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5096579 Anaerobic digester
Biological Waste Treatment and Pollution Control
5096579 ANAEROBIC
by using a pair of controlling devices, a timer and an electric motor in combination. The electric motor rotates the distributor mechanism of the trickling filter in response to signals transmitted thereto by the first and second controller. The timer activates the first controller during operation to provide a SK value of between 25-500 ram/pass. During non-peak hours, the timer activates the second controller for flushing the biomass used in the trickling filter operation. The flushing is accomplished at SK values of between 200-1000 mm/pass. A method is also disclosed incorporating the above system.
DIGESTER
Jeff P Jordan, James D McElvaney assigned to Unisyn An anaerobic digester for digesting animal manure and other biologically degradable material contains support media for enhancing the contact between the microbes in the digesting mass and the available nutrients. The digester includes a novel fluid circulation and distribution system. The distribution system prevents build up of heavy material in the bottom of the digester and prevents agglomeration of light material at the top of the digester. The digesting fluid travels over a floating weir into an intake and impeller assembly. The impeller drives the fluid through a conduit located adjacent the floor of the digester. Nozzles in the conduit project the fluid downwardly toward the floor thus causing a sweeping action on the floor. Fluid then flows upwardly past the support media. Risers are provided at the ends of the conduit, which terminate in nozzles at the surface o f the digesting liquid. The nozzles direct the flow of digesting material back toward the fluid inlet and also sweep the corners of the digester to prevent material accumulation.
5098567 WASTE
WATER TREATING PROCESS
Takesh Nishiguchi, Kyoto, Japan assigned to Nishihara Environmental Sanitation Research Corporation Limited A waste water treatment process wherein an iron contactor or iron contactors are immersed in a treatment tank, into which waste water flows. In the treatment tank sulfate reducing bacteria are made to coexist with activated sludge or biofilters, wherein a velocity of flow of agitating stream on the outer surfaces of said iron contactor or contactors is set at 10 to 20 cm/sec, under an aerobic treatment. Iron ions are made to elute from said iron contactor or contaetors by utilizing electrochemical iron corrosion through the agency of oxygen concentration cells on the outer surfaces of said iron contactor or contactors on conditions that dissolved oxygen concentration in the treatment tank is 1 to 3.2 mg/l and the oxidation-reduction potential is -200 to 400 millivolts (mV). Under an anaerobic treat-
5096588 METHOD AND SYSTEM FOR OPTIMIZING THE OPERATION OF A TRICKLING FILTER Orris Albertson A method and system for optimizing the operation of a trickling filter. Optimization is obtained 526
5096579 ANAEROBIC
by using a pair of controlling devices, a timer and an electric motor in combination. The electric motor rotates the distributor mechanism of the trickling filter in response to signals transmitted thereto by the first and second controller. The timer activates the first controller during operation to provide a SK value of between 25-500 ram/pass. During non-peak hours, the timer activates the second controller for flushing the biomass used in the trickling filter operation. The flushing is accomplished at SK values of between 200-1000 mm/pass. A method is also disclosed incorporating the above system.
DIGESTER
Jeff P Jordan, James D McElvaney assigned to Unisyn An anaerobic digester for digesting animal manure and other biologically degradable material contains support media for enhancing the contact between the microbes in the digesting mass and the available nutrients. The digester includes a novel fluid circulation and distribution system. The distribution system prevents build up of heavy material in the bottom of the digester and prevents agglomeration of light material at the top of the digester. The digesting fluid travels over a floating weir into an intake and impeller assembly. The impeller drives the fluid through a conduit located adjacent the floor of the digester. Nozzles in the conduit project the fluid downwardly toward the floor thus causing a sweeping action on the floor. Fluid then flows upwardly past the support media. Risers are provided at the ends of the conduit, which terminate in nozzles at the surface o f the digesting liquid. The nozzles direct the flow of digesting material back toward the fluid inlet and also sweep the corners of the digester to prevent material accumulation.
5098567 WASTE
WATER TREATING PROCESS
Takesh Nishiguchi, Kyoto, Japan assigned to Nishihara Environmental Sanitation Research Corporation Limited A waste water treatment process wherein an iron contactor or iron contactors are immersed in a treatment tank, into which waste water flows. In the treatment tank sulfate reducing bacteria are made to coexist with activated sludge or biofilters, wherein a velocity of flow of agitating stream on the outer surfaces of said iron contactor or contactors is set at 10 to 20 cm/sec, under an aerobic treatment. Iron ions are made to elute from said iron contactor or contaetors by utilizing electrochemical iron corrosion through the agency of oxygen concentration cells on the outer surfaces of said iron contactor or contactors on conditions that dissolved oxygen concentration in the treatment tank is 1 to 3.2 mg/l and the oxidation-reduction potential is -200 to 400 millivolts (mV). Under an anaerobic treat-
5096588 METHOD AND SYSTEM FOR OPTIMIZING THE OPERATION OF A TRICKLING FILTER Orris Albertson A method and system for optimizing the operation of a trickling filter. Optimization is obtained 526