US4119495A
Expired / Lapsed
US
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Method for processing activated sludge into useful products
Assignee: Individual
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Filing: 1977-01-21
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Granted: 1978-10-10
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Expires: 1997-01-21
Abstract
Abstract A method for processing activated sludge into useful products comprises hydrolysis of activated sludge at a pH of 0.01 to 6.0 at a temperature of 50° to 150° C with subsequent separation of formed water-soluble protein, carbohydrate and mineral substances and vitamins, and/or alkaline extraction of the initial activated sludge at a pH of 9 to 13 at a temperature of 40° to 90° C with subsequent separation of proteins from the extract. The invention makes it possible to simultaneously obtain useful products and solve the problem of utilization of activated sludge formed in great excess in biological purification of effluents, thereby ensuring intensification of purification of effluents, improvement of the quality of the purified water and decrease in the pollution of the environment.
Inventors
- 👤 Vasily Dmitrievich Belyaev
- 👤 Sergei Vladimirovich Chepigo
- 👤 Nina Ivanovna Korotchenko
- 👤 Alexandr Nikolaevich Mezentsev
- 👤 Olga Vasilievna Samokhina
- 👤 Alexandra Leonidovna Krasinskaya
- 👤 Vadim Nikolaevich Timkin
- 👤 Yaroslav Yaroslavovich Shkop
- 👤 Alexei Olegovich Colubev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:03
CPC Classifications
A; A23; A23J; A23J1/00; A23J1/001; A23K; A23K10/00; A23K10/30; A23K10/37; C; C12; C12N; C12N1/00; C02; C02F; C02F1/00; C02F1/66; C02F11/00; C02F11/18; Y; Y02; Y02P; Y02P60/00; Y02P60/80; Y02P60/87; Y10; Y10S; Y10S435/00; Y10S435/804; Y10S435/8215; Y10S435/911; Y10S435/921; Y10S530/00; Y10S530/859
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
A method for processing activated sludge into useful products, which comprises subjecting a first portion of said activated sludge to hydrolysis at a pH of 0.01 to 6.0 and a temperature of 50° to 150° C., thus forming a solution of water soluble proteins, carbohydrates, mineral substances and vitamins, and a first precipitate which is acid, separating said solution of water-soluble proteins, carbohydrates, mineral substances and vitamins from said first precipitate, subjecting a second portion of said activated sludge to alkaline extraction at a pH of 9 to 13 and a temperature of 40° to 90° C., thus forming a solution of soluble proteins and another precipitate which is alkaline and separating said solution of soluble proteins from said other precipitate.
Claim 2
Independent Claim
121 words
A method for processing activated sludge into useful products, which comprises subjecting a first portion of said activated sludge to hydrolysis at a pH of 0.01 to 6.0 and a temperature of 50° to 150° C., thus forming a solution of water soluble proteins, carbohydrates, mineral substances and vitamins, and a first precipitate which is acid, separating said solution of water-soluble proteins, carbohydrates, mineral substances and vitamins from said first precipitate, subjecting a second portion of said activated sludge to alkaline extraction at a pH of 9 to 13 and a temperature of 40° to 90° C., thus forming a solution of soluble proteins and another precipitate which is alkaline and separating said solution of soluble proteins from said other precipitate.
Claim 3
Dependent Claim
29 words
The method of claim 1, wherein the hydrolysis of the activated sludge is conducted at a pH of 0.01 to 6.0 and a temperature of 80° to 150° C..
Claim 4
Dependent Claim
46 words
The method of claim 1, wherein the alkali extraction is conducted at a pH of 9 to 13 and a temperature of 80° to 90° C. with subsequent precipitation of protein substances from the solution in the isoelectric point at a pH of 3.0 to 4.5.
Claim 5
Dependent Claim
190 words
The method of claim 1, wherein the hydrolysis of said first portion of said activated sludge is effected at a pH of 0.5 to 6.0 and a temperature of 50° to 80° C. the separated first precipitate is subjected to further hydrolysis at a pH of 0.01 to 0.5 and a temperature of 80° to 100° C., thus forming an additional solution or waterOsoluble proteins, carbohydates, mineral substances and vitamins and a second precipitate which is acid, separating said additional solution of water-soluble substances from said second precipitate washing said second precipitate with water returning the washing water to the first hydrolysis state, subjecting said second portion of said activated sludge to alkaline extraction at a pH of 9 to 13 and a temperature of 80° to 90° C. thus forming a further solution of soluble proteins and a third precipitate which is alkaline and which includes undissolved proteins and polysaccharides, precipitating the extracted protein substances from said further solution at the isoelectric point at a pH of 3.0 to 4.5, said separating the precipitated protein substances from the remaining solution which contains amino acids, vitamins, carbohydrates and mineral substances.
Claim 6
Dependent Claim
27 words
The method of claim 4, wherein said solutions containing water-soluble protein, carbohydrate, mineral substances and vitamins are used in a culture medium for the fermentation of microorganisms.
Claim 7
Dependent Claim
29 words
The method of claim 1 and wherein said first precipitate is washed with water to obtain an acidic wash water which is utilized for acidification of additional activated sludge.
Claim 8
Dependent Claim
31 words
The method of claim 1 and wherein said other precipitate which is alkaline is utilized for the neutralization of the acid hydrolysate obtained from said first portion of said activated sludge.
Claim 9
Dependent Claim
31 words
The method of claim 6 and wherein said other precipitate which is alkaline is utilized for the neutralization of the acid hydrolysate obtained from said first portion of said activated sludge.
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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |