Method of treating waste water and equipment therefor
CA 1307059 C · Owner: Iwahori, Keisuke · Inventors: Iwahori, Keisuke; Fujiu, Masao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the method of treating high-concentration organic waste water in dependence upon microorganism waste water is first anaerobically treated in an anaerobic operation tank in dependence upon anaerobic bacteria groups and methane bacteria groups; in the second step the waste water is further aerobically treated repeatedly in an aerobic operation tank, and an organic substance as hydrogen donor (raw waste water) is supplied to the aerobic operation tank before the succeeding aerobic treatment; in the third step, ozone treatment is effected to decolor the treated water. Two seed bacteria culture tanks for sludge bacteria and methane bacteria are provided separately to supply bacteria to the …
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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
- Granted September 1, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 2009.
- 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
Timeline From CIPO dates
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.