2013.01); B01D 2313/18 (2013.01); B01D 2313/24 (2013.01); B01D 2321/04 (2013.01); B01D 2321/12 (2013.01); C02F 2201/005 (2013.01); C02F 2201/006 (2013.01); C02F 2303/04 (2013.01); C02F 2303/16 (2013.01); C02F 2303/185 (2013.01); C02F 2303/22 (2013.01); C02F 2307/06 (2013.01); C02F 2307/10 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for purifying drinking water, comprising:
conveying, during an extraction operation mode, drinking water to be purified through a semipermeable membrane (11) in reverse osmosis operation and separating the drinking water into permeate and concentrate;
allowing, during an extraction stop phase, the permeate to flow into a pressure tank (4), whereby a supply of permeate accumulates and is pressurized in the pressure tank (4); and
backflushing, during an idle operation state, pressurized permeate accumulated in the pressure tank through the semipermeable membrane (11) and thereby displacing the concentrate on a concentrate side of the semipermeable membrane and removing deposits that may be present on the concentrate side of the semipermeable membrane.