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US4676907A
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Biological filtration process
Assignee: Individual
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Filing: 1985-06-03
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Granted: 1987-06-30
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Expires: 2005-06-03
Abstract
Abstract Biological stable articles are described which are especially useful as bed materials for treating waste water. Preferred articles are charred rice hulls which comprise silica and carbon.
Inventors
- 👤 George C. Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:59
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/08; C02F3/085; C02F3/087; C02F1/00; C02F1/28; C02F1/283; C02F3/04; C02F3/06; C02F3/10; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
158 words
A process for biologically removing contaminants from waste water containing organic compounds and ammonia comprising the steps of: (a) providing a bed comprising a plurality of biologically stable articles comprising charred rice hulls which have been charred at a temperature in the range of about 1550° F. to 1650° F., each of which has a wall shaped in such a manner that it defines a cavity which is open on one side, wherein said cavity is adapted to retain said water therein when said water flows over the surface of each said article, wherein each said article is adapted to enable dissolved gases and solids in said flowing water to diffuse into said retained water in said cavity, wherein anaerobic microbiology predominates in said retained water, and wherein aerobic microbiology predominates in said flowing water; (b) passing said water containing said contaminants over said bed for a period of time sufficient to remove said contaminants from said water.
Claim 2
Dependent Claim
158 words
A process for biologically removing contaminants from waste water containing organic compounds and ammonia comprising the steps of: (a) providing a bed comprising a plurality of biologically stable articles comprising charred rice hulls which have been charred at a temperature in the range of about 1550° F. to 1650° F., each of which has a wall shaped in such a manner that it defines a cavity which is open on one side, wherein said cavity is adapted to retain said water therein when said water flows over the surface of each said article, wherein each said article is adapted to enable dissolved gases and solids in said flowing water to diffuse into said retained water in said cavity, wherein anaerobic microbiology predominates in said retained water, and wherein aerobic microbiology predominates in said flowing water; (b) passing said water containing said contaminants over said bed for a period of time sufficient to remove said contaminants from said water.
Claim 3
Dependent Claim
16 words
A process in accordance with claim 1, wherein said waste water flows upwardly through said bed.
Claim 4
Dependent Claim
16 words
A process in accordance with claim 1, wherein said waste water flows downwardly through said bed.
Claim 5
Dependent Claim
12 words
A process in accordance with claim 2, wherein said bed is fluidized.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |