WO1992011211A1 - Apparatus for treating a fluid with a treatment medium - Google Patents

Apparatus for treating a fluid with a treatment medium Download PDF

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Publication number
WO1992011211A1
WO1992011211A1 PCT/GB1991/002179 GB9102179W WO9211211A1 WO 1992011211 A1 WO1992011211 A1 WO 1992011211A1 GB 9102179 W GB9102179 W GB 9102179W WO 9211211 A1 WO9211211 A1 WO 9211211A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
outlet
fluid
inlet
treatment
Prior art date
Application number
PCT/GB1991/002179
Other languages
French (fr)
Inventor
Clifford Brian Waller
Original Assignee
Thames Water Utilities Limited
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 Thames Water Utilities Limited filed Critical Thames Water Utilities Limited
Publication of WO1992011211A1 publication Critical patent/WO1992011211A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/10—Packings; Fillings; Grids
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/08—Aerobic processes using moving contact bodies
    • C02F3/082—Rotating biological contactors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the invention relates to apparatus for treating a fluid with a treatment medium, particularly for treating sewage with treatment media in what is known as a Rotating Biological Contactor (R.B.C.).
  • a Rotating Biological Contactor R.B.C.
  • prior R.B.C.'s sewage is passed into a housing which contains plastic discs which are fixedly mounted on a shaft so that the discs rotate when the shaft rotates and pass slowly through the sewage.
  • Naturally occurring micro-organisms develop on the discs as a film and provide a suitable biological treatment to purify the sewage.
  • the shaft in order to rotate, is supported on bearings and these bearings take a great deal of torque as the slow rotation cakes place. This leads to wear and relatively rapid seizure of the bearings, which have to be replaced. This means that the treatment is interrupted and the bearings, which are expensive nave to be replaced.
  • apparatus for treating a fluid with a treatment medium comprising a housing having an inlet and an outlet for fluid, a packing of discrete treatment media substantially throughout the housing between the fluid inlet and outlet, and external rotational support means adapted to support and rotate the housing, whereby on relative rotation between the housing and media and passage of fluid from the inlet to the outlet, the discrete treatment media contact the fluid for treatment thereof.
  • the housing may be cylindrical. This provides a relatively simple construction.
  • the inlet may be in one end wall and the outlet at an opposite end wall of the housing. Again, this provides for a simple construction and feed to and from the apparatus.
  • the outlet may comprise a plurality, preferably eight, of outlet ports leading to a manifold. This provides for a smooth outlet flow.
  • the discrete treatment media may comprise a plurality of plastic spheres. This provides an efficient media having an optimum treatment surface area.
  • the plastic spheres may be of different sizes. This provides for close packing of the spheres and enhanced contact.
  • the retaining means may comprise a plurality of perforated discs extending diametrically of the housing. This ensures that the interior of the housing is maintained full of evenly distributed media.
  • the discs may be blank in a central region thereof and perforated in an annular edge region thereof.
  • the means to rotate the housing may comprise a rotatable wheel or wheels and a drive motor and gearbox. One or both of the wheels may be driven.
  • the whole apparatus may be mounted on a skid.
  • FIG. 1 is a longitudinal sectional view through one embodiment of apparatus according to the invention for treating sewage with treatment media
  • Fig. 2 is an end elevational view of the apparatus of Fig.1, taken in the direction of arrow 'A' in that Figure;
  • Fig. 3 is a side elevational view of a second embodiment of apparatus according to the invention for treating sewage with treatment media
  • Fig. 4 is a longitudinal sectional view through a second embodiment of apparatus according to the invention.
  • Fig. 5 and 6 are respectively end elevational views in the direction of the Arrows A', B' of Fig.3.
  • FIGs. 1 and 2 a first embodiment of apparatus 1 for treating a fluid with a treatment medium, comprising a housing 3 having an inlet 4 and outlet 5 for fluid, a packing of discrete treatment media 2 substantially throughout the housing 3 between the fluid inlet 4 and outlet 5, and external rotational support means 6, adapted to support and rotate the housing 3 whereby on rotation of the housing 3 and passage of fluid from the inlet 4 to the outlet 5, the discrete media 2 contact the fluid for treatment thereof.
  • the housing 3 is cylindrical and lies with its longitudinal axis 'X' substantially horizontal, one end of the cylinder being closed by a wall 8 in which there is the inlet 4 for fluid and the other end being closed by a wall 9 opposite the one end and in which opposite wall 9 there is the outlet 5 for fluid in the form of a plurality of annularly spaced apart outlet ports 5a which lead into a manifold 10. There are eight such outlet ports 5a.
  • the fluid being treated is sewage in the embodiment and in this case the treatment media 2 comprises a plurality of plastic spheres 11, of different diameters, which effectively fill the cylinder 3, or drum.
  • the treatment media 2 comprises a plurality of plastic spheres 11, of different diameters, which effectively fill the cylinder 3, or drum.
  • Each disc 12 is perforated over an annular region 13 adjacent the periphery, and is blank in the central region 14.
  • the discs 12 assist in retaining the spheres 11 packed evenly in the housing 3.
  • the cylinder 2 is mounted on the means 6 comprising external wheels spaced apart along the length thereof as wheel sets, one of which is driven via a suitable drive motor and gearbox 17.
  • the wheel sets 6 themselves are supported on a suitable sub-frame 18.
  • sewage flows into the cylinder 3 through the inlet 4 up to an operational liquid level indicated by the chain dashed line 'Y' in Fig.1.
  • the housing 3 is rotated on the wheels 6 by operation of the motor 17 and this ensures that the liquid and plastic spheres
  • the suction air system 15, 16 provides odour control.
  • the control means effective to control emission of noxious effluvia from the housing 3 comprises a manifold 101 at the inlet end 4 and a manifold 102 at the outlet end 5, there being forced air supply means such as a blower fan 103 for forcing air into the inlet manifold 101 which is therefore at a higher pressure than ambient so that noxious effluvia are maintained in the apparatus 100 and do not escape therefrom.
  • forced air supply means such as a blower fan 103 for forcing air into the inlet manifold 101 which is therefore at a higher pressure than ambient so that noxious effluvia are maintained in the apparatus 100 and do not escape therefrom.
  • Air once it has passed through the apparatus 100 exits through a pipe 104 at the outlet manifold 105, to preferably, peat filters.
  • a flexible seal such as a rubber air seal 106 at each end of the housing 3 adjacent the respective manifolds 101, 102 to seek to obviate air leakage.
  • a media support grill 107 Internally of the housing 3 there is a media support grill 107 which maintains the media in the housing.
  • the housing 3 has spaced circumferential guide means 108 in the form of guide rails in which wheels 109 are received.
  • the wheels 109 are driven wheels, there being a drive motor and gearbox 110 intermediate the wheels 109 substantially centrally of the housing 3.
  • the whole apparatus 3 is mounted on a sub-frame 18 in the form of skid so that the apparatus 100 may be transported.
  • the outlet nozzles 5 in the outlet manifold may be twenty one in number, eight of which have bell mouths 5a and thirteen of which 5b are blanked off. This provides for varying through flows in that more outlets than eight can be opened up.
  • the whole apparatus 100 may be received within a retaining wall on a base such as a concrete base laid down for receiving the apparatus.
  • the housing 3 also has two access covers 112 by which access to the interior can be gained. Each access cover has a central hole 113.
  • the rotation of the housing 3 ensures an efficient oxygen exchange between the slime, and assists in sloughing off surplus slime.
  • the blank 14 parts of the discs 121 also act to prevent short-circuiting of the flow of sewage through the housing 3 so that the sewage and spheres 11 come into thorough mixing contact during treatment.
  • the spheres 11 are of any suitable material such as plastic and are relatively light in weight, having a specific gravity relative to that of the sewage such that the spheres 11 would float, or be semi-submerged therein.
  • the apparatus 1 is, it will be understood, modular.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biological Treatment Of Waste Water (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

A rotary biological contactor (or R.B.C.) comprises a housing (3) having an inlet (4) and outlet (5) for fluid, a packing of discrete treatment media (2) substantially throughout the housing (3) between the fluid inlet (4) and outlet (5), and external rotational support means (6) adapted to support and rotate the housing (3) whereby on rotation of the housing (3) and passage of fluid from the inlet (4) to the outlet (5), the discrete media (2) contact the fluid for treatment thereof.

Description

APPARATUS FOR TREATING A FLUID WITH A TREATMENT MEDIUM
The invention relates to apparatus for treating a fluid with a treatment medium, particularly for treating sewage with treatment media in what is known as a Rotating Biological Contactor (R.B.C.).
In prior R.B.C.'s, sewage is passed into a housing which contains plastic discs which are fixedly mounted on a shaft so that the discs rotate when the shaft rotates and pass slowly through the sewage. Naturally occurring micro-organisms develop on the discs as a film and provide a suitable biological treatment to purify the sewage. Unfortunately, in prior R.B.C.'s the shaft, in order to rotate, is supported on bearings and these bearings take a great deal of torque as the slow rotation cakes place. This leads to wear and relatively rapid seizure of the bearings, which have to be replaced. This means that the treatment is interrupted and the bearings, which are expensive nave to be replaced.
It is accordingly an object of the invention to seek to mitigate these disadvantages.
According to the invention there is provided apparatus for treating a fluid with a treatment medium, comprising a housing having an inlet and an outlet for fluid, a packing of discrete treatment media substantially throughout the housing between the fluid inlet and outlet, and external rotational support means adapted to support and rotate the housing, whereby on relative rotation between the housing and media and passage of fluid from the inlet to the outlet, the discrete treatment media contact the fluid for treatment thereof.
The housing may be cylindrical. This provides a relatively simple construction.
The inlet may be in one end wall and the outlet at an opposite end wall of the housing. Again, this provides for a simple construction and feed to and from the apparatus. The outlet may comprise a plurality, preferably eight, of outlet ports leading to a manifold. This provides for a smooth outlet flow.
The discrete treatment media may comprise a plurality of plastic spheres. This provides an efficient media having an optimum treatment surface area.
The plastic spheres may be of different sizes. This provides for close packing of the spheres and enhanced contact.
There may be a plurality of spaced apart media retaining means interiorly of the housing and the retaining means may comprise a plurality of perforated discs extending diametrically of the housing. This ensures that the interior of the housing is maintained full of evenly distributed media. The discs may be blank in a central region thereof and perforated in an annular edge region thereof.
There may be means adapted to control emission of noxious effluvia from the housing, for example a forced air supply means into an inlet manifold or a suction means for maintaining a reduced pressure at the outlet end.
The means to rotate the housing may comprise a rotatable wheel or wheels and a drive motor and gearbox. One or both of the wheels may be driven.
The whole apparatus may be mounted on a skid.
Apparatus embodying the invention is hereinafter described, by way of example, with reference to the accompanying drawings.
Fig. 1 is a longitudinal sectional view through one embodiment of apparatus according to the invention for treating sewage with treatment media; Fig. 2 is an end elevational view of the apparatus of Fig.1, taken in the direction of arrow 'A' in that Figure;
Fig. 3 is a side elevational view of a second embodiment of apparatus according to the invention for treating sewage with treatment media;
Fig. 4 is a longitudinal sectional view through a second embodiment of apparatus according to the invention; and
Fig. 5 and 6 are respectively end elevational views in the direction of the Arrows A', B' of Fig.3.
Referring to the drawings in which like parts are referred to by like reference minerals, there is shown in Figs. 1 and 2 a first embodiment of apparatus 1 for treating a fluid with a treatment medium, comprising a housing 3 having an inlet 4 and outlet 5 for fluid, a packing of discrete treatment media 2 substantially throughout the housing 3 between the fluid inlet 4 and outlet 5, and external rotational support means 6, adapted to support and rotate the housing 3 whereby on rotation of the housing 3 and passage of fluid from the inlet 4 to the outlet 5, the discrete media 2 contact the fluid for treatment thereof.
The housing 3 is cylindrical and lies with its longitudinal axis 'X' substantially horizontal, one end of the cylinder being closed by a wall 8 in which there is the inlet 4 for fluid and the other end being closed by a wall 9 opposite the one end and in which opposite wall 9 there is the outlet 5 for fluid in the form of a plurality of annularly spaced apart outlet ports 5a which lead into a manifold 10. There are eight such outlet ports 5a.
The fluid being treated is sewage in the embodiment and in this case the treatment media 2 comprises a plurality of plastic spheres 11, of different diameters, which effectively fill the cylinder 3, or drum. There is interiorly of the cylinder 3 a plurality of media retaining means in the form of spaced perforated discs 12 extending diametrically of the housing 3.
Each disc 12 is perforated over an annular region 13 adjacent the periphery, and is blank in the central region 14. The discs 12 assist in retaining the spheres 11 packed evenly in the housing 3.
In order to control emission of noxious effluvia from the apparatus 1, there is suction means in the farm of a fan 15 in a pipe 16.
The cylinder 2 is mounted on the means 6 comprising external wheels spaced apart along the length thereof as wheel sets, one of which is driven via a suitable drive motor and gearbox 17. The wheel sets 6 themselves are supported on a suitable sub-frame 18.
In use, sewage flows into the cylinder 3 through the inlet 4 up to an operational liquid level indicated by the chain dashed line 'Y' in Fig.1. The housing 3 is rotated on the wheels 6 by operation of the motor 17 and this ensures that the liquid and plastic spheres
11 are brought into intimate contact for treatment of the sewage as it flows from the inlet 4, through the perforations 13 in the discs
12 to the outlet ports 5a whence it passes to the manifold 10 and thence to further processing through a pipe 19. The suction air system 15, 16 provides odour control.
Referring now to Figs. 3 to 6, there is shown a second embodiment of apparatus 100 which is similar to the first embodiment. Figs, 1, 2 and similar parts are identified by like reference numerals but are not described in order to avoid repetition. In the second embodiment 100, the control means, effective to control emission of noxious effluvia from the housing 3 comprises a manifold 101 at the inlet end 4 and a manifold 102 at the outlet end 5, there being forced air supply means such as a blower fan 103 for forcing air into the inlet manifold 101 which is therefore at a higher pressure than ambient so that noxious effluvia are maintained in the apparatus 100 and do not escape therefrom. Air, once it has passed through the apparatus 100 exits through a pipe 104 at the outlet manifold 105, to preferably, peat filters. There is a flexible seal such as a rubber air seal 106 at each end of the housing 3 adjacent the respective manifolds 101, 102 to seek to obviate air leakage. Internally of the housing 3 there is a media support grill 107 which maintains the media in the housing.
Externally, the housing 3 has spaced circumferential guide means 108 in the form of guide rails in which wheels 109 are received. The wheels 109 are driven wheels, there being a drive motor and gearbox 110 intermediate the wheels 109 substantially centrally of the housing 3. There is a drive connection 111 between the motor and gearbox 110 and the wheels 109 whereby the latter are driven in synchronism.
The whole apparatus 3 is mounted on a sub-frame 18 in the form of skid so that the apparatus 100 may be transported.
The outlet nozzles 5 in the outlet manifold may be twenty one in number, eight of which have bell mouths 5a and thirteen of which 5b are blanked off. This provides for varying through flows in that more outlets than eight can be opened up.
The whole apparatus 100 may be received within a retaining wall on a base such as a concrete base laid down for receiving the apparatus. The housing 3 also has two access covers 112 by which access to the interior can be gained. Each access cover has a central hole 113.
It will be understood that in both embodiments there is a build up of naturally occurring micro-organisms on the surface of the spheres 11 as a biological 'slime' and this provides the necessary biological treatment to treat the sewage, and to purify it, as it passes from the inlet 4 to the outlet 5. The rotation of the housing 3 ensures an efficient oxygen exchange between the slime, and assists in sloughing off surplus slime. The blank 14 parts of the discs 121 also act to prevent short-circuiting of the flow of sewage through the housing 3 so that the sewage and spheres 11 come into thorough mixing contact during treatment. The spheres 11 are of any suitable material such as plastic and are relatively light in weight, having a specific gravity relative to that of the sewage such that the spheres 11 would float, or be semi-submerged therein.
The apparatus 1 is, it will be understood, modular.

Claims

1. Apparatus for treating a fluid with a treatment medium, comprising a housing having an inlet and an outlet for fluid, and a packing of discrete treatment media substantially throughout the housing between the fluid inlet and outlet, characterised by external rotational support means adapted to support and rotate the housing (3) whereby on rotation of the housing (3) and passage of fluid from the inlet (4) to the outlet (5), the discrete treatment media (11) contact the fluid for treatment thereof.
2. Apparatus according to Claim 1, characterised by the housing
(3) being cylindrical.
3. Apparatus according to Claim 2, characterised by the inlet
(4) being in one end (8) wall and the outlet (5) at an opposite end wall (9) of the housing (3).
4. Apparatus according to Claim 3, characterised by the outlet
(5) comprising a plurality of outlet ports (5, 5a) leading to a manifold (10, 102).
5. Apparatus according to any preceding claim, characterised by the discrete treatment media (11) comprising a plurality of plastic spheres.
6. Apparatus according to Claim 5, characterised by the plastic spheres (11) being of different sizes.
7. Apparatus according to Claim 6, characterised by a plurality of spaced apart media retaining means (12) interiorly of the housing (3).
8. Apparatus according to Claim 7, characterised by the retaining means (12) comprising a plurality of perforated discs extending diametrically of the housing (3).
9. Apparatus according to Claim 8, characterised by a central blank part (14) and an annular perforated edge part (13) of each disc (12).
10. Apparatus according to any of Claims 4 to 9, characterised by means (15, 103) adapted to control emission of noxious effluvia from the housing (3).
11. Apparatus according to Claim 10, characterised by the control means (15, 103) comprising blower or suction fan means (15 or 103).
12. Apparatus according to any preceding claim, characterised by the means (6,7,109) to rotate the housing (3) comprising rotatable wheels (6,7109) and a drive motor and gearbox (17, 110).
13. Apparatus according to Claim 12, characterised by one of the wheels (6) being driven.
14. Apparatus according to any preceding claim, characterised by the means (6, 7, 109) being supported in guide means (108).
15. Apparatus according to any preceding claim, characterised by flexible seal means (106) at the inlet (4) and outlet (5).
16. Apparatus according to any preceding claim, characterised by being mounted on a skid (18).
PCT/GB1991/002179 1990-12-20 1991-12-09 Apparatus for treating a fluid with a treatment medium WO1992011211A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9027688.2 1990-12-20
GB9027688A GB9027688D0 (en) 1990-12-20 1990-12-20 Apparatus for treating a fluid with a treatment medium

Publications (1)

Publication Number Publication Date
WO1992011211A1 true WO1992011211A1 (en) 1992-07-09

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ID=10687364

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/002179 WO1992011211A1 (en) 1990-12-20 1991-12-09 Apparatus for treating a fluid with a treatment medium

Country Status (7)

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EP (1) EP0565534A1 (en)
AU (1) AU9037391A (en)
GB (1) GB9027688D0 (en)
IE (1) IE914305A1 (en)
NZ (1) NZ241058A (en)
PT (1) PT99874A (en)
WO (1) WO1992011211A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1971555A1 (en) * 2006-01-04 2008-09-24 Clewer OY Bioreactor and method for the biological purification of water
DE102008007530A1 (en) * 2008-02-05 2009-08-06 Multi Umwelttechnologie Ag Method and reactor for biological cleaning of water such as process water and wastewater by using solid bodies, comprise storing the bodies in a reactor in a suspension state and in a constant motion, and adhering a biofilm to the bodies
US11524913B2 (en) 2016-12-23 2022-12-13 Ecotricity Group Limited Waste water purification system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2169266A1 (en) * 1972-01-26 1973-09-07 Europ Plastic Machinery Mfg
EP0008810A1 (en) * 1978-09-13 1980-03-19 Funk, Michael Process and device for the biological purification of waste water by the activated-sludge process
EP0165730A1 (en) * 1984-05-30 1985-12-27 Ortech Corporation Process and biological contact gas scrubber for waste gas purification

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2169266A1 (en) * 1972-01-26 1973-09-07 Europ Plastic Machinery Mfg
EP0008810A1 (en) * 1978-09-13 1980-03-19 Funk, Michael Process and device for the biological purification of waste water by the activated-sludge process
EP0165730A1 (en) * 1984-05-30 1985-12-27 Ortech Corporation Process and biological contact gas scrubber for waste gas purification

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
'LEHR- UND HANDBUCH DER ABWASSERTECHNIK, DRITTE AUFGABE, BAND IV' 1985 , ABWASSERTECHNISCHE VEREINIGUNG , BERLIN *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1971555A1 (en) * 2006-01-04 2008-09-24 Clewer OY Bioreactor and method for the biological purification of water
EP1971555A4 (en) * 2006-01-04 2012-02-29 Clewer Oy Bioreactor and method for the biological purification of water
DE102008007530A1 (en) * 2008-02-05 2009-08-06 Multi Umwelttechnologie Ag Method and reactor for biological cleaning of water such as process water and wastewater by using solid bodies, comprise storing the bodies in a reactor in a suspension state and in a constant motion, and adhering a biofilm to the bodies
US11524913B2 (en) 2016-12-23 2022-12-13 Ecotricity Group Limited Waste water purification system

Also Published As

Publication number Publication date
PT99874A (en) 1993-11-30
NZ241058A (en) 1994-04-27
EP0565534A1 (en) 1993-10-20
IE914305A1 (en) 1992-07-01
AU9037391A (en) 1992-07-22
GB9027688D0 (en) 1991-02-13

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