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4948509 Anaerobic fermentation process
Biological Waste Treatment and Pollution Control
49485O9 ANAEROBIC FERMENTATION PROCESS Charles R Stack assigned to Charles Stack & Associates Inc An improved anaerobic fermentation process and apparatus for converting an influent liquid containing suspended organic matter to effluent gas and liquid products are provided. The influent liquid is introduced into and maintained in an anaerobic fermentation reactor containing anaerobic microorganisms at a temperature and a first pressure and for a time sufficient to form a gas containing methane and to form a liquid containing dissolved gas and suspended bacterial cell mass particles. The liquid is introduced into and maintained in a flotation vessel at a temperature, at a second pressure and for a time whereby gas dissolved in the liquid is liberated forming solution gas bubbles which rise and cause the suspended bacterial cell mass particles to be floated to the surface of the liquid. The floated bacterial cell mass particles are withdrawn from the surface of the liquid and from the flotation zone and recycled to the fermentation zone.
4948518 METHOD OF SEPARATING A SUSPENSION OF ACTIVATED SLUDGE AND SEWAGE WATER Hudai Turgay, Berlin, Federal Republic Of Germany assigned to Borsig GmbH A sedimentation tank for separating activated sludge from a suspension of activated sludge and sewage water, with an intake (1 I) for the suspension, an outlet (3) for the activated sludge at the
conical bottom, and a discharge (4) at the top for the sewage water that the activated sludge has been eliminated from. A pipe (7) that is open at the top and closed at the bottom by a floor (9) is accommodated at the center of the tank and an inlet (10) that communicates with the intake opens into the pipe in the vicinity of the floor. The central pipe extends above the surface (20) of the liquid in the tank, which is dictated by how much is leaving, is loosely surrounded by another pipe (8) that extends above and below the surface of the liquid, and accommodates an agitator (12) with a speed that can be set to shape the suspension at the top of the pipe into a paraboloid (21) of rotation, which extends to the edge and from which the suspension spills over the edge.
4950407 METHOD
FOR THE TREATMENT OF SEWAGE
Nathan Stahl, Pardes Hana, Israel assigned to American Israeli Paper, Mills Ltd The present invention relates to a method for the treatment of sewage in which the sewage is supplied to an aeration basin and treated therein by a biomass of aerobic microorganisms with simultaneous supply of air and addition of calcium phosphate. Thereafter, the mixture of the biomass and the deteriorations being the substrate of said microorganisms (M. L. S. S.) is forwarded to a clarifier, wherein the biomass and the effluent are separated from each other and withdrawn separately. The calcium super phosphate is advantageously added in an amount of 0.35 mg/g-2 mg/g M. L. S. S. as a 10% aqueous slurry.
49485O9 ANAEROBIC FERMENTATION PROCESS Charles R Stack assigned to Charles Stack & Associates Inc An improved anaerobic fermentation process and apparatus for converting an influent liquid containing suspended organic matter to effluent gas and liquid products are provided. The influent liquid is introduced into and maintained in an anaerobic fermentation reactor containing anaerobic microorganisms at a temperature and a first pressure and for a time sufficient to form a gas containing methane and to form a liquid containing dissolved gas and suspended bacterial cell mass particles. The liquid is introduced into and maintained in a flotation vessel at a temperature, at a second pressure and for a time whereby gas dissolved in the liquid is liberated forming solution gas bubbles which rise and cause the suspended bacterial cell mass particles to be floated to the surface of the liquid. The floated bacterial cell mass particles are withdrawn from the surface of the liquid and from the flotation zone and recycled to the fermentation zone.
4948518 METHOD OF SEPARATING A SUSPENSION OF ACTIVATED SLUDGE AND SEWAGE WATER Hudai Turgay, Berlin, Federal Republic Of Germany assigned to Borsig GmbH A sedimentation tank for separating activated sludge from a suspension of activated sludge and sewage water, with an intake (1 I) for the suspension, an outlet (3) for the activated sludge at the
conical bottom, and a discharge (4) at the top for the sewage water that the activated sludge has been eliminated from. A pipe (7) that is open at the top and closed at the bottom by a floor (9) is accommodated at the center of the tank and an inlet (10) that communicates with the intake opens into the pipe in the vicinity of the floor. The central pipe extends above the surface (20) of the liquid in the tank, which is dictated by how much is leaving, is loosely surrounded by another pipe (8) that extends above and below the surface of the liquid, and accommodates an agitator (12) with a speed that can be set to shape the suspension at the top of the pipe into a paraboloid (21) of rotation, which extends to the edge and from which the suspension spills over the edge.
4950407 METHOD
FOR THE TREATMENT OF SEWAGE
Nathan Stahl, Pardes Hana, Israel assigned to American Israeli Paper, Mills Ltd The present invention relates to a method for the treatment of sewage in which the sewage is supplied to an aeration basin and treated therein by a biomass of aerobic microorganisms with simultaneous supply of air and addition of calcium phosphate. Thereafter, the mixture of the biomass and the deteriorations being the substrate of said microorganisms (M. L. S. S.) is forwarded to a clarifier, wherein the biomass and the effluent are separated from each other and withdrawn separately. The calcium super phosphate is advantageously added in an amount of 0.35 mg/g-2 mg/g M. L. S. S. as a 10% aqueous slurry.