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| Number | Title | Issue Date |
| 8061689 | Disk diffuser with improved seal A flexible membrane disk diffuser having an improved arrangement for sealing the membrane to the diffuser body. An enlarged sealing bead on the circumference of the membrane fits in an annular channel on the diffuser body. A retainer ring threads onto the diffuser b... | 11/22/2011 |
| 8016272 | Retrievable diffuser module with truss construction A diffuser module and system for diffusing gas into liquid such as in aeration/mixing of wastewater. Each module has a header pipe and diffusers which receive gas from the header pipe. Each header pipe is equipped with a truss for enhanced structural strength and re... | 09/13/2011 |
| 8011643 | Diffuser assembly with buoyancy vessel A diffuser assembly with a buoyancy vessel and a chamber for buoyantly raising the diffuser assembly for maintenance work. The diffuser assembly has a support structure, diffusers connected to the frame, and a buoyancy vessel positioned on the frame, capable of alte... | 09/06/2011 |
| 7934704 | Retrievable diffuser module with internal ballast/buoyancy chamber A diffuser module and system for diffusing gas into liquid such as in aeration/mixing of wastewater. Each module has a header pipe and diffusers which receive gas from the header pipe. Each pipe is equipped with a smaller internal pipe arranged concentrically to pro... | 05/03/2011 |
| 7815974 | Gas diffuser membrane with coated substrate A flexible diffuser membrane for diffusing gas into a liquid includes a substrate covered wholly or partially by a thin fluorocarbon elastomer coating. The coating is applied after the substrate has been fully constructed and cured. The coating is then mixed with an... | 10/19/2010 |
| 7544286 | Method and apparatus for enhancing aquatic environments Submerged media useful with or without aeration and/or mixing to enhance an aquatic environment by promoting and retaining biogrowth. The media takes the form of a cluster of individual flexible elements having free ends. The media are submerged in a liquid such as ... | 06/09/2009 |
| 7044453 | Membrane diffuser with uniform gas distribution A flexible diffuser membrane is provided with a unique system of perforations arranged to result in uniform distribution of gas even though the membrane deflects to different extents or the submergence varies in different parts of the membrane. The perforations are ... | 05/16/2006 |
| 7041219 | Method and apparatus for enhancing wastewater treatment in lagoons A method and apparatus for building a lagoon based advanced treatment system or upgrading an existing lagoon system for advanced treatment of wastewater. The lagoon is provided with a baffle to create a complete mix zone in which an aeration system and bioconcentrat... | 05/09/2006 |
| 6863810 | Wastewater aeration system with lift out lateral pipes and diffusers A wastewater aeration system that can be pivoted upwardly to expose the treatment basin floor for removal of accumulated grit or other solids. The aeration system includes a blower and a rigid or flexible supply conduit extending into the basin to supply lateral pip... | 03/08/2005 |
| 6770200 | Method and apparatus for enhancing wastewater treatment in lagoons A method and apparatus for building a lagoon based advanced treatment system or upgrading an existing lagoon system for advanced treatment of wastewater. The lagoon is provided with a baffle to create a complete mix zone in which an aeration system and bioconcentrat... | 08/03/2004 |
| 6543753 | Air diffuser membrane treated with biocide A fine bubble diffuser membrane used in the aeration of wastewater is treated with biocide to inhibit growth and accumulation of biological materials on the membrane. The membrane may be constructed of EPDM rubber or urethane. The biocide may be carbolic ... | 04/08/2003 |
| 6497402 | Diffuser mounting system for aeration of liquids A diffuser mounting assembly includes two saddle sections having integral outlet fittings to which elongated air diffusers can be mounted for aerating liquid in a basin. Air laterals installed in the basin receive the saddle sections on opposite sides so ... | 12/24/2002 |
| 5846412 | Diffuser construction and mounting arrangement An improved air diffuser and mounting arrangement for mounting diffusers on submerged air laterals in a wastewater treatment system. The diffuser is formed form a cylindrical pipe which is flattened on most of its length but left partially cylindrical for... | 12/08/1998 |
| 5788847 | Diffuser construction and mounting arrangement An improved air diffuser and mounting arrangement for mounting diffusers on submerged air laterals in a wastewater treatment system. The diffuser is formed form a cylindrical pipe which is flattened on most of its length but left partially cylindrical for... | 08/04/1998 |
| 5587114 | Aeration system employing retrievable aeration modules An aeration/mixing system for applying air or another gas to wastewater or another liquid. A main air supply pipe receives air from a blower and directs the air to a plurality of aeration modules each including a submerged conduit and a plurality of diffu... | 12/24/1996 |
| 5133876 | Method and apparatus for aerating wastewater using sequential aeration of different zones A wastewater aeration system in which the volume of wastewater is divided into a plurality of different zones which are aerated sequentially one at a time with the full capacity of the blower supply sized for oxygenation needs. In the case where the oxyge... | 07/28/1992 |
| 5059358 | Tubular diffuser with adjustable plug A tubular membrane diffuser for a wastewater aeration system. The diffuser includes a pipe having spaced apart outlet ports and a porous membrane sleeved around the pipe for discharging air in bubbles. An adjustable plug can be located at the outboard end... | 10/22/1991 |
| 5032325 | Plastic coarse bubble diffuser for waste water aeration systems A generally tubular coarse bubble diffuser for aerating waste water is constructed of polyvinyl chloride or a similar plastic material. The diffuser body has a main section with flat side walls through which outlet ports are formed. The opposite ends of t... | 07/16/1991 |
| 5013493 | Staggered diffuser arrangement for waste water treatment systems A wate water aeration system in which tubular diffusers are arranged with short and long diffuser assemblies alternating along the length of each air lateral submerged in the treatment basin. This arrangement provides application of air which is widely di... | 05/07/1991 |
| 4563277 | Apparatus for aerating and mixing waste water A plurality of aerators are arranged in a preselected pattern on the floor of a basin or lagoon containing waste water. Compressed air is supplied to the aerators by aeration pipes anchored by hanger brackets to the floor of the basin. Each aerator has a ... | 01/07/1986 |
| 4243521 | Method and apparatus for aerobically treating wastewater Wastewater is directed into an aerobic treatment tank which is divided by a partition into an aeration chamber and a settling chamber. The waste material is aerated in the aeration chamber and then directed into the settling chamber. Any solids in the set... | 01/06/1981 |
