Patent US3854875A successfully refreshed from Google Patents.
US3854875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plant for treating water, in particular sewage or sludge
Assignee: Sulzer AG
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Filing: 1971-10-07
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Granted: 1974-12-17
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Expires: 1991-10-07
Abstract
Abstract The water treatment plant is operated on a batch basis with sludge being repeatedly circulated past a source of gamma radiation in order to destroy harmful germs in the sludge batch. After a number of circulations, the batch of sludge is flushed into a collecting vessel for subsequent removal. The sludge batch is passed by the radiation source through a large flow crosssection and at a high flow velocity. The plant achieves a uniform radiation of each batch.
Inventors
- 👤 E Bosshardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:34
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/30; C02F1/307; C02F2303/00; C02F2303/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A sewage sludge treatment plant comprising a source of gamma radiation; duct means disposed about said source of gamma radiation to provide a closed loop for the sludge, said duct means having at least two sections exposed to different sides of said source and defining an unencumbered flow path for the sludge; means for forming a batch of sludge from a supply of sludge to be irradiated, said means being connected to said duct means to deliver said batch of sludge to said duct means; and a pump connected within and to said duct means for repeatedly circulating a delivered batch of sludge through said closed loop of said duct means from a delivery side of said pump through said unencumbered path in said sections of said duct means to an input side of said pump.
Claim 2
Dependent Claim
136 words
A sewage sludge treatment plant comprising a source of gamma radiation; duct means disposed about said source of gamma radiation to provide a closed loop for the sludge, said duct means having at least two sections exposed to different sides of said source and defining an unencumbered flow path for the sludge; means for forming a batch of sludge from a supply of sludge to be irradiated, said means being connected to said duct means to deliver said batch of sludge to said duct means; and a pump connected within and to said duct means for repeatedly circulating a delivered batch of sludge through said closed loop of said duct means from a delivery side of said pump through said unencumbered path in said sections of said duct means to an input side of said pump.
Claim 3
Dependent Claim
65 words
A water treatment plant as set forth in claim 1 wherein said means for forming a batch of sludge includes a collecting vessel for containing the supply of sludge to be irradiated, a first duct connecting said collecting vessel to said duct means to deliver sludge to said duct means and a second duct to return sludge from said duct means to said collecting vessel.
Claim 4
Dependent Claim
29 words
A water treatment plant as set forth in claim 1 further comprising a water supply means selectively connected to said duct means for flushing water through said duct means.
Claim 5
Dependent Claim
29 words
A water treatment plant as set forth in claim 1 further comprising a collecting vessel selectively connected to said duct means to receive an irradiated batch of sludge therefrom.
Claim 6
Dependent Claim
39 words
A water treatment plant as set forth in claim 4 further comprising valve means between said duct means and said collecting vessel for controlling passage of an irradiated batch of sludge from said duct means to said collecting vessel.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |