CA2179449A1 - Biofilter - Google Patents
BiofilterInfo
- Publication number
- CA2179449A1 CA2179449A1 CA 2179449 CA2179449A CA2179449A1 CA 2179449 A1 CA2179449 A1 CA 2179449A1 CA 2179449 CA2179449 CA 2179449 CA 2179449 A CA2179449 A CA 2179449A CA 2179449 A1 CA2179449 A1 CA 2179449A1
- Authority
- CA
- Canada
- Prior art keywords
- reactor vessel
- vessel according
- filter
- filter elements
- plastic
- 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
Abstract
A biofilter has a plurality of filter elements each of which has a filter medium of fragmented plastic, preferably waste plastic. The fragmented plastic has an inherent curvature to maintain adjacent surfaces of the fragmented plastic in spaced relationship. The filter elements are arranged in filter modules in series with the effluent flow with the longitudinal axes of filter elements of adjacent filter modules disposed orthogonally.
Description
21~4~
.
RTnl;'IT.'l'r The present invention relates to a filter for use in the biological treatment of water in both aerobic 5 and anaerobic conditions.
The oldest well-known biofilters applied widely in water treatment include biof ilters made of natural materials, such a6 sand, gravel, or properly granulated basalt or granite stones . Biof ilters have also been 10 filled with other natural materials, such as blast-furnace coke or slag.
Another form of biofilter i5 a biochemical reactor, in which biologically active material is situated upon a spatially developed filter medium. These 15 have also been used in water treatment. In one ~mho~ nt a filter medium is made of porous blocks of thin shaped plastic boards glued together. The blocks, placed in layers on a grid within the biochemical reactor (biofilter) serve as a base for a layer of micro-20 organisms which take part in d~ ition and synthesisof chemical compounds.
Other extensively used biofilters are filled with rings, balls or other g~ ~L ically shaped elements made of ceramic materials or plastic . Floating f ibres, 25 coils, tapes and nets made of plastic have also been used as biofilter fillings.
The previously known biof ilters, as a result of the growth of microorganisms and biodegradation, become excessively polluted and have to be cleaned or replaced 30 after a specific period of time. This task is difficult and expensive, and requires a temporal shut-down of the water treatment plant.
Water treatment plants have been usually built as stationary units with biofilters of specific, 35 invariable dimensions. This narrows the possibility to choose a water treatment plant according to the speciric needs of recipients. Such water treatment plants are generally lln~ cal as far as their size and adjustment to individual needs are concerned.
217~4~9 , It i8 therefore an object of the present invention to provide a filter that obviates or mitigates the above disadvantages.
In general terms, the present invention 5 provides a filter that includes filter elements formed from non-oriented plastic strips made of r~, ~ed, preferably cut, waste plastic products with a surface which constitutes a base for a layer of micro-organisms.
The strips are used as a f illing that is located within 10 flexible inelastic sleeves that may be flexed to adapt to a cuboidal, preferably cubic configuration. A filter can contain any number of such identical f ilter elements a~sembled into modules that form a stiff, light-weight structure .
It has been found that the plastic strips may readily provide a surface area of between 60 ft2 and 90 ft2 for each 1 ft3 of filter to permit effective aerobic or anaerobic operation.
In the preferred ~mhQrlir~-lt of the invention, 20 the utilization of fragmented waste plastic products reduces the production costs of the biofilter, and at the same time, if such biological reactors are widely used, it will help protect the natural environment through plastic waste disposal. Placing the filter elements in 25 modules permits the construction of biofilters suitable in siÆe to the amount of f iltered water . This enables one to choose the dimensions of a water treatment plant according to individual requirements.
A biof ilter built of modules as described in 3o the preferred ~mhorlil lt can serve as a submerged ("wet") or washed ("dry") biofilter and can be used in both aerobic and anaerobic treatment methods. This arrangement also facilitates construction from separate containers that can be easily replaced when, due to the 35 growth of micro-organisms on the specific surface and biodegradation, they become excessively polluted.
.
The construction of a biof ilter according to the preferred ~ t requires relatively small illVeDi --L and provides low operating costs of treatment plants .
An ~ nt of the invention will now be described by way of example only with reference to the ;lr -nying drawings, in which:
Figure 1 is a schematic representation of a waste water treatment system;
Figure 2 is a perspective view of a portion of a biofilter used in the system of Figure l;
Figure 3 is a side view of a frame used in the biof ilter of Figure 2;
Figure 4 is a view on the line 4-4 of Figure 3;
Figures 5a and 5b show the assembly of the biofilter utilizing the frame of Figure 3;
Figure 6 is an end view of a filter element;
Figure 7 is a side view of a filter element;
and Figure 8 is a curve illustrating the performancQ of a waste water treatment system.
Referring therefore to Figures L to 3, a waste treatment system generally indicated to by reference numeral 10 receives inf luent through a pipe 12 which is stored in a surge tank 14. A pump 16 under the control of a float valve 18 transfers influent from the surge tank to an array 20 of reactors 22. In the specific embodiment, the array 20 is provided by two parallel banks 24,26 of reactors 22. The banks 24,26 are connected to operate in series and with a corridor 25 between them. Each bank 24,26 in turn has two rows of reactors 2 2 with the reactors 2 2 in each row connected in series so that influent will pass through one row of reactors of each bank before being discharged as 3 5 ef f luent . The rows in each bank theref ore operate in parallel to divide the effluent flow. Other configurations are of course possible.
21794~9 .
Each of the reactors 22 is supported over a respectivc sump 28, which collects fluid flowing through the reactors 22. Pumps 34 in each of the sumps 28 transfer the collected fluid to a spray head 35 over each 5 of reactors 22 for further treatment.
Effluent from the sumps 28 discharge over a weir 36 and through a flocculating filter 38 into a holding tank 40. EffIuent is discharged from the holding tank through a pipe 42. Influent from the pipe 12 is 10 thus passed through a succession of filters 22 until the required quality of effluent is achieved.
Each of the reactors 22 is formed from stacks of filter modules 47 each of which includes filter elements 44 which are retained within a frame indicated 15 to by reference numeral 46. The filter elements 44 are similar in construction and will be described further below. An air supply manifold 45 having an outlet between each filter module 47 is also incoL~L~l_ed within each reactor 22 to ensure a sufficient supply of oxygen 20 for aerobic operation.
It will be noted from Figure 2, that the filter elements 44 within each filter module 47 extend laterally in side-by-side relationship and abut one another along opposed surfaces. The filter elements 44 in each filter 25 module 47 are oriented orthogonally to the elements immediately above or below, that is the axis of the filter elements alternate from level to level, and thus avoid6 a direct path through the reactors 22.
Each of the elements 44 is formed from a 30 fragmented plastic, typically waste plastic which is shredded to provide a nominal size that provides a developed surface area of between 60 and 90 square feet per cubic feet. Typically, shredded strips ~of between 1~"
and 3" wide provides the requisite range of densities and 35 it is found that such strips shredded from curved articles such as bottles provide the requisite degree of compressibility and separation of developed areas.
~1 ~9~49 Preferably for washed operation the plastic strips are hydrophilic to promote adherence of the effluent to the surface. Hydrophobic waste plastic may be treated with acid solutions to etch the surface and render it hydrophilic. In order to minimize intimate contact between flat surfaces that would reduce the developed area, it i8 preferred that closed curved loops of waste material are used, e.g. slices of a cylindrical bottle. Open-ended strips of material may be used provided they have sufficient inherent .;uLv~u.a and resilience to resist packing with other strips and to maintain their surfaces separated from adjacent strips.
After shredding, the wa6te plastic is assembled into the f ilter elements as shown in Figures 6 and 7 by forming a cylindrical outer sleeve 48 of plastic mesh that typically has a nominal size of 2". Shredded plastic strips 50 are located within the sleeve 48 to provide a random, non-oriented medium with the ends of the sleeve 48 folded over to contain the plastic strips 50. The sleeve 48 contains sufficient of the strips 50 to provide the required developed surface area for the volume of the sleeve with variations of the density being provided within the reactor vessel. The plastic strips are _ esued from their free body ahape within the sleeves 48 with a 3 :1 ~ L e:ssion ratio being typical .
t'~ ession ratios of between 2 :1 and 4 :1 appear to be suitable to provide the requisite developed area within the filter elements 44 and still maintain separation of the surfaces.
The filter elements 44 are contained within frame 46 which as can be 3een from Figure 3 includes an open rL, ~ with top and bottom rails 52, 54 and corner posts 56. Int~ te bars 58 extend between the top and bottom rails 52, 54 at intervals and diagonal braces 60 provides rigidity ~or the frame work.
The sleeves 48 are flexible but substantially inelastic and are dimensioned to provide a snug f it of " " 217~q49 .
the filter elements 44 within the filter module 47. The plastic strips 50 within sleeve 48 are sufficiently ~ :,sible that the cross-section of the sleeve may be changed from circular as shown in Figure 5a to generally 5 rectangular as shown in Figure 5b. The e~ion of the filter elements 44 ensures a close abutment along the opposed edgeg of the sleeves to provide a reasonably hl -,_..uus filter bed for the effluent within each frame 46 .
Each of the reactors 22 are formed from stacks of frames 46 that are supported in a structural rL vLh 62 (Figures 3 and 4). The framework 62 includes vertical pillars 64 that support rails 66. The lower end of each of the corner posts 56 is slidably supported in the rails 66 so as to be laterally movable relative to the adjacent frames 46. Accordingly, each filter module 47 may be slid laterally into the corridor 25 80 that the filter elements 44 may be serviced without interruption of the flltration process.
A6 noted above, the strips 50 may be packed within the sleeves 48 to provide different surface areas for a given volume. Accordingly, the filter elements may conveniently progressively increase in density and developed area from the top of each reactor toward6 the bottom to provide a progressive filtering action upon the effluent. Typically, the filter elements 44 in the upper frames 46 will have a developed area of 60 ftZ per ft3 plo~L.assively increasing to 90 ft2 per ft3 at the lower level .
In operation, therefore, the effluent is progressively passed through the reactors 22 where it passe6 from top to bottom through the filter elements 44.
The plastic strips 50 within the elements 44 provide the requisite developed surface for anaerobic or aerobic action with progressively increasing density of filter medium. The effluent received in each sump 28 i6 either ~1 ~9449 recycled through the same reactor or passed to the next reactor until it progresses to the effluent pipe 42.
If it becomes n~ pscAry to service the filter elements 44, the frame 46 may be slid on the rails 66 out of the reactors 22 to provide access to the filter elements 44. In 60 doing, however, the reactors 22 may continue to operate although with reduced efficiency due to the removal of one of the f ilter modules . The f ilter elements 44 may then be removed from the frame 46 for cleaning or repl~ t and the refurbished filter module r_LuLl.ed to thc reactor once service i8 complete.
The modular construction of the reactor 22 also permits the performance of the waste treatment facility to be adjusted to the particular needs. As seen in Figure 8, the percentage of BODs removed by each reactor is in the range of 7 . 5% after initial removal in the first reactor. This performance is ~bf l;nP-l for a reactor having 5 filter modules 47 each of nominal size 6 . 0 ft. by 6 . 0 ft. by 2 . 0 ft. and with a developed area of between 60 and go ft2 per ft3. Obviously, additional filter modules could be added to each reactor, or additional reactors added to each bank or additional banks added aB i8 most appropriate if additional removal i8 required.
The reactors may be operated in a washed or ~dry" mode, as shown in Figure 1, or may be operated in a submerged or ~wet" mode as required. When operating in the dry mode, air may be supplied through the manifold 45 to promote the aerobic action on the developed surfaces.
The amount of air supplied will depend upon the particular operating condition6 of each reactor and may be adjusted to suit.
The use of the waste plastic strips 50 provides an ~:XL.L~ -ly economical filter medium and is found to have the nP~-Pcs~ry developed surface area per unit volume. The inherent curvature found in many waste products ensures that the ad~acent services of the strips 2~4~9 remain separate to thereby maintain the required surface area. Adjustment of the compression ratio and/or the shredding size will also adjust the developed surface area within each filter element. Accordingly, it will be 5 seen that a simple yet effective reactor is provided that may be adapted in many conf igurations to suit the particular needs.
.
RTnl;'IT.'l'r The present invention relates to a filter for use in the biological treatment of water in both aerobic 5 and anaerobic conditions.
The oldest well-known biofilters applied widely in water treatment include biof ilters made of natural materials, such a6 sand, gravel, or properly granulated basalt or granite stones . Biof ilters have also been 10 filled with other natural materials, such as blast-furnace coke or slag.
Another form of biofilter i5 a biochemical reactor, in which biologically active material is situated upon a spatially developed filter medium. These 15 have also been used in water treatment. In one ~mho~ nt a filter medium is made of porous blocks of thin shaped plastic boards glued together. The blocks, placed in layers on a grid within the biochemical reactor (biofilter) serve as a base for a layer of micro-20 organisms which take part in d~ ition and synthesisof chemical compounds.
Other extensively used biofilters are filled with rings, balls or other g~ ~L ically shaped elements made of ceramic materials or plastic . Floating f ibres, 25 coils, tapes and nets made of plastic have also been used as biofilter fillings.
The previously known biof ilters, as a result of the growth of microorganisms and biodegradation, become excessively polluted and have to be cleaned or replaced 30 after a specific period of time. This task is difficult and expensive, and requires a temporal shut-down of the water treatment plant.
Water treatment plants have been usually built as stationary units with biofilters of specific, 35 invariable dimensions. This narrows the possibility to choose a water treatment plant according to the speciric needs of recipients. Such water treatment plants are generally lln~ cal as far as their size and adjustment to individual needs are concerned.
217~4~9 , It i8 therefore an object of the present invention to provide a filter that obviates or mitigates the above disadvantages.
In general terms, the present invention 5 provides a filter that includes filter elements formed from non-oriented plastic strips made of r~, ~ed, preferably cut, waste plastic products with a surface which constitutes a base for a layer of micro-organisms.
The strips are used as a f illing that is located within 10 flexible inelastic sleeves that may be flexed to adapt to a cuboidal, preferably cubic configuration. A filter can contain any number of such identical f ilter elements a~sembled into modules that form a stiff, light-weight structure .
It has been found that the plastic strips may readily provide a surface area of between 60 ft2 and 90 ft2 for each 1 ft3 of filter to permit effective aerobic or anaerobic operation.
In the preferred ~mhQrlir~-lt of the invention, 20 the utilization of fragmented waste plastic products reduces the production costs of the biofilter, and at the same time, if such biological reactors are widely used, it will help protect the natural environment through plastic waste disposal. Placing the filter elements in 25 modules permits the construction of biofilters suitable in siÆe to the amount of f iltered water . This enables one to choose the dimensions of a water treatment plant according to individual requirements.
A biof ilter built of modules as described in 3o the preferred ~mhorlil lt can serve as a submerged ("wet") or washed ("dry") biofilter and can be used in both aerobic and anaerobic treatment methods. This arrangement also facilitates construction from separate containers that can be easily replaced when, due to the 35 growth of micro-organisms on the specific surface and biodegradation, they become excessively polluted.
.
The construction of a biof ilter according to the preferred ~ t requires relatively small illVeDi --L and provides low operating costs of treatment plants .
An ~ nt of the invention will now be described by way of example only with reference to the ;lr -nying drawings, in which:
Figure 1 is a schematic representation of a waste water treatment system;
Figure 2 is a perspective view of a portion of a biofilter used in the system of Figure l;
Figure 3 is a side view of a frame used in the biof ilter of Figure 2;
Figure 4 is a view on the line 4-4 of Figure 3;
Figures 5a and 5b show the assembly of the biofilter utilizing the frame of Figure 3;
Figure 6 is an end view of a filter element;
Figure 7 is a side view of a filter element;
and Figure 8 is a curve illustrating the performancQ of a waste water treatment system.
Referring therefore to Figures L to 3, a waste treatment system generally indicated to by reference numeral 10 receives inf luent through a pipe 12 which is stored in a surge tank 14. A pump 16 under the control of a float valve 18 transfers influent from the surge tank to an array 20 of reactors 22. In the specific embodiment, the array 20 is provided by two parallel banks 24,26 of reactors 22. The banks 24,26 are connected to operate in series and with a corridor 25 between them. Each bank 24,26 in turn has two rows of reactors 2 2 with the reactors 2 2 in each row connected in series so that influent will pass through one row of reactors of each bank before being discharged as 3 5 ef f luent . The rows in each bank theref ore operate in parallel to divide the effluent flow. Other configurations are of course possible.
21794~9 .
Each of the reactors 22 is supported over a respectivc sump 28, which collects fluid flowing through the reactors 22. Pumps 34 in each of the sumps 28 transfer the collected fluid to a spray head 35 over each 5 of reactors 22 for further treatment.
Effluent from the sumps 28 discharge over a weir 36 and through a flocculating filter 38 into a holding tank 40. EffIuent is discharged from the holding tank through a pipe 42. Influent from the pipe 12 is 10 thus passed through a succession of filters 22 until the required quality of effluent is achieved.
Each of the reactors 22 is formed from stacks of filter modules 47 each of which includes filter elements 44 which are retained within a frame indicated 15 to by reference numeral 46. The filter elements 44 are similar in construction and will be described further below. An air supply manifold 45 having an outlet between each filter module 47 is also incoL~L~l_ed within each reactor 22 to ensure a sufficient supply of oxygen 20 for aerobic operation.
It will be noted from Figure 2, that the filter elements 44 within each filter module 47 extend laterally in side-by-side relationship and abut one another along opposed surfaces. The filter elements 44 in each filter 25 module 47 are oriented orthogonally to the elements immediately above or below, that is the axis of the filter elements alternate from level to level, and thus avoid6 a direct path through the reactors 22.
Each of the elements 44 is formed from a 30 fragmented plastic, typically waste plastic which is shredded to provide a nominal size that provides a developed surface area of between 60 and 90 square feet per cubic feet. Typically, shredded strips ~of between 1~"
and 3" wide provides the requisite range of densities and 35 it is found that such strips shredded from curved articles such as bottles provide the requisite degree of compressibility and separation of developed areas.
~1 ~9~49 Preferably for washed operation the plastic strips are hydrophilic to promote adherence of the effluent to the surface. Hydrophobic waste plastic may be treated with acid solutions to etch the surface and render it hydrophilic. In order to minimize intimate contact between flat surfaces that would reduce the developed area, it i8 preferred that closed curved loops of waste material are used, e.g. slices of a cylindrical bottle. Open-ended strips of material may be used provided they have sufficient inherent .;uLv~u.a and resilience to resist packing with other strips and to maintain their surfaces separated from adjacent strips.
After shredding, the wa6te plastic is assembled into the f ilter elements as shown in Figures 6 and 7 by forming a cylindrical outer sleeve 48 of plastic mesh that typically has a nominal size of 2". Shredded plastic strips 50 are located within the sleeve 48 to provide a random, non-oriented medium with the ends of the sleeve 48 folded over to contain the plastic strips 50. The sleeve 48 contains sufficient of the strips 50 to provide the required developed surface area for the volume of the sleeve with variations of the density being provided within the reactor vessel. The plastic strips are _ esued from their free body ahape within the sleeves 48 with a 3 :1 ~ L e:ssion ratio being typical .
t'~ ession ratios of between 2 :1 and 4 :1 appear to be suitable to provide the requisite developed area within the filter elements 44 and still maintain separation of the surfaces.
The filter elements 44 are contained within frame 46 which as can be 3een from Figure 3 includes an open rL, ~ with top and bottom rails 52, 54 and corner posts 56. Int~ te bars 58 extend between the top and bottom rails 52, 54 at intervals and diagonal braces 60 provides rigidity ~or the frame work.
The sleeves 48 are flexible but substantially inelastic and are dimensioned to provide a snug f it of " " 217~q49 .
the filter elements 44 within the filter module 47. The plastic strips 50 within sleeve 48 are sufficiently ~ :,sible that the cross-section of the sleeve may be changed from circular as shown in Figure 5a to generally 5 rectangular as shown in Figure 5b. The e~ion of the filter elements 44 ensures a close abutment along the opposed edgeg of the sleeves to provide a reasonably hl -,_..uus filter bed for the effluent within each frame 46 .
Each of the reactors 22 are formed from stacks of frames 46 that are supported in a structural rL vLh 62 (Figures 3 and 4). The framework 62 includes vertical pillars 64 that support rails 66. The lower end of each of the corner posts 56 is slidably supported in the rails 66 so as to be laterally movable relative to the adjacent frames 46. Accordingly, each filter module 47 may be slid laterally into the corridor 25 80 that the filter elements 44 may be serviced without interruption of the flltration process.
A6 noted above, the strips 50 may be packed within the sleeves 48 to provide different surface areas for a given volume. Accordingly, the filter elements may conveniently progressively increase in density and developed area from the top of each reactor toward6 the bottom to provide a progressive filtering action upon the effluent. Typically, the filter elements 44 in the upper frames 46 will have a developed area of 60 ftZ per ft3 plo~L.assively increasing to 90 ft2 per ft3 at the lower level .
In operation, therefore, the effluent is progressively passed through the reactors 22 where it passe6 from top to bottom through the filter elements 44.
The plastic strips 50 within the elements 44 provide the requisite developed surface for anaerobic or aerobic action with progressively increasing density of filter medium. The effluent received in each sump 28 i6 either ~1 ~9449 recycled through the same reactor or passed to the next reactor until it progresses to the effluent pipe 42.
If it becomes n~ pscAry to service the filter elements 44, the frame 46 may be slid on the rails 66 out of the reactors 22 to provide access to the filter elements 44. In 60 doing, however, the reactors 22 may continue to operate although with reduced efficiency due to the removal of one of the f ilter modules . The f ilter elements 44 may then be removed from the frame 46 for cleaning or repl~ t and the refurbished filter module r_LuLl.ed to thc reactor once service i8 complete.
The modular construction of the reactor 22 also permits the performance of the waste treatment facility to be adjusted to the particular needs. As seen in Figure 8, the percentage of BODs removed by each reactor is in the range of 7 . 5% after initial removal in the first reactor. This performance is ~bf l;nP-l for a reactor having 5 filter modules 47 each of nominal size 6 . 0 ft. by 6 . 0 ft. by 2 . 0 ft. and with a developed area of between 60 and go ft2 per ft3. Obviously, additional filter modules could be added to each reactor, or additional reactors added to each bank or additional banks added aB i8 most appropriate if additional removal i8 required.
The reactors may be operated in a washed or ~dry" mode, as shown in Figure 1, or may be operated in a submerged or ~wet" mode as required. When operating in the dry mode, air may be supplied through the manifold 45 to promote the aerobic action on the developed surfaces.
The amount of air supplied will depend upon the particular operating condition6 of each reactor and may be adjusted to suit.
The use of the waste plastic strips 50 provides an ~:XL.L~ -ly economical filter medium and is found to have the nP~-Pcs~ry developed surface area per unit volume. The inherent curvature found in many waste products ensures that the ad~acent services of the strips 2~4~9 remain separate to thereby maintain the required surface area. Adjustment of the compression ratio and/or the shredding size will also adjust the developed surface area within each filter element. Accordingly, it will be 5 seen that a simple yet effective reactor is provided that may be adapted in many conf igurations to suit the particular needs.
Claims (25)
1. A reactor vessel for the treatment of fluid waste comprising:
a frame;
a plurality of filter elements contained within said frame each of which includes a flexible porous outer sleeve and filter medium contained by said sleeve, said filter medium being formed from fragmented plastic and being compressible to permit flexure of said sleeve, said filter elements being arranged side by side and in abutment with longitudinal axes of each filter element being generally parallel, said filter elements having a free body width greater than the width of said frame and being fitted within said frame by flexure of said sleeves.
a frame;
a plurality of filter elements contained within said frame each of which includes a flexible porous outer sleeve and filter medium contained by said sleeve, said filter medium being formed from fragmented plastic and being compressible to permit flexure of said sleeve, said filter elements being arranged side by side and in abutment with longitudinal axes of each filter element being generally parallel, said filter elements having a free body width greater than the width of said frame and being fitted within said frame by flexure of said sleeves.
2. A reactor vessel according to claim 1 wherein said filter medium has a developed surface of between 60 ft2/ft3 and 90 ft2/ft3.
3. A reactor vessel according to claim 1 wherein said fragmented plastic has a hydrophilic surface.
4. A reactor vessel according to claim 1 wherein said fragmented plastic is curved and is inherently resilient to maintain adjacent surfaces of said fragmented plastic separated.
5. A reactor vessel according to claim 4 wherein said fragmented plastic is formed as closed loops.
6. A reactor vessel according to claim 4 wherein said fragmented plastic is compressed from its free body shape into said outer sleeve.
7. A reactor vessel according to claim 6 wherein said fragmented plastic is compressed to a volume of between and of its free body shape.
8. A reactor vessel according to claim 6 wherein said fragmented plastic is compressed to a volume of 1/3 of its free body shape.
9. A reactor vessel according to claim 7 wherein said fragmented plastic has a developed surface of between 60 ft2/ft3 and 90 ft2/ft3.
10. A reactor vessel according to claim 6 wherein said sleeve is flexible and inelastic.
11. A reactor vessel according to claim 10 wherein said sleeve is an open mesh.
12. A reactor vessel having a plurality of filter modules arranged in seriatim along an effluent flow path, each of said filter modules having a plurality of elongate filter elements with longitudinal axes disposed normal to said flow path, the longitudinal axes of filter elements in adjacent filter modules being orthogonal to one another to provide a substantially homogeneous filter medium in vessel.
13. A reactor vessel according to claim 12 wherein each of said filter elements is flexible and abuts an adjacent filter element along one side.
14. A rector vessel according to claim 12 wherein each of said filter modules is selectively removable from said reactor vessel.
15. A reactor vessel according to claim 14 wherein said filter module is removable in a direction normal to said flow path.
16. A reactor vessel according to claim 12 wherein each filter module includes a frame to contain said filter elements, said frame being dimensioned to hold said filter elements in a flexed condition to cause abutment of adjacent filter elements.
17. A reactor vessel according to claim 16 wherein each of said filter elements includes a flexible outer sleeve and a flexible filter medium within said sleeve.
18. A reactor vessel according to claim 16 wherein said fragmented plastic has a developed surface of between 60 ft2/ft3 and 90 ft2/ft3.
19. A reactor vessel according to claim 17 wherein said outer sleeve is flexible and inelastic.
20. A reactor vessel according to claim 19 wherein said filter elements have a free body width greater than the width of said frame, said filter elements being fitted within said frame by flexure of said sleeve.
21. A reactor vessel according to claim 20 wherein said fragmented plastic has a developed surface of between 60 ft2/ft3 and 90 ft2/ft3.
22. A reactor vessel according to claim 17 wherein said filter medium is formed from fragmented plastic and is compressible to permit flexure of said sleeve.
23. A reactor vessel according to claim 22 wherein said filter medium has a developed surface of between 60 ft2/ft3 and 90 ft2/ft3.
24. A reactor vessel according to claim 23 wherein said fragmented plastic is curved and is inherently resilient to maintain adjacent surfaces of said fragmented plastic separated.
25. A reactor vessel according to claim 24 wherein said fragmented plastic is formed as closed loops.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL30898995A PL308989A1 (en) | 1995-06-08 | 1995-06-08 | Biological bed |
| PLP-308989 | 1995-06-21 | ||
| US08/534,257 | 1995-09-26 | ||
| US08/534,257 US5609753A (en) | 1995-06-08 | 1995-09-26 | Biofilter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2179449A1 true CA2179449A1 (en) | 1996-12-22 |
Family
ID=26653169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2179449 Abandoned CA2179449A1 (en) | 1995-06-08 | 1996-06-19 | Biofilter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2179449A1 (en) |
-
1996
- 1996-06-19 CA CA 2179449 patent/CA2179449A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |