| Patent Number |
Title Of Patent |
Date Issued |
| 7011757 |
Process for recycling mixed liquor with dual-use jet recirculation pumps to provide highly effic |
March 14, 2006 |
| A process that removes nitrogen by the MLE Process or nitrogen and phosphorus by the Bio-P Process from municipal or industrial wastewaters by combining at least one dual-use jet recirculation pump with jet manifolds disposed at the bottoms of deep tanks functioning as Reactors to wi |
| 5266200 |
Sequence continuous reaction in complete mix activated sludge systems |
November 30, 1993 |
| A complete mix activated sludge basin is operated as a Sequence Continuous Reactor by cyclically aerating the mixed liquor to form an aerobic cycle at selected high dissolved oxygen levels, during which nitrification takes place, and cyclically mixing the liquor without aerating to form |
| 5041217 |
Apparatus for maximizing biological use of entire volume of endless channel in an oxidation ditc |
August 20, 1991 |
| A process and any of several pump/circulators provide selective rapid mixing of influent wastewater with the mixed liquor in the channel of an oxidation ditch and thereby provide maximized use of the entire volume of the channel. The pump/circulator is disposed at the beginning of the |
| 4933087 |
Recovery of fats and proteins from food processing wastewaters with alginates |
June 12, 1990 |
| A process is disclosed for treating food wastewaters by acidifying to a low pH, adding an alginate, and, preferably, adding lime to a pH of at least 7.0, without adding iron or aluminum to assist in coagulation and flocculation of the wastewater. A floc is formed at acid pH in some w |
| 4917805 |
Cyclical complete mix activated sludge process |
April 17, 1990 |
| A nitrification-denitrification process is disclosed wherein a single flow-through and cyclically operated complete mix activated sludge basin, containing mixed liquor having a mean cell residence time of at least 15 days, is fed with wastewater and discharges treated wastewater to a |
| 4902302 |
Conservation of momentum in a barrier oxidation ditch |
February 20, 1990 |
| For use in an activated sludge process, dual-baffle aerators for both vertically mounted surface aerators and static mixer-aerators are disclosed. These devices substantially prevent back-mixing of freshly aerated liquor into aerator intakes and provide directional propulsion. By con |
| 4828577 |
Process for converting food sludges to biomass fuels |
May 9, 1989 |
| A process is described for treating a feed wastewater from a food preparation plant to recover substantially all of its fats and up to 50% of its proteins in a chemical float sludge which is selectively admixed with an absorptive bulking agent, such as sawdust, at a dry-basis weight |
| 4734197 |
Jet aerator header assemblies and methods for use thereof in total, partial, and non-barriered o |
March 29, 1988 |
| A jet aerator header assembly is provided for the deep oxygen contact duct of a partial, total, or non-barriered oxidation ditch having an endless channel. The header assembly may be vertically installed in the bottom of the contact duct or at an angle in the intake portion thereof as a |
| 4728517 |
Conversion of biological sludge and primary float sludge to animal protein supplement |
March 1, 1988 |
| A process is described for producing an animal feed, comparable to feathermeal in properties and appearance, from two waste products: float sludge and activated sludge. The process uses a bulking agent for extracting excess fat from the sludges, particularly the float sludge, while a |
| 4722785 |
Partial or non-barriered oxidation ditch having momentum conservation and increased oxygen trans |
February 2, 1988 |
| An improved barrier oxidation ditch is provided which has a channel portion for unaerated induced-flow and an inclined duct for aerated induced flow, whereby energy in the dammed-up momentum is more efficiently released. This induced-flow duct is inclided at 30.degree. to 60.degree. to t |
| 4643830 |
Process for operating a total barrier oxidation ditch |
February 17, 1987 |
| A process for operating a total barrier oxidation ditch to provide concentrated power input per unit volume of the downwardly pumped liquor-air mixture and high mixing turbulence at maximum contact depth and hydrostatic pressure. |
| 4585555 |
Barrier oxidation ditch having increased flow efficiency and oxygen transfer efficiency |
April 29, 1986 |
| An improved barrier oxidation ditch is provided which has an inclined duct for the induced flow, whereby energy in the dammed-up momentum is more efficiently released. This induced-flow duct is inclined at 30.degree. to 60.degree. to the horizontal, preferably 45.degree., and is disposed |
| 4548712 |
Conservation of momentum in a barrier oxidation ditch |
October 22, 1985 |
| A process is described for pumping and aerating the mixed liquor within the endless channel of an oxidation ditch by using a pump/aerator to form an aerobic zone which has a selectively located planar end, where an anoxic zone begins, and within which biological nitrification of NH.sub.3 |
| 4543185 |
Conservation of momentum in a barrier oxidation ditch |
September 24, 1985 |
| A dual baffle pump/aerator assembly comprising a concave intake baffle which is disposed upon the floor of an endless channel of an oxidation ditch to intercept the flow of mixed liquor within the channel. A horizontal barrier having aeration means associated therewith is disposed ab |
| 4537679 |
Conservation of momentum in a barrier oxidation ditch |
August 27, 1985 |
| A mixing-control apparatus for continuously moving mixed liquor having translational-flow momentum within an endless channel of a closed-circuit oxidation ditch, conserves at least of the portion of the momentum by enabling induced flow of the mixed liquor through adjustable openings in |
| 4532038 |
Flow control apparatus for aerobic sewage treatment |
July 30, 1985 |
| In aerobic wastewater treatment systems, such as sewage treatment, liquid in a channel spanned by a liquid-tight barrier is moved past the barrier by a liquid-gas contact pump, thus dissolving a gas in the liquid and creating a differential head that provides flow energy for moving the |
| 4521307 |
Conservation of momentum in a barrier oxidation ditch |
June 4, 1985 |
| A barriered pump/aerator, for continuously moving and aerating mixed liquor having translational-flow momentum within an endless channel of a barrier oxidation ditch, conserves at least a portion of the momentum by enabling induced flow of the mixed liquor past the barrier. In one embodi |
| 4512895 |
Pumpless clarifier apparatus and process for operation thereof in combination with a draft tube |
April 23, 1985 |
| An integral clarifier is provided that operates without a pump by deriving the clarifier feed stream and its accompanying pump head from the flow being pumped through the draft tube of a draft tube circulator/aerator assembly in a complete mix system or in a basin oxidation ditch. The |
| 4460471 |
Flow-control process for an oxidation ditch |
July 17, 1984 |
| This flow-control apparatus for an oxidation ditch comprises a barrier which divides a channel of an oxidation ditch into an intake channel and a discharge channel, at least one submerged turbine which pumps mixed liquor from the intake channel, and at least one discharge duct which conn |
| 4455232 |
Method and apparatus for induced-flow circulation and pressurized aeration in a barrier oxidatio |
June 19, 1984 |
| A barriered circulator/aerator in the endless channel of a barrier oxidation ditch provides a directly pumped flow of mixed liquor into a central liquor inlet zone and an energy-release induced flow of mixed liquor into a surrounding liquor inlet zone at the inlet of a deep oxygen co |
| 4443338 |
Conversion of plug flow and complete mix aeration basins to barrier oxidation ditches |
April 17, 1984 |
| Methods are provided for converting both plug flow and complete mix basins of the prior art into barrier oxidation ditches. Circulator/aerators are described that can be prefabricated and dropped onto the floor of an existing basin so that, in combination with at least one partition, if |
| 4394268 |
Conversion of plug flow and complete mix aeration basins to barrier oxidation ditches |
July 19, 1983 |
| Methods are provided for converting both plug flow and complete mix basins of the prior art into barrier oxidation ditches. Circulator/aerators are described that can be prefabricated and dropped onto the floor of an existing basin so that, in combination with at least one partition, if |
| 4278547 |
Conservation of momentum in a barrier oxidation ditch |
July 14, 1981 |
| Dual baffle aerators substantially prevent back-mixing of freshly aerated liquor into aerator intakes and provide directional propulsion. By connecting two or more such devices to form a barrier across the channel of an oxidation ditch, homogeneous aeration is provided to the mixed l |
| 4260486 |
Flow-control apparatus and process for an oxidation ditch |
April 7, 1981 |
| This flow-control apparatus for an oxidation ditch comprises a barrier which divides a channel of an oxidation ditch into an intake channel and a discharge channel, at least one submerged turbine which pumps mixed liquor from the intake channel, and at least one discharge duct which conn |
