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US3764525A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for removing suspended solids from liquids

Assignee: Smith and Loveless Inc
•
Filing: 1970-01-30
•
Granted: 1973-10-09
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Expires: 1990-01-30
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Abstract

Abstract The invention provides a method and apparatus for removing suspended solids from liquids. In carrying out the method, a liquid containing suspended solids is delivered to a screen with a directional component across the screen surface and a directional component through the screen. The screen has openings that are large enough to pass a majority of the suspended solids, and the screen has the ability to hold a layer of the solids on the upstream side thereof. The flow of the liquid is controlled so that the coating is formed and maintained on the screen, and serves as a filtration medium. The invention also provides improved apparatus which comprises means defining a liquid filtration zone having a screen separating it into influent and effluent zones. The screen has openings large enough to pass the majority of suspended solids and has the ability to hold a layer of the solids on the upstream side. Means are provided for delivering liquids and suspended solids to the screen with a directional component parallel to the face of the screen and a directional component through the screen.

Inventors

  • 👤 B Goodman
  • 👤 Kibben J Mc

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 20:19
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1236; C02F3/1242; B; B01; B01D; B01D29/00; B01D29/01; B01D29/11; B01D29/114; B01D29/115; B01D29/117; B01D29/118; B01D29/50; B01D29/52; B01D29/54; B01D29/60; B01D29/605; B01D29/88; B01D29/885; B01D35/00; B01D35/28; B01D37/00; B01D37/04; C02F3/06; B01D2201/00; B01D2201/04; B01D2201/043; Y; Y02; Y02W; Y02W10/00; Y02W10/10

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 14 words
The method as defined in claim 1 wherein said suspended solids comprise activated sludge.
Claim 2
Dependent Claim 25 words
The method as defined in claim 2 further including the step of aerating said liquid and said suspended solids prior to delivery to said filter.
Claim 3
Dependent Claim 27 words
The method as defined in claim 2 wherein said screen is constructed of Dacron and said openings are in the range of about 10 to 100 microns.
Claim 4
Dependent Claim 20 words
The method as defined in claim 4 wherein said openings are in the range of about 50 to 90 microns.
Claim 5
Dependent Claim 27 words
The method as defined in claim 2 wherein said screen is constructed of nylon and said openings are in the range of about 10 to 100 microns.
Claim 6
Dependent Claim 23 words
The method as defined in claim 2 wherein said directional component across said screen is no greater than about 5 feet per second.
Claim 7
Dependent Claim 22 words
The method as defined in claim 2 wherein said directional component across said screen is about 1 - 3 feet per second.
Claim 8
Dependent Claim 23 words
The method as defined in claim 2 wherein said directional component across said screen is no greater than about 10 feet per second.
Claim 9
Dependent Claim 25 words
The method as defined in claim 9 wherein the directional component through said screen is about 4 to 300 gallons per square foot per day.
Claim 10
Dependent Claim 25 words
The method as defined in claim 9 wherein the directional component through said screen is about 5 to 50 gallons per square foot per day.
Claim 11
Dependent Claim 22 words
The method as defined in claim 11 wherein said directional component across said screen is about 1 - 3 feet per second.
Claim 12
Independent Claim 159 words
A method for removing suspended solids from liquids, said suspended solids comprising activated sludge, said method comprising: delivering liquid containing said suspended solids to a Dacron screen having openings large enough to pass the majority of said suspended solids, said openings being in the range of about 10 to 100 microns, with a directional component across said screen and a directional component through said screen, said directional component across said screen being no greater than about 10 feet per second, and said directional component through said screen being about 4 to 300 gallons / square foot / day, whereby to form a coating of said solids on said screen surface; continuing the delivery of liquid containing said suspended solids to said screen with said directional components across and through said screen, whereby to filter solids from said liquid passing through said coating and screen; and controlling the relationships between said directional components to maintain said coating on said screen.
Claim 13
Dependent Claim 25 words
The method as definEd in claim 13 wherein said directional component through said screen is about 5 to 50 gallons / square foot / day.
Claim 14
Dependent Claim 22 words
The method as defined in claim 14 wherein said directional component across said screen is about 1 to 3 feet per second.

References Cited (Backward Citations)

US2407303A Cited
US2830947A Cited
US3051315A Cited
US3398088A Cited
US3440669A Cited
US3543294A Cited
US3530990A Cited
US3575850A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-10-08 1977-04-09 1977-10-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-10-08 1981-04-09 1981-10-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-10-08 1985-04-09 1985-10-09 $7700.00 Window Closed / Lapsed

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