CA1141045A - Method and apparatus for treating waste water - Google Patents
Method and apparatus for treating waste waterInfo
- Publication number
- CA1141045A CA1141045A CA000343810A CA343810A CA1141045A CA 1141045 A CA1141045 A CA 1141045A CA 000343810 A CA000343810 A CA 000343810A CA 343810 A CA343810 A CA 343810A CA 1141045 A CA1141045 A CA 1141045A
- Authority
- CA
- Canada
- Prior art keywords
- basin
- waste water
- installations
- sludge
- biological
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/06—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
- C02F3/12—Activated sludge processes
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Activated Sludge Processes (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
The invention is concerned with a method for biologically treating waste water comprising the steps of:
(a) introducing the waste water into a biological basin;
(b) introducing an oxygen containing gas into the waste water; and (c) circulating the mixture of waste water and biological sludge upwardly through basin installation which is provided with channels comprising baffle plates spaces 2 to 20 cm apart and shaped in the form of chicanes;
characterized in that a sludge age of at least three days is reached by creating a slow circulation flow while avoiding clogging of said basin installations. The inven-tion is also concerned with the apparatus for carrying out this process which has the advantage to improve the purifi-cation action.
The invention is concerned with a method for biologically treating waste water comprising the steps of:
(a) introducing the waste water into a biological basin;
(b) introducing an oxygen containing gas into the waste water; and (c) circulating the mixture of waste water and biological sludge upwardly through basin installation which is provided with channels comprising baffle plates spaces 2 to 20 cm apart and shaped in the form of chicanes;
characterized in that a sludge age of at least three days is reached by creating a slow circulation flow while avoiding clogging of said basin installations. The inven-tion is also concerned with the apparatus for carrying out this process which has the advantage to improve the purifi-cation action.
Description
The present invention relates to a method and apparatus for treating waste water.
Methods for treating waste water in a biologi-cal basin are commonly known. They enable long contact time periods and have a great variability, but fulfill not in all cases the present and future requiremen-ts as to purification efficiency.
The main object of the invention is to remove this disadvantage and to provide an improvement of the pu-rification action.
The invention is based upon the cognition that - in usual biological basins the sludge age is too young for causing a sufficient nitrification. The heterotropic bacteria developed in young sludge are not able to do this, contrary to so-called nitrosomas and nitrobacter developed in older sludge.
It is indeed known from the German patent n
Methods for treating waste water in a biologi-cal basin are commonly known. They enable long contact time periods and have a great variability, but fulfill not in all cases the present and future requiremen-ts as to purification efficiency.
The main object of the invention is to remove this disadvantage and to provide an improvement of the pu-rification action.
The invention is based upon the cognition that - in usual biological basins the sludge age is too young for causing a sufficient nitrification. The heterotropic bacteria developed in young sludge are not able to do this, contrary to so-called nitrosomas and nitrobacter developed in older sludge.
It is indeed known from the German patent n
2.420.977, to use basin installations in biological basins, however a sufficiently great sIudge age is not reached.
The basin installations are porous foam plastics bodies which are periodically compressed and expanded to transport air and water alternately within a biological basin cons-tructed as a pressure vessel in which the space above the water surface is filled with pressurized air. Quite apart from the fact that the installation is very expensive as regards energy and its construction and can furthermore only be charged with purified waste water, due to the small pores of the basin installations there is a considerable danger of blockage , in particular since the basin instal-lations are also supposed to function as colloid collectors.The purification occurs by relaxing the pressure and there-fore happens quite automatically at least with every change of charge.
Similar consideration regarding the sludge age apply in connection with a further known method(German patent n 951.528),in which purified waste water is distri-buted from above onto a biological cleaning space which comprise~s vertical open-bottomed cells and whose lower end dips into a further purification basin. An air distributor is arranged in the further purification basin below this cleaning space. The individual cells of the biological cleaning space are flowed through from top to bottom by the waste water and the biological sludge in counter-current to the air bubbles, whereby the speed of mobility of,the bio-logical sludge is supposed to be greater than that of thewaste water. Simultaneously the waste water comes into contact with the sludge deposits collecting on the cell walls. As soon as the waste water reaches the lower end of the relevant cells the cleaning process must be terminated.
This system can only be functional when the vertical waste water flows are very'thin, that is to say the cells are very narrow. Thus one must reckon with a rapid growth of the flow ways so that a frequent cleaning is necessary and achieving old sludge deposits is impossible.
Therefore, the object of the invention are - achieved by a~process for biol'ogically treating waste water comprising the steps of:
(a) introducing the waste water into a biologi-cal basin;
(b) introducing an oxygen containing gas into the waste water; and (c) circulating the mixture of waste water and biological sludge upwardly through basin installation which is provided with channels comprising baffle plates spaces 2 to 20 cm apart and shaped in the form of chicanes;
characterized in that a sludge age of at least three days is reached by creating a slow circulation flow while avoiding clogging of said basin installations.
According to the invention, the sludge de~osi-tions on the basin installations can grow old suffic'iently , for performing their function of nitrification. The action of the heterotropic bacteria are not disturbed in any way.
Thus, two methods are running in parallel within the common biological basin, wherein two kinds of sludge are active.
Furthermore, the old sludge depositions on the basin installations raised the totalquantity oE biological sludge within the basin, e.g. by the important value of 60 percent. The waste water load can be increased accordin-gly. This is an essential supplemental advantage.
,lO The advantages of the invention are reached without essential supplemental expenditure as to energy demand and construction.
Preferably the circulation is caused by blowing in-oxygen-containing gas against the basin instal-lations. Thus one combines in an energy-saving manner the oxygen introduction with the power for the circulation currents. The same is true for the further possibility provided in accordance with the invention that the circu-lation is caused or reinforced by a drive which produces a rotary current in the basin.
The invention is also directed to a particular-ly advantageous apparatus for carrying out the above method, comprising (a) a biological basin containing waste water;
' (b) a basin installation including baffle pla~
tes spaced 2 to 20 cm apart forming channels, and shaped in the form of chicanesi and (c) aeration means for introducing oxygen in ' the waste water, said means being constructed and arranged to circulate waste water and biological sludge upwardly through the basin installations; characterized in that the sludge is aged of at least three (3) days and is reached by creating a slow circulation flow while avoiding clogging of the installations. Preferably, the walls of the chan-nels are struct,ured to achieve a large surface. This offers the possibiIity to accumulate high quantities of old biological sludge.
A further advantageous feature of the appara-tus in accordance with the invention resides in the fact that the channels lead substantially from the bot-tom to the top through the basin installations and that below the latter a device for blowing in gas is arranged. The gas serving to introduce the oxygen climbs upwardly and drives the water through the channels of the basin installations.
In addition to this, or alternatively, there is in accordance with the invention the possibility that gasifying rotors are provided above the region of the basin installations. Differing from this, other, and if required mechanical, rotation devices are possible which for instance cause horizontal currents through the basin installations.
If one works with gas injection the appara-tus in accordance with the invention can be further charac-terized in that the channels have bends in the form of chicanes. The contact times between gas,-sludge and waste water are thereby increased. In order to make maintenance work possible in a simple manner, in particuiar the periodi-cally necessary cleaning, the basin installations are pre-ferably adapted to be lifted out of the waste water. Sludge deposits that have become too old can then fall out of the basin installations under the effect of gravity.
The invention will be described in more detail in the following with reference to preerred embodiments in conjunction with the accompanying drawings. The drawings sho~s in: -Figure 1 a cross-section through biological basin in accordance with the invention;
Figure 2 the plan view belonging to figure 1;
Figure 3 a cross-section through a modified embodiment~
Figure 4 the plan view belonging to figure 3;
Figure 5 a crcss-section through a further modified embodiment r-Figure 6 the plan ~iew belonging to figure 5, Figure 7 a section along the line VII-VII in figure 6.
In accordance with figure 1, a biological basin 1 with an open water surface 2 is provided to which the invention is applicable with particular advantage.
Within the biological basin and below the water surface are situated two basin installations 3, of which -one has been left out in figure 2. The raw waste water containing the biological sludge circulates through the basin installations as indicated with the flow lines in figure 1. Beneath each basin installations 3 there is situated an associated device 4 for blowing in oxygen con-taining gas. The devices 4 are supplied from a gas pipe 5 and constitute the drive for the circulation currents.
Biological sludge which reaches an age of at least three days, preferably of more than twenty days, accumulates on the basin installations 3. Accordingly one works with two different biological sludges, namely of different ages.
According to figure 2 the basin installations 3 are divided by walls 6 into individual channels, and these walls 6 are structured as to provide maximum surface area for sludge deposition.
In the modification shown in figures 3 and 4 a gasifying rotor 7 is provided which is driven by a motor 8. The gasifying motor replaces the device 4 described previously for blowing in the gas.
~ The modified embodiment shown in figures 5 and 6 corresponds in its operation to the arrangement shown in figures 1 and 2 with the difference that four basin instal-lations 3 are present which produce correspondingly symme-trical circulating flows.
Figure 7 show that the channels formed by t,he walls 6 have bends in the form of chicanes. The channels ~ 5 --L _ v~
extend substantially vertically.
As an alternative to this, substantially hori-zontally extending channels with corresponding drives to produce the circulation currents are possible.
The width of the illustrated channels lies preferably between two and twenty centimetres, in particular between three and nine centimetres.
The basin installations 3 can be fixedly arran-ged within the biological basin 1. It is however more advantageous to be able to lift the basin installations out of the waste water to carry out maintenance and cleaning work.
The basin installations are porous foam plastics bodies which are periodically compressed and expanded to transport air and water alternately within a biological basin cons-tructed as a pressure vessel in which the space above the water surface is filled with pressurized air. Quite apart from the fact that the installation is very expensive as regards energy and its construction and can furthermore only be charged with purified waste water, due to the small pores of the basin installations there is a considerable danger of blockage , in particular since the basin instal-lations are also supposed to function as colloid collectors.The purification occurs by relaxing the pressure and there-fore happens quite automatically at least with every change of charge.
Similar consideration regarding the sludge age apply in connection with a further known method(German patent n 951.528),in which purified waste water is distri-buted from above onto a biological cleaning space which comprise~s vertical open-bottomed cells and whose lower end dips into a further purification basin. An air distributor is arranged in the further purification basin below this cleaning space. The individual cells of the biological cleaning space are flowed through from top to bottom by the waste water and the biological sludge in counter-current to the air bubbles, whereby the speed of mobility of,the bio-logical sludge is supposed to be greater than that of thewaste water. Simultaneously the waste water comes into contact with the sludge deposits collecting on the cell walls. As soon as the waste water reaches the lower end of the relevant cells the cleaning process must be terminated.
This system can only be functional when the vertical waste water flows are very'thin, that is to say the cells are very narrow. Thus one must reckon with a rapid growth of the flow ways so that a frequent cleaning is necessary and achieving old sludge deposits is impossible.
Therefore, the object of the invention are - achieved by a~process for biol'ogically treating waste water comprising the steps of:
(a) introducing the waste water into a biologi-cal basin;
(b) introducing an oxygen containing gas into the waste water; and (c) circulating the mixture of waste water and biological sludge upwardly through basin installation which is provided with channels comprising baffle plates spaces 2 to 20 cm apart and shaped in the form of chicanes;
characterized in that a sludge age of at least three days is reached by creating a slow circulation flow while avoiding clogging of said basin installations.
According to the invention, the sludge de~osi-tions on the basin installations can grow old suffic'iently , for performing their function of nitrification. The action of the heterotropic bacteria are not disturbed in any way.
Thus, two methods are running in parallel within the common biological basin, wherein two kinds of sludge are active.
Furthermore, the old sludge depositions on the basin installations raised the totalquantity oE biological sludge within the basin, e.g. by the important value of 60 percent. The waste water load can be increased accordin-gly. This is an essential supplemental advantage.
,lO The advantages of the invention are reached without essential supplemental expenditure as to energy demand and construction.
Preferably the circulation is caused by blowing in-oxygen-containing gas against the basin instal-lations. Thus one combines in an energy-saving manner the oxygen introduction with the power for the circulation currents. The same is true for the further possibility provided in accordance with the invention that the circu-lation is caused or reinforced by a drive which produces a rotary current in the basin.
The invention is also directed to a particular-ly advantageous apparatus for carrying out the above method, comprising (a) a biological basin containing waste water;
' (b) a basin installation including baffle pla~
tes spaced 2 to 20 cm apart forming channels, and shaped in the form of chicanesi and (c) aeration means for introducing oxygen in ' the waste water, said means being constructed and arranged to circulate waste water and biological sludge upwardly through the basin installations; characterized in that the sludge is aged of at least three (3) days and is reached by creating a slow circulation flow while avoiding clogging of the installations. Preferably, the walls of the chan-nels are struct,ured to achieve a large surface. This offers the possibiIity to accumulate high quantities of old biological sludge.
A further advantageous feature of the appara-tus in accordance with the invention resides in the fact that the channels lead substantially from the bot-tom to the top through the basin installations and that below the latter a device for blowing in gas is arranged. The gas serving to introduce the oxygen climbs upwardly and drives the water through the channels of the basin installations.
In addition to this, or alternatively, there is in accordance with the invention the possibility that gasifying rotors are provided above the region of the basin installations. Differing from this, other, and if required mechanical, rotation devices are possible which for instance cause horizontal currents through the basin installations.
If one works with gas injection the appara-tus in accordance with the invention can be further charac-terized in that the channels have bends in the form of chicanes. The contact times between gas,-sludge and waste water are thereby increased. In order to make maintenance work possible in a simple manner, in particuiar the periodi-cally necessary cleaning, the basin installations are pre-ferably adapted to be lifted out of the waste water. Sludge deposits that have become too old can then fall out of the basin installations under the effect of gravity.
The invention will be described in more detail in the following with reference to preerred embodiments in conjunction with the accompanying drawings. The drawings sho~s in: -Figure 1 a cross-section through biological basin in accordance with the invention;
Figure 2 the plan view belonging to figure 1;
Figure 3 a cross-section through a modified embodiment~
Figure 4 the plan view belonging to figure 3;
Figure 5 a crcss-section through a further modified embodiment r-Figure 6 the plan ~iew belonging to figure 5, Figure 7 a section along the line VII-VII in figure 6.
In accordance with figure 1, a biological basin 1 with an open water surface 2 is provided to which the invention is applicable with particular advantage.
Within the biological basin and below the water surface are situated two basin installations 3, of which -one has been left out in figure 2. The raw waste water containing the biological sludge circulates through the basin installations as indicated with the flow lines in figure 1. Beneath each basin installations 3 there is situated an associated device 4 for blowing in oxygen con-taining gas. The devices 4 are supplied from a gas pipe 5 and constitute the drive for the circulation currents.
Biological sludge which reaches an age of at least three days, preferably of more than twenty days, accumulates on the basin installations 3. Accordingly one works with two different biological sludges, namely of different ages.
According to figure 2 the basin installations 3 are divided by walls 6 into individual channels, and these walls 6 are structured as to provide maximum surface area for sludge deposition.
In the modification shown in figures 3 and 4 a gasifying rotor 7 is provided which is driven by a motor 8. The gasifying motor replaces the device 4 described previously for blowing in the gas.
~ The modified embodiment shown in figures 5 and 6 corresponds in its operation to the arrangement shown in figures 1 and 2 with the difference that four basin instal-lations 3 are present which produce correspondingly symme-trical circulating flows.
Figure 7 show that the channels formed by t,he walls 6 have bends in the form of chicanes. The channels ~ 5 --L _ v~
extend substantially vertically.
As an alternative to this, substantially hori-zontally extending channels with corresponding drives to produce the circulation currents are possible.
The width of the illustrated channels lies preferably between two and twenty centimetres, in particular between three and nine centimetres.
The basin installations 3 can be fixedly arran-ged within the biological basin 1. It is however more advantageous to be able to lift the basin installations out of the waste water to carry out maintenance and cleaning work.
Claims (7)
1. A method for biologically treating waste water comprising the steps of:
(a) introducing the waste water into a biological basin, (b) introducing an oxygen containing gas into the waste water; and (c) circulating the mixture of waste water and biological sludge upwardly through basin installation which is provided with channels comprising baffle plates spaces 2 to 20 cm apart and shaped in the form of chicanes, characterized in that a sludge age of at least three days is reached by creating a slow circulation flow while avoiding clogging of said basin installations.
(a) introducing the waste water into a biological basin, (b) introducing an oxygen containing gas into the waste water; and (c) circulating the mixture of waste water and biological sludge upwardly through basin installation which is provided with channels comprising baffle plates spaces 2 to 20 cm apart and shaped in the form of chicanes, characterized in that a sludge age of at least three days is reached by creating a slow circulation flow while avoiding clogging of said basin installations.
2. Method according to claim 1, characterized in that the sludge age reaches more than 20 days.
3. Method according to claim 1, characterized in that the circulation through the basin installations is provided or increased by a drive for creating a revolution flow throughout the basin.
4. An apparatus for carrying out the method of claim 1, comprising:
(a) a biological basin containing waste water;
(b) a basin installation including baffle plates spaces 2 to 20 cm apart forming channels, and shaped in the form of chicanes, and (c) aeration means for introducing oxygen in the waste water, said means being constructed and ar-ranged to circulate waste water and biological sludge upwardly through the basin installations; characterized in that the sludge is aged of at least three (3) days. and is reached by creating a slow circulation flow while avoiding clogging of the installations.
(a) a biological basin containing waste water;
(b) a basin installation including baffle plates spaces 2 to 20 cm apart forming channels, and shaped in the form of chicanes, and (c) aeration means for introducing oxygen in the waste water, said means being constructed and ar-ranged to circulate waste water and biological sludge upwardly through the basin installations; characterized in that the sludge is aged of at least three (3) days. and is reached by creating a slow circulation flow while avoiding clogging of the installations.
5. Apparatus according to claim 4, charac-terized in that it further comprises aerating rotors above the vicinity of said basin installations.
6. Apparatus according to claim 4, charac-terized in that the baffle plates of the channels are constructed and arranged to maximise surface area.
7. Apparatus according to claim 4, charac-terized in that the basin installations are removable.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2901509.6 | 1979-01-16 | ||
| DE2901509A DE2901509C2 (en) | 1979-01-16 | 1979-01-16 | Device for the biological treatment of waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1141045A true CA1141045A (en) | 1983-02-08 |
Family
ID=6060665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000343810A Expired CA1141045A (en) | 1979-01-16 | 1980-01-16 | Method and apparatus for treating waste water |
Country Status (13)
| Country | Link |
|---|---|
| EP (1) | EP0022809B1 (en) |
| JP (1) | JPS57500457A (en) |
| AT (1) | AT388367B (en) |
| BE (1) | BE881188A (en) |
| CA (1) | CA1141045A (en) |
| CH (1) | CH644569A5 (en) |
| DE (1) | DE2901509C2 (en) |
| ES (1) | ES487751A1 (en) |
| GB (1) | GB2053183B (en) |
| IT (1) | IT1145426B (en) |
| NL (1) | NL8020006A (en) |
| SE (1) | SE449355B (en) |
| WO (1) | WO1980001484A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3244944A1 (en) * | 1982-12-04 | 1984-06-14 | Universal Gesellschaft für Umwelttechnik mbH, 2410 Mölln | KLAERBECKEN FOR THE BIOLOGICAL WASTEWATER CLEANING |
| DE3327774A1 (en) * | 1983-08-02 | 1985-02-14 | Linde Ag, 6200 Wiesbaden | METHOD AND DEVICE FOR BIOLOGICAL WASTE WATER TREATMENT |
| DE3415756C2 (en) * | 1984-04-27 | 1986-11-13 | Dr.-Ing. Werner Weber Ingenieur-Gesellschaft mbH, 7530 Pforzheim | Method and device for the biological treatment of waste water |
| DE3619757A1 (en) * | 1986-06-12 | 1987-12-17 | Metz Mannheim Gmbh | FISH BASIN FOR INTENSIVE FISH Fattening, AND METHOD FOR OPERATING SUCH A FISH BASIN |
| DE3829873A1 (en) * | 1988-09-02 | 1990-03-15 | Bayer Ag | FLUID BED REACTOR FOR BIOLOGICAL WASTE WATER TREATMENT |
| DE3908779C1 (en) * | 1989-03-17 | 1990-07-12 | Leonhard Dipl.-Ing. Fuchs | Lagoon installation |
| DE4232361A1 (en) * | 1992-09-26 | 1994-03-31 | Ieg Ind Engineering Gmbh | Sensitive liq. transport device - provides suction lift action e.g. in biological clarification plant |
| NL9302260A (en) * | 1993-12-24 | 1995-07-17 | Stork Friesland Bv | Membrane bioreactor with gas-lift system. |
| CN111556780B (en) | 2018-01-08 | 2021-08-27 | 克兹二世怡人合资有限公司 | Children toy with capacitive touch interactivity |
| USD985677S1 (en) * | 2021-01-11 | 2023-05-09 | Kids Ii Hape Joint Venture Limited | Toy guitar |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1584951A1 (en) * | 1966-12-03 | 1969-09-25 | H Geiger Maschf | Process for the biological purification of wastewater using immersion bodies |
| DE1584952A1 (en) * | 1966-12-21 | 1969-11-13 | Masche Dipl Ing Georg | Method and device for compressed air ventilation of waste water |
| SE344581B (en) * | 1967-03-17 | 1972-04-24 | Krueger As I | |
| US3968034A (en) * | 1970-12-02 | 1976-07-06 | Jerzy Tymoszczuk | Process and apparatus for treating wastes by a combined activated sludge and biological filter bed |
| US3968304A (en) * | 1973-06-14 | 1976-07-06 | The General Tire & Rubber Company | Polyester bonded to rubber and method for making the same |
| DE2530722C2 (en) * | 1975-07-10 | 1984-05-24 | Wolf-Rüdiger Dipl.-Ing. 7000 Stuttgart Müller | Process for nitrification, demanganization and iron removal from contaminated water |
| US4093539A (en) * | 1976-05-12 | 1978-06-06 | Autotrol Corporation | Activated sludge treatment of wastewater |
-
1979
- 1979-01-16 DE DE2901509A patent/DE2901509C2/en not_active Expired
-
1980
- 1980-01-15 IT IT4760280A patent/IT1145426B/en active
- 1980-01-16 JP JP50023880A patent/JPS57500457A/ja active Pending
- 1980-01-16 BE BE0/198996A patent/BE881188A/en not_active IP Right Cessation
- 1980-01-16 GB GB8029325A patent/GB2053183B/en not_active Expired
- 1980-01-16 NL NL8020006A patent/NL8020006A/en not_active Application Discontinuation
- 1980-01-16 CA CA000343810A patent/CA1141045A/en not_active Expired
- 1980-01-16 CH CH734680A patent/CH644569A5/en not_active IP Right Cessation
- 1980-01-16 WO PCT/DE1980/000006 patent/WO1980001484A1/en active IP Right Grant
- 1980-01-16 ES ES487751A patent/ES487751A1/en not_active Expired
- 1980-01-16 AT AT900280A patent/AT388367B/en not_active IP Right Cessation
- 1980-07-29 EP EP19800900152 patent/EP0022809B1/en not_active Expired
- 1980-09-16 SE SE8006491A patent/SE449355B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57500457A (en) | 1982-03-18 |
| DE2901509C2 (en) | 1982-06-03 |
| SE8006491L (en) | 1980-09-16 |
| GB2053183B (en) | 1983-09-21 |
| EP0022809B1 (en) | 1984-09-19 |
| SE449355B (en) | 1987-04-27 |
| NL8020006A (en) | 1980-11-28 |
| IT1145426B (en) | 1986-11-05 |
| DE2901509A1 (en) | 1980-07-17 |
| IT8047602A0 (en) | 1980-01-15 |
| ES487751A1 (en) | 1980-06-16 |
| AT388367B (en) | 1989-06-12 |
| ATA900280A (en) | 1988-11-15 |
| WO1980001484A1 (en) | 1980-07-24 |
| GB2053183A (en) | 1981-02-04 |
| CH644569A5 (en) | 1984-08-15 |
| EP0022809A1 (en) | 1981-01-28 |
| BE881188A (en) | 1980-05-16 |
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