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| Number | Title | Issue Date |
| 4798669 | System for treating water with ozone A water treatment system having an apparatus (2) for the intensive pretreatment of the untreated water with ozone, having a downstream filter (3) with reducing action, and also having an apparatus (4) for the post-disinfection is improved in that the exce... | 01/17/1989 |
| 4752392 | Filtration apparatus having a plurality of filtration beds The present invention relates to a filtration apparatus composed of: a container comprising a central well and a number of radial individual chambers, each of said chambers comprising: a filtration bed placed on a plate, said plate defining with the botto... | 06/21/1988 |
| 4612286 | Acid hydrolysis of biomass for alcohol production A method of treating biomass having fermentable material is provided utilizing acid hydrolysis in a countercurrent diffusion treatment structure. By practicing the invention acid usage is minimized, pentose concentration in the hydrolysate solution is max... | 09/16/1986 |
| 4595499 | Gravity belt thickener and belt press combination A belt press for use in removing water from sewage sludge, and including a frame, a pair of belts for compressing sludge material therebetween, the said belts being water-permeable whereby water in said sludge may drain through said belts, and a gravity b... | 06/17/1986 |
| 4584099 | Sewage sludge filtering system A sewage sludge filtering system adapted for use with a polymer mixer for mixing a liquid polymer with sludge to produce an output mixture comprising coagulated sludge particles and water which comprises an elongated mesh hammock, a support arrangement fo... | 04/22/1986 |
| 4465593 | Recovery of metal from waste water by chemical precipitation Metals are removed from waste water by chemical precipitation and filtration. The system is controlled by a control system responsive to an ion specific electrode and a pH responsive electrode in a manifold that recycles filtrate to a reaction tank where ... | 08/14/1984 |
| 4397747 | Apparatus for plasma separation/exchange by double filtration The invention provides an apparatus for plasma separation/exchange by double-step-membrane filtration, namely separation of blood into plasma and a corpuscular fraction and separation of high-molecular-weight substances (e.g. gamma-globulin) in the plasma... | 08/09/1983 |
| 4358381 | Sludge condensation and dewatering system A sludge condensation and dewatering apparatus is described which comprises a condensation unit and a dewatering unit. The condensation unit comprises a flocculating reaction tank (1) for forming a sludge flock, a first holding tank (2) slantingly arrange... | 11/09/1982 |
| 4246114 | Aerobic waste treatment package An improved aerobic waste treatment package which both simplifies maintenance of the system and increases the interval between necessary maintenance through the use of a removable surge bowl which forms part of a centrally disposed, large capacity, surge ... | 01/20/1981 |
| 4234317 | Apparatus and method for fractionation of lipoproteins An apparatus and method for fractionating a liquid sample is disclosed. The liquid sample is generally blood plasma or blood serum from which it is desired to selectively remove low density lipoproteins while leaving behind high density lipoproteins. The ... | 11/18/1980 |
| 4214879 | Degassing apparatus A degassing apparatus which has a degassing head from which extends a tube; a shaft is rotated in the tube; a screw conveyor above intake holes of the tube conveys drill mud upward against a deflector disc at the open top of the tube; three rows of inward... | 07/29/1980 |
| 4193765 | Drycleaning assembly and method for removing impurities and residual moisture from an organic drycleaning solvent Residual moisture and sulfur and other residual reducing agent impurities contained in drycleaning solvents are removed by adding to the solvents an unsubstituted aromatic hydrocarbon or a halogen or alkyl substituted aromatic hydrocarbon and circulating ... | 03/18/1980 |
| 4187176 | Heavy metal separation from wastes employing irradiation Treatment plant for treating a fluid formed by waters and sludges and comprising a decanting system; a first centrifuging system for separating, on the one hand, the spent waters and, on the other hand, the sludges formed by organic compounds containing o... | 02/05/1980 |
| 4186089 | Method and apparatus for dewatering of sludgy substance Within a chamber having an inlet for admitting a sludgy substance for dewatering and an outlet for discharging the dewatered cake of the sludgy substance, there are disposed two laterally opposed filtration trains each consisting of a plurality of rotary ... | 01/29/1980 |
| 4156648 | Flotation device with pretreatment Methods and apparatus for treating water/wastewater to remove grit, susped and colloidal solids of organic and inorganic nature, microorganisms and surfactants. Dense suspended solids (grit) are first removed by a centrifugation process. The influent wat... | 05/29/1979 |
| 4141824 | Tangentially fed upflow sand filter method and apparatus Methods and apparatus for purifying water by filtration, according to which water is passed in an upward direction through one or more sand beds supported in towers, at a slow rate of flow so that the sand bed is not disturbed. The sand bed or layer is re... | 02/27/1979 |
| 4098697 | Apparatus for removing mercury from waste water A method for removing mercury from water contaminated with mercury comprising contacting water containing metallic mercury with finely divided anthracite coal. The mercury laden water can be first treated with sodium borohydride to reduce dissolved mercur... | 07/04/1978 |
| 4022691 | Mixing chamber for thickening sewage sludge by means of a flocculation agent combined with overflow drainage means A mixing chamber for thickening sludge, especially sludges in a sewage clarification plant by means of a flocculation agent in combination with an overflow drainage means wherein the sewage feed to the bottom of the mixing chamber enters a mixing zone and... | 05/10/1977 |
| 4021347 | Sewage treatment system An improved sewage treatment system including a horizontally elongated tank divided transversely into a primary, aeration compartment, a secondary, settling compartment and a tertiary, filtering compartment. In a first aspect of the invention, overflow of... | 05/03/1977 |
| 3989466 | Liquid-liquid extraction apparatus including fibrous strand packing Apparatus is provided for use in carrying out liquid-liquid extraction techniques, which apparatus includes an extraction column containing a unique solvent sorbing packing material, namely a plurality or bundle of elongated fibrous strands having first a... | 11/02/1976 |
| 3966611 | Filter In filters of the type in which a cake of solids deposited from a liquid slurry thereof on a generally horizontal filter medium is subjected to treatment involving passage of liquid through the cake while on the filter medium, means is provided for increa... | 06/29/1976 |
| 3966610 | Filter In filters of the type in which a cake of solids deposited from a liquid slurry thereof on a generally horizontal filter medium is subjected to treatment involving passage of liquid through the cake while on the filter medium, means is provided for increa... | 06/29/1976 |
| 3963615 | Multifiltration unit A multifiltration unit operated by pressure and/or vacuum and accommodating simultaneously in separate sealed chambers a number of disposable filter holders. The unit has a single cover with self-tightening means.... | 06/15/1976 |
