US3658697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical coagulation of carbon treated waste water
Assignee: Westvaco Corp
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Filing: 1970-07-31
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Granted: 1972-04-25
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Expires: 1990-07-31
Abstract
Abstract A process for separating water from sewage includes the steps of subjecting raw sewage to a primary treatment for removing certain suspended solids and thereafter passing the effluent up through a column containing an activated carbon bed under anerobic biological conditions with sufficient velocity to expand the activated carbon bed. Subsequent to adsorbent contacting, effluent from the activated carbon column is then treated with a mixture of chemical flocculants to coagulate the suspended solids and bind the sulfides with a soluble salt to inhibit or prevent the escape of noxious hydrogen sulfide. Floc is allowed to form and is separated from the supernatant.
Inventors
- 👤 Charles H Huether
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:55
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; C02F3/2806; C02F1/00; C02F1/28; C02F1/283; C02F1/52; C02F1/5236
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
39 words
The process according to claim 1 wherein said effluent from said activated carbon bed is treated with said flocculating agent in a concentration of at least 75 p.p.m. of said soluble iron salt and 0.06 p.p.m. of polyelectrolyte flocculant.
Claim 2
Dependent Claim
12 words
The process according to claim 2 wherein said polyelectrolyte flocculant is anionic.
Claim 3
Dependent Claim
33 words
The process according to claim 1 wherein said effluent from said activated carbon bed is treated with said flocculating agent in a concentration of at least 100 ppm of said soluble iron salt.
Claim 4
Dependent Claim
133 words
A process for removing water from sewage comprising the steps of: a. removing readily settleable suspended solids from raw sewage; b. passing the effluent from which said readily settleable suspeNded solids have been removed up through at least one activated carbon bed under hydrogen sulfide generating anaerobic bacteriological conditions with sufficient velocity to cause said activated carbon bed to expand for adsorbing dissolved solids from said effluent while permitting the suspended solids which remained in said effluent to pass through said activated carbon bed; c. treating the effluent from said activated carbon bed with a sufficient quantity of a flocculating agent comprising a soluble iron salt to precipitate dissolved hydrogen sulfide and coagulate said precipitate and said suspended solids in a supernatant; and d. separating said precipitates and said floc from said supernatant.
Claim 5
Dependent Claim
34 words
The process according to claim 5 wherein said effluent from which readily settleable suspended solids have been removed is passed up through said carbon bed with a superficial velocity of at least 6 gpm/ft.2.
Claim 6
Dependent Claim
33 words
The process according to claim 5 wherein said effluent from said activated carbon bed is treated with said flocculating agent in a concentration of at least 100 ppm of said soluble iron salt.
Claim 7
Dependent Claim
43 words
The process according to claim 5 wherein said effluent from said activated carbon bed is treated with a flocculating agent having a concentration of at least 75 p.p.m. of said soluble iron salt and at least 0.06 p.p.m. of a polyelectrolyte flocculating agent.
Claim 8
Dependent Claim
13 words
The process according to claim 8 wherein said polyelectrolyte flocculating agent is anionic.
Claim 9
Dependent Claim
63 words
The process according to claim 5 wherein said step of treating said effluent from said activated carbon bed with a flocculating agent comprises the steps of: a. treating said effluent from said carbon bed with a water soluble iron salt to precipitate dissolved hydrogen sulfide; and b. treating said effluent from said carbon bed with either lime or slaked lime to produce flocculation.
Claim 10
Dependent Claim
26 words
The process according to claim 5 further comprising the step of adding an inorganic base to said flocculating agent to adjust the alkalinity for aiding flocculation.
Claim 11
Dependent Claim
30 words
The process according to claim 5 wherein said effluent from which readily settleable suspended solids have been removed is passed through a plurality of activated carbon beds connected in series.
Claim 12
Dependent Claim
15 words
The process according to claim 12 wherein said activated carbon beds contain granular activated carbon.
Claim 13
Dependent Claim
15 words
The process according to claim 5 wherein said activated carbon bed contains granular activated carbon.
Claim 14
Dependent Claim
141 words
A process for removing water from sewage comprising the steps of: a. removing readily settleable suspended solids from raw sewage; b. passing the effluent from which readily settleable suspended solids have been removed up through at least one activated carbon column at a superficial velocity of at least 6 gallons per minute per square foot, under hydrogen sulfide generating, anaerobic biological reaction conditions, for adsorbing dissolved solids from said effluent while permitting the suspended solids remaining in said effluent to pass through said activated carbon bed; c. treating said effluent from said activated carbon bed with at least 75 p.p.m. of a water soluble iron salt to precipitate dissolved hydrogen sulfide and at least 0.06 p.p.m. of an anionic polyelectrolyte flocculant to coagulate said precipitate and said suspended solids in a supernatant; and d. separating said coagulated matter from said supernatant.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |