GB2259459A - Fine screen for sewage - Google Patents

Fine screen for sewage Download PDF

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Publication number
GB2259459A
GB2259459A GB9119420A GB9119420A GB2259459A GB 2259459 A GB2259459 A GB 2259459A GB 9119420 A GB9119420 A GB 9119420A GB 9119420 A GB9119420 A GB 9119420A GB 2259459 A GB2259459 A GB 2259459A
Authority
GB
United Kingdom
Prior art keywords
discs
screen
sewage
auger
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9119420A
Other versions
GB9119420D0 (en
Inventor
Peter George Nicholls
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9119420A priority Critical patent/GB2259459A/en
Publication of GB9119420D0 publication Critical patent/GB9119420D0/en
Publication of GB2259459A publication Critical patent/GB2259459A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B01D33/27—Filters with filtering elements which move during the filtering operation with rotary filtering surfaces, which are neither cylindrical nor planar, e.g. helical surfaces
    • B01D33/275—Filters with filtering elements which move during the filtering operation with rotary filtering surfaces, which are neither cylindrical nor planar, e.g. helical surfaces using contiguous impervious surfaces
    • 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
    • B01D33/466—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element scrapers
    • 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
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/60—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for washing
    • 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
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
    • B01D33/64—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression
    • B01D33/648—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression by screws

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Sewage (AREA)

Abstract

Sewage flowing along an open duct g is screened as it passes between axially spaced metal discs a, which rotate with a shaft c and are spaced apart by non-rotating sector-shaped plates (b) (Fig. 3), located above the sewage flow and acting as scrapers to remove solids retained by the discs and feed them into an auger j. where residual liquid is squeezed out. A further comb-like scraper I is normally stationary and submerged but intermittently pivots upwards about shaft c, to lift any solids which are retained by but fail to rotate with discs a round the disc peripheries to the auger. <IMAGE>

Description

FINE SCREEN FOR SEWAGE AND SIMILAR WASTE PRODUCTS This invention provides a means of fine screening raw sewage prior to treatment or sewage sludge pricr to centrifuginc or digesting.
Problems associated with fine screening of sewage Problems encountered in fine screening are:a) @logging of the screen reduces flow.
b) Solid faecal matter tends to be screened out of the flow.
C) Fine screens currently on the market tend to be expensive.
The invention.
invention covers a ffine screen which consists of rotating meta discs which transfer screenings t? a tuSe containing an auger which then compresses the screenings to a semi-dry state. Water, under pressure, wil help to breakndown solid faecal matter thereby allowing it to be washed through the screen.
Description.
(See Fi-. 1) The screen consists of a number of metal discs (a) which are attached to a shaft (c) and separated by suitable metal spacer plates (b Fig.3). The tickness of the metal spacerr plates (b) determines the gap through which the sewage is permitted to flow.
The discs (a) are shaft (c) are caused to rotate in a clockwise 1 direction as shown by means of an electric motor (d) through a reduction gearbox and chain (e). The shaft (c) rotates in bearings (f) which are mounted in suitable housings attached to the walls of a channel (g). Sewage (or sewage sludge) flows in the channel in the direction from left to right as shown. The diameters of the metal discs are such that, when positioned in the channel, the outer edges almost reach the bottom or floor of the channel.
Pags etc. (hereinafter reffered to as "screenings") which are contained In tc sea are caught or trapped by the metal discs and as these rotate the screenings are carried upwards in a clockwise direction until) they meet the top edges of the metal spacer plates tb, Fia. 2) when they are wiped off and carried or fall into the tube (i! containing the euger ().
Th- @uge@ 38 .s caused to rotate in either a clockwise or anticlockwises direction by an electric motor (d) through a suitable reduction gearbox and chain (k). Scrreenings are acrried with the to to the end of the tube (i) where the are compacted and squeezed into a semi-dry state until they are discharged from the tube.
A scraper (1) (shown more clearly in Fig.2) is also supported by shaft (c) but not attached to it. The bottom surface of the scraper (1) is wrapped around part of the circumference of the metal plates (a) (but not sufficient to Impede flow) but the plates (a) are free to rotate within it. A lever (n) is attached to the scraper (1) and connected to an electric motor (p) through a reduction gearbox and connecting rod(o). At pre-determined time intervals the motor (p) caused to rotate thereby rotating the scraper (1) clockwise through a pre-determined angle around the outside and in font of the metal discs (a).Small comb-like fingers (m) are attached to the leading edge of the scraper (1) and these will move between the metal discs (a) and lift any screenings, which have not travelled with the rotation of the discs, to the top of the discs to enable t?re.:- to be carried to the auger (j). When in the retracted position the screper rests against the stop (q).
Water at nress-re, may be forced onto the screenings through tube g-) before eterlng the auger tube (i) to break down solid faecal atter and a.'owng this to be washed back into the flow of sewage for treatment.
The profile of spacer plates (b) may be adjusted to allor the best possible transfer of screenings to the auger (j) and will not necessarily be of the shape shown in Fig.3.

Claims (3)

  1. FINE SCREEN FOR SEWAGE AND SIMILAR WASTE PRODUCTS 1) A screen comprising a number of metal discs, keyed to a shaft and separated by spacers of a thickness to give the desired screen aperture, for example 6mm.
  2. 2) A screen as claimed in Claim 1 wherein the metal discs are caused to rotate upwards out of the sewage flow by means of an electric motor attached, through a reduction gearbox, to the shaft to which the discs ars keyed.
  3. 3) A screen as claimed in Claim 1 or Claim 2 wherein the spacers are 5--aned to remove the screenings carried by the discs and to deposit thew into a cylinder containing an auger.
    A screen a claimed in claim 3 wherein the auger is caused to rotate by means cf an electric motor through 9 reduction gearbox.
    5)A sceen as claimed In Claim 1 and Claim 2 wherein an arm, to which se fixed comb-like projections, S caused to moia up and down so that tne comb-like projections move between the discs.
    A screen substantially as described barein with reference to figures 1 - 3 of the accompanying drawing
GB9119420A 1991-09-11 1991-09-11 Fine screen for sewage Withdrawn GB2259459A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9119420A GB2259459A (en) 1991-09-11 1991-09-11 Fine screen for sewage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9119420A GB2259459A (en) 1991-09-11 1991-09-11 Fine screen for sewage

Publications (2)

Publication Number Publication Date
GB9119420D0 GB9119420D0 (en) 1991-10-23
GB2259459A true GB2259459A (en) 1993-03-17

Family

ID=10701242

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9119420A Withdrawn GB2259459A (en) 1991-09-11 1991-09-11 Fine screen for sewage

Country Status (1)

Country Link
GB (1) GB2259459A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005121052A1 (en) * 2004-06-14 2005-12-22 Walter Schmid Ag Method and device for dewatering fermentation residues
EP2383232A1 (en) * 2010-04-29 2011-11-02 Omya Development AG System and Method for the Concentration of a Slurry

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB499021A (en) * 1937-04-12 1939-01-12 Charles Gilbert Hawley Improvements relating to apparatus for filtering or straining polluted liquids, sewage and the like
EP0268551A1 (en) * 1986-10-06 1988-05-25 Ueli Fritz Gut Mechanical separator for solid particles from waste waters
GB2242374A (en) * 1988-10-25 1991-10-02 Edward Victor Byers Rotary screening device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB499021A (en) * 1937-04-12 1939-01-12 Charles Gilbert Hawley Improvements relating to apparatus for filtering or straining polluted liquids, sewage and the like
EP0268551A1 (en) * 1986-10-06 1988-05-25 Ueli Fritz Gut Mechanical separator for solid particles from waste waters
GB2242374A (en) * 1988-10-25 1991-10-02 Edward Victor Byers Rotary screening device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005121052A1 (en) * 2004-06-14 2005-12-22 Walter Schmid Ag Method and device for dewatering fermentation residues
EP2383232A1 (en) * 2010-04-29 2011-11-02 Omya Development AG System and Method for the Concentration of a Slurry
WO2011135022A1 (en) * 2010-04-29 2011-11-03 Omya Development Ag System and method for the concentration of a slurry
JP2013527031A (en) * 2010-04-29 2013-06-27 オムヤ・デイベロツプメント・アー・ゲー System and method for slurry concentration
US9339763B2 (en) 2010-04-29 2016-05-17 Omya International Ag System and method for the concentration of a slurry
US9387439B2 (en) 2010-04-29 2016-07-12 Omya International Ag System and method for the concentration of a slurry
US9643126B2 (en) 2010-04-29 2017-05-09 Omya International Ag System and method for the concentration of a slurry

Also Published As

Publication number Publication date
GB9119420D0 (en) 1991-10-23

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)