Process for high-load treatment of carbohydrate-containing waste water
CA 2000982 C · Owner: Research Association Of Biotechnology For Organic Fertilizer · Inventors: Matsumaru, Michiyo; Chigusa, Kaoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1), A process for high-load treatment of carbohydrate-containing waste water comprises the steps of separating a yeast appearing in the waste water subjecting the separated yeast to large-quantity culture and treating the waste water by a high-load operation using the cultured yeast as a seed fungus under the conditions of a volume load of 10 to 80 kg-BOD/m3 day and a yeast load of 1.0 to 5.0 kg-BOD/kg-yeastday whereby it, is possible to treat the high-concentration waste water efficiently with a small volume for treatment. The quantity of air required of a diffuser system blower may be 0.15 to 0.60 kg-O2/kg-BOD-removed, the value being 1/3 to 2/3 times that in a general activated sludge …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed October 18, 1989 and granted August 23, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.