US4802994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biocide treatment to control sulfate-reducing bacteria in industrial process waste waters
Assignee: ChampionX LLC
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Filing: 1987-08-18
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Granted: 1989-02-07
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Expires: 2007-08-18
Abstract
Abstract Sulfate-reducing bacteria present in industrial waste waters can be controlled by using hydrogen peroxide in combination with non-oxidizing organic biocides known to be effective against sulfate-reducing bacteria.
Inventors
- 👤 Richard J. Mouche
- 👤 Mei-Jan L. Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:07
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/50; C02F1/72; C02F1/722
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
A method of controlling sulfate-reducing bacteria in flue gas scrubber sludges or slurries produced from scrubbing gases in utilities, said sludges or slurries having a sulfate-reducing bacteria population greater than 10 colonies per ml which comprises treating said sludges or slurries with a biocidal composition comprising: A. Hydrogen peroxide, and B. A non-oxidizing organic biocide effective against sulfate-reducing bacteria selected from the group consisting of sodium dimethyldithiocarbamate/disodium ethylene bisdithiocarbamate in a 1:1 weight ratio, metronidazole and gluteraldehyde with the dosage of A being at least 1,000 ppm by weight of the sludges or slurries and the dosage of B being within the range of between about 5-500 ppm by weight of the sludges or slurries.
Claim 2
Independent Claim
115 words
A method of controlling sulfate-reducing bacteria in flue gas scrubber sludges or slurries produced from scrubbing gases in utilities, said sludges or slurries having a sulfate-reducing bacteria population greater than 10 colonies per ml which comprises treating said sludges or slurries with a biocidal composition comprising: A. Hydrogen peroxide, and B. A non-oxidizing organic biocide effective against sulfate-reducing bacteria selected from the group consisting of sodium dimethyldithiocarbamate/disodium ethylene bisdithiocarbamate in a 1:1 weight ratio, metronidazole and gluteraldehyde with the dosage of A being at least 1,000 ppm by weight of the sludges or slurries and the dosage of B being within the range of between about 5-500 ppm by weight of the sludges or slurries.
Claim 3
Dependent Claim
23 words
The method of claim 1 where the non-oxidizing organic biocide is a biocidally active sodium dimethyldithiocarbamate/disodium ethylene bisdithiocarbamate in a 1:1 weight ratio.
Claim 4
Dependent Claim
12 words
The method of claim 1 where the non-oxidizing organic biocide is glutaraldehyde.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein the dosage of "A" is within the range of 1500-3000 ppm.
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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |