Patent US3897110A successfully refreshed from Google Patents.
Patent US4956093A successfully refreshed from Google Patents.
US4956093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wastewater treatment process
Assignee: Individual
•
Filing: 1988-04-06
•
Granted: 1990-09-11
•
Expires: 2008-04-06
Abstract
Abstract A wastewater treatment system in which biologically active particulate material mixed with wastewater is recirculated under turbulent conditions. The biomass is maintained at high concentration, and recirculation of the particles maintains the biological layer on the particles at a more active and efficient state would be the case without such recirculation. The system is particularly efficient, especially when the organic waste materials are slowly or relatively non-biodegradable, when the particulate material is adsorbtive (as, for example are particles of activated carbon) and the recirculation system includes an ultrafilter. When combined with a pretreatment of either alum or ferric chloride with lime, the system is particularly suited for efficient and effective treatment of dairy wastes.
Inventors
- 👤 Massoud Pirbazari
- 👤 Jacob Shorr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:10
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/08; C02F3/085; B; B01; B01D; B01D61/00; B01D61/14; B01D61/145; B01D61/16; C02F1/00; C02F1/44; C02F1/444; C02F3/10; B01D2311/00; B01D2311/04; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
164 words
A process for treating wastewater including waste organic materials, said process comprising the steps of: providing biologically active powdered activated carbon particles carrying on the outer surfaces thereof an active biological layer including bacteria that is biologically reactive with and biodegrades at least some of said organic compounds; mixing said biologically active activated carbon with said wastewater in a tank having an outlet and a recirculation loop having an isotropic membrane filter arranged to retain said particulate material in the portion of said wastewater recirculated and turned to said tank, and to pass a filtered parmeate, said loop connected to said outlet and arranged to withdraw liquid from said tank, pass said liquid through said loop, and introduce at least a fraction of said withdrawn liquid back into said tank; and, circulating said wastewater and said biologically active activated carbon through said loop under turbulent flow conditions thereby to maintain said biological layers on said particles at mean thicknesses less than about 20 microns.
Claim 2
Dependent Claim
164 words
A process for treating wastewater including waste organic materials, said process comprising the steps of: providing biologically active powdered activated carbon particles carrying on the outer surfaces thereof an active biological layer including bacteria that is biologically reactive with and biodegrades at least some of said organic compounds; mixing said biologically active activated carbon with said wastewater in a tank having an outlet and a recirculation loop having an isotropic membrane filter arranged to retain said particulate material in the portion of said wastewater recirculated and turned to said tank, and to pass a filtered parmeate, said loop connected to said outlet and arranged to withdraw liquid from said tank, pass said liquid through said loop, and introduce at least a fraction of said withdrawn liquid back into said tank; and, circulating said wastewater and said biologically active activated carbon through said loop under turbulent flow conditions thereby to maintain said biological layers on said particles at mean thicknesses less than about 20 microns.
Claim 3
Dependent Claim
246 words
A process for treating wastewater including waste organic compounds, said process comprising the steps of: providing biologically active absorbtive powdered activated carbon particles in a concentration in said recirculating wastewater of at least 10,000 ppm, carrying on the outer surfaces thereof an active biological layer of a mean thickness on said carbon particles maintained at less than 20 microns, said layer including bacteria that is biologically reactive with and biodegrades at least some of said organic compounds, said bacteria in a concentration in said recirculating wastewater of at least 10,000 ppm; mixing said biologically active absorbtive powdered activated carbon with said wastewater whereby said powdered activated carbon absorbs organic compounds in said wastewater; circulating said wastewater with said biologically active absorbtive powdered activated carbon mixed therein from a tank through a recirculation loop arranged to withdraw liquid from said tank, pass said liquid through said loop and reintroduce at least a fraction of said withdrawn liquid back into said tank; providing in said recirculation loop an isotropic membrane filter arranged to retain said particulate absorbtive material in the portion of said wastewater recirculated and returned to said tank and to pass a filtered permeate; and controlling said circulating of said wastewater and said biologically active powdered activated carbon to provide turbulent flow conditions in said loop thereby to maintain the biological layer on said carbon particles at a thickness such that said layer is biologically active and reacts with organic materials absorbed by said carbon particles.
Claim 4
Dependent Claim
246 words
A process for treating wastewater including waste organic compounds, said process comprising the steps of: providing biologically active absorbtive powdered activated carbon particles in a concentration in said recirculating wastewater of at least 10,000 ppm, carrying on the outer surfaces thereof an active biological layer of a mean thickness on said carbon particles maintained at less than 20 microns, said layer including bacteria that is biologically reactive with and biodegrades at least some of said organic compounds, said bacteria in a concentration in said recirculating wastewater of at least 10,000 ppm; mixing said biologically active absorbtive powdered activated carbon with said wastewater whereby said powdered activated carbon absorbs organic compounds in said wastewater; circulating said wastewater with said biologically active absorbtive powdered activated carbon mixed therein from a tank through a recirculation loop arranged to withdraw liquid from said tank, pass said liquid through said loop and reintroduce at least a fraction of said withdrawn liquid back into said tank; providing in said recirculation loop an isotropic membrane filter arranged to retain said particulate absorbtive material in the portion of said wastewater recirculated and returned to said tank and to pass a filtered permeate; and controlling said circulating of said wastewater and said biologically active powdered activated carbon to provide turbulent flow conditions in said loop thereby to maintain the biological layer on said carbon particles at a thickness such that said layer is biologically active and reacts with organic materials absorbed by said carbon particles.
References Cited (Backward Citations)
US3490590A
Cited
US3904518A
Cited
US4173532A
Cited
US4200524A
Cited
US4566971A
Cited
US4582607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |