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| Number | Title | Issue Date |
| 7767089 | Membrane supported biofilm process for autotropic reduction A hollow gas transfer fiber is arranged in tows and potted into a module. The module may be used to treat wastewater by supplying hydrogen containing gas via the interior of the fibers to a biofilm present on an exterior surface of the fibers. ... | 08/03/2010 |
| RE39294 | Vertical skein of hollow fiber membranes and method of maintaining clean fiber surfaces while filtering a substrate to withdraw a permeate A vertical skein of “fibers”, opposed terminal portions of which are held in headers unconfined in a modular shell, is aerated with a gas-distribution means which produces a mass of bubbles serving the function of a scrub-brash for the outer surfaces of the fibe... | 09/19/2006 |
| 7070695 | Ultrafiltration and microfiltration module and system A method and apparatus of purifying feedwater to remove impurities including suspended solids therefrom, the method suitable for using in-line water pressure to permeate water through hollow fiber membranes and to backflush the membranes to remove solids collected o... | 07/04/2006 |
| 6908547 | Membrane module for gas transfer and membrane supported biofilm process An apparatus to transfer gas to or from a liquid has a flexible and oxygen permeable but liquid water impermeable membrane, a flexible and gas permeable spacer, an inlet conduit, an outlet conduit and a non-rigid restrain system. When used for treating wastewater, a... | 06/21/2005 |
| 6899812 | Water filtration using immersed membranes A process for operating filtering membranes submerged in a tank involves, in one aspect, periodically deconcentrating the tank by at least partially emptying and refilling the tank with fresh water while permeation continues. In another aspect, long trains of membra... | 05/31/2005 |
| 6899811 | Immersed membrane apparatus An apparatus for filtering a liquid in a tank has a plurality of elements and a frame for holding the elements while they are immersed in the liquid. The elements have a plurality of hollow fibre membranes attached to and suspended between an upper header and a lowe... | 05/31/2005 |
| 6814861 | Ultrafiltration and microfiltration module and system A method and apparatus of purifying feedwater to remove impurities including suspended solids therefrom, the method suitable for using in-line water pressure to permeate water through hollow fiber membranes and to backflush the membranes to remove solids collected o... | 11/09/2004 |
| 6814868 | Process for reducing concentrations of hair, trash, or fibrous materials, in a waste water treatment system A process for reducing hair, trash or fibrous materials concentration in a waste water treatment system having a membrane filter in conjunction with a bioreactor comprises flowing a portion of mixed liquor through a screen in a side stream. The flow rate of the mixe... | 11/09/2004 |
| 6790360 | Immersed membrane element and module A filtering element has ultrafiltration or microfiltration hollow fiber membranes extending horizontally between a pair of opposed horizontally spaced, vertically extending headers. Side plates extending between the pair of vertically extending headers define a vert... | 09/14/2004 |
| 6708957 | Moving aerator for immersed membranes One or more aerators move below an area of an assembly of immersed filtering membranes to be aerated. The movement can take various forms including the sweep of a pendulum. Positions in the assembly of membranes may be alternately aerated for a period of time and th... | 03/23/2004 |
| 6706189 | Cyclic aeration system for submerged membrane modules An aeration system for a submerged membrane module has a set of aerators connected to an air blower, valves and a controller adapted to alternately provide a higher rate or air flow and a lower rate of air flow in repeated cycles. In an embodiment, the air blower, v... | 03/16/2004 |
| 6702944 | Multi-stage filtration and softening module and reduced scaling operation A filtration module has at least one nanofiltration or reverse osmosis membrane. The module is used to filter water and, when optionally fitted with at least one membrane adapted to selectively reject hardness causing salts, is used to remove hardness. Me... | 03/09/2004 |
| 6685832 | Method of potting hollow fiber membranes A method of potting a plurality of hollow fiber membranes into a mass of solidified potting liquid is described. Open ends of a plurality of hollow fiber membranes are enclosed in a first material held in a container which may be a part of a permeate coll... | 02/03/2004 |
| 6682652 | Apparatus for withdrawing permeate using an immersed vertical skein of hollow fiber membranes An apparatus is described for withdrawing filtered permeate from a substrate contained in a reservoir at ambient pressure. The apparatus includes a plurality of membrane assemblies. Each assembly has a plurality of hollow fiber filtering membranes, immers... | 01/27/2004 |
| 6656356 | Aerated immersed membrane system An element of immersed, suction driven, filtering membranes has a plurality of hollow fiber membranes suspended between upper and lower headers. The lower header is movable between a first position in which the fibers are substantially elongated and secon... | 12/02/2003 |
| 6645374 | Membrane module for gas transfer and membrane supported biofilm process An apparatus to transfer gas to or from a liquid has a flexible and oxygen permeable but liquid water impermeable membrane, a flexible and gas permeable spacer, an inlet conduit, an outlet conduit and a non-rigid restraint system. When used for treating w... | 11/11/2003 |
| 6620319 | Apparatus for withdrawing permeate using an immersed vertical skein of hollow fibre membranes An apparatus for treating a multi component liquid substrate while leaving particulate matter therein as a skein of hollow fiber filtering membranes immersed in the substrate which is contained in a non-pressurized reservoir. A pumping fluid communication... | 09/16/2003 |
| 6592759 | Gel potting method and method to reduce twinning for filtering hollow fiber membranes To pot membranes in a header, a dense, viscous liquid, suspension or, preferably, a thixotropic, water soluble gel, is placed in a header pan in space reserved for a permeate channel. A plurality of hollow fiber membranes are collected together and their ... | 07/15/2003 |
| 6589426 | Ultrafiltration and microfiltration module and system A method and apparatus of purifying feedwater to remove impurities including suspended solids therefrom, the method suitable for using in-line water pressure to permeate water through hollow fiber membranes and to backflush the membranes to remove solids ... | 07/08/2003 |
| 6558549 | Membrane module for gas transfer and membrane supported biofilm process An apparatus to transfer gas to or from a liquid has a flexible and oxygen permeable but liquid water impermeable membrane, a flexible and gas permeable spacer, an inlet conduit, an outlet conduit and a non-rigid restraint system. When used for treating w... | 05/06/2003 |
| 6550747 | Cyclic aeration system for submerged membrane modules An aeration system for a submerged membrane module has a set of aerators connected to an air blower, valves and a controller adapted to alternately provide a higher rate of air flow and a lower rate of air flow in repeated cycles. In an embodiment, the ai... | 04/22/2003 |
| 6547968 | Pulsed backwash for immersed membranes A method and apparatus for chemical cleaning microfiltration and ultrafiltration membranes immersed in a tank involves backwashing a chemical cleaner through the membranes while the tank is empty of tank water. A backwash pump which drives the chemical cl... | 04/15/2003 |
| 6485645 | Biological process for removing phosphorus involving a membrane filter A waste water treatment process for biologically removing phosphates incorporates a membrane filter. The process includes three zones, an anaerobic zone, an anoxic zone and an aerobic zone containing an anaerobic, anoxic and aerobic mixed liquor. Water to... | 11/26/2002 |
| 6451201 | Distributed on-line integrity testing for immersed membranes In an apparatus for providing a continuous integrity test for suction driven filtering membrane assemblies 10, a monitoring line 32 diverts a portion of permeate to a monitoring device 30 (e.g. a turbidimeter). Both ends 34, 36 of the monitoring line are ... | 09/17/2002 |
| 6406629 | Biological process for removing phosphorous involving a membrane filter A waste water treatment process for biologically removing phosphates incorporates a membrane filter. The process includes three zones, an anaerobic zone, an anoxic zone and an aerobic zone containing an anaerobic, anoxic and aerobic mixed liquor. Water to... | 06/18/2002 |
| 6375848 | Water filtration using immersed membranes A process for operating filtering membranes submerged in a tank involves, in one aspect, periodically deconcentrating the tank by at least partially emptying and refilling the tank with fresh water while permeation continues. In another aspect, long train... | 04/23/2002 |
| 6361695 | Shipboard wastewater treatment system A method and system for treating wastewater in an onboard ship sewage treatment system having controlled suspended solids, the method comprising the steps of collecting wastewater in a collection tank and transferring the wastewater to a bioreactor to oxi... | 03/26/2002 |
| 6354444 | Hollow fiber membrane and braided tubular support therefor An asymmetric membrane comprising a tubular polymer film in combination with a tubular braid on which the film is supported, requires the braid be macroporous and flexible, yet sufficiently strong to withstand continuous flexing, stretching and abrasion d... | 03/12/2002 |
| 6325928 | Immersed membrane element and module A filtering element has ultrafiltration or microfiltration hollow fibre membranes extending horizontally between a pair of opposed horizontally spaced, vertically extending headers. Side plates extending between the pair of vertically extending headers de... | 12/04/2001 |
| 6319411 | Method of maintaining clean vertical skeins of hollow fiber membranes and system therefor This invention teaches a system and method to improve the renewal of water being filtered and to prevent the accumulation of solids within a cassette of multiple vertical skeins of hollow fibers used in membrane filtration.... | 11/20/2001 |
| 6303035 | Immersed membrane filtration process A filtration process for filtering water with immersed microfiltration or ultrafiltration membranes in a batch mode includes repeated cycles comprising the steps of filling the tank to a level above the membranes, withdrawing permeate through the membrane... | 10/16/2001 |
| 6294039 | Potted header for hollow fiber membranes A filtration device is provided for withdrawing permeate essentially continuously from a multicomponent aqueous substrate containing growing microorganisms in a reservoir. A vertical skein of fiber is scrubbed with coarse bubbles which emanate from a conv... | 09/25/2001 |
| 6245239 | Cyclic aeration system for submerged membrane modules An aeration system for a submerged membrane module has a set of aerators connected to an air blower, valves and a controller adapted to alternately provide a higher rate or air flow and a lower rate of air flow in repeated cycles. In an embodiment, the ai... | 06/12/2001 |
| 6214231 | System for operation of multiple membrane filtration assemblies Limitation of the number of cassettes in an assembly currently used for the production of permeate is obviated by grouping plural cassettes into racks one or more of which may be isolated while permeate production from the remaining racks is uninterrupted... | 04/10/2001 |
| 6193890 | System for maintaining a clean skein of hollow fibers while filtering suspended solids The outer surfaces of hollow fiber membranes in a skein, or a bank or cassette of stacked skeins, are kept essentially free of solids by maintaining a substantially uniform flow of a stream of coarse bubbles through each of plural orifices in an aerator d... | 02/27/2001 |
