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| Number | Title | Issue Date |
| 7429329 | Hybrid chemical/mechanical dewatering method for sewage treatment plants A hybrid chemical/mechanical dewatering sewage treatment plant and method employing rapid sludge chemical dewatering technology in conjunction with slower conventional mechanical dewatering solids agglomeration and disposal methods to meet operating constraints and ... | 09/30/2008 |
| 7258790 | Controlled eutrophication system and process A controlled eutrophication system and process are disclosed. The system includes the combination of a partitioned aquaculture system in conjunction with an anaerobic digester. Wastewater containing pollutants, such as nitrogen and phosphorus, are fed to the partiti... | 08/21/2007 |
| 7211429 | Organic waste material treatment process An organic waste material treatment process comprising subjecting the organic waste material to conditions under which anaerobic digestion occurs followed by conditions under which aerobic composting occurs. Preferably, the organic waste material is pre-conditioned ... | 05/01/2007 |
| 7150832 | Apparatus for and a method of treating organic waste The apparatus comprises an anaerobic digester for receiving organic waste, an aerobic digester, and a feed pump for pumping effluent from the anaerobic digester to the aerobic digester. The digesters each comprise a reaction vessel and each reaction vessel has a spr... | 12/19/2006 |
| 7078229 | Method and apparatus for solids processing This invention provides a waste-processing system capable of processing high-solids wastes such as manure. This invention provides a compact U-shaped digester that allows for recycling of activated sludge to improve the efficiency of the process. Efficiency is also ... | 07/18/2006 |
| 7014768 | Process for removal and recovery of nutrients from digested manure or other organic wastes A process for removal and recovery of nutrients and recycling of water from digested manure or other organic wastes. A first step involves separating waste from an anaerobic digester into digested liquids, digested solids, and biogas. A second step involves precipit... | 03/21/2006 |
| 6929744 | Sludge treatment at a mesophilic temperature A method of treating sewage sludge comprises incubating raw sludge at a temperature in the mesophilic range to reduce the pathogen content of the sludge. ... | 08/16/2005 |
| 6921485 | Two phase anaerobic organic matter treatment and system The process and system may have an organic matter influent introduced into an acid reactor. The acid reactor may be maintained under conditions to facilitate creation of volatile acids in a fluid having water and suspended solids forming a sludge effluent. The sludg... | 07/26/2005 |
| 6908555 | Biosolids flow-through thermophilic treatment process A method of treating wastewater sludge includes pumping, continuously, raw sludge into a first digester and treating the raw sludge at a specific temperature of between about 51° C. to 60° C.; transferring the treated wastewater sludge to a batch tank; treating th... | 06/21/2005 |
| 6905601 | Method and device for anaerobically fermenting organic material Method for anaerobically fermenting biodegradable organic material, whereby this material is mixed with a quantity of already fermented material as an inoculum for the active anaerobic fermentation and this mixture is introduced at the top into a fermentation chambe... | 06/14/2005 |
| 6852293 | Process and device for waste pyrolysis and gasification A process is disclosed for the pyrolysis and gasification of waste materials, in particular of special and/or hazardous waste materials, comprising a gasification and melting step, a step of treatment of the mixture of the obtained gases, and a vitrification step, w... | 02/08/2005 |
| 6565744 | Waste water cleaning system The present invention provides treatment of wastewater containing oil, organic and inorganic industrial compounds, urea, and e.t.c. The resulting products will be purified water, dry fertilizer, pure carbomide, uncontaminated gas and liquid fuel, and othe... | 05/20/2003 |
| 6410283 | Conversion of sewage sludge into electric power A method for generating electricity in which sludge is anaerobically digested to form a gas mixture of methane and carbon dioxide and a residue of digested sludge. Water is removed from the digested sludge to form dewatered sludge, which, in turn, is gasi... | 06/25/2002 |
| 6368849 | Method and plant for the treatment of liquid organic waste A method and plant for the treatment of an organic waste material in liquid form, e.g. liquid manure from livestock, the method comprising filtering fibres and particles from the liquid, subjecting the liquid to anaerobic fermentation in a biogas reactor,... | 04/09/2002 |
| 6063355 | Method for treating wastes by gasification A method of treating wastes includes partially combusting the wastes in a fluidized bed reactor at a relatively low temperature followed by separate gasification of gaseous material and char from the first gasification in a separate relatively high temper... | 05/16/2000 |
| 6059972 | Apparatus for receiving and conditioning organic waste by anaerobic bioconversion A tank (1) for an apparatus for receiving and conditioning organic waste by anaerobic bioconversion, in particular, waste produced by restaurant kitchens and other facilities, includes a main enclosure wherein bioconversion takes place, and a secondary en... | 05/09/2000 |
| 5980858 | Method for treating wastes by gasification A method and apparatus for treating wastes by two-stage gasification recovers metals or ash content in the wastes in such a state that they can be recycled, and gases containing carbon monoxide (CO) and hydrogen gas (H2) for use as synthesis ga... | 11/09/1999 |
| 5916437 | Domestic sewage cleaning system The present invention provides treatment of domestic sewage containing oil. The resulting products will be purified water, dry fertilizer, and fuel (gas and liquid) containing no contaminants that could pollute the environment. After the initial settling ... | 06/29/1999 |
| 5914284 | System for generating methane gas from sewer sludge and process utilizing same A system is provided for processing a volume of human sludge with sea water and chemical reactants to generate methane gas and to reduce the volume by at least eighty percent (80%). This is by having a series of processing containers for receiving, holdin... | 06/22/1999 |
| 5900224 | Method for treating wastes by gasification A method and apparatus for treating wastes by gasification recovers metals or ash content in the wastes in such a state that they can be recycled, and gases containing carbon monoxide (CO) and hydrogen (H2) for use as synthesis gas of ammonia (... | 05/04/1999 |
| 5792313 | Method for evaporating process wastewater In the evaporation of process wastewater comprising a mixture of different types of wastewater, problems arise due to the formation of reaction products, so-called incrustations, which are difficult to separate. These incrustations clog up the evaporator,... | 08/11/1998 |
| 5788723 | Process for the high-temperature gasification of heterogeneous waste A process for the high-temperature gasification of possibly thermally pretreated heterogeneous wastes, in which oxygen is injected into the gasification bed with the aid of water-cooled oxygen lances. The oxygen is heated by an independent pilot flame and... | 08/04/1998 |
| 5681360 | Landfill gas recovery A process for concentrating and recovering methane and carbon dioxide from landfill gas includes absorption of commonly occurring pollutants using a reduced amount of carbon dioxide absorbent which itself may be an in situ derived and recoverable constitu... | 10/28/1997 |
| 5656042 | Environmentally acceptable process for disposing of scrap plastic materials A pumpable slurry of shredded scrap solid carbonaceous plastic-containing material that contains associated inorganic matter in admixture with a comminuted aluminosilicate-containing material having noncombustible constituents is reacted by partial oxidat... | 08/12/1997 |
| 5466383 | Process for treating sludges A process and apparatus for treating dried sludge comprising organic material, inorganic material and heavy mertals. The process comprises indirectly heating the sludge in the absence of oxygen to a temperature of from 300° to 550° C. for volatilization... | 11/14/1995 |
| 5464539 | Process for the production of hydrogen by microorganisms The present invention relates to a process for the production of hydrogen comprising treating in an anaerobic condition a substrate such as waste water including organic matter using sludge compost, whereby stable hydrogen generation at a higher efficienc... | 11/07/1995 |
| 5423895 | Sludge digesters with separate liquid chambers to buoy ballast members A gas-holding sludge digester is disclosed having a sideskirt which telescopes in a liquid chamber which is separate from a main digester tank and wherein the ballast is structured to increase gas pressure of the gas contained within the cover as the side... | 06/13/1995 |
| 5423891 | Method for direct gasification of solid waste materials Direct gasification of a high BTU content fuel gas from a hydrocarbon content solid waste material W which may include some glass content is effected by preheating heat carrier solids HCS in a flash calciner to a temperature capable of thermally cracking ... | 06/13/1995 |
| 5423992 | Chemically disinfected sewage sludge-containing materials A chemically disinfected sewage sludge-containing material comprising (1) an aqueous slurry of sewage sludge-containing material having a solids content in the range of about 10 to 30 wt. %; and (2) a chemical disinfectant comprising a water soluble silic... | 06/13/1995 |
| 5370715 | Waste destructor and method of converting wastes to fluid fuel Organic wastes of diverse types including toxic materials are converted to synthesis gas or molecular hydrogen or methanol and an inorganic solid residue by heating the material to 1200 ° C. or higher in the presence of steam in a chemically reducing atm... | 12/06/1994 |
| 5356540 | Pumpable aqueous slurries of sewage sludge A pumpable aqueous slurry of sewage sludge as produced by the steps of (1) dewatering sewage sludge to produce an aqueous slurry having a solids content of about 10 to 25 wt. %; (2) pretreating said aqueous slurry of sewage sludge to improve its slurrying... | 10/18/1994 |
| 5354345 | Reactor arrangement for use in beneficiating carbonaceous solids; and process A process for thermochemical beneficiation of carbonaceous solids including a fraction of particles of a size less than 1/4 inch across is provided. The process includes steps of providing a reactor vessel including therein a retaining structure operably ... | 10/11/1994 |
| 5292442 | Process for disposing of sewage sludge A process for disposing of sanitary sewage sludge by producing a pumpable slurry of sewage sludge with or without solid carbonaceous fuel and burning said slurry as fuel in a partial oxidation gas generator, furnace, or boiler. The aqueous slurry of sewag... | 03/08/1994 |
| 5290327 | Device and allothermic process for producing a burnable gas from refuse or from refuse together with coal A method for generating, from refuse or refuse in combination with coal, a fuel gas suited for public utility purposes wherein refuse and coal can be introduced into the process in any proportion one to the other. The method provides the steps of subjecti... | 03/01/1994 |
| 5288170 | Sludge/waste landfill method and system The present invention is a gas-to-energy system featuring beneficial use of sludge in a landfill. The system includes a device for disposing waste in the landfill and a device for disposing sludge in the landfill with the waste. The system also includes a... | 02/22/1994 |
| 5273556 | Process for disposing of sewage sludge A process for disposing of sewage sludge by heating and shearing an aqueous mixture of sewage sludge in a tubular-shaped processing means containing a plurality of rotating agitators to produce a pumpable aqueous slurry of sewage sludge. The aqueous slurr... | 12/28/1993 |
| 5266085 | Process for disposing of sewage sludge A process for disposing of sewage sludge comprising the steps of, (1) dewatering the sewage sludge to produce an aqueous slurry of sewage sludge having a solids content of about 10 to 30 wt. %; (2) simultaneously heating and shearing said dewatered sewage... | 11/30/1993 |
| 5264009 | Processing of sewage sludge for use as a fuel A process for disposing of sanitary sewage sludge by producing a pumpable slurry of sewage sludge with or without solid carbonaceous fuel and burning said slurry as fuel in a partial oxidation gas generator, furnace, or boiler. The aqueous slurry of sewag... | 11/23/1993 |
| 5245113 | Decontamination of PCB contaminated solids A method and apparatus for removal of PCBs or similar refractory organic substances from solid surfaces, such as soil or hardware, e.g., capacitors and transformers containing a charge or residue of PCB or similar fluids. Such toxic substances are volatil... | 09/14/1993 |
| 5234468 | Process for utilizing a pumpable fuel from highly dewatered sewage sludge A process for disposing of sewage sludge comprising the steps of, (1) dewatering the sewage sludge to produce amorphous sewage sludge having a solids content of about 28 to 50 wt. %; (2) heating said amorphous sewage sludge at about 150° F. to 510° F. i... | 08/10/1993 |
