# US 2023/0264149 A1 · Compact water filtration device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0264149 A1 - Document ID: US20230264149A1 - Status: Published application - Kind: A1 - Application number: 18/012,013 - Filed: 2021-06-23 - Published: 2023-08-24 - Earliest claimed: 2020-06-26 - Assignees: Fgwrs - Applicants: Fgwrs - Inventors: Jean-Christophe LASSERRE - Web page: https://patentgrep.com/patent/US20230264149A1 ## CPC - B01D 61/58: Multistep processes - B01D 61/025: {Reverse osmosis; Hyperfiltration} - B01D 61/145: {Ultrafiltration} - C02F 1/441: {by reverse osmosis} - C02F 1/444: {by ultrafiltration or microfiltration} - B01D 2313/243: Pumps - B01D 2313/501: Permeate storage tanks - B01D 2315/20: Operation control schemes defined by a periodically repeated sequence comprising filtration cycles combined with cleaning or gas supply, e.g. aeration - B01D 2317/025: Permeate series - B01D 2321/04: Backflushing - B01D 2321/12: Use of permeate - B01D 2321/40: Automatic control of cleaning processes - C02F 2103/002: {Grey water, e.g. from clothes washers, showers or dishwashers} - C02F 2303/16: Regeneration of sorbents, filters - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) ## Abstract The invention relates to a method for filtering water comprising the use of a pump (14) to supply a filtering means (17), said supply being performed by simultaneous suction, for example by the same pump (14), through an ultrafiltration module (12). ## Claims ### Claim 1 A water treatment device comprising, on a pipe for water to be treated, an upstream membrane barometric clarification stage and a downstream advanced barometric purification stage, said downstream stage comprising an overpressure means upstream of a filtration means of the downstream stage, said filtration means of the downstream stage comprising a retentate outlet, the water treatment device also comprising a washing circuit for using water clarified by the water treatment device and accumulated in a tank to perform washing of said upstream membrane stage periodically, and the water treatment device being wherein it also comprises a command for controlling switching between an operating mode for producing filtered water comprising applying suction created by said overpressure means to a permeate outlet of the upstream stage and applying circulation to said retentate outlet in a pipe having a reinjection point on said pipe for water to be treated, on the one hand, and a periodic maintenance mode comprising circulating water toward the upstream stage from said tank that is placed downstream of a permeate outlet of said filtration means of the downstream stage, by said washing circuit, said washing circuit having an injection point on said pipe for water to be treated, said injection point of the washing circuit interfacing with the upstream of the overpressure means, and the reinjection point interfacing with the downstream of the overpressure means, on the other hand. ### Claim 2 (depends on 1) The water treatment device according to claim 1, wherein the upstream stage comprises a clarification module comprising a sealed rigid casing, within which a membrane is arranged, the casing being supplied at the inlet by a container for accumulated water to be treated. ### Claim 3 (depends on 1) The water treatment device according to claim 1, wherein the overpressure means is a single pump, or a group of several pumps in parallel or in series. ### Claim 4 (depends on 1) The water treatment device according to claim 1, wherein the washing of the upstream membrane stage comprises backwashing. ### Claim 5 (depends on 1) The water treatment device according to claim 1, wherein said filtration means of the downstream stage comprises a reverse osmosis unit. ### Claim 6 (depends on 1) The water treatment device according to claim 1, wherein a pump makes it possible to direct said clarified water toward the injection point on the pipe. ### Claim 7 (depends on 1) The water treatment device according to claim 1, wherein the upstream membrane barometric clarification stage comprises an ultrafiltration unit. ### Claim 8 (depends on 1) The water treatment device according to claim 1, wherein the overpressure means comprises a self-priming pump. ### Claim 9 (depends on 1) The water treatment device according to claim 1, wherein the overpressure means comprises a pump provided with an overflow valve configured to regulate the pressure at the outlet of the pump. ### Claim 10 (depends on 1) The water treatment device according to claim 1, wherein the periodic maintenance mode also comprises circulating water toward the downstream stage from said tank, to wash said filtration means of the downstream stage. ### Claim 11 (depends on 1) The water treatment device according to claim 1, wherein the periodic maintenance mode comprises washing cycles with said clear water. ### Claim 12 (depends on 1) A graywater filtration method, comprising using a water treatment device according to claim 1.