US4348285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating liquid agricultural wastes
Assignee: Forschungszentrum Jülich
•
Filing: 1981-02-27
•
Granted: 1982-09-07
•
Expires: 2001-02-27
Abstract
Abstract Purification of liquid agricultural wastes, such as, in particular, liquidanure, by means of an algae/bacteria mixture culture and a subsequent rotifer culture in a separate stage. The pH-value of the algae/bacteria mixture culture is controlled, especially by the waste water charging thereof, in such a way that a multiplication of rotifers in this stage is inhibited or precluded. The algae/bacteria mixture culture preferably occurs in shallow open air ponds for a period of time which depends upon the temperature and can amount to three to six days at a mean temperature of approximately 18° C. The hold time of the algae/bacteria suspension which is in the rotifer container and is adjusted to a pH of 6 to 8 can range from two to four days at a temperature of approximately 20° C. A waste water treatment plant or system for the foregoing includes at least one algae/bacteria mixture culture reservoir and at least one rotifer reactor.
Inventors
- 👤 Joost Groeneweg
- 👤 Manfred Schluter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:46
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/121; C02F3/32; C02F3/34; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y02W10/30; Y02W10/37
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
149 words
A method of treating agricultural waste water which comprises the following sequential steps: anaerobically pretreating said waste water; subjecting said anaerobically treated waste water to an algae/bacteria mixture culture in a shallow open air pond for approximately 3 to 6 days at a mean temperature of about 18° C.; controlling and maintaining the pH of said algae/bacteria mixture culture in said pond to a value of at least 8.5 and above to thereby prevent the multiplication of rotifers therein, and to obtain an algae/bacteria suspension; supplying said algae/bacteria suspension for removal of the algae/bacteria to an aerated rotifer breeding reactor having a rotifer culture therein; holding said algae/bacteria suspension in said reactor for approximately 2 to 4 days at a mean temperature of about 20° C. and a pH of 6 to 8 for rotifer multiplication; separating said rotifers from the thusly treated suspension to obtain a purified water.
Claim 2
Independent Claim
149 words
A method of treating agricultural waste water which comprises the following sequential steps: anaerobically pretreating said waste water; subjecting said anaerobically treated waste water to an algae/bacteria mixture culture in a shallow open air pond for approximately 3 to 6 days at a mean temperature of about 18° C.; controlling and maintaining the pH of said algae/bacteria mixture culture in said pond to a value of at least 8.5 and above to thereby prevent the multiplication of rotifers therein, and to obtain an algae/bacteria suspension; supplying said algae/bacteria suspension for removal of the algae/bacteria to an aerated rotifer breeding reactor having a rotifer culture therein; holding said algae/bacteria suspension in said reactor for approximately 2 to 4 days at a mean temperature of about 20° C. and a pH of 6 to 8 for rotifer multiplication; separating said rotifers from the thusly treated suspension to obtain a purified water.
Claim 3
Dependent Claim
24 words
A method according to claim 1, in which said algae/bacteria mixture culture is based on Scenedesmus falcatus, and said rotifer culture is Brachionus rubens.
Claim 4
Dependent Claim
17 words
A method according to claim 1, wherein the waste water is liquid manure obtained during livestock breeding.
Claim 5
Dependent Claim
23 words
A method according to claim 3, which includes the step of diluting said liquid manure with water by a ratio of approximately 1:20.
Claim 6
Dependent Claim
23 words
A method according to claim 1, wherein the algae/bacteria mixture culture in said shallow open air pond is subjected to slight turning over.
Claim 7
Dependent Claim
19 words
A method according to claim 1, wherein the rotifers are produced in said reactor in the absence of light.
Claim 8
Dependent Claim
13 words
A method according to claim 1, wherein the rotifers are separated by screening.
Claim 9
Dependent Claim
17 words
A method according to claim 1, which includes the step of continuously partially recycling said separated rotifers.
Claim 10
Dependent Claim
30 words
A method according to claim 8, which includes the step of subjecting the liquid remaining after said step of separating said rotifers to a second rotifer culture which digests ciliates.
Claim 11
Dependent Claim
18 words
A method according to claim 9, which includes the step of using Epiphanes senta as said second culture.
Claim 12
Dependent Claim
25 words
A method according to claim 1, which includes the step of freeing said algae/bacteria suspension prior to supplying said suspension to said rotifer breeding reactor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |