CA2065350C - Process and apparatus for biological reactor to purify water - Google Patents
Process and apparatus for biological reactor to purify water Download PDFInfo
- Publication number
- CA2065350C CA2065350C CA 2065350 CA2065350A CA2065350C CA 2065350 C CA2065350 C CA 2065350C CA 2065350 CA2065350 CA 2065350 CA 2065350 A CA2065350 A CA 2065350A CA 2065350 C CA2065350 C CA 2065350C
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Classifications
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- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
- C02F3/288—Particular arrangements for anaerobic reactors comprising septic tanks combined with a filter
-
- 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
- C02F3/04—Aerobic processes using trickle filters
- C02F3/046—Soil filtration
-
- 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
- C02F3/06—Aerobic processes using submerged filters
-
- 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
-
- 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
Abstract
A system and method to remove pathogenic organisms and other contaminants from sewage or other contaminated water by an inexpensive, nearly maintenance free device. Principles of operation include methods which combine suspended and fixed film biological reactor, settling chamber, physical filter and composting technology to achieve tertiary sewage treatment and equivalent treatment of contaminated water. Contaminated water flows into the apex or center (13) of a large circular, wedge or conic chamber (12), then raidally through precisely shaped layers of medium (15-20) which provide progressive treatment by reduced pore size and increased surface area as the flow proceeds to the periphery. Oxygen can be diffused into the final treatment stage by providing large surface exposure to ambient afire. The treated effluent may be disposed as normal surface run-off (22), used for irrigation and landscaping or allowed to percolate into subsurface soil without clog mat formation.
Description
iG~~~ ~ J
-1' PROCESS AND APPARATUS FOR A BIOLOGICAL REACTOR TO PURIFY WATER
Background Of The Invention This invention involves a substantial departure from current art, using natural forces to purify sewage or other tainted water by impounding it under conditions which permit those forces to work with unique effectiveness. When the water is sufficiently pure, it can be reused or released benignly into the hydrological cycle.
The increasing knowledge of the vulnerability and importance of clean water supplies require that sewage and other contaminated waste water not be dumped into the environment without treatment to mitigate or eliminate its adverse impact. The use of contaminated water~for processing and/or household may also require pretreatment or purification.
Historically, water purification has taken advantage, in some cases, of aerobic or anaerobic biological devices to produce improved effluent using biota fixed on a substrate, or suspended. Anaerobic devices have traditionally been limited to a maximum of about 70%-80% treatment and proposed as polishing stages prior to some further action, as in E.J. Jordan's (3,950,252 4/1976 & 4,211,655 7/1980), A.A. Monson's (4,162,976 7/1979), and A.W. Green's (4,293,421 10/1981) U.S. Patents.
Aerobic devices, which are more biologically efficient than anaerobic ones and can produce complete treatment, suffer from the requirement of the use of vari ous powered mechani sms to mix effl uent with ai r and as a resul t, are relatively expensive and unreliable, often requiring the use of disinfection which chemically repollutes the treated effluent. When used for sewage treatment, they frequently are not maintained properly releasing a low grade effluent resulting in environmental damage.
This invention, by contrast, advances the technology an order of magnitude by achieving reliable, cheap and complete treatment without mechanical or powered components. It permits higher efficiency, a 4-5 log reduction in sewage fecal coliform bacteria, a 99+% removal of biological oxygen demand and suspended solids, plus substantial reduction in other organic and inorganic solutes. It is driven by a hydraulic static head of but several inches. ~ It can produce limpid, odorless water that can be reused.
WO 91103429 " . PCT/US90/0463~
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This device is inexpensive to install and requires no normal maintenance.
It can conveniently be installed under a lawn, building or parking area. It requires no separation 'From surface water, wells or property lines. Its products can be used for decorating ponds, fountains or irrigation.
Summary Of The Invention Impure water or sewage released into an ordinary sand filter apparatus will sustain low levels of treatment if the sand medium is coarse and/or cause the filter to clog if it is fine.
The essence of this method is to infuse impure water at extremely low velocities and with a residence time of several days or weeks through a plurality of precisely graded progressively finer pored media, larger interface area and reaction volume, smaller average interstitial distance, and increasingly more intimate contact between biota and pollutants. The complete device collectively then becomes, in effect, a huge beneficial organism consuming sewage and releasing as byproducts pure water plus some natural inocuous gases.
This progressive treatment may be provided most efficiently by constructing the reactor in a cylinder, wedge or cone shape with the largest pored medium at the center or apex where the impure water is introduced. It then seeps radially under slight hydrostatic pressure to the periphery, while being purified.
Incidental and passive contact with ambient air at the surface of the structure will support some aerobic biota by oxygen diffusion which will treat even more efficiently. This can be maximized by shaping the apparatus to provide a large ambient air-effluent interface, while keeping the effluent entirely within the medium. ' The effluent can be impounded by creating a precisely shaped and ' dimensioned chamber lined with impervious, biologically stable material such , as concrete, metal, plastic, or to save expense, sculpted out of soil whose particle size is small enough to prevent escape of untreated water, or coarser introduced. It then seeps radially under slight hydrostatic pressure to the ,.-:- '~ r~'~ ~"? ;l~ . .
_3-periphery, while being purified.
Incidental and passive contact with ambient air at the surface of the structure will support some aerobic biota by oxygen diffusion which will treat even more efficiently, This can be ma;cimized by shaping the apparatus to provide a large ambient air-effluent interface, while keeping the effluent entirely within the medium.
The effluent can be impounded by creating a precisely shaped and dimensioned chamber lined with impervious, biologically stable material such as concrete, metal, plastic, or to save expense, sculpted out of soil whose particle size is small enough to prevent escape of untreated water, or coarser soi l lined with a geomembrane, tight fabric; or very finely pored material such as clay, to isolate effluent from ground water.
Where uphill flow is required by relative elevations, or additional processing capacity is required, pumps and/or optional air-effluent mixers of various types may be used. Ports for effluent sampling and gas escape may extend from each medium layer to the surface for easy access. The top layer of medium can be extended to provide for increased passive air exposure, or a planting area for attractive water-loving plants, exotic landscaping, ponds, falls or fountains.
The influent apex or center section of the impoundment chamber can be expanded to make a flotation separation and sludge storage device to supplement or replace normal septic tank action. The sludge storage chamber can be emptied and physical filtration renewed by back-flushing with treated effluent or other clean water, should it become necessary.
Insulation can be installed around the chambers and a greenhouse or other enclosure over the surface exposure to retain reactor heat for greater reaction velocity.
Medium may be exceptionally well graded gravel and sand for least expense, or any other uniformly porous material possibly made of granular mineral, plastic or metal media or open cell foam plastic or metal. Layers may be separated by fabric or other porous cohesive material to prevent mixing of WO 91/03429 PCT/iJS90/04~35 media.
The number of consecutive layers used, their volume and pore size will vary for each use depending on, among otr~er things, the volume of effluent, the character of the contaminants, the type of media employed and 'the degree of purification required.
Brief Description Of The Drawings Fig, 1. is an overhead view of the simplest version of the preferred embodiment in cone shape.
Fig~2..is a side view of the simplest version of the preferred embodiment in cone or vertical wedge.
Fig3. is a side view showing an extended final phase to confine direct purified effluent to a specific disposal area such as a ditch, drain, surface water, etc.
Figs. 4, through 6, are perspective views of some examples of general chamber shapes to illustrate some variations.
Fig7. is an overhead view of a separated monomedium bed series.
Detailed Description Of The Drawings In Fig. 1., top view, the influent (11) enters the settling chamber from the influent pipe (10) then through the perforated plate (14) into the first layer (15) flowing radially, axially and upward through the conic (in this case) chamber over the upper peripheral edge of the cone into the environment (21).
In Fig. 2., side view, the influent pipe (10) brings contaminated water (11) from an ordinary septic tank or other source and guides it to the apex of the chamber (12) into the settling chamber (13) which discharges through a perforated separator (14) into the coarsest medium (15), in this case, 2-1/2"
X 1-1/2" well washed gravel, for further settling and fixed and suspended WO 91/03429 PC f/US90/046~~
'S-biotic reaction. It then moves through a porous medium separator (16), in this example 3/16" mesh plastic screen, 'the metal or plastic mesh is typically similar in pore size to the finer medium (this separator is not essential, but may be helpful depending on the buoyancy and fluidity of the media) into the finer medium (17), in this case, 5/8" X 3/8" well washed gravel, where further treatment as in medium (15) occurs, but with greater efficiency and physical filtration of suspended solids. Thence, similarly into medium (18), in 'this case, washed sand with an effective size of .80-2.00 mm and a uniformity cone coefficient of <1.5 repeating the progressive purification until arriving at medium (19), in this example, washed sand with an effective size of .50-.60 mm and a uniformity coefficient of <1.6 to the final medium (20), in this case, sand with an effective size of .35-.45 mm and a uniformity coefficient of <1.2 shown, in this case, buried in native top soil (21) sufficiently hydraulically conductive to permit unconfined radial gravity flow to disperse the purified water (22) into local shallow ground water. Sampling and gas escape ports (23) are run from the medium layer to the surface. An optional air injection (24) may be used to aerate the effluent.
In Fig. 3., the hydraulic flow and purification principles are the same as in Fig. 1, except that the flow is retained after purification by constructing an impermeably lined channel (26) to confine and guide the product through a permeable medium (20) into a specific disposal or reuse area (27). This channel can provide extra aeration, landscaping irrigation, as well as transportation. Insulation (28) and housing (29) can thermally isolate the chamber.
In Figs. 4. through 6. are perspective views of some typical chamber shapes and flows that can be used alone or in series.
In Fig. 7. is an overhead view of the specified principle being executed with discrete monomedium beds or chambers as phases, interconnected by plumbing or other connections. ' Especially selected biota may be used to innoculate the media and/or special nutrients may be added to increase treatment efficiency. Catalytic media may be used to accelerate chemical reactions.
SUBSTITUTE SUEET
_6_ ..
a5 ~r~~~
The preferr~~m~Dt3'diments and uses are described above for illustrative purposes. It is to be understood that variations and modifications or other uses lie within the scope of the following claims.
i
-1' PROCESS AND APPARATUS FOR A BIOLOGICAL REACTOR TO PURIFY WATER
Background Of The Invention This invention involves a substantial departure from current art, using natural forces to purify sewage or other tainted water by impounding it under conditions which permit those forces to work with unique effectiveness. When the water is sufficiently pure, it can be reused or released benignly into the hydrological cycle.
The increasing knowledge of the vulnerability and importance of clean water supplies require that sewage and other contaminated waste water not be dumped into the environment without treatment to mitigate or eliminate its adverse impact. The use of contaminated water~for processing and/or household may also require pretreatment or purification.
Historically, water purification has taken advantage, in some cases, of aerobic or anaerobic biological devices to produce improved effluent using biota fixed on a substrate, or suspended. Anaerobic devices have traditionally been limited to a maximum of about 70%-80% treatment and proposed as polishing stages prior to some further action, as in E.J. Jordan's (3,950,252 4/1976 & 4,211,655 7/1980), A.A. Monson's (4,162,976 7/1979), and A.W. Green's (4,293,421 10/1981) U.S. Patents.
Aerobic devices, which are more biologically efficient than anaerobic ones and can produce complete treatment, suffer from the requirement of the use of vari ous powered mechani sms to mix effl uent with ai r and as a resul t, are relatively expensive and unreliable, often requiring the use of disinfection which chemically repollutes the treated effluent. When used for sewage treatment, they frequently are not maintained properly releasing a low grade effluent resulting in environmental damage.
This invention, by contrast, advances the technology an order of magnitude by achieving reliable, cheap and complete treatment without mechanical or powered components. It permits higher efficiency, a 4-5 log reduction in sewage fecal coliform bacteria, a 99+% removal of biological oxygen demand and suspended solids, plus substantial reduction in other organic and inorganic solutes. It is driven by a hydraulic static head of but several inches. ~ It can produce limpid, odorless water that can be reused.
WO 91103429 " . PCT/US90/0463~
f°,.-, <....
~~?'~:'~''~'fl -2- ...
This device is inexpensive to install and requires no normal maintenance.
It can conveniently be installed under a lawn, building or parking area. It requires no separation 'From surface water, wells or property lines. Its products can be used for decorating ponds, fountains or irrigation.
Summary Of The Invention Impure water or sewage released into an ordinary sand filter apparatus will sustain low levels of treatment if the sand medium is coarse and/or cause the filter to clog if it is fine.
The essence of this method is to infuse impure water at extremely low velocities and with a residence time of several days or weeks through a plurality of precisely graded progressively finer pored media, larger interface area and reaction volume, smaller average interstitial distance, and increasingly more intimate contact between biota and pollutants. The complete device collectively then becomes, in effect, a huge beneficial organism consuming sewage and releasing as byproducts pure water plus some natural inocuous gases.
This progressive treatment may be provided most efficiently by constructing the reactor in a cylinder, wedge or cone shape with the largest pored medium at the center or apex where the impure water is introduced. It then seeps radially under slight hydrostatic pressure to the periphery, while being purified.
Incidental and passive contact with ambient air at the surface of the structure will support some aerobic biota by oxygen diffusion which will treat even more efficiently. This can be maximized by shaping the apparatus to provide a large ambient air-effluent interface, while keeping the effluent entirely within the medium. ' The effluent can be impounded by creating a precisely shaped and ' dimensioned chamber lined with impervious, biologically stable material such , as concrete, metal, plastic, or to save expense, sculpted out of soil whose particle size is small enough to prevent escape of untreated water, or coarser introduced. It then seeps radially under slight hydrostatic pressure to the ,.-:- '~ r~'~ ~"? ;l~ . .
_3-periphery, while being purified.
Incidental and passive contact with ambient air at the surface of the structure will support some aerobic biota by oxygen diffusion which will treat even more efficiently, This can be ma;cimized by shaping the apparatus to provide a large ambient air-effluent interface, while keeping the effluent entirely within the medium.
The effluent can be impounded by creating a precisely shaped and dimensioned chamber lined with impervious, biologically stable material such as concrete, metal, plastic, or to save expense, sculpted out of soil whose particle size is small enough to prevent escape of untreated water, or coarser soi l lined with a geomembrane, tight fabric; or very finely pored material such as clay, to isolate effluent from ground water.
Where uphill flow is required by relative elevations, or additional processing capacity is required, pumps and/or optional air-effluent mixers of various types may be used. Ports for effluent sampling and gas escape may extend from each medium layer to the surface for easy access. The top layer of medium can be extended to provide for increased passive air exposure, or a planting area for attractive water-loving plants, exotic landscaping, ponds, falls or fountains.
The influent apex or center section of the impoundment chamber can be expanded to make a flotation separation and sludge storage device to supplement or replace normal septic tank action. The sludge storage chamber can be emptied and physical filtration renewed by back-flushing with treated effluent or other clean water, should it become necessary.
Insulation can be installed around the chambers and a greenhouse or other enclosure over the surface exposure to retain reactor heat for greater reaction velocity.
Medium may be exceptionally well graded gravel and sand for least expense, or any other uniformly porous material possibly made of granular mineral, plastic or metal media or open cell foam plastic or metal. Layers may be separated by fabric or other porous cohesive material to prevent mixing of WO 91/03429 PCT/iJS90/04~35 media.
The number of consecutive layers used, their volume and pore size will vary for each use depending on, among otr~er things, the volume of effluent, the character of the contaminants, the type of media employed and 'the degree of purification required.
Brief Description Of The Drawings Fig, 1. is an overhead view of the simplest version of the preferred embodiment in cone shape.
Fig~2..is a side view of the simplest version of the preferred embodiment in cone or vertical wedge.
Fig3. is a side view showing an extended final phase to confine direct purified effluent to a specific disposal area such as a ditch, drain, surface water, etc.
Figs. 4, through 6, are perspective views of some examples of general chamber shapes to illustrate some variations.
Fig7. is an overhead view of a separated monomedium bed series.
Detailed Description Of The Drawings In Fig. 1., top view, the influent (11) enters the settling chamber from the influent pipe (10) then through the perforated plate (14) into the first layer (15) flowing radially, axially and upward through the conic (in this case) chamber over the upper peripheral edge of the cone into the environment (21).
In Fig. 2., side view, the influent pipe (10) brings contaminated water (11) from an ordinary septic tank or other source and guides it to the apex of the chamber (12) into the settling chamber (13) which discharges through a perforated separator (14) into the coarsest medium (15), in this case, 2-1/2"
X 1-1/2" well washed gravel, for further settling and fixed and suspended WO 91/03429 PC f/US90/046~~
'S-biotic reaction. It then moves through a porous medium separator (16), in this example 3/16" mesh plastic screen, 'the metal or plastic mesh is typically similar in pore size to the finer medium (this separator is not essential, but may be helpful depending on the buoyancy and fluidity of the media) into the finer medium (17), in this case, 5/8" X 3/8" well washed gravel, where further treatment as in medium (15) occurs, but with greater efficiency and physical filtration of suspended solids. Thence, similarly into medium (18), in 'this case, washed sand with an effective size of .80-2.00 mm and a uniformity cone coefficient of <1.5 repeating the progressive purification until arriving at medium (19), in this example, washed sand with an effective size of .50-.60 mm and a uniformity coefficient of <1.6 to the final medium (20), in this case, sand with an effective size of .35-.45 mm and a uniformity coefficient of <1.2 shown, in this case, buried in native top soil (21) sufficiently hydraulically conductive to permit unconfined radial gravity flow to disperse the purified water (22) into local shallow ground water. Sampling and gas escape ports (23) are run from the medium layer to the surface. An optional air injection (24) may be used to aerate the effluent.
In Fig. 3., the hydraulic flow and purification principles are the same as in Fig. 1, except that the flow is retained after purification by constructing an impermeably lined channel (26) to confine and guide the product through a permeable medium (20) into a specific disposal or reuse area (27). This channel can provide extra aeration, landscaping irrigation, as well as transportation. Insulation (28) and housing (29) can thermally isolate the chamber.
In Figs. 4. through 6. are perspective views of some typical chamber shapes and flows that can be used alone or in series.
In Fig. 7. is an overhead view of the specified principle being executed with discrete monomedium beds or chambers as phases, interconnected by plumbing or other connections. ' Especially selected biota may be used to innoculate the media and/or special nutrients may be added to increase treatment efficiency. Catalytic media may be used to accelerate chemical reactions.
SUBSTITUTE SUEET
_6_ ..
a5 ~r~~~
The preferr~~m~Dt3'diments and uses are described above for illustrative purposes. It is to be understood that variations and modifications or other uses lie within the scope of the following claims.
i
Claims (10)
1. An apparatus for biological purification of sewage or water comprising:
a plurity of layers of media, comprising means for support of biota, said layers of media being contained in a relatively water impermeable chamber means, and being progressively graded from a first, coarsest layer to a final, finest layer, and said layers progressively increasing in volume from said first layer to said final layer;
influent means for introducing sewage or water to be treated into said first layer; and effluent means for removing treated effluent from said final layer;
wherein said plurality of layers of media are constructed and arranged to provide passive ambient air contact at an upper surface of said layers and to provide a residence time for the water or sewage being treated of several days or weeks,
a plurity of layers of media, comprising means for support of biota, said layers of media being contained in a relatively water impermeable chamber means, and being progressively graded from a first, coarsest layer to a final, finest layer, and said layers progressively increasing in volume from said first layer to said final layer;
influent means for introducing sewage or water to be treated into said first layer; and effluent means for removing treated effluent from said final layer;
wherein said plurality of layers of media are constructed and arranged to provide passive ambient air contact at an upper surface of said layers and to provide a residence time for the water or sewage being treated of several days or weeks,
2. The apparatus of Claim 1 whereby said chamber means is shaped approximately as a cylinder or cylinder section, cone, wedge with the influent means entering said chamber at the center or apex directly into the coarsest medium layer and flowing peripherally through said progressively finer pored layers with each layer interface area thus made progressively larger to maintain constant hydraulic conductivity in finer and finer media until the treated effluent exits from the finest or final layer at the periphery,
3. The apparatus of Claim 1 wherein the upper or surface is extended horizontally in passive contact with ambient air to provide directional channeling of effluent and extra aerobic reaction,
4. The apparatus of Claim 1 wherein said chamber means comprises a plurality of discrete chambers connected together in series with each chamber containing progressively finer media,
5. The apparatus of Claim 1 wherein insulation or a housing is placed around said chamber to conserve internal heat,
6. The apparatus of Claim 1 wherein said chamber means comprises a single chamber is constructed of sculpted soil lined with an impermeable membrane, tight fabric, clay or other impermeable soil layer,
7. The apparatus of Claim 1 wherein some or all of the media are composed of open celled foam plastic, metal or gravel and sand,
8. The apparatus of Claim 1 further comprising pipe means for sampling of gas escape embedded in said media,
9. The apparatus of Claim 1 further comprising porous media separators at each layer interface area,
10. A process for biological purification of sewage or water comprising:
providing biota supported on a plurality of layers of media contained in a relatively water impermeable chamber means, said media being progressively graded from a first, coarsest layer to a final, finest layer, and said layers progressively increasing in volume from said first layer to said final layer;
introducing sewage or water to be treated into said first layer;
passing said sewage or water to be treated through each of said progressively graded layers over a residence time of several days or weeks, while providing passive ambient air contact with an upper surface of said layers; and withdrawing treated effluent from said final layer.
providing biota supported on a plurality of layers of media contained in a relatively water impermeable chamber means, said media being progressively graded from a first, coarsest layer to a final, finest layer, and said layers progressively increasing in volume from said first layer to said final layer;
introducing sewage or water to be treated into said first layer;
passing said sewage or water to be treated through each of said progressively graded layers over a residence time of several days or weeks, while providing passive ambient air contact with an upper surface of said layers; and withdrawing treated effluent from said final layer.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/404,894 | 1989-09-08 | ||
US07/404,894 US4997568A (en) | 1989-09-08 | 1989-09-08 | Process and apparatus for a biological reactor to purify water |
PCT/US1990/004635 WO1991003429A1 (en) | 1989-09-08 | 1990-08-17 | Process and apparatus for a biological reactor to purify water |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2065350A1 CA2065350A1 (en) | 1991-03-09 |
CA2065350C true CA2065350C (en) | 2000-06-20 |
Family
ID=23601474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA 2065350 Expired - Lifetime CA2065350C (en) | 1989-09-08 | 1990-08-17 | Process and apparatus for biological reactor to purify water |
Country Status (5)
Country | Link |
---|---|
US (1) | US4997568A (en) |
EP (1) | EP0490910A4 (en) |
JP (1) | JP3068645B2 (en) |
CA (1) | CA2065350C (en) |
WO (1) | WO1991003429A1 (en) |
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US6852225B1 (en) * | 1999-04-20 | 2005-02-08 | The Regents Of The University Of California | Method and apparatus to establish and optimize sedimentation and methane fermentation in primary wastewater ponds |
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-
1989
- 1989-09-08 US US07/404,894 patent/US4997568A/en not_active Expired - Lifetime
-
1990
- 1990-08-17 JP JP51191390A patent/JP3068645B2/en not_active Expired - Fee Related
- 1990-08-17 WO PCT/US1990/004635 patent/WO1991003429A1/en not_active Application Discontinuation
- 1990-08-17 CA CA 2065350 patent/CA2065350C/en not_active Expired - Lifetime
- 1990-08-17 EP EP19900912501 patent/EP0490910A4/en not_active Withdrawn
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WO1991003429A1 (en) | 1991-03-21 |
EP0490910A4 (en) | 1992-08-12 |
US4997568A (en) | 1991-03-05 |
EP0490910A1 (en) | 1992-06-24 |
JPH05500328A (en) | 1993-01-28 |
CA2065350A1 (en) | 1991-03-09 |
JP3068645B2 (en) | 2000-07-24 |
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