CA2023302A1 - Apparatus for mechanical purification of liquids - Google Patents
Apparatus for mechanical purification of liquidsInfo
- Publication number
- CA2023302A1 CA2023302A1 CA002023302A CA2023302A CA2023302A1 CA 2023302 A1 CA2023302 A1 CA 2023302A1 CA 002023302 A CA002023302 A CA 002023302A CA 2023302 A CA2023302 A CA 2023302A CA 2023302 A1 CA2023302 A1 CA 2023302A1
- Authority
- CA
- Canada
- Prior art keywords
- carrier
- frames
- filters
- filtering unit
- chamber
- 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.)
- Abandoned
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
- B01D33/15—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
-
- 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
-
- 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
- B01D33/503—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles the backwash arms, shoes acting on the cake side
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Biodiversity & Conservation Biology (AREA)
- Organic Chemistry (AREA)
- Microbiology (AREA)
- Biological Treatment Of Waste Water (AREA)
- Filtration Of Liquid (AREA)
- Surgical Instruments (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
ABSTRACT
Apparatus for mechanical purification of biologically purified waste water has a hollow driven shaft which serves for evacuation of mechanically purified water and carries a battery of disc-shaped annular filtering units. Each unit is assembled of several sector-shaped frames which are surrounded by foraminous filters of textile or other material and admit purified water into the shaft. The latter rotates in a body of waste water in a vessel so that water flows through the filters into the frames and thence into the shaft. The filters intercept impurities which are evacuated by conduits flanking the filtering units and being connected to a suction generating device. The frames are separably connected to the shaft.
Apparatus for mechanical purification of biologically purified waste water has a hollow driven shaft which serves for evacuation of mechanically purified water and carries a battery of disc-shaped annular filtering units. Each unit is assembled of several sector-shaped frames which are surrounded by foraminous filters of textile or other material and admit purified water into the shaft. The latter rotates in a body of waste water in a vessel so that water flows through the filters into the frames and thence into the shaft. The filters intercept impurities which are evacuated by conduits flanking the filtering units and being connected to a suction generating device. The frames are separably connected to the shaft.
Description
2 ~
The apparatus of the present invention constitutes an improvement over and a further development of apparatus which are disclosed in commonly owned U.S. Pat. No. 4,639,315 granted January 27, 1987 to Ernst Fuchs and Karl Fitzi for "Apparatus for mechanical purification of waste water". The disclosure of the patent is incorporated herein by reference.
The invention relates to improvements in apparatus for mechanical purification of liquids, especially for mechanical purification of waste water which has undergone or is about to undergo biological purification. More particularly, the invention relates to improvements in apparatus of the type wherein one or more rotary filtering units have liquid-permeable walls serving to intercept impurities in a liquid which flows through the filters and into the interior of the respective filtering units. Such apparatus are disclosed in the aforementioned commonly owned patent to Fuchs et al.
German Pat. No. 22 61 203 discloses a filtering apparatus which is constructed in such a way that the installation and/or dismantling of its filtering units takes up substantial amounts of time.
Moreover, the patented apparatus is rather complex and comprises a substantial number of parts.
The invention is embodied in an apparatus for mechanical purification of a liquid, particularly waste water which has already undergone or is about to undergo biological purification. The apparatus can be ' ~ ' " ' ::
:''' ' used in conjunction with or can include a vessel for a supply of impurities-containing liquid, a driven rotary tubular carrier which can be removably or permanently installed in the vessel, and at least one hollow annular filtering unit which surrounds and is rotatable with the carrier so that it dips into the supply of liquid in the vessel. The at least one filtering unit includes a plurality of discrete modular frames with means for discharging filtered liquid into the hollow carrier, and liquid-permeable filters which surround the frame and serve to intercept impurities from the liquid which flows from the vessel into the at least one unit and thence into the carrier. The apparatus further comprises means for removing intercepted impurities from the filters. The at least one filtering unit is preferably a hollow disc having first and second substantially radially extending walls which are cons-tituted by the filters. The removing means preferably includes a suction generating device having impurities-collecting conduits which are outwardly adjacent the walls.
In accordance with a presently preferred embodiment of the invention, the carrier has a polygonal cross-sectional outline with a plurality of mutually inclined facets. The at least one filtering unit of such apparatus preferably comprises a discrete frame for each facet of the carrier, and means for separably connecting the frames to the carrier so that each frame has a portion adjacent one of the facets.
Each frame can have a polygonal outline. For example, ,...... .
. , ~ i -.
- ~-,'. ' . ~ .
the carrier can have a hexagonal cross-sectional outline and each frame can constitute a sector having a pentagonal outline. The sectors are connected to the carrier in such a way that the at least one filtering unit has a dodecagonal outline. Alternatively, the at least one filtering unit can have a hexagonal outline, the same as the cross-sectional outline of the carrier;
this can be achieved by assembling the at least one filtering unit of six trapeziform frames, i.e., of six four-sided sector-shaped frames.
The connecting means can comprise means for threadedly connecting the frames to the carrier. For example, the carrier can be provided with at least two outwardly extending bolts for each frame and each frame can comprise sleeves which are slipped onto the respective bolts. The bolts mate with nuts which prevent the sleeves from moving away from the carrier.
The peripheral surface of the at least one filtering unit can be provided with a groove or recess for portions of the filters, and such unit further comprises means for clamping the portions o~ the filters to the frame, e.g., a strip extending into the groove and overlapping the aforementioned portions of the filters. The groove can have a substantially trapeziform cross-sectional outline.
Each frame can comprise first and second liquid-permeable back supports (e.g., in the form of metallic gratings) which are inwardly adjacent the respec-tive walls of the at least one filtering unit.
Each conduit of the removing means can be provided with a plurality of suction chambers including a first chamber nearer to and a second chamber more distant from the carrier. The chambers have impurities discharging outlets and the outlet of the first chamber is preferably larger than the outlet of the second chamber. If each conduit includes three suction chambers with the third chamber located between the respective first and second chambers, the outlet of the third chamber is smaller than the outlet of the respective first chamber but larger than the outlet of the respective second chamber.
Each filter can include a bag which can be slipped onto the respective frame.
The carrier is provided with at least one liquid-admitting opening for each frame, and the aforementioned discharging means of each frame then comprises apertures which communicate with the respective openings.
As a rule, or at least in many instances, the apparatus further comprises at least one additional hollow annular filtering unit which surrounds and is rotatable with the carrier, and means for removing impurities from the filters of the at least one additional filtering unit.
The novel features which are considered as characteristic of the invention are set forth in particular in the appended claims. The improved apparatus itself, however, both as to its construction and its mode of operation, together with additional features and advantages thereof, will be best .
~ ~ ',, ' ~ - ' , ' - ' : ' ' .
' understood upon perusal of the following detailed description of certain presently preferred specific embodiments with reference to the accompanying drawing.
FIG. 1 is a schematic partly elevational and partly vertical sectional view of a purifying apparatus which e~bodies one form of the invention and comprises a battery of six filtering units on a common carrier, the means for removing intercepted impurities being omitted;
FIG. 2 is a vertical sectional view su~stantially as seen in the direction of arrows from the line II-II in FIG. 1 and shows a portion of the device which removes impurities from one wall of one of the filtering units;
FIG. 3 is an enlarged fragmentary sectional view as seen in the di.rection of arrows from the line III-III in FIG. 2 and shows the manner oE separably connecting a frame to the carrier;
FIG. 4 is an enlarged fragmentary sectional view as seen in the direction of arrows from the line IV-IV in FIG. 2 and shows the manner of clamping portions of filters to a frame;
FIG. 5 is an enlarged front elevational view of a pentagonal sector-shaped frame with portions broken away;
FIG. 6 is a sectional view substantially as seen in the direction of arrows from the line VI-VI in FIG. 5;
FIG. 7 is an enlarged fragmentary sectional view su~stantially as seen in the direction of arrows .
;
:: : ^ : , :, - :
~2~
from the line VII-VII in FIG. 5;
FIG. 8 is an enlarged view of a conduit of the removing means;
FIG. 9 is a partly elevational and partly sectional view as seen in the direction of arrows from the line IX-IX in FIG. 8;
FIG. 10 is an end elevational view of a portion of the remo~ing means;
FIG. 11 is an enlarged transverse sectional view as seen in the direction of arrows from the line XI-XI in FIG. 9;
FIG. 12 is a plan view of a plate-like component of the removing means;
FIG. 13 is an enlarged sectional view as seen in the direction of arrows from the line XIII-XIII in FIG. 12; and FIG. 14 is a schematic front elevational view of a four-sided frame which can be used in the filtering units of the improved apparatus.
FIGS. 1 and 2 show an apparatus 1 which comprises or can be installed in a vessel 4 (e.g.~ a tank or basin) confining a supply of impurities-containing biologically purified waste water. The apparatus 1 comprises a hollow rotary horizontal carrier 7 in the form of an elongated shaft having a hexagonal cross-sectional outline with six flat external facets 13. The carrier 7 supports and rotates a battery 2 of six preferably identical annular disc-shaped filtering units 5 which are but need not be equidistant from each other ~as seen in the axial : 7 .
, . .
, ~ ; . : , .
:, , ,, ' ' . . .
~?,3~2 direction of the carrier). The carrier 7 is rotatably mounted in the vessel 4, as at 107, and its right-hand end portion sealingly extends into a housing 108 which separates a clean water outlet 8 from a waste water inlet 3 of the vessel 4. The drive means for the carrier 7 includes a prime mover 9 and a chain transmission including a sprocket wheel lla on the output element of the prime mover, a sprocket wheel 11 on the carrier 7, and an endless chain 10 which is trained over the sprocket wheels 11 and lla.
Each filtering unit 5 has two parallel walls 6 which are made of liquid-permeable filter material and serve to intercept impurities. The mode of operation of the apparatus 1 is as follows: Waste water which contains impurities enters the vessel 4 through the inlet 3 and is drawn into the filtering units 5 through the permeable walls 6. The thus purified water flows from the units 5 into the interior of the hollow carrier 7 and is evacuated by way of the housing 108 (which can contain or can form part of a suction pump) and outlet 8. The prime mover 9 drives the carrier 7 and the battery 2 of filtering units 5 through the medium of the chain 10 and sprocket wheels 11~ lla to move the outer sides of the walls 6 past stationary conduits 23 (one shown in FIG. 2) which form part of a device 24 serving to remove impurities which accumulate on the walls 6. This ensures that the permeability of the walls 6 remains at least substantially constant.
The filtering units 5 together form a composite drum having a hollow shaft (carrier 7) which is rotated to i ~.:
,. ' . ~' . ', ~ . ~
: .,;, . ~ .
~ 3 ~
ensure continuous removal of intercepted impurities as well as to ensure that each and every portion of each wall 6 dips into the supply of liquid in the vessel 4, even if the upper level of such supply is below the topmost portions of the filtering units 5.
In accordance wi-th a feature of the invention, each filtering unit is assembled of six identical modules in the form of pentagonal frames 12 (FIGS. 5 and 6) having liquid-discharging apertures 16 in the form of elongated slots in register with apertures in the respective facets 13 of the carrier 7. The direction of flow of mechanically purified water from the frame 12 of FIG. 5 into the interior of the carrier 7 is indicated by arrow 17. Each facet 13 of the carrier 7 has at least one aperture for each filtering unit 5. The number of such units can be increased or reduced, depending on the desired capacity of the apparatus 1.
Each frame 12 is surrounded by a liquid-permeable filter 20 and each such filter has two panels, one forming part of one of the walls 6 and the ~-other forming part of the other wall 6 of the respective filtering unit 5. Each frame 12 preferably further comprises two liquid-permeable back supports 22 (one shown in FIG. 5) in the form of gratings or lattices which are adjacent the inner sides of the respective filter panels and maintain such panels in two planes which are or can be at least substantially normal to the axis of rotation of the carrier 7. The filters 20 can be made of a textile material or of any g _ : ~ .
~ . , ~, , , .; , J ~ ~ 2 other material which is permeable to liquids but can reliably intercept impurities which are contained in the supply of waste water in the vessel 4.
If the carrier 7 has another polygonal cross-sectional outline (e.g., a pentagonal or octagonal cross-sectional outline), the number of frames 12 in each filtering unit 5 is changed accordingly. It is also possible to employ a hollow tubular carrier which is a cylinder. The narrow inner sides of the frames 12 are then provided with concave external surfaces.
The filters 20 for the frames 12 can constitute prefabricated bags or envelopes so that they can be readily slipped onto or removed from the respective frames 12 in a time saving operation.
The means for separably connecting the frames 12 to the respective facets 13 of the carrier 7 comprises elongated externally threaded bolts 15 which extend radially of the carrier and are arranged in pairs, one pair per frame. The connecting means further comprises sleeves 14 which are provided in the frames 12 and can be slipped onto or off the respective pairs of bolts 15. The outer end portions of the bolts 15 receive nuts 115 which hold the sleeves 14 (and hence the frames 12) against movement away from the carrier 7 and maintain the inner sides of the frames in requisite sealing engagement with the respective facets 13.
The two outer sides of each frame 12 have grooves or recesses 18 ~shown in FIGS. 3, 4 and 6) each ~ :
: ~. , : - , , . ~
:
~, ~J~
of which has a trapeziform cross-sectional outline and which serve to receive a strip 19 serving to clamp por-tions of the filters 20 to the respective frames 12.
The grooves or recesses 18 of all six frames 12 forming part of a filtering unit 5 can together form a circumferentially complete dodecagonal groove which can receive a single strip 19 or two or more discrete strips. The strip or strips 19 can be caused to bear against the adjacent portions of filters 20 under the action of the bolts 15 and nuts 115. To this end, the passages of the sleeves 19 communicate with the groove 18 so that the bolts 15 of the carrier 7 can --xtend through and beyond the respective sleeves and through and beyond suitable holes in the strip or strips 19 to be engaged by the respective nuts 115 which urge the strip or strips against the adjacent portions of ~-filters 20 in the groove 18.
In addition to or in lieu of using the bolts 15 and nuts 115 as a means for securing the strip or strips 19 in the recess or groove 18, the frames 12 can be provided with internally threaded sleeves 21 (see FIGS. 4, 5 and 7) which can receive the shanks of screws (not shown) serving to urge the strip or strips 19 against the adjacent portions of filters 20 in the groove 18.
The back supports 22 are optional but desirable and advantageous because they maintain the panels of the filters 20 in optimum positions for removal of intercepted impurities by the respective suction conduits 23.
. ., : :
..
, .
~J.~3 The details of a presently preferred conduit 23 are shown in FIGS. 8 to 11. This conduit extends substantially radially of the carrier 7 and is outwardly adjacent the respective wall 6 of the filteri.ng unit 5. One such conduit is provided for each wall 6 of each filtering unit 5, i.e., the removing means of the apparatus 1 which is shown in FIGS. 1 and 2 will employ a total of twelve conduits 23.
That side of the conduit 23 which is adjacent the outer side of the respective wall 6 is open and the conduit is formed with a total of three suction chambers 25, 26, 27. Due to different peripheral speeds of different portions of the wall 6 (as measured radially of the carrier 7), the radially innermost chamber 25 has a relatively large impuritles-evacuating outlet 28, the median chamber 26 has a smaller outlet 29 and the radially outermost chamber 27 has the smallest outlet 30. The outlets 28-30 admit impurities into a pipe 123 which is connected to a suction generating component of the removing device 24. Such dimensioning ensures that the sizes of the outlets 28-30 are proportional to the quanti-ties of impurities which enter the respective suction chambers 25 -to 27.
The plate-like member 31 which is shown in FIGS. 12 and 13 overlies the open sides of the suction chambers 25 to 27, i.e., such plate is adjacent the respective wall 6.
FIG. 14 shows a four-sided (trapeziform) frame 12' which can be used (with five additional frames 12') :: ~ : , . , . :. ~ :: .
in lieu of six frames 12 to form part of an annular filtering unit having a hexagonal outline, i.e., the same as the cross-sectional outline of the carrier 7 if the latter is used jointly with six frames 12' of the type shown in FIG. 14.
The improved apparatus can be modified in a number of additional ways without departing from the spirit of the invention. Thus, the carrier 7 can have a polygonal cross-sectional outline with more or less than six facets, the configuration of the frames can depart from the configuration of the frames 12 or of the frame 12', the drive means for the carrier need not comprise a chain transmission and the number of filtering units 5 can be increased or reduced, depending on the desired capacity of the apparatus.
An important advantage of the improved apparatus is that each of the frames 12 or 12' can be disconnected from or reconnected to the carrier 7 independently of the other frame or frames. This holds especially true if the strip 19 is assembled of several sections, one for each frame 12 or 12', i.e., if each frame can be disconnected from the carrier together with the corresponding section of the strip.
Another important advantage of the improved apparatus is that a large number of relatively thin filtering units 5 can be placed close or very close to each other so as to ensure that the apparatus can process large quantities of waste water or another liquid per unit of time. The removing device 24 has been found to be efficient and capable of removing , , -~ ,: , ., , , " , - ,. -:
". " ': :", , : ' :
~z~3~$2 large quantities of intercepted impurities. The two conduits 23 which are located between two neighboring units 5 are preferably staggered relative to each other in the circumferential direction of the carrier 7 to thus ensure that the space requirements of these two conduits (in the axial direction of the carrier 7) do not exceed those of a single conduit.
:- . .: ~ . . . : ~ .
The apparatus of the present invention constitutes an improvement over and a further development of apparatus which are disclosed in commonly owned U.S. Pat. No. 4,639,315 granted January 27, 1987 to Ernst Fuchs and Karl Fitzi for "Apparatus for mechanical purification of waste water". The disclosure of the patent is incorporated herein by reference.
The invention relates to improvements in apparatus for mechanical purification of liquids, especially for mechanical purification of waste water which has undergone or is about to undergo biological purification. More particularly, the invention relates to improvements in apparatus of the type wherein one or more rotary filtering units have liquid-permeable walls serving to intercept impurities in a liquid which flows through the filters and into the interior of the respective filtering units. Such apparatus are disclosed in the aforementioned commonly owned patent to Fuchs et al.
German Pat. No. 22 61 203 discloses a filtering apparatus which is constructed in such a way that the installation and/or dismantling of its filtering units takes up substantial amounts of time.
Moreover, the patented apparatus is rather complex and comprises a substantial number of parts.
The invention is embodied in an apparatus for mechanical purification of a liquid, particularly waste water which has already undergone or is about to undergo biological purification. The apparatus can be ' ~ ' " ' ::
:''' ' used in conjunction with or can include a vessel for a supply of impurities-containing liquid, a driven rotary tubular carrier which can be removably or permanently installed in the vessel, and at least one hollow annular filtering unit which surrounds and is rotatable with the carrier so that it dips into the supply of liquid in the vessel. The at least one filtering unit includes a plurality of discrete modular frames with means for discharging filtered liquid into the hollow carrier, and liquid-permeable filters which surround the frame and serve to intercept impurities from the liquid which flows from the vessel into the at least one unit and thence into the carrier. The apparatus further comprises means for removing intercepted impurities from the filters. The at least one filtering unit is preferably a hollow disc having first and second substantially radially extending walls which are cons-tituted by the filters. The removing means preferably includes a suction generating device having impurities-collecting conduits which are outwardly adjacent the walls.
In accordance with a presently preferred embodiment of the invention, the carrier has a polygonal cross-sectional outline with a plurality of mutually inclined facets. The at least one filtering unit of such apparatus preferably comprises a discrete frame for each facet of the carrier, and means for separably connecting the frames to the carrier so that each frame has a portion adjacent one of the facets.
Each frame can have a polygonal outline. For example, ,...... .
. , ~ i -.
- ~-,'. ' . ~ .
the carrier can have a hexagonal cross-sectional outline and each frame can constitute a sector having a pentagonal outline. The sectors are connected to the carrier in such a way that the at least one filtering unit has a dodecagonal outline. Alternatively, the at least one filtering unit can have a hexagonal outline, the same as the cross-sectional outline of the carrier;
this can be achieved by assembling the at least one filtering unit of six trapeziform frames, i.e., of six four-sided sector-shaped frames.
The connecting means can comprise means for threadedly connecting the frames to the carrier. For example, the carrier can be provided with at least two outwardly extending bolts for each frame and each frame can comprise sleeves which are slipped onto the respective bolts. The bolts mate with nuts which prevent the sleeves from moving away from the carrier.
The peripheral surface of the at least one filtering unit can be provided with a groove or recess for portions of the filters, and such unit further comprises means for clamping the portions o~ the filters to the frame, e.g., a strip extending into the groove and overlapping the aforementioned portions of the filters. The groove can have a substantially trapeziform cross-sectional outline.
Each frame can comprise first and second liquid-permeable back supports (e.g., in the form of metallic gratings) which are inwardly adjacent the respec-tive walls of the at least one filtering unit.
Each conduit of the removing means can be provided with a plurality of suction chambers including a first chamber nearer to and a second chamber more distant from the carrier. The chambers have impurities discharging outlets and the outlet of the first chamber is preferably larger than the outlet of the second chamber. If each conduit includes three suction chambers with the third chamber located between the respective first and second chambers, the outlet of the third chamber is smaller than the outlet of the respective first chamber but larger than the outlet of the respective second chamber.
Each filter can include a bag which can be slipped onto the respective frame.
The carrier is provided with at least one liquid-admitting opening for each frame, and the aforementioned discharging means of each frame then comprises apertures which communicate with the respective openings.
As a rule, or at least in many instances, the apparatus further comprises at least one additional hollow annular filtering unit which surrounds and is rotatable with the carrier, and means for removing impurities from the filters of the at least one additional filtering unit.
The novel features which are considered as characteristic of the invention are set forth in particular in the appended claims. The improved apparatus itself, however, both as to its construction and its mode of operation, together with additional features and advantages thereof, will be best .
~ ~ ',, ' ~ - ' , ' - ' : ' ' .
' understood upon perusal of the following detailed description of certain presently preferred specific embodiments with reference to the accompanying drawing.
FIG. 1 is a schematic partly elevational and partly vertical sectional view of a purifying apparatus which e~bodies one form of the invention and comprises a battery of six filtering units on a common carrier, the means for removing intercepted impurities being omitted;
FIG. 2 is a vertical sectional view su~stantially as seen in the direction of arrows from the line II-II in FIG. 1 and shows a portion of the device which removes impurities from one wall of one of the filtering units;
FIG. 3 is an enlarged fragmentary sectional view as seen in the di.rection of arrows from the line III-III in FIG. 2 and shows the manner oE separably connecting a frame to the carrier;
FIG. 4 is an enlarged fragmentary sectional view as seen in the direction of arrows from the line IV-IV in FIG. 2 and shows the manner of clamping portions of filters to a frame;
FIG. 5 is an enlarged front elevational view of a pentagonal sector-shaped frame with portions broken away;
FIG. 6 is a sectional view substantially as seen in the direction of arrows from the line VI-VI in FIG. 5;
FIG. 7 is an enlarged fragmentary sectional view su~stantially as seen in the direction of arrows .
;
:: : ^ : , :, - :
~2~
from the line VII-VII in FIG. 5;
FIG. 8 is an enlarged view of a conduit of the removing means;
FIG. 9 is a partly elevational and partly sectional view as seen in the direction of arrows from the line IX-IX in FIG. 8;
FIG. 10 is an end elevational view of a portion of the remo~ing means;
FIG. 11 is an enlarged transverse sectional view as seen in the direction of arrows from the line XI-XI in FIG. 9;
FIG. 12 is a plan view of a plate-like component of the removing means;
FIG. 13 is an enlarged sectional view as seen in the direction of arrows from the line XIII-XIII in FIG. 12; and FIG. 14 is a schematic front elevational view of a four-sided frame which can be used in the filtering units of the improved apparatus.
FIGS. 1 and 2 show an apparatus 1 which comprises or can be installed in a vessel 4 (e.g.~ a tank or basin) confining a supply of impurities-containing biologically purified waste water. The apparatus 1 comprises a hollow rotary horizontal carrier 7 in the form of an elongated shaft having a hexagonal cross-sectional outline with six flat external facets 13. The carrier 7 supports and rotates a battery 2 of six preferably identical annular disc-shaped filtering units 5 which are but need not be equidistant from each other ~as seen in the axial : 7 .
, . .
, ~ ; . : , .
:, , ,, ' ' . . .
~?,3~2 direction of the carrier). The carrier 7 is rotatably mounted in the vessel 4, as at 107, and its right-hand end portion sealingly extends into a housing 108 which separates a clean water outlet 8 from a waste water inlet 3 of the vessel 4. The drive means for the carrier 7 includes a prime mover 9 and a chain transmission including a sprocket wheel lla on the output element of the prime mover, a sprocket wheel 11 on the carrier 7, and an endless chain 10 which is trained over the sprocket wheels 11 and lla.
Each filtering unit 5 has two parallel walls 6 which are made of liquid-permeable filter material and serve to intercept impurities. The mode of operation of the apparatus 1 is as follows: Waste water which contains impurities enters the vessel 4 through the inlet 3 and is drawn into the filtering units 5 through the permeable walls 6. The thus purified water flows from the units 5 into the interior of the hollow carrier 7 and is evacuated by way of the housing 108 (which can contain or can form part of a suction pump) and outlet 8. The prime mover 9 drives the carrier 7 and the battery 2 of filtering units 5 through the medium of the chain 10 and sprocket wheels 11~ lla to move the outer sides of the walls 6 past stationary conduits 23 (one shown in FIG. 2) which form part of a device 24 serving to remove impurities which accumulate on the walls 6. This ensures that the permeability of the walls 6 remains at least substantially constant.
The filtering units 5 together form a composite drum having a hollow shaft (carrier 7) which is rotated to i ~.:
,. ' . ~' . ', ~ . ~
: .,;, . ~ .
~ 3 ~
ensure continuous removal of intercepted impurities as well as to ensure that each and every portion of each wall 6 dips into the supply of liquid in the vessel 4, even if the upper level of such supply is below the topmost portions of the filtering units 5.
In accordance wi-th a feature of the invention, each filtering unit is assembled of six identical modules in the form of pentagonal frames 12 (FIGS. 5 and 6) having liquid-discharging apertures 16 in the form of elongated slots in register with apertures in the respective facets 13 of the carrier 7. The direction of flow of mechanically purified water from the frame 12 of FIG. 5 into the interior of the carrier 7 is indicated by arrow 17. Each facet 13 of the carrier 7 has at least one aperture for each filtering unit 5. The number of such units can be increased or reduced, depending on the desired capacity of the apparatus 1.
Each frame 12 is surrounded by a liquid-permeable filter 20 and each such filter has two panels, one forming part of one of the walls 6 and the ~-other forming part of the other wall 6 of the respective filtering unit 5. Each frame 12 preferably further comprises two liquid-permeable back supports 22 (one shown in FIG. 5) in the form of gratings or lattices which are adjacent the inner sides of the respective filter panels and maintain such panels in two planes which are or can be at least substantially normal to the axis of rotation of the carrier 7. The filters 20 can be made of a textile material or of any g _ : ~ .
~ . , ~, , , .; , J ~ ~ 2 other material which is permeable to liquids but can reliably intercept impurities which are contained in the supply of waste water in the vessel 4.
If the carrier 7 has another polygonal cross-sectional outline (e.g., a pentagonal or octagonal cross-sectional outline), the number of frames 12 in each filtering unit 5 is changed accordingly. It is also possible to employ a hollow tubular carrier which is a cylinder. The narrow inner sides of the frames 12 are then provided with concave external surfaces.
The filters 20 for the frames 12 can constitute prefabricated bags or envelopes so that they can be readily slipped onto or removed from the respective frames 12 in a time saving operation.
The means for separably connecting the frames 12 to the respective facets 13 of the carrier 7 comprises elongated externally threaded bolts 15 which extend radially of the carrier and are arranged in pairs, one pair per frame. The connecting means further comprises sleeves 14 which are provided in the frames 12 and can be slipped onto or off the respective pairs of bolts 15. The outer end portions of the bolts 15 receive nuts 115 which hold the sleeves 14 (and hence the frames 12) against movement away from the carrier 7 and maintain the inner sides of the frames in requisite sealing engagement with the respective facets 13.
The two outer sides of each frame 12 have grooves or recesses 18 ~shown in FIGS. 3, 4 and 6) each ~ :
: ~. , : - , , . ~
:
~, ~J~
of which has a trapeziform cross-sectional outline and which serve to receive a strip 19 serving to clamp por-tions of the filters 20 to the respective frames 12.
The grooves or recesses 18 of all six frames 12 forming part of a filtering unit 5 can together form a circumferentially complete dodecagonal groove which can receive a single strip 19 or two or more discrete strips. The strip or strips 19 can be caused to bear against the adjacent portions of filters 20 under the action of the bolts 15 and nuts 115. To this end, the passages of the sleeves 19 communicate with the groove 18 so that the bolts 15 of the carrier 7 can --xtend through and beyond the respective sleeves and through and beyond suitable holes in the strip or strips 19 to be engaged by the respective nuts 115 which urge the strip or strips against the adjacent portions of ~-filters 20 in the groove 18.
In addition to or in lieu of using the bolts 15 and nuts 115 as a means for securing the strip or strips 19 in the recess or groove 18, the frames 12 can be provided with internally threaded sleeves 21 (see FIGS. 4, 5 and 7) which can receive the shanks of screws (not shown) serving to urge the strip or strips 19 against the adjacent portions of filters 20 in the groove 18.
The back supports 22 are optional but desirable and advantageous because they maintain the panels of the filters 20 in optimum positions for removal of intercepted impurities by the respective suction conduits 23.
. ., : :
..
, .
~J.~3 The details of a presently preferred conduit 23 are shown in FIGS. 8 to 11. This conduit extends substantially radially of the carrier 7 and is outwardly adjacent the respective wall 6 of the filteri.ng unit 5. One such conduit is provided for each wall 6 of each filtering unit 5, i.e., the removing means of the apparatus 1 which is shown in FIGS. 1 and 2 will employ a total of twelve conduits 23.
That side of the conduit 23 which is adjacent the outer side of the respective wall 6 is open and the conduit is formed with a total of three suction chambers 25, 26, 27. Due to different peripheral speeds of different portions of the wall 6 (as measured radially of the carrier 7), the radially innermost chamber 25 has a relatively large impuritles-evacuating outlet 28, the median chamber 26 has a smaller outlet 29 and the radially outermost chamber 27 has the smallest outlet 30. The outlets 28-30 admit impurities into a pipe 123 which is connected to a suction generating component of the removing device 24. Such dimensioning ensures that the sizes of the outlets 28-30 are proportional to the quanti-ties of impurities which enter the respective suction chambers 25 -to 27.
The plate-like member 31 which is shown in FIGS. 12 and 13 overlies the open sides of the suction chambers 25 to 27, i.e., such plate is adjacent the respective wall 6.
FIG. 14 shows a four-sided (trapeziform) frame 12' which can be used (with five additional frames 12') :: ~ : , . , . :. ~ :: .
in lieu of six frames 12 to form part of an annular filtering unit having a hexagonal outline, i.e., the same as the cross-sectional outline of the carrier 7 if the latter is used jointly with six frames 12' of the type shown in FIG. 14.
The improved apparatus can be modified in a number of additional ways without departing from the spirit of the invention. Thus, the carrier 7 can have a polygonal cross-sectional outline with more or less than six facets, the configuration of the frames can depart from the configuration of the frames 12 or of the frame 12', the drive means for the carrier need not comprise a chain transmission and the number of filtering units 5 can be increased or reduced, depending on the desired capacity of the apparatus.
An important advantage of the improved apparatus is that each of the frames 12 or 12' can be disconnected from or reconnected to the carrier 7 independently of the other frame or frames. This holds especially true if the strip 19 is assembled of several sections, one for each frame 12 or 12', i.e., if each frame can be disconnected from the carrier together with the corresponding section of the strip.
Another important advantage of the improved apparatus is that a large number of relatively thin filtering units 5 can be placed close or very close to each other so as to ensure that the apparatus can process large quantities of waste water or another liquid per unit of time. The removing device 24 has been found to be efficient and capable of removing , , -~ ,: , ., , , " , - ,. -:
". " ': :", , : ' :
~z~3~$2 large quantities of intercepted impurities. The two conduits 23 which are located between two neighboring units 5 are preferably staggered relative to each other in the circumferential direction of the carrier 7 to thus ensure that the space requirements of these two conduits (in the axial direction of the carrier 7) do not exceed those of a single conduit.
:- . .: ~ . . . : ~ .
Claims (18)
1. Apparatus for mechanical purification of a liquid, particularly waste water which has undergone biological purification, comprising a vessel for a supply of impurities-containing liquid; a driven rotary tubular carrier in said vessel; at least one hollow annular filtering unit surrounding and rotatable with said carrier, said at least one unit including a plurality of discrete frames with means for discharging filtered liquid into said carrier and liquid-permeable filters surrounding said frames and arranged to intercept impurities from liquid which flows from the vessel into said at least one unit and thence into said carrier; and means for removing intercepted impurities from said filters.
2. The apparatus of claim 1, wherein said at least one filtering unit is a disc having first and second substantially radially extending walls constituted by said filters, said removing means including a suction generating device having impurities-collecting conduits outwardly adjacent said walls.
3. The apparatus of claim 2, wherein said carrier has a polygonal cross-sectional outline and includes a plurality of mutually inclined facets, said at least one filtering unit having a frame for each of said facets.
4. The apparatus of claim 3, further comprising means for separably connecting said frames to said carrier so that each frame has a portion adjacent one of said facets.
5. The apparatus of claim 4, wherein each of said frames has a polygonal outline.
6. The apparatus of claim 5, wherein said carrier has a hexagonal cross-sectional outline and each of said frames is a sector having a pentagonal outline, said at least one filtering unit having a dodecagonal outline.
7. The apparatus of claim 5, wherein said carrier has a hexagonal cross-sectional outline and said at least one filtering unit has a hexagonal outline, each of said frames constituting a four-sided sector.
8. The apparatus of claim 4, wherein said connecting means comprises means for threadedly connecting said frames to said carrier.
9. The apparatus of claim 8, wherein said connecting means comprises a plurality of bolts extending from said carrier for each of said frames, sleeves provided in said frames and surrounding the respective bolts, and nuts provided on said bolts to hold the sleeves against movement away from said carrier.
10. The apparatus of claim 2, wherein said at least one filtering unit has a peripheral surface with a groove, said filters having portions in said groove and said at least one filtering unit further comprising means for clamping said portions of said filters to said frames.
11. The apparatus of claim 10, wherein said groove has a substantially trapeziform cross-sectional outline and said clamping means comprises a strip overlying said portions of said filters in said groove.
12. The apparatus of claim 2, wherein each of said frames comprises first and second liquid-permeable back supports inwardly adjacent the respective walls.
13. The apparatus of claim 12, wherein said back supports include gratings.
14. The apparatus of claim 2, wherein each of said conduits has a plurality of suction chambers including a first chamber nearer to and a second chamber more distant from said carrier, said chambers having impurities-discharging outlets adjacent the respective walls, the outlet of said first chamber being larger than the outlet of said second chamber.
15. The apparatus of claim 14, wherein each of said conduits further comprises a third chamber between the respective first and second chambers, each third chamber having an outlet greater than the outlet of the respective second chamber and smaller than the outlet of the respective first chamber.
16. The apparatus of claim 1, wherein each of said filters includes a bag which at least partially surrounds the respective frame.
17. The apparatus of claim 1, wherein said carrier has at least one liquid-admitting opening for each of said frames and said discharging means have apertures communicating with the respective openings.
18. The apparatus of claim 1, further comprising at least one additional hollow annular filtering unit surrounding and rotatable with said carrier, and means for removing intercepted impurities from the filters of said at least one additional filtering unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3926962 | 1989-08-16 | ||
| DE3926962A DE3926962A1 (en) | 1989-08-16 | 1989-08-16 | DEVICE FOR MECHANICAL CLEANING OF BIOLOGICALLY TREATED WASTE WATER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2023302A1 true CA2023302A1 (en) | 1991-02-17 |
Family
ID=6387177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002023302A Abandoned CA2023302A1 (en) | 1989-08-16 | 1990-08-15 | Apparatus for mechanical purification of liquids |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0413178B1 (en) |
| JP (1) | JPH03221106A (en) |
| KR (1) | KR970010590B1 (en) |
| AT (1) | ATE103196T1 (en) |
| AU (1) | AU6102090A (en) |
| CA (1) | CA2023302A1 (en) |
| DE (2) | DE3926962A1 (en) |
| DK (1) | DK0413178T3 (en) |
| ES (1) | ES2050896T3 (en) |
| HK (1) | HK36296A (en) |
| NO (1) | NO175408C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8801929B2 (en) | 2007-07-18 | 2014-08-12 | Evoqua Water Technologies Llc | Trash tolerant filter support for a disc filter |
| US8808542B2 (en) | 2007-07-18 | 2014-08-19 | Evoqua Water Technologies Llc | Disc filter |
| US8852445B2 (en) | 2011-10-28 | 2014-10-07 | Alfa Laval Ashbrook Simon-Hartley, Inc | Methods and apparatus for treating water and wastewater employing a cloth disk filter |
| US9028692B2 (en) | 2006-08-14 | 2015-05-12 | Evoqua Water Technologies Llc | High flow disc filter |
| US10857491B2 (en) | 2014-06-05 | 2020-12-08 | Evoqua Water Technologies Llc | Filtering panel and method of making the same |
| US10888807B2 (en) | 2016-08-12 | 2021-01-12 | Evoqua Water Technologies Llc | Disc filter pre-screen dual media disc filter |
| US10905981B2 (en) | 2011-10-28 | 2021-02-02 | Alfa Laval Corporate Ab | Methods and apparatus for treating water and wastewater employing a cloth filter |
| US11529573B2 (en) | 2019-04-23 | 2022-12-20 | Greatpyr Resources Llc | Systems and processes employing wet/dry suction filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2608815B2 (en) * | 1991-07-01 | 1997-05-14 | 武司 保谷 | Concentrator |
| DE19537578A1 (en) * | 1995-10-09 | 1997-04-10 | Passavant Werke | Waste water filter assembly screens operate in parallel within single main chamber |
| DE19624483A1 (en) * | 1996-06-19 | 1998-01-02 | Mecana Umwelttechnik Ag | Filter cloth, filtering method and filtering device for liquid filtration |
| US6110374A (en) * | 1998-06-30 | 2000-08-29 | Aqua-Aerobic Systems, Inc. | Treatment process for removing microbial contaminants suspended in wastewater |
| KR20020084663A (en) * | 2001-05-04 | 2002-11-09 | 조대형 | Auto clean filter |
| FI123047B (en) * | 2011-04-29 | 2012-10-15 | Metso Paper Inc | Wheel filter shaft |
| ITVI20120190A1 (en) * | 2012-07-30 | 2014-01-31 | Nuove En S R L | MACHINE FOR CONTINUOUS MICROFILTRATION OF PROCESS AND DISCHARGE WATERS REUSABLE IN AGRICULTURE AND INDUSTRY |
| JP6158581B2 (en) * | 2013-04-30 | 2017-07-05 | 富士フィルター工業株式会社 | Filtration device |
| KR102183820B1 (en) * | 2020-03-10 | 2020-11-30 | 주식회사 그레넥스 | Back wash device for fabric filtration apparatus |
| DE102020117493A1 (en) | 2020-07-02 | 2022-01-05 | Huber Se | Rotating disk filter |
| DE102020126133A1 (en) | 2020-10-06 | 2022-04-07 | Mecana Umwelttechnik Gmbh | Suction device for a disc filter and method for filtering liquids with a disc filter |
| DE102022110830A1 (en) | 2022-05-03 | 2023-11-09 | Huber Se | Filter bag and filter module for a rotating disk filter and rotating disk filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE568537C (en) * | 1928-12-05 | 1933-01-21 | Oliver United Filters Inc | Rotary filter |
| FR787265A (en) * | 1934-06-16 | 1935-09-19 | Alsacienne Constr Meca | Improvement in rotary disc filters |
| US2591720A (en) * | 1947-12-26 | 1952-04-08 | Peterson Filters & Eng | Rotary leaf filter unit |
| US3080064A (en) * | 1959-08-14 | 1963-03-05 | Ametek Inc | Filter scraper |
| GB1009952A (en) * | 1962-05-17 | 1965-11-17 | Simonacco Ltd | Improvements in and relating to rotary disc filters |
| US3331512A (en) * | 1965-06-01 | 1967-07-18 | Improved Machinery Inc | Filter screen |
| DE2002858A1 (en) * | 1970-01-22 | 1971-07-29 | Union Supply Company | Disc filter apparatus |
| GB1401772A (en) * | 1971-11-18 | 1975-07-30 | Simonacco Ltd | Filters |
| JPS4887469A (en) * | 1972-02-19 | 1973-11-17 | ||
| JPS5312814A (en) * | 1976-07-19 | 1978-02-04 | Shin Etsu Chem Co Ltd | Preparation of 2-cyanoethyltrichlorosilane |
| US4169794A (en) * | 1977-03-02 | 1979-10-02 | Joy Manufacturing Company | Filter |
| US4174681A (en) * | 1977-07-18 | 1979-11-20 | The Bendix Corporation | Two-group/simultaneous full injection conversion system for multiple cylinder engines |
| DE3438170A1 (en) * | 1984-10-18 | 1986-04-24 | Mecapec S.A., Schmerikon | SYSTEM FOR MECHANICAL WASTE WATER TREATMENT |
-
1989
- 1989-08-16 DE DE3926962A patent/DE3926962A1/en active Granted
-
1990
- 1990-07-26 ES ES90114329T patent/ES2050896T3/en not_active Expired - Lifetime
- 1990-07-26 DE DE90114329T patent/DE59005073D1/en not_active Expired - Fee Related
- 1990-07-26 DK DK90114329.7T patent/DK0413178T3/en active
- 1990-07-26 AT AT90114329T patent/ATE103196T1/en not_active IP Right Cessation
- 1990-07-26 EP EP90114329A patent/EP0413178B1/en not_active Expired - Lifetime
- 1990-08-10 KR KR1019900012320A patent/KR970010590B1/en not_active IP Right Cessation
- 1990-08-15 JP JP2214465A patent/JPH03221106A/en active Pending
- 1990-08-15 CA CA002023302A patent/CA2023302A1/en not_active Abandoned
- 1990-08-15 AU AU61020/90A patent/AU6102090A/en not_active Abandoned
- 1990-08-15 NO NO903586A patent/NO175408C/en unknown
-
1996
- 1996-02-29 HK HK36296A patent/HK36296A/en not_active IP Right Cessation
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9028692B2 (en) | 2006-08-14 | 2015-05-12 | Evoqua Water Technologies Llc | High flow disc filter |
| US10207210B2 (en) | 2006-08-14 | 2019-02-19 | Evoqua Water Technologies Llc | High flow disc filter |
| US9023208B2 (en) | 2007-07-18 | 2015-05-05 | Evoqua Water Technologies Llc | Disc filter |
| US8801929B2 (en) | 2007-07-18 | 2014-08-12 | Evoqua Water Technologies Llc | Trash tolerant filter support for a disc filter |
| US9339745B2 (en) | 2007-07-18 | 2016-05-17 | Evoqua Water Technologies Llc | Trash tolerant filter support for a disc filter |
| US8808542B2 (en) | 2007-07-18 | 2014-08-19 | Evoqua Water Technologies Llc | Disc filter |
| US8852445B2 (en) | 2011-10-28 | 2014-10-07 | Alfa Laval Ashbrook Simon-Hartley, Inc | Methods and apparatus for treating water and wastewater employing a cloth disk filter |
| US10905981B2 (en) | 2011-10-28 | 2021-02-02 | Alfa Laval Corporate Ab | Methods and apparatus for treating water and wastewater employing a cloth filter |
| US10857491B2 (en) | 2014-06-05 | 2020-12-08 | Evoqua Water Technologies Llc | Filtering panel and method of making the same |
| US11660552B2 (en) | 2014-06-05 | 2023-05-30 | Evoqua Water Technologies Llc | Filtering panel and method of making the same |
| US10888807B2 (en) | 2016-08-12 | 2021-01-12 | Evoqua Water Technologies Llc | Disc filter pre-screen dual media disc filter |
| US12048890B2 (en) | 2016-08-12 | 2024-07-30 | Evoqua Water Technologies Llc | Disc filter pre-screen dual media disc filter |
| US11529573B2 (en) | 2019-04-23 | 2022-12-20 | Greatpyr Resources Llc | Systems and processes employing wet/dry suction filter |
| US12090428B2 (en) | 2019-04-23 | 2024-09-17 | Greatpyr Resources Llc | Systems and processes employing wet/dry suction filter |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59005073D1 (en) | 1994-04-28 |
| ES2050896T3 (en) | 1994-06-01 |
| NO175408C (en) | 1994-10-12 |
| JPH03221106A (en) | 1991-09-30 |
| KR970010590B1 (en) | 1997-06-28 |
| HK36296A (en) | 1996-03-08 |
| DK0413178T3 (en) | 1994-07-18 |
| EP0413178A2 (en) | 1991-02-20 |
| NO903586D0 (en) | 1990-08-15 |
| DE3926962C2 (en) | 1992-01-09 |
| DE3926962A1 (en) | 1991-02-21 |
| NO903586L (en) | 1991-02-18 |
| ATE103196T1 (en) | 1994-04-15 |
| KR910004478A (en) | 1991-03-28 |
| EP0413178B1 (en) | 1994-03-23 |
| AU6102090A (en) | 1991-02-21 |
| NO175408B (en) | 1994-07-04 |
| EP0413178A3 (en) | 1991-06-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |