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| Number | Title | Issue Date |
| 7513999 | Ozonation of wastewater for reduction of sludge or foam and bulking control A system and method for the ozone treatment of wastewater is disclosed. The disclosed wastewater treatment system includes a high selectivity reactor coupled to an activated sludge treatment basin. The high selectivity reactor is adapted to receive a stream containi... | 04/07/2009 |
| 7404897 | Method for nitrogen removal and treatment of digester reject water in wastewater using bioaugmentation An efficient system and process for removing nitrogen from wastewater while enriching seed sludge in the mainstream treatment process. Bioaugmentation of seed autotrophic organisms facilitate the nitrification reactions by enhancing the rates of reaction advantageou... | 07/29/2008 |
| 7309432 | System and method for eliminating sludge via ozonation A system and method for the treatment and reduction of sludge via ozonation in a wastewater treatment process is disclosed. The sludge treatment system comprises: a sludge ozonation reactor coupled to an activated sludge treatment basin and adapted to receive a liqu... | 12/18/2007 |
| 7235178 | Process and assembly for the treatment of waste water on ships Process for treating waste water on ships in which the waste water is pretreated by surface filtration, the pretreated waste water being collected in a first tank acting as a mixing tank and optionally enriched with oxygen. The waste water from the first tank is con... | 06/26/2007 |
| 7153431 | Method and system for utilizing activated sludge in a ballasted flocculation process to remove BOD and suspended solids A method and system for treating water or wastewater to remove both soluble BOD and suspended solids. The method entails a ballasted flocculation process where a flocculant and insoluble granular material is added to the water or wastewater to be treated causing sol... | 12/26/2006 |
| 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 |
| 6953837 | Factor VIII/vWF complexes and compositions There is disclosed a method of recovering factor VIII/vWF-complex which is characterized in that factor VIII/vWF-complex from a protein solution is bound to a cation exchanger and is recovered by step-wise elution of factor VIII/vWF-complex, which particularly conta... | 10/11/2005 |
| 6872312 | Method of using high molecular weight water soluble polymers in membrane bioreactor systems An activated sludge process for the clarification of wastewater comprising introducing the wastewater into a reactor where microorganisms consume organic material in the wastewater to form a mixed liquor comprising water, the microorganisms and an activated sludge; ... | 03/29/2005 |
| 6824684 | Wastewater treatment method and apparatus According to this wastewater treatment apparatus, wastewater can be treated by novel action by a foaming tank 7 in comparison with a treatment method solely using a biological treatment tank 1 constituting an aeration tank. That is, wastewater can be t... | 11/30/2004 |
| 6602417 | Process for the treatment of waste water containing specific components e.g. ammonia A process is described for the biological treatment of waste water containing a specific component such as ammonia, wherein the waste water together with surplus sludge from an activated sludge reactor is treated in a bioaugmentation reactor, applying a h... | 08/05/2003 |
| 6585895 | Wastewater treatment process There is provided a process for treating industrial wastewater that substantially eliminates the generation of excess solids in the system requiring mechanical removal. The wastewater undergoes an equalization step wherein hydraulic flow is smoothed and t... | 07/01/2003 |
| 6383379 | Method of preparing a microbial culture for wastewater treatment A method of preparing a microbial culture for wastewater treatment comprising the steps of supplying an aerated material derived from an aeration tank (13) to a bioreactor (17) and cultivating a microorganism existing in the aerated material by adding a c... | 05/07/2002 |
| 6383387 | Method for treating organic waste water A method and apparatus are disclosed for treating an organic waste water which are capable of utilizing compact equipment by reducing the quantity of a sludge to be treated. Organic waste water (A) is subjected to an aerobic biological treatment in a biol... | 05/07/2002 |
| 6251277 | Method and device for purifying protein containing waste water The invention relates to a method for purifying protein containing waste water, In which a) a first insoluble material is caused to form in the waste water, b) the mixture obtained in step a) is separated to form pre-purified waste water, c) the pre-purif... | 06/26/2001 |
| 6117323 | Process for the biological treatment of wastewater with periods of biomass starvation A biological treatment of wastewater from intermittent and/or sporadic sources is described. The process includes the step of: maintaining treated wastewater effluent and biomass in a quiescent state without stirring, aeration or agitation during biomass ... | 09/12/2000 |
| 6113788 | Wastewater treatment process A wastewater treatment process having improved solids separation characteristics and reduced biochemical oxygen demand (BOD) in the purified wastewater comprising the steps of: passing wastewater through a main aerobic biological oxidation zone and therei... | 09/05/2000 |
| 6099731 | Method and apparatus for treating water A process for treating a water containing chlorinated organic compounds, wherein a microorganism is introduced from a degradation tank to a separation tank and an energy source is supplied to the microorganism separated in the separation tank. A water-tre... | 08/08/2000 |
| 6086766 | Process and apparatus for biological treatment of aqueous organic wastes A process for reducing the amount of excess sludge by aerobically treating an aqueous organic waste in an aeration tank in the presence of a biosludge containing aerobic microorganisms, subjecting the resulting mixed liquor to a solid/liquid separation, t... | 07/11/2000 |
| 6077430 | Method for eliminating phosphorous contained in effluents This method measures the soluble phosphorus concentration in the treated water for at least two different places of the treatment line: at the intake of the secondary clarification step to obtain a measurement P1 and at the outlet of the treatment line to... | 06/20/2000 |
| 5976375 | Process for reducing production of biomass during activated sludge treatment of pulp and paper mill effluents A process for reducing the production of biomass during activated sludge treatment of pulp and paper mill effluents, involving a conditioning of the recycled activated sludge (RAS) prior to its return into the aeration tank is described. The conditioning ... | 11/02/1999 |
| 5972220 | Pre-thickened aerobic digester system An aerobic treatment process is operated to reduce overall oxygen requirements, to maintain general pH balance and to produce a low-coliform solids effluent. From the system's clarifier a slurry of concentrated solids is moved to a premix basin, where the... | 10/26/1999 |
| 5900150 | Method of purifying waste water biologically A method of purifying waste water biologically, in which at least one biological reaction is performed in at least one biological reactor containing microorganisms in activated sludge, and the waste water is separated from the activated sludge in a clarif... | 05/04/1999 |
| 5895577 | Method for continuous disintegration of activated sludge A method is described for the continuous disintegration of microbial sludge in a sewage clarification or sewage treatment plant wherein the microbial sludge is decomposed biologically by bacteria and the resultant sludge (5) is exposed to sonic radiation ... | 04/20/1999 |
| 5868934 | Method and apparatus for organic wastewater treatment capable of preventing decrease in permeation efficiency of submerged membrane without dilution A method and apparatus for wastewater treatment is provided which can prevent any decrease in permeation efficiency of a submerged membrane without involving an increase in operating cost and sludge generation, and which can treat high concentration organ... | 02/09/1999 |
| 5853588 | Wastewater treatment process A wastewater treatment process having improved solids separation characteristics and reduced biochemical oxygen demand (BOD) in the purified wastewater comprising the steps of: passing wastewater containing suspended solids and biodegradable organic subst... | 12/29/1998 |
| 5846425 | Methods for treatment of waste streams A method for treating wastewater is useful in treatment of biomass (sludge) resulting from wastewater treatment, particularly for biological sludges of aerobic, facultative and/or anaerobic origin. The invention relates fractionation of microorganisms and... | 12/08/1998 |
| 5811009 | Method and system for improved biological nitrification of wastewater at low temperature The present invention entails a method and system for enhancing biological nitrification in a wastewater treatment process. The process entails both a mainstream wastewater process and a sidestream process wherein the sidestream process produces an abunda... | 09/22/1998 |
| 5733455 | Wastewater treatment process A wastewater treatment process having improved solids separation characteristics and reduced biochemical oxygen demand (BOD) in the purified wastewater comprising the steps of: passing wastewater containing suspended solids and biodegradable organic subst... | 03/31/1998 |
| 5651891 | Wastewater treatment process A wastewater treatment process having improved solids separation characteristics and reduced biochemical oxygen demand (BOD) in the purified wastewater comprising the steps of: passing wastewater containing suspended solids and biodegradable organic subst... | 07/29/1997 |
| 5578214 | Apparatus and method for waste water treatment utilizing aerobic and anaerobic microorganisms and capable of exhaust gas treatment A waste water treatment apparatus is provided which can treat a high-concentration waste water containing persistent chemical substances including nitrogen and surfactant simultaneously with small amount of exhaust gases and is yet simple in construction.... | 11/26/1996 |
| 5543051 | Biological phosphorus removal from waste water A method for waste water (1) treatment comprising the steps of: (a) combining waste water (1) with activated sludge (4) under anaerobic conditions; (b) transferring the products of step (a) to a container (B); (c) aerating the contents of the container (B... | 08/06/1996 |
| 5514278 | Counterflow microbiological processes A multistage biological treatment method receives material to be treated, and passes the material through multiple reactors. From each reactor some of the contents are removed and separated, and the biomass is moved into the previous stage while the mater... | 05/07/1996 |
| 5492624 | Waste treatment process employing oxidation Processes for the treatment of organic waste are disclosed, including feeding the organic waste to an ATAD reactor and subjecting the organic waste to biological digestion in the ATAD reactor in order to produce a biomass and clear decant therein, oxidizi... | 02/20/1996 |
| 5441640 | Mobile waste treatment apparatus A sequencing batch waste treatment facility with pretreatment mixing and equalization by mixing with selectively bred bacteria to achieve a selected waste to bacteria ratio, wherein waste is treated and reduced to acceptable biological oxygen demand level... | 08/15/1995 |
| 5423988 | Method and apparatus for treating developer-containing waste water at multiple biological treatment stages Developer-containing waste water is subjected to a multi-stage biological treatment. A waste water treatment apparatus for carrying out a two-stage biological treatment has an adjustment tank for receiving raw waste water and for preliminarily adjusting w... | 06/13/1995 |
| 5393427 | Process for the biological treatment of wastewater A process and installation for the removal of organic matter, phosphate ions and nitrogenous compounds from sewage wastewater. The installation comprises a raw sewage feed line 12 shown feeding into a primary separation basin 14. The primary separation ba... | 02/28/1995 |
| 5376275 | Wastewater treatment An activated sludge treatment process is disclosed wherein a sewage sludge component is fermented for a period of at least 15 days to form soluble carbonaceous substrates, the fermented sludge component is contacted with influent sewage to form a conditio... | 12/27/1994 |
| 5356537 | Method and apparatus for treating waste water A process and apparatus is disclosed for treating waste water. After treatment, essentially no sludge remains for disposal. The treatment includes mixing the waste water with activated sludge solids in an aeration tank (15). The mixed liquor from the tank... | 10/18/1994 |
| 5348655 | Method for increasing the capacity of sewage treatment plant The present invention is directed to a method for increasing the capacity of a sewage treatment plant. In the method, oxygen is injected into the recycle sludge stream from the settling tank prior to introducing the recycle sludge stream into the secondar... | 09/20/1994 |
| 5334313 | Reduction of acrylonitrile in wastewater from the production of ABS plastic A process is disclosed for treating wastewater from a polymerization process. The wastewater contains volatile residual monomer, for example acrylonitrile monomer. The method includes the steps of pretreating the wastewater with an amount of oxygenated wa... | 08/02/1994 |
