US3607736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating organic waste water
Assignee: Kurita Water Industries Ltd
•
Filing: 1969-03-21
•
Granted: 1971-09-21
•
Expires: 1989-03-21
Abstract
Abstract A method of treating organic waste water which comprises the steps of bringing activated sludge consisting mainly of denitrifying bacteria into contact with organic waste water in the presence of nitrate ions or nitrite ions, keeping said waste water in an anaerobic state and destroying the decomposable organic matters contained in the waste water by virtue of the nitrate respiration of said denitrifying sludge.
Inventors
- 👤 Yusho Miyaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:24
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; C02F3/2806; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/903
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
25 words
A method according to claim 1, wherein organic waste water is mixed with said ions and is then brought into contact with said activated sludge.
Claim 2
Dependent Claim
28 words
A method according to claim 1, wherein organic waste water is mixed with waste water containing said ions and then is brought into contact with said activated sludge.
Claim 3
Dependent Claim
21 words
A method according to claim 1, wherein organic waste water originally containing said ions is brought into contact with activated sludge.
Claim 4
Dependent Claim
30 words
A method according to claim 1, wherein the pH of said waste water and added ions is maintained in the range of about 7-9 to thereby treat organic waste water.
Claim 5
Dependent Claim
32 words
A method as defined in claim 1 wherein the contact between said activated sludge and said organic waste water is effected by mixing organic waste water with activated sludge in a tank.
Claim 6
Dependent Claim
37 words
A method as defined in claim 1 wherein the contact between said activated sludge and said organic waste water is effected by causing organic waste water to pass upwardly through activated sludge layer formed within a vessel.
Claim 7
Dependent Claim
24 words
A method according to claim 7, wherein said activated sludge layer consists of packing material whose surface is covered with activated sludge adhered thereto.
Claim 8
Dependent Claim
16 words
A method according to claim 7, wherein said activated sludge layer consists of a sludge blanket.
Claim 9
Dependent Claim
40 words
A method according to claim 1, wherein the quantity of nitrate or nitrite ions mixed in the waste water is in excess of about 0.5 kg. in terms of oxygen per 1 kg. of B.O.D. of the waste water treated.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |