US3755156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for biochemical treatment of industrial waste water
Assignee: Individual
•
Filing: 1971-05-04
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Granted: 1973-08-28
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Expires: 1991-05-04
Abstract
Abstract A method for biochemical treatment of industrial waste water containing combined oxygen in the form of inorganic compounds of hexavalent chromium, chlorine or mixtures of said compounds, in which said industrial waste water is mixed with municipal sewage containing organic matter and in which said municipal sewage is subject to mechanical purification from contaminants present therein. The mixed water is thereafter fed to an unaerated tank, wherein biochemical reduction of said inorganic oxygen-containing compounds through the use of activated sludge as well as biochemical oxidation of organic matter are effected simultaneously. Biochemical reduction of inorganic oxygencontaining compounds having been effected, the mixed water together with the activated sludge is delivered from the unaerated tank to a settler and the precipitated sludge adapted to said inorganic oxygen-containing compounds is returned to said unaerated tank. The herein-disclosed method provides for treatment of industrial waste water featuring higher concentration of inorganic oxygen-containing compounds of chromium and chlorine as well as for a more intensified process of reduction of said compounds.
Inventors
- 👤 S Yakovlev
- 👤 J Voronov
- 👤 V Korenkov
- 👤 T Karjukhina
- 👤 I Churbanova
- 👤 A Nevsky
- 👤 V Dobrikova
- 👤 J Laskov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:24
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/025; C02F2101/00; C02F2101/10; C02F2101/20; C02F2101/22; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912; Y10S210/913
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
25 words
A method as claimed in claim 1, wherein said industrial waste water and municipal sewage are mixed followed by mechanical purification of the mixed water.
Claim 2
Dependent Claim
24 words
A method as claimed in claim 1, wherein the municipal sewage is subjected to mechanical purification followed by mixing with said industrial waste water.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1, wherein the mixture of the industrial waste water and the municipal sewage is delivered from the settler to be disinfected.
Claim 4
Dependent Claim
56 words
A method as claimed in claim 1, wherein the mixture of tHe industrial waste water and the municipal sewage is delivered from the settler to the aerobic biochemical oxidation of the residual organic matter and microflora is precipitated and removed from the mixed water, the activated sludge being returned to the stage of aerobic biochemical oxidation.
Claim 5
Dependent Claim
26 words
A method as claimed in claim 5, wherein the mixture of the industrial waste water and the municipal sewage after removing from the microflora is disinfected.
Claim 6
Dependent Claim
35 words
A method as claimed in claim 1, wherein when said inorganic compounds are chlorates, perchlorates, or mixtures thereof the excess activated sludge from the settler arranged beyond the unaerated tank, is fed to said tank.
Claim 7
Independent Claim
248 words
A method for biochemical treatment of industrial waste water containing inorganic compounds selected from the group consisting of chlorates, perchlorates, and mixtures thereof, which comprises mixing said industrial waste water with municipal sewage containing organic matter, purifying by mechanical means said municipal sewage from contaminants present therein, feeding the mixed water to an unaerated tank, the mixing of the industrial waste water and the municipal sewage being effected so that biological oxygen demand of the mixed water being fed to said unaerated tank exceeds the amount of oxygen in said inorganic compounds by not less than 20 mg/l in said unaerated tank into which the mixed water is fed, reducing biochemically said inorganic compounds by means of activated sludge recycled from a settler and oxidizing biochemically the organic matter, delivering the mixture of said industrial and municipal sewage with the activated sludge from the unaerated tank to a settler and returning the activated sludge adapted to said inorganic oxygen-containing compounds to said unaerated tank, delivering the mixture of the industrial waste water and the municipal sewage from the settler to a stage for the aerobic biochemical oxidation of residual organic matter to precipitate and remove microflora from the mixed water, the activated sludge being returned to the stage of the aerobic biochemical oxidation, and delivering the excess activated sludge available from the settler arranged beyond said unaerated tank and the excess microflora from the settler arranged beyond the stage of the aerobic biochemical oxidation to said unaerated tank.
Claim 8
Independent Claim
234 words
A method for biochemical treatment of industrial waste water containing chromates, which comprises mixing said industrial waste water with municipal sewage containing organic matter, purifying by mechanical means said municipal sewage from contaminants present therein, feeding the mixed water to an unaerated tank, the mixing of the industrial waste water and the municipal sewage being effected so that biological oxygen demand of the mixed water being fed to said unaerated tank exceeds the amount of oxygen in said chromates by not less than 20 mg/l in said unaerated tank into which the mixed water is fed, reducing biochemically said chromates by means of activated sludge recycled from a settler and oxidizing biochemically the organic matter, delivering the mixture of said industrial and municipal sewage with the activated sludge from the unaerated tank to a settler and returning the activated sludge adapted to said inorganic oxygen-containing compounds to said unaerated tank, delivering the mixture of the industrial waste water and the municipal sewage from the settler to a stage for the aerobic biochemical oxidation of the residual organic matter to precipitate and remove microflora from the mixed water, the activated sludge being returned to the stage of the aerobic biochemical oxidation, and delivering excess activated sludge available from the settler arranged beyond said unaerated tank and the excess microflora from the settler arranged beyond the stage of the aerobic biochemical oxidation to said unaerated tank.
Claim 9
Dependent Claim
34 words
A method as claimed in claim 1, wherein when said inorganic compounds are chromates, the value of pH of the mixed water iN the settler after passing the unaerated tank is maintained at 9.5-10.
Claim 10
Dependent Claim
25 words
A method as claimed in claim 9, wherein the value of pH of the mixed water after passing the unaerated tank is maintained at 9.5-10.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |