US4721585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the biological treatment of sewage
Assignee: UNIVERSITA' DEGLI STUDI DI PARMA A CORP OF ITALY
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Filing: 1986-01-24
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Granted: 1988-01-26
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Expires: 2006-01-24
Abstract
Abstract A process is disclosed for the biological treatment of sewage, which envisages the use of raw cellulosic materials brought into contact with the fouled water in the presence of cellulose-devouring micro-organisms, and is centered particularly on separation of the sewage's nitrogen and phosphorus content.
Inventors
- 👤 Ulderico Melchiorri Santolini
- 👤 Roberto Antonietti
- 👤 Pierluigi Viaroli
- 👤 Caterina Della Sala Merigo
- 👤 Gianpaola Malara
- 👤 Mario Contesini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:46
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/1226; C02F3/28; C02F3/2806; C02F3/34; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/903; Y10S210/906
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
Process for the biological treatment and purification of sewage water containing phosphorus and nitrogen pollutants comprising the steps of contacting the sewage water with cellulose materials under aerobic conditions for a predetermined length of time, in the presence of cellulose-devouring heterotrophic micro-organisms, to trigger heterotrophic decomposition and absorption of nitrogen and phosphorus, and separating the sewage water from the cellulose materials and the micro-organisms, to obtain treated water depleted of said phosphorus and nitrogen pollutants.
Claim 2
Dependent Claim
75 words
Process for the biological treatment and purification of sewage water containing phosphorus and nitrogen pollutants comprising the steps of contacting the sewage water with cellulose materials under aerobic conditions for a predetermined length of time, in the presence of cellulose-devouring heterotrophic micro-organisms, to trigger heterotrophic decomposition and absorption of nitrogen and phosphorus, and separating the sewage water from the cellulose materials and the micro-organisms, to obtain treated water depleted of said phosphorus and nitrogen pollutants.
Claim 3
Dependent Claim
20 words
Process as in claim 1, wherein the cellulose materials are shredded or ground or similarly reduced to a fine consistency.
Claim 4
Dependent Claim
24 words
Process as in claim 2, wherein the size of shredded, ground or similarly reduced particles of cellulose matter ranges between 25 and 300 μm.
Claim 5
Dependent Claim
18 words
Process as in claim 1 or 2, wherein the cellulose materials are utilized in their natural raw state.
Claim 6
Dependent Claim
24 words
Process as in claim 1, wherein the quantity of cellulose materials utilized represents approximately 40 to 60% of total solids suspended in the sewage.
Claim 7
Dependent Claim
24 words
Process as in claim 1, wherein the quantity of cellulose materials utilized is from 200 to 300% of total solids suspended in the sewage.
References Cited (Backward Citations)
US3933627A
Cited
US4039438A
Cited
JPS5398305A
Cited
FR2476629A2
Cited
US4494975A
Cited
US4510243A
Cited
JPS5874186A
Cited
US4461708A
Cited
US4597872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |