Rotary disc filter having a backwash system that includes a compact nozzle support structure

Patent metadata

Field	Value
Publication number	US-11291935-B2
Application number	US-201815952474-A
Country	US
Kind code	B2
Filing date	Apr 13, 2018
Priority date	Apr 13, 2018
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

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.

First claim

What is claimed is:

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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. The rotary disc filter of claim 6 wherein a portion of the first end portion of the nozzle holder projects through the connector.

8. 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.

9. 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.

10. 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.

11. 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.

12. The rotary disc filter of claim 11 wherein a portion of the main conduit projects through the connector.

13. 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.

14. 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.

Assignees

• Veolia Water Solutions & Tech

Inventors

• Jibert Johan Gustav Alexander

Classifications

• B05B1/202

  comprising inserted outlet elements · CPC title

• B01D33/15

  with rotary plane filtering surfaces · CPC title

• B01D33/503

  the backwash arms, shoes acting on the cake side · CPC title

• B01D2201/084

  Nozzles placed on the filtrate side of the filtering element · CPC title

• B01D33/463

  nozzles · CPC title