Patent US3677409A successfully refreshed from Google Patents.
US3677409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment system
Assignee: Individual
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Filing: 1970-10-15
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Granted: 1972-07-18
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Expires: 1990-10-15
Abstract
Abstract A sewage treatment system in which a bulbous shaped fiberglass tank is provided with an inlet and an outlet with an internal divider plate separating the tank into an aeration compartment and a settling compartment and a continuously activated airnozzle sludge removing conduit for removing sludge from the bottom of the settling compartment and filtering means upstream of the outlet for preventing the discharge of solid particles with a back-wash liquid air nozzle beneath the liquid surface for continuously back-washing the filter means and for creating surface turbulence in the settling compartment for enhancing the operation of an air-nozzle operated skimmer means mounted adjacent the surface of liquid in the settling compartment.
Inventors
- 👤 Carl W Ferm
- 👤 Fred R Sechler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:36
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1236; C02F3/1242; B; B01; B01D; B01D21/00; B01D21/0006; B01D21/0012; B01D21/10; B01D21/24; B01D21/2433; B01D21/245; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
234 words
A sewage treatment system comprising tank means of circular configuration as viewed from above, inlet means in said tank means for introducing sewage to be treated into said tank means, outlet means connected to said tank means for discharging treated material, a tank divider having an upper edge extending across the width of said tank between said inlet means and said outlet means below the height of said inlet means to define an aeration compartment on the side of said tank divider toward said inlet means and a settling compartment on the side of said tank divider towards said outlet means whereby material passes from said aeration compartment over said upper edge of said tank divider and cascades into said settling compartment, aeration means for introducing air into said aertation compartment adjacent the bottom of said aeration compartment, sludge return means for returning sludge from adjacent the bottom of said settling compartment to said aeration compartment, removable filter screen means in said settling compartment positioned upstream of said outlet means and through which all effluent must pass for preventing discharge of solid materials by said outlet means and skimmer means for simultaneously removing solid materials floating on the surface of liquid in said settling compartment and foam-like scum from above the surface of said liquid in said settling compartment and for returning said removed solid materials and said foam-like scum to said aeration compartment.
Claim 2
Dependent Claim
234 words
A sewage treatment system comprising tank means of circular configuration as viewed from above, inlet means in said tank means for introducing sewage to be treated into said tank means, outlet means connected to said tank means for discharging treated material, a tank divider having an upper edge extending across the width of said tank between said inlet means and said outlet means below the height of said inlet means to define an aeration compartment on the side of said tank divider toward said inlet means and a settling compartment on the side of said tank divider towards said outlet means whereby material passes from said aeration compartment over said upper edge of said tank divider and cascades into said settling compartment, aeration means for introducing air into said aertation compartment adjacent the bottom of said aeration compartment, sludge return means for returning sludge from adjacent the bottom of said settling compartment to said aeration compartment, removable filter screen means in said settling compartment positioned upstream of said outlet means and through which all effluent must pass for preventing discharge of solid materials by said outlet means and skimmer means for simultaneously removing solid materials floating on the surface of liquid in said settling compartment and foam-like scum from above the surface of said liquid in said settling compartment and for returning said removed solid materials and said foam-like scum to said aeration compartment.
Claim 3
Dependent Claim
50 words
The invention of claim 1 additionally including back-wash liquid jet creating means beneath the surface of liquid in said settling compartment for creating and directing a liquid jet against the downstream side of said filter screen for backwashing said screen to remove particles from the upstream side of said screen.
Claim 4
Dependent Claim
97 words
The invention of claim 2 wherein said back-wash jet creating means includes a tubular nozzle pipe having an open lower end and an open upper discharge end and an intermediate interior air nozzle directing an air blast in a direction toward said upper discharge end whereby liquid surrounding said lower inlet end is drawn into said nozzle pipe and discharged upwardly against said filter screen to pass through said filter screen and create turbulence on the upper surface of the liquid on the upstream side of said filter screen to enhance the operation of said skimmer means.
Claim 5
Dependent Claim
106 words
The invention of claim 3 wherein said skimmer means comprises a shallow open-topped container having its upper surface adjacent the fluid level in said settling compartment and skimmer conduit means open on one end to communicate with the bottom of said open-topped container and having an opposite open discharge end over said aeration chamber and nozzle means in said skimmer conduit means with said air nozzle means being connected to a source of air pressure and being mounted within said skimmer conduit for creating flow from said open-topped container through said skimmer conduit to discharge from the end of said skimmer conduit in said aeration chamber.
Claim 6
Dependent Claim
82 words
The invention of claim 4 wherein said sludge return means comprises a conduit having an open end adjacent the bottom of said settling compartment and a discharge end above the liquid level in said aeration chamber, air nozzle means connected to a source of pressurized air and mounted on the interior of said sludge removing conduit adjacent the lower end thereof for creating flow in said sludge removing conduit from the lower end to the discharge end of said sludge removing conduit.
Claim 7
Dependent Claim
17 words
The invention of claim 5 wherein said tank means and said tank divider is formed of fiberglass.
Claim 8
Dependent Claim
26 words
The invention of claim 6 additionally including a removable cover attached to the top of said tank for permitting access to the interior of said tank.
Claim 9
Dependent Claim
34 words
The invention of claim 6 additionally including vertically adjustable dam means mounted adjacent the upper edge of said tank divider for adjusting the flow of material from said aeration compartment to said settling compartment.
Claim 10
Dependent Claim
12 words
The invention of claim 8 wherein said tank is of bulbous shape.
Claim 11
Dependent Claim
87 words
The invention of claim 8 wherein said vertically adjustable dam means comprises at least one vertically adjustable plate mounted adjacent a downwardly extending rectangular slot extending downwardly from the top edge of said tank divider and additionally including a curved baffle plate attached to said divider adjacent said downwardly extending slot on the aeration chamber side of said divider whereby surface flow from said aeration compartment into said settling compartment is prevented to keep floating material in said aeration compartment from being discharged into said settling compartment.
Claim 12
Dependent Claim
82 words
The invention of claim 10 wherein said sludge return means comprises a conduit having an open end adjacent the bottom of said settling compartment and a discharge end above the liquid level in said aeration chamber, air nozzle means connected to a source of pressurized air and mounted on the interior of said sludge removing conduit adjacent the lower end thereof for creating flow in said sludge removing conduit from the lower end to the discharge end of said sludge removing conduit.
Claim 13
Dependent Claim
83 words
The invention of claim 10 wherein there are two adjustable dam means mounted adjacent downwardly extending rectangular slots positioned adjacent each side of said tank divider and a curved baffle plate is associated with each of said slots with the lower ends of said curved baffle plate being positioned adjacent the tank wall out of alignment with the aeration means so that the lower ends of said baffle members are in a portion of the tank having liquid flow in a downward direction.
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |