NZ779776B2 - Rotary disc filter having backwash guides - Google Patents

Rotary disc filter having backwash guides

Info

Publication number
NZ779776B2
NZ779776B2 NZ779776A NZ77977620A NZ779776B2 NZ 779776 B2 NZ779776 B2 NZ 779776B2 NZ 779776 A NZ779776 A NZ 779776A NZ 77977620 A NZ77977620 A NZ 77977620A NZ 779776 B2 NZ779776 B2 NZ 779776B2
Authority
NZ
New Zealand
Prior art keywords
filter
backwash
disc
drum
filter disc
Prior art date
Application number
NZ779776A
Other versions
NZ779776A (en
Inventor
Johan Gustav Alexander Jibert
Per Larsson
Emil Svensson
Filip Thysell
Original Assignee
Veolia Water Solutions & Technologies Support
Filing date
Publication date
Priority claimed from US16/293,772 external-priority patent/US11000791B2/en
Application filed by Veolia Water Solutions & Technologies Support filed Critical Veolia Water Solutions & Technologies Support
Publication of NZ779776A publication Critical patent/NZ779776A/en
Publication of NZ779776B2 publication Critical patent/NZ779776B2/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/08—Regeneration of the filter
    • B01D2201/081—Regeneration of the filter using nozzles or suction devices
    • B01D2201/084—Nozzles placed on the filtrate side of the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
    • B01D33/23—Construction of discs or component sectors thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
    • B01D33/463—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D33/50—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/76—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters

Abstract

rotary disc filter includes one or more filter discs secured to a rotary drum (40) and include a series of circumferentially spaced backwash guides (12) disposed in the filter disc. During backwashing, the backwash guides function to engage a mixture of backwash and suspended solids and guide or direct the mixture to a sludge trough disposed in the disc filter. The backwash guides generally assure that a greater percentage of the backwash and suspended solids mixture end up in the solids trough.

Claims (27)

1. A rotary disc filter for filtering liquid comprising: a rotary drum for receiving the liquid and having a plurality of openings formed in a 5 e thereof; a solids trough disposed in the drum and configured to receive a sh and suspended solids mixture; one or more filter discs secured to the drum and ured to receive the liquid from the drum and to filter the liquid as the liquid flows outwardly from the filter disc through filter media 10 forming a part of the filter disc; the filter disc including a filter frame for supporting the filter media and a plurality of openings formed in an inner periphery of the filter disc; a backwash system for backwashing the filter media and including a plurality of nozzles ed orly of the filter disc and configured to direct backwash h the filter media 15 and into the filter disc where the backwash dislodges suspended solids from the filter media to form the backwash and suspended solids mixture; a drive for rotatively driving the drum and causing the filter disc to rotate with the drum during a backwashing operation; a plurality of circumferentially spaced backwash guides projecting inwardly from the filter 20 frame into the interior of the filter disc and configured to engage the backwash and suspended solids mixture and facilitate the movement of the backwash and suspended solids e into the solids trough; and the backwash guides along with the filter frame forming at least a part of backwash channels disposed in the interior of the filter disc and configured to receive at least a portion of 25 the backwash and suspended solids mixture and to direct the backwash and suspended solids mixture through the openings in the inner perimeter of the filter disc where the backwash and suspended solids mixture pass through the openings in the drum and into the solids trough.
2. The rotary disc filter of claim 1 wherein the backwash guides are at least partially angled relative to the filter frame and t in the l direction of rotation of the filter disc during a backwashing operation. 5
3. The rotary disc filter of claims 1 and 2 wherein the backwash guides include elongated edges that terminate intermittently between opposite sides of the filter disc; and wherein the backwash guides are disposed in pairs within the filter disc and wherein each pair of backwash guides are transversely aligned and project inwardly towards each other where the ted edges terminate in spaced apart relationship to form an opening between ersely aligned 10 backwash guides.
4. The rotary disc filter of any one of the preceding claims wherein the filter frame includes a ity of circumferentially spaced support arms and wherein the sh guides project from a side of the support arms.
5. The rotary disc filter of any one of the preceding claims wherein the backwash guides are secured to or integrally formed with the filter frame.
6. The rotary disc filter of any one of the preceding claims wherein the filter media includes 20 a plurality of filter segments supported in the filter frame and wherein there is provided a ity of seals interposed between the filter segments and the filter frame; and wherein the backwash channels are formed by the sh guides, filter frame, seals, and filter segments.
7. A rotary disc filter for filtering liquid comprising: 25 a rotary drum for receiving the liquid and having a plurality of openings formed in a surface thereof; a solids trough disposed in the drum and configured to receive a backwash and suspended solids mixture; one or more filter discs secured to the drum and configured to receive liquid from the drum and filter the liquid as the liquid flows outwardly from the filter disc through filter media forming a part of the filter disc; the filter disc including a filter frame and plurality of openings formed in an inner 5 periphery of the filter disc; a backwashing system for shing the filter media and ing a plurality of nozzles disposed orly of the filter disc and configured to direct a sh through the filter media and into the filter disc where the backwash dislodges suspended solids retained on the filter media; 10 a drive for rotatively driving the drum and filter disc during a backwashing operation; a plurality of backwash guides disposed in the filter disc and ured to engage the backwash and suspended solids e during the backwashing operation and to guide the backwash and suspended solids mixture to the openings formed in the inner periphery of the filter disc after which the backwash and suspended solids flow through the openings in the drum 15 and into the solids trough; the backwash guides spaced inwardly from the filter media such that open spaces are defined between the backwash guides and the filter media; and wherein the open spaces disposed n the backwash guides and the filter media are configured such that during the backwashing operation the backwash and the suspended 20 solids mixture flows through the open spaces and through the openings formed in the inner periphery of the filter disc and to the solids trough.
8. The rotary disc filter of claim 7 wherein the backwash guides are angled away from the 25 filter frame.
9. The rotary disc filter of claims 7 and 8 wherein the filter media comprises a series of filter segments supported in the filter frame and wherein the backwash guides and filter segments form, in part at least, backwash channels that extend interiorly within the filter disc and which receive the backwash and suspended solids e and direct the backwash and suspended solids mixture through the filter disc.
10. The rotary disc filter of any one of claims 7 to 9 wherein the backwash guides disposed 5 in the filter disc include pairs of backwash guides that are transversely aligned and include al edges that ate in spaced apart relationship with respect to each other.
11. The rotary disc filter of any one of claims 7 to 10 wherein the backwash guides are secured to or integrally formed with the filter frame and extend inwardly therefrom into the filter 10 disc.
12. The rotary disc filter of any one of claims 7 to 11 wherein the open spaces form at least a part of a series of sh channels that extend through the filter disc, the backwash channels having an open side that faces the direction of travel of the filter disc during the 15 backwashing operation.
13. The rotary disc filter of claim 12 wherein the backwash channels extend between an outer periphery of the filter disc and the inner periphery of the filter disc, and wherein the backwash channels include inner end portions that terminate adjacent the openings in the inner 20 periphery of the filter disc.
14. A method of filtering a liquid and backwashing filter media in a rotary disc filter, comprising: directing the liquid into a rotary drum; 25 directing the liquid from the rotary drum into one or more filter discs secured to the rotary drum and having filter media disposed on opposite sides of the filter disc; ing the liquid and ng suspended solids from the liquid by directing the liquid from the filter disc outwardly through the filter media, causing at least some of the suspended solids in the liquid to be retained on an inner surface of the filter media; backwashing the filter media by: rotating the drum and the filter disc such that portions of the filter media are rotated into a position to be backwashed by nozzles disposed exteriorly of the filter disc; directing a backwash from the nozzles through the filter media and into the 5 interior of the filter disc and in the process, dislodging at least some of the ded solids retained on the inner surface of the filter media which gives rise to a backwash and ded solids mixture in the filter disc; receiving the backwash and suspended solids mixture in a series of backwash channels disposed in the filter disc; and 10 directing the backwash and suspended solids mixture through the backwash channels and from the backwash channels h openings in an inner periphery of the filter disc and through openings in the drum and into a solids trough disposed in the drum.
15 15. The method of claim 14 including backwashing the filter media as the drum, filter disc and backwash channels are rotated; and as the drum, filter disc and backwash ls are rotated, sweeping the sh and suspended solids mixture into the backwash channels.
16. The method of claims 14 and 15 wherein, as the filter disc is rotated, leading portions of 20 the backwash channels are open in the direction of travel.
17. The method of any one of claims 14 to 16 wherein there is provided a series of backwash guides that form a part of the backwash ls. 25
18. A rotary disc filter for filtering a liquid comprising: a rotary drum for ing the liquid and having a ity of openings formed in a surface thereof; a solids trough disposed in the drum and configured to receive a backwash and suspended solids mixture; one or more filter discs secured to the drum and configured to receive liquid from the drum and filter the liquid as the liquid flows outwardly from the filter disc through filter media forming a part of the filter disc; the filter disc including a ity of openings formed in an inner periphery of the filter 5 disc; each filter disc including a filter frame and filter segments supported in the filter frame and which form the filter media; the filter frame including a ity of circumferentially spaced support arms, the support arms extending between the inner periphery and an outer periphery of the filter frame; 10 the support arms form back-to-back grooves that receive and hold seals; each support arm includes an inner portion, an outer portion and a cross portion; a drive for rotatively driving the drum and causing the filter disc to rotate with the drum; a backwash system for backwashing the filter media and including a plurality of nozzles ed exteriorly of the filter disc and configured to direct the backwash through the filter 15 media and into the filter disc where the sh dislodges suspended solids from the filter media and a backwash and suspended solids mixture is formed; a plurality of backwash guides that project from one end of the inner portions of the support arms and at an angle ? of 2°-83° with respect to the inner portions of the support arms, and wherein the backwash guides t inwardly into the filter disc in the ion of rotation 20 of the filter disc during backwashing; wherein the backwash guides, along with ns of the support arms, the seals and the filter segments form backwash channels; the backwash channels including open sides that face in the direction of rotation of the filter disc; 25 wherein the backwash channels extend generally toward the openings in the inner periphery of the filter disc; wherein in a backwashing operation, the backwash channels are configured to e at least a portion of the backwash and suspended solids mixture and to direct the sh and the suspended solids to the openings in the inner perimeter of the filter disc where the backwash and suspended solids pass through the openings in the drum and into the solids trough; and wherein the backwash channels extend generally n the outer and inner peripheries of the filter disc, and wherein the backwash ls include inner end portions that 5 terminate nt the openings in the inner periphery of the filter disc.
19. The rotary disc filter of claim 18 wherein the backwash guides include terminal edges that terminate intermediately between opposite sides of the filter disc. 10
20. The rotary disc filter of claims 18 and 19 wherein the backwash guides projecting from the inner portions of the t arms are transversely aligned with backwash guides projecting from the other side of the filter disc.
21. The rotary disc filter of claim 20 wherein the transversely aligned backwash guides are 15 spaced apart such that an open area is defined between the transversely aligned backwash guides.
22. The rotary disc filter of any one of claims 18 to 21 wherein the backwash channels are ed in pairs with the pairs of backwash channels being transversely aligned and 20 circumferentially spaced around the filter disc.
23. The rotary disc filter of any one of claims 18 to 22 wherein the filter ts and the filter frame form a series of compartments around the filter disc; and wherein the backwash guides and the backwash channels are formed on leading edges of the tments.
24. A method of filtering a liquid and backwashing filter media in a rotary disc filter, comprising: directing the liquid into a rotary drum; directing the liquid from the rotary drum into one or more filter discs secured to the rotary drum and having filter media disposed on opposite sides of the filter disc; filtering the liquid and removing suspended solids from the liquid by directing the liquid from the filter disc outwardly through the filter media, causing at least some of the suspended 5 solids in the liquid to be retained on an inner surface of the filter media; wherein each filter disc includes a filter frame and filter segments supported in the filter frame which forms the filter media, and wherein the filter frame includes a ity of circumferentially spaced support arms extending between an inner periphery and an outer ery of the filter frame, and wherein the support arms form o-back grooves that 10 receive and hold seals; backwashing the filter media by: rotating the drum and the filter disc such that portions of the filter media are rotated into a position to be backwashed by nozzles disposed orly of the filter disc; directing a backwash from the s through the filter media and into the 15 interior of the filter disc and in the process, dislodging at least some of the suspended solids retained on the inner surface of the filter media which gives rise to a backwash and ded solids mixture in the filter disc; receiving the sh and suspended solids e in a series of circumferentially spaced backwash channels disposed in the filter disc; 20 wherein the backwash channels are formed by: a. a plurality of backwash guides that project from the inner portions of the support arms in the direction of rotation of the filter disc during backwashing; b. portions of the support arms; c. the seals; and 25 d. the filter segments; wherein the backwash channels include open sides that face in the direction of rotation of the filter disc during backwashing; and ing the backwash and suspended solids mixture into the open sides of the backwash channel and through the backwash channels and from the backwash channels through openings in an inner periphery of the filter disc and through openings in the drum and into a solids trough disposed in the drum.
25. The method of claim 24 including shing the filter media as the drum, filter disc 5 and backwash channels are rotated; and as the drum, filter disc and sh channels are d, sweeping the backwash and suspended solids mixture into the backwash channels.
26. A rotary disc filter for filtering liquid sing: a rotary drum for ing the liquid and having a plurality of openings formed in a 10 surface thereof; a solids trough disposed in the drum and ured to receive a backwash and suspended solids mixture; one or more filter discs d to the drum and configured to receive liquid from the drum and filter the liquid as the liquid flows outwardly from the filter disc through filter media 15 forming a part of the filter disc; the filter disc including a filter frame and a plurality of gs formed in an inner periphery of the filter disc; a backwashing system for backwashing the filter media and including a plurality of nozzles disposed exteriorly of the filter disc and configured to direct a backwash through the 20 filter media and into the filter disc where the backwash dislodges suspended solids retained on the filter media; a drive for rotatively driving the drum and filter disc during a backwashing operation; a plurality of backwash guides projecting inwardly from the filter frame into the filter disc and projecting in the general direction of rotation of the filter disc during backwashing; 25 wherein the backwash guides along with the filter frame and the filter media form backwash channels; wherein the backwash channels include open sides that face in the direction of rotation of the filter disc during backwashing; wherein the backwash guides are configured to engage the backwash and suspended solids mixture during the backwashing operation and to guide the backwash and suspended solids mixture into the open sides of the backwash channel and from the sh channel the backwash and suspended solids mixture is directed to the openings formed in the inner 5 periphery of the filter disc, after which the backwash and ded solids mixture flow through openings in the drum and into the solids trough; and wherein the backwash channels extend between an outer periphery of the filter disc and the inner periphery of the filter disc. 10
27. The rotary disc filter of claim 26 wherein the backwash guides ed in the filter disc include pairs of backwash guides that are transversely aligned and include terminal edges that ate in spaced apart relationship with respect to each other. FIG. 1
NZ779776A 2020-02-24 Rotary disc filter having backwash guides NZ779776B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16/293,772 US11000791B2 (en) 2019-03-06 2019-03-06 Rotary disc filter having backwash guides
PCT/IB2020/051544 WO2020178661A1 (en) 2019-03-06 2020-02-24 Rotary disc filter having backwash guides

Publications (2)

Publication Number Publication Date
NZ779776A NZ779776A (en) 2024-01-26
NZ779776B2 true NZ779776B2 (en) 2024-04-30

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