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| Number | Title | Issue Date |
| 4352738 | Anaerobic filter In the operation of a recycling anaerobic filter for treating aqueous waste streams, the rate of production of methane is measured continually at frequent intervals and the COD feed rate is varied to maintain a predetermined, timed, relationship between t... | 10/05/1982 |
| 4351729 | Biological filter and process A biological filter apparatus, and process for using the same, wherein organic pollutants in a waste water stream may be biologically degraded by a biomass of suitable microorganisms located on the surface of a packing. The filter comprises a sealed vesse... | 09/28/1982 |
| 4344848 | Procedure for purifying waste water in a floating layer reactor The invention disclosed concerns a procedure for purifying waste wter containing chlorinated phenolic compounds, such as the bleaching effluent of a sulphate cellulose pulp mill. The purification is carried out biologically in a floating bed reactor which... | 08/17/1982 |
| 4338196 | Biological treatment of a formaldehyde-containing waste water contacted with a biomass together with a nitrogen compound In the treatment of a waste water containing formaldehyde by a method which involves introducing the waste water into a biological digestor into which there is also introduced another stream comprising a nitrogen-containing compound, especially ammonia or... | 07/06/1982 |
| 4334998 | Process for placing a gas phase, at least one liquid phase, and at least one comminuted solid phase in contact The invention relates to contact-making between a gas phase, at least one liquid phase, and at least one comminuted solid phase. The process uses a cell or compartment provided with at least one deflecting means such as the sloping wall 3 designed to impart an... | 06/15/1982 |
| 4332904 | Biochemical treatment by microorganic method A vessel capable of passing a liquid therethrough is packed with a support having at least hydrophilicity and microorganism cells are inoculated to the support, retained and cultivated therein. A reaction substrate is fed to the vessel and brought into co... | 06/01/1982 |
| 4284508 | Methane production by attached film A method for purifying wastewater of biodegradable organics by converting the organics to methane and carbon dioxide gases is disclosed, characterized by the use of an anaerobic attached film expanded bed reactor for the reaction process. Dilute organic w... | 08/18/1981 |
| 4277341 | Water treatment discharge means A lagoon for wastewater treatment, having an aeration zone and a quiescent zone is provided with a collector in the form of a horizontally extending submerged tube filled with biological reaction media and having an array of openings on its underside for ... | 07/07/1981 |
| 4271013 | Method and apparatus for removing biodegradable compounds from wastewater A method for removing biodegradable compounds selected from the group comprising: phenolics, free and fixed ammonia compounds, thiosulfates, cyanides, thiocyanates, sulfides and the like from a feed wastewater. The method comprises the steps of treating t... | 06/02/1981 |
| 4255266 | Water purification process In a biological water purification process polluted water, including surface water to be made potable, sewage water or industrial water, is percolated through a submerged fixed bed of granular material such as activated carbon, chamottes, raw clays, etc.,... | 03/10/1981 |
| 4253966 | Process for biological denitrification of waters Water is denitrified by passage through a porous bed of fired clay containing 1-5 parts per thousand of Mo, preferably added to the clay before firing in the form of Mo containing acid or an alkaline salt of such acid.... | 03/03/1981 |
| 4251359 | On-site wastewater treatment system An on-site wastewater treatment system is disclosed suitable for domestic or other sewage. After separation of the settleable solids from incoming wastewater by means of a septic tank or other means the effluent is passed into a basin holding particles of... | 02/17/1981 |
| 4240906 | Liquid media clarifier A composition for enhancing the clarity of liquid media, for example, in aquariums comprises a major amount by volume of vermiculite particles and a minor amount of filter medium particles. The vermiculite acts to improve the propagation of aerobic bacter... | 12/23/1980 |
| 4237003 | Process for biological purification of liquid wastes An improved process for biological purification of liquid wastes is provided. The improvement is obtained by utilizing anaerobic bacteria in the presence of extra-cellular enzymes produced by Gram-positive bacteria and separated from said Gram-positive ba... | 12/02/1980 |
| 4225431 | Process and apparatus for the treatment of aqueous waste materials A process and apparatus for the treatment of aqueous waste materials or effluents, particularly the aqueous waste materials of bottling plants and installations, in which a trickling element is employed for the basic rough processing to effect the removal... | 09/30/1980 |
| 4192742 | Process and apparatus for the biological treatment of waste water Waste water to be treated is introduced into an enclosed gas tight oxygenation chamber. An oxygen-containing gas is also introduced into the oxygenation chamber, at a pressure higher than atmospheric pressure, such that oxygen from the gas is dissolved in... | 03/11/1980 |
| 4192741 | Process for treating sewage effluent The process described herein calls for reaction of the effluent as it flows through the plant. The use of high and low pressure venturies (Barnoulli's equation) are included in this design. The purpose of this high pressure venturi (wider reaction pipe) is to ... | 03/11/1980 |
| 4188289 | Process for purification of sanitary waters A purification process for removal of suspended solids, carbonaceous material, nitrogenous material, phosphorus, refractory organics, bacteria and viruses comprises of combining and carrying out the various biochemical and chemical reactions and separatio... | 02/12/1980 |
| 4184947 | Treatment of sewage effluent Effluent from a sewage treatment system, such as a septic tank, a settling chamber, or a settling pond is distributed in or over a leaching bed and is percolated in the presence of entrained air through a filter bed that includes a layer of soil with chem... | 01/22/1980 |
| 4169049 | Waste water purifying procedure Waste water purifying procedure intended to be used in treatment of waste water containing aromatic compounds. In a biofilter in a layer containing bark of wood there is formed a bacterial population comprising one or several of the bactery strains deposi... | 09/25/1979 |
| 4167479 | Process for purifying waste waters A purification process for the removal of biodegradable suspended and dissolved organic solids, nitrogenous compounds and phosphates from contaminated water by biological and chemical reactions carried out simultaneously in active media of a biological wa... | 09/11/1979 |
| 4139456 | Process for oxidation treatment of FE2+ in waste water Improved process for the oxidation of the Fe2+ in waste water is disclosed. The process is especially advantageous when applied to low pH acidic waste waters containing substantial amount of the Fe2+ and is carried out by making use ... | 02/13/1979 |
| 4137062 | Filtration with a compostable filter medium A method and apparatus for treating wastewater such as sewage are disclosed. Designed principally for complete on-site wastewater treatment and disposal, the system separates wastewater into liquid wastes and solid wastes by filtration, treats the liquid ... | 01/30/1979 |
| 4080287 | Activated carbon treatment of oxygenated wastewater An integrated system for treating wastewater containing biodegradeable organic contaminants by oxygenation thereof in the presence of activated sludge in an enclosed oxygenation zone with at least 50% oxygen feed gas and removal of the residual organic co... | 03/21/1978 |
| 4043936 | Biological denitrification of high concentration nitrate waste Biological denitrification of nitrate solutions at concentrations of greater than one kilogram nitrate per cubic meter is accomplished anaerobically in an upflow column having as a packing material a support for denitrifying bacteria.... | 08/23/1977 |
| 4039437 | Treatment of sewage The invention provides a method of, and apparatus for, treating sewage flowing through a sewer, wherein an oxygenating gas is introduced under pressure into the sewage and is dissolved therein and the thus oxygenated sewage is contact with a matrix of sol... | 08/02/1977 |
| 4026802 | Waste water treatment apparatus by biological action A biological waste water treating apparatus in which plural cylindrical filter beds suspended on an endless chain and the like at definite intervals are circulated in a treating tank containing waste water to perform the aerobic treatment of the waste wat... | 05/31/1977 |
| 4008159 | Renovation of waste water A waste water treatment system for the renovation of waste water includes a four stage treatment for removal of gross solids, suspended, colloidal and dissolved organic matter, dissolved nitrogenous material, phosphates odor, color, coliform and residual ... | 02/15/1977 |
| 4001108 | Method for natural biochemical decomposition of latrine Method for effecting the natural simultaneous biochemical decomposition of feces and urine involving the decomposition of the feces and the urine independently of each other and at different temperature but within a single apparatus. The urine is directed... | 01/04/1977 |
