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| (12) Patent Application: | (11) CA 2238581 |
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| (54) English Title: | METHOD FOR THE ENHANCEMENT OF GRANULATION OF ANAEROBIC SLUDGE |
| (54) French Title: | METHODE POUR AMELIORER LA GRANULATION DE BOUES ANAEROBIES |
| Status: | Dead |
| (51) International Patent Classification (IPC): |
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| (72) Inventors : |
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| (73) Owners : |
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| (71) Applicants : |
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| (74) Agent: | ANDERSON, J. WAYNE |
| (74) Associate agent: | |
| (45) Issued: | |
| (22) Filed Date: | 1998-05-22 |
| (41) Open to Public Inspection: | 1998-11-23 |
| Availability of licence: | N/A |
| (25) Language of filing: | English |
| Patent Cooperation Treaty (PCT): | No |
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| (30) Application Priority Data: | ||||||
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The invention disclosed relates to a method for enhancing the granulation rate
of suspended anaerobic sludge. The method comprises the incremental additions
to the sludge over a period of time of a cationic synthetic e.g.
polyacrylamide polymer or a natural e.g. chitosan polymer. The method was
performed in laboratory-scale upflow anaerobic sludge bed (UASB)-like reactors
operated under similar conditions over a period of 5 weeks. A total of 4
injections was carried out, during the entire course of this study. The
results showed that supplementation of the reactors with polymers, either the
natural or the synthetic, enhanced the granulation compared to that in the
control reactors (without the use of polymers). The polymers did not cause any
inhibition to biomass activity. Furthermore, the granules specific activities
were enhanced in the reactors supplemented with both polymers compared to
those in the control reactors.
L'invention divulguée concerne une méthode pour améliorer la vitesse de granulation de boues anaérobies en suspension. La méthode comprend l'addition à la boue, par étapes, au cours d'une certaine période, d'un polymère cationique synthétique (p. ex., polyacrylamide) ou d'un polymère naturel (p. ex., chitosane). La méthode a été utilisée à l'échelle du laboratoire, avec des réacteurs de type lit de boues expansées (UASB), opérés dans des conditions similaires pendant une période de 5 semaines. En tout, quatre injections ont été effectuées au cours de la durée totale de cette étude. Les résultats montrent que l'addition de polymères, naturel ou synthétique, dans les réacteurs, améliore la granulation, comparativement à celle observée dans des réacteurs témoins (sans utilisation de polymères). Les polymères n'ont provoqué aucune inhibition de l'activité de la biomasse. De plus, les activités spécifiques des granules étaient améliorées dans les réacteurs auxquels on avait ajouté les deux polymères, comparativement à celles dans les réacteurs témoins.
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
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| Title | Date |
|---|---|
| Forecasted Issue Date | Unavailable |
| (22) Filed | 1998-05-22 |
| (41) Open to Public Inspection | 1998-11-23 |
| Dead Application | 2001-05-22 |
| Abandonment Date | Reason | Reinstatement Date |
|---|---|---|
| 2000-05-23 | FAILURE TO PAY APPLICATION MAINTENANCE FEE |
| Fee Type | Anniversary Year | Due Date | Amount Paid | Paid Date |
|---|---|---|---|---|
| Application Fee | $300.00 | 1998-05-22 | ||
| Registration of a document - section 124 | $0.00 | 1998-08-05 |
Note: Records showing the ownership history in alphabetical order.
| Current Owners on Record |
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| NATIONAL RESEARCH COUNCIL OF CANADA |
| Past Owners on Record |
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| EL-MAMOUNI, RACHID |
| GUIOT, SERGE R. |
| LEDUC, ROLAND |
