# US 2019/0314743 A1 · Rotary disc filter having a backwash system that includes a compact nozzle support structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0314743 A1 - Document ID: US20190314743A1 - Status: Published application - Kind: A1 - Application number: 15/952,474 - Filed: 2018-04-13 - Published: 2019-10-17 - Earliest claimed: 2018-04-13 - Assignees: Veolie Water Solutions & Technologies Support - Applicants: Veolia Water Solutions & Technologies Support - Inventors: Johan Gustav Alexander Jibert - Web page: https://patentgrep.com/patent/US20190314743A1 ## CPC - B01D 33/21: with hollow filtering discs transversely mounted on a hollow rotary shaft - B01D 33/50: with backwash arms, shoes or nozzles - B01D 33/15: with rotary plane filtering surfaces - B01D 33/503: {the backwash arms, shoes acting on the cake side} - B05B 1/202: {comprising inserted outlet elements} - B01D 33/463: {nozzles} - B01D 2201/084: Nozzles placed on the filtrate side of the filtering element - 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) - B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D) ## Abstract A rotary disc filter having a backwash system that includes a series of feed pipes that project into and between successive filter discs that are mounted on a rotatable drum. Connected to an outer terminal end portion of the feed pipes is a series of nozzle holders. Each nozzle holder includes a main conduit, a series of branch conduits that project outwardly from the main conduit, and a connector for connecting the nozzle holder to a respective feed pipe. A series of detachable nozzles are secured to the outer terminal ends of the branch conduits. ## Claims ### Claim 1 A rotary disc filter for filtering water and removing suspended solids from the water comprising: a rotary drum for receiving water and having a plurality of openings for permitting the water to flow from the drum; a drive for rotatively driving the rotary drum; a series of disc-shaped filter members secured around the drum for receiving water from the drum; filter media disposed on opposite sides of the disc-shaped filter members for filtering the water as the water flows from the disc-shaped filter members outwardly through the filter media to yield filtered water; a backwash system for backwashing the filter media including: a series of backwash feed pipes configured to receive a backwash; a plurality of nozzle holders operatively connected to the feed pipes for receiving backwash therefrom; each nozzle holder comprising a single piece of molded plastic and including: an elongated main conduit having an outer wall and configured to receive the backwash from a respective feed pipe; a plurality of branch conduits integral with the outer wall of the main conduit and projecting outwardly from the outer wall of the main conduit; each branch conduit including an outer end portion and a through opening configured to channel backwash from the main conduit through the branch conduit; wherein the main conduit, outer wall and branch conduits comprise a single piece of molded plastic; and a nozzle secured to the outer end portions of the branch conduits. ### Claim 2 (depends on 1) The rotary disc filter of claim 1 wherein the main conduit includes a longitudinal axis and wherein at least two branch conduits projecting from the main conduit project in opposite directions. ### Claim 3 (depends on 1) The rotary disc filter of claim 1 wherein the main conduit includes a longitudinal axis and wherein at least two of the branch conduits projecting therefrom are offset with respect to the longitudinal axis. ### Claim 4 (depends on 1) The rotary disc filter of claim 1 wherein the main conduit includes a longitudinal axis and wherein at least two branch conduits project from the main conduit in opposite directions and are offset with respect to the longitudinal axis of the main conduit. ### Claim 5 (depends on 1) The rotary disc filter of claim 1 wherein the feed pipe includes a wall, a terminal end portion and at least one opening formed in the wall about the terminal end portion; and wherein a pair of said nozzle holders are secured to the terminal end portion of the feed pipe and communicatively open to the at least one opening in the wall of the feed pipe for permitting backwash to flow from the feed pipe into the main conduits of the nozzle holders. ### Claim 6 (depends on 1) The rotary disc filter of claim 1 wherein the feed pipe includes a terminal end portion having at least one opening; and wherein the nozzle holder includes first and second end portions and a molded plastic connector formed on the first end portion and integral with the nozzle holder, the connector configured to engage the terminal end portion of the feed pipe and secure the nozzle holder to the feed pipe such that backwash flows from the feed pipe, through the at least one opening in the terminal end portion thereof and into the main conduit of the nozzle holder. ### Claim 7 (depends on 6) The rotary disc filter of claim 6 wherein a portion of the first end portion of the nozzle holder projects through the connector. ### Claim 8 (depends on 7) The rotary disc filter of claim 7 wherein the portion of the first end portion of the nozzle holder that projects through the connector also projects into an opening formed in a wall of the feed pipe. ### Claim 9 (depends on 1) The rotary disc filter of claim 1: wherein the nozzle holder includes first and second end portions; a connector disposed on the first end portion of the nozzle holder and configured to secure the nozzle holder to the feed pipe; and a portion of the first end portion of the nozzle holder projecting through the connector and inserted into an opening formed in a wall of the feed pipe. ### Claim 10 (depends on 1) The rotary disc filter of claim 1 wherein a pair of nozzle holders are connected to a terminal end portion of the feed pipe in longitudinal alignment; and wherein each of the pair of nozzle holders include an integral connector disposed about one end portion thereof and which extends around a portion of the feed tube; and one or more fasteners for engaging the connectors and securing the connectors together such that the feed pipe is generally sandwiched between the two connectors and the nozzle holders. ### Claim 11 (depends on 1) The rotary disc filter of claim 1 wherein: the nozzle holder includes a connector configured to connect the nozzle holder to the feed pipe such that backwash can flow from the feed pipe into the nozzle holder; and wherein the main conduit, outer wall, branch conduits and connector comprise a single piece of molded plastic. ### Claim 12 (depends on 11) The rotary disc filter of claim 11 wherein a portion of the main conduit projects through the connector. ### Claim 13 (depends on 12) The rotary disc filter of claim 12 wherein the portion of the main conduit projecting through the connector interfaces with an opening formed in the feed pipe and wherein the connector engages the feed pipe and secures the nozzle holder to the feed pipe such that backwash flows from the feed pipe into the nozzle holder. ### Claim 14 (depends on 1) The rotary disc filter of claim 1 wherein the main conduit includes an outboard end that includes a generally round or spherical tip that generally prevents the nozzle holder from being damaged if the nozzle holder inadvertently engages the drum while the drum is rotating. ### Claim 15 A rotary disc filter for filtering water and removing suspended solids from the water comprising: a rotary drum for receiving water and having a plurality of openings for permitting the water to flow from the drum; a drive for rotatively driving the rotary drum; a series of disc-shaped filter members secured around the drum for receiving water from the drum; filter media disposed on opposite sides of the disc-shaped filter member for filtering the water as the water flows from the disc-shaped filter members outwardly through the filter media to yield filtered water; a backwash system for backwashing the filter media, the backwash system including: at least one backwash feed pipe configured to receive a backwash; a first nozzle holder operatively connected to the backwash feed pipe for receiving backwash therefrom; the nozzle holder including an elongated main conduit and a series of branch conduits projecting outwardly from the main conduit; wherein at least two of the branch conduits project generally in opposite directions from the main conduit of the nozzle holder; the branch conduits including terminal end portions and a throughway configured to channel backwash from the main conduit through the throughway and out the branch conduits; detachable nozzles secured to the terminal end portions of the branch conduits; and a connector disposed on the nozzle holder and configured to connect the nozzle holder to the feed pipe or to another nozzle holder. ### Claim 16 (depends on 15) The rotary disc filter of claim 15 further including a second nozzle holder; and wherein the connector is integral with each nozzle holder and wherein the integral connector is configured to connect the first and second nozzle holders to the feed pipe such that the first and second nozzle holders are aligned and extend outwardly from the feed pipe. ### Claim 17 (depends on 15) The rotary disc filter of claim 15 wherein the connector forms an integral part of the first nozzle holder and is configured to assist in securing the first nozzle holder to the feed pipe; and wherein the connector is disposed on a first end portion of the main conduit; and wherein the main conduit projects through the connector and into an opening formed in a wall of the feed pipe. ### Claim 18 (depends on 15) The rotary disc filter of claim 15 wherein the main conduit includes a longitudinal axis and wherein the branch conduits are longitudinally and circumferentially spaced and offset with respect to the longitudinal access of the main conduit. ### Claim 19 A rotary disc filter for filtering water and removing suspended solids from the water comprising: a rotary drum for receiving water and having a plurality of openings for permitting water to flow from the drum; a drive for rotatively driving the rotary drum; a series of disc-shaped filter members secured around the drum for receiving water from the drum; filter media disposed on opposite sides of the disc-shaped filter member for filtering the water as the water flows from the disc-shaped filter members outwardly through the filter media to yield filtered water; a backwash system for backwashing the filter media, the backwash system including: a series of backwash feed pipes configured to receive a backwash, each feed pipe including an opening; a plurality of nozzle holders operatively connected to the feed pipes for receiving backwash therefrom, the nozzle holder including: an elongated main conduit; a plurality of branch conduits projecting outwardly from the main conduit and including outer end portions; nozzles secured to the outer end portions of the branch conduits; each nozzle holder having an inner end; a connector disposed adjacent the inner end of the nozzle holder; wherein the inner end of the nozzle holder projects into the opening in the feed pipe; and wherein the connector is configured to be secured to the feed pipe and configured to support the nozzle holder in cantilever fashion and to assist in connecting the nozzle holder to the feed pipe such that the nozzle holder is communicatively connected to the feed pipe in order that backwash can flow from the feed pipe into the inner end of the nozzle holder. ### Claim 20 (depends on 19) The rotary disc filter of claim 19 wherein two nozzle holders are connected to the same feed pipe; and wherein there are two connectors disposed adjacent the inner ends of the two nozzle holders and both extend around a portion of the feed pipe and cooperate to connect both nozzle holders to the feed pipe such that each nozzle holder is communicatively connected to the feed pipe such that backwash can flow from the feed pipe into each of the nozzle holders. ### Claim 21 (depends on 20) The rotary disc filter of claim 20 wherein the connectors associated with the nozzle holders connect to each other and generally sandwich the feed pipe therebetween; and wherein the connectors support the two nozzle holders such that the two nozzle holders project outwardly from the feed pipe and are supported in cantilever fashion by the connectors. ### Claim 22 (depends on 19) The rotary disc filter of claim 19 wherein the main conduit includes a longitudinal axis and wherein the branch conduits projecting outwardly from the main conduit are offset with respect to the longitudinal axis of the main conduit. ### Claim 23 (depends on 19) The rotary disc filter of claim 19 wherein the main conduit, branch conduits and connector of the nozzle holder are integrally formed and together form a one piece plastic construction. ### Claim 24 (depends on 19) The rotary disc filter of claim 19 wherein the nozzle holder includes an outboard end and wherein there is formed on the outboard end a rounded or spherical tip for engaging the rotating drum in the event that the nozzle holder falls onto the rotating drum so as to prevent damage to the nozzle holder. ### Claim 25 A rotary disc filter for filtering water and removing suspended solids from the water comprising: a rotary drum for receiving water and having a plurality of openings for permitting water to flow from the drum; a drive for rotatively driving the drum; a series of disc-shaped filter members secured around the drum for receiving the water from the drum; filter media disposed on opposite sides of the disc-shaped filter member for filtering the water as the water flows from the disc-shaped filter members outwardly through the filter media to yield filtered water; a backwash system for backwashing the filter media, the backwash system including: a series of backwash pipes configured to receive a backwash, each feed pipe including an opening; an elongated nozzle holder operatively connected to the feed pipe for receiving backwash from the feed pipe; the nozzle holder including an elongated plastic main conduit having an outer wall and a plurality of plastic branch conduits permanently secured to the outer wall and projecting outwardly from the outer wall of the main conduit; each branch conduit including a through opening configured to permit backwash to flow from the main conduit through the through opening; a nozzle disposed on a terminal end portion of each branch conduit; and wherein the backwashing system is configured such that backwash flows into the feed pipe, into the main conduit, through the through opening in the branch conduits and out the nozzles secured to the terminal end portion of the branch conduits. ### Claim 26 (depends on 25) The rotary disc filter of claim 25 wherein the nozzle holder includes a connector permanently secured to the outer wall of the main conduit. ### Claim 27 (depends on 25) The rotary disc filter of claim 25 wherein the main conduit includes a longitudinal axis and wherein at least two branch conduits, projecting from the main conduit, project in opposite directions. ### Claim 28 (depends on 25) The rotary disc filter of claim 25 wherein the feed pipe includes at least one opening; wherein the nozzle holder includes first and second end portions; a connector permanently secured to the main conduit and configured to connect a first end portion of the nozzle holder to the feed pipe such that backwash flows from the feed pipe, through at least the one opening in the feed pipe and into the main conduit of the nozzle holder. ### Claim 29 (depends on 25) The rotary disc filter of claim 25 wherein the nozzle holder including the main conduit and the branch conduits comprises a single piece of molded plastic.