Abstract: An apparatus for aerobic biological treatment of waste water and the like includes a tank configured to retain waste water therein, and a wheel rotatably mounted in the tank. The wheel includes a plurality of chambers arranged in axial succession about the circumference of the wheel. The chambers include openings which are oriented generally upwardly and emerge from the waste water adjacent a top dead center position of the wheel and are oriented generally downwardly and submerged in the waste water adjacent a bottom dead center position of the wheel. An air drive mechanism rotates the wheel, and an air pipe communicates with the air drive mechanism, and is disposed generally below the wheel, and is configured to release air bubbles therefrom after the bottom dead center position. A plurality of bubble connectors are connected with and protrude radially outwardly from the wheel at locations preceding the openings, and are shaped to guide the bubbles from the air pipe through the openings into the chambers.

Abstract: An apparatus for aerobic biological treatment of waste water and the like includes a tank configured to retain waste water therein, and a wheel rotatably mounted in the tank. The wheel includes a plurality of chambers arranged in axial succession about the circumference of the wheel. The chambers include openings which are oriented generally upwardly and emerge from the waste water adjacent a top dead center position of the wheel and are oriented generally downwardly and submerged in the waste water adjacent a bottom dead center position of the wheel. An air drive mechanism rotates the wheel, and an air pipe communicates with the air drive mechanism, and is disposed generally below the wheel, and is configured to release air bubbles therefrom after the bottom dead center position. A plurality of bubble connectors are connected with and protrude radially outwardly from the wheel at locations preceding the openings, and are shaped to guide the bubbles from the air pipe through the openings into the chambers.

Abstract: The invention proposes a device for purifying waste water using a biological reactor (1, 4) for aerobic biological purification of waste water by the combined submerged contact aerator-activated sludge process. This device, following the biological reactor, is provided with a membrane filtration element (5). The combination of this biological reactor with a membrane unit produces a low-energy system for the production of epidemiologically safe water from biologically treated waste water.

Abstract: The invention proposes a device for purifying waste water using a biological reactor (1, 4) for aerobic biological purification of waste water by the combined submerged contact aerator-activated sludge process. This device, following the biological reactor, is provided with a membrane filtration element (5). The combination of this biological reactor with a membrane unit produces a low-energy system for the production of epidemiologically safe water from biologically treated waste water.

Abstract: A method for biological purification of wastewater in which nitrogen phosphorous compounds are biologically degraded in a biotank. The biotank is operated with suspended activated sludge and with fixed film biomass for producing purified water that is directly removable from the tank. Oxygen input to the biotank is controlled and regulated for operating the tank under different oxygen environmental conditions. An aerobic zone is formed near the water surface of the tank, and an anoxic zone is formed near the bottom of the tank. At least one transition zone connects the aerobic zone and the anoxic zone. The method produces a total concentration exceeding 3 kilograms of dry solids per cubic meter of suspended activated sludge and fixed film biomass in the tank volume that is used.

Abstract: The invention concerns an apparatus for the conversion of pollutants contained in effluents and effluent sludges, particularly of harmful substances and especially of excreta, into harmless substances with one or more hollow bodies rotatably arranged in a conversion pool or sludge aerating pool, which bodies emerge at one side of the pool completely out of the water or sludge and become completely immersed at the other side and whose part which is uppermost at the emerging side is lowermost at the immersion side, and vice versa. There is the danger, with such hollow bodies, that over time sludge settles in the hollow bodies. An anaerobic fermentation may take place in this settled sludge, during which the harmful substances rot but do not decompose.

Abstract: The invention relates to an aerating device for sewage and comprises a drum-like rotor which rotates in a trough and is divided, by axially-parallel partitions, into a plurality of outwardly-open radial chambers, the said partitions being equipped with peripheral outer surfaces having apertures so that during rotation of the drum a volume of air is trapped in each chamber. Internal baffels in said chambers act to direct the trapped air initially to the lagging portion of the chamber and then, past bottom dead center, to the leading portion of the chamber, thereby efficiently aerating the sewage.

Abstract: An arrangement for converting foreign and harmful matter found particularly in sewage water, in which the foreign matter is converted into harmless materials. A conversion tank with an intake for the water to be treated and having a drain for the treated water, is provided with rotating tubular members with perforations. These tubular members in the form of pipes, emerge on one side completely out of the water, whereas they are immersed on the otherside entirely into the water. The pipes are filled with materials which are insoluble in the water and which have a large surface area accessible to air and water. The pipes are carried by spoked wheels on a shaft, and they are paralel to each other as well as to the water surface. The perforations may be in the form of slots having parallel axes.