4437992 Process for controlling an aeration tank in an activated sludge sewage treatment

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New Patents

therein, regenerating said laden methanol stream by removing a portion of said acidic gases therefrom, so as to regenerate said wash stream, and recycling the regenerated wash stream.

4437866 POLLUTION HARNESS Harr Pweblo

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4437417 ENVIRONMENTALLY SAFE PROCESS FOR DISPOSING OF TOXIC INORGANIC CNCONTAINING SLUDGE Roy D Roberts assigned to Texaco Inc "~'~'~"~~

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A system and method for removing flue gasses like smoke from the atmosphere including mixing the smoke with water and then reducing the contaminants like bacteria from the water where the water is used in conjunction with chemical additives for removing entrained solids from the smoke.

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4437992

Toxic inorganic CN-containing sludge as produced by treating at least a portion of the water used to quench cool and/or scrub the hot raw effluent gas stream from a partial oxidation gasifier with a ferrous salt and a base may be disposed of by separating the inorganic CNcontaining sludge from the water and introducing the sludge into the partial oxidation gas generator in admixture with the hydrocarbonaceous fuel feed. Most of the cyanides are effectively destroyed in the reaction zone, and the ash components in the waste solids are recovered as slag from the generator. The separated water is upgraded by further treatment and recycled to the quench tank and/or gas scrubber. The subject process provides an environmentally safe solution for the otherwise costly problem of disposing of toxic sludge. When coal is included in the feed to the gas generator, any calcium in the sludge will act as a fluxing agent for the coal ash. A more fluid slag having a lower ash-fusion temperature is obtained. Because the partial oxidation gasifier may be run at a lower temperature while still producing molten slag, oxygen requirements may be reduced.

PROCESS FOR CONTROLLING AN AERATION TANK IN AN ACTIVATED SLUDGE SEWAGE TREATMENT Yukio Saito, Shunsuke Nogita, Syoji Watanabe, Kenji Baba, Hitachi, Japan assigned to Hitachi Ltd

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It is necessary for maintaining a good assimilating characteristic of microorganisms upon organic matter in an aeration tank to control a gas flow rate and a return sludge flow rate to optimum values. To this effect, it is necessary to know a concentration of organic matter or a organic load. In the present invention, it is confirmed that carbon dioxide (CO2) or nitrous oxide (N20) in an exhaust gas from the aeration tank has a correlation with it, and the aeration tank is controlled as N 2 0 or CO2 as an index.

New Patents Furthermore, it is confirmed that CO2 formation rate has a good correlation with COD or BOD in the upstream half section of the aeration tank, whereas N 2 0 formation rate has a good correlation with C O D or BOD in the latter half section thereof along sewage flow direction, and more improved control can be attained by a combination of both CO2 and N 2 0 indices.

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amount of oxygen needed to oxidize all components of the waste. An ignition source is provided. During incineration, the organic components are completely destroyed, water and carbon dioxide being the major combustion products. At the temperatures that develop, substantially all of the metal is converted to metallic oxides, which either remain in an underground cavity or sink harmlessly to the bottom of a body of water.

4437999 METHOD OF TREATING CONTAMINATED INSOLUBLE ORGANIC SOLID MATERIAL Sherman T Mayne assigned to Gram Research & Development Co The method of feeding an insoluble organic solid material in the form of an organic resin or biological matter containing contaminating material such as radioactive waste from a nuclear facility or from treatment of animal or plant tissue in a laboratory or medical facility into a vessel containing water and to which ultraviolet light and ozone, preferably by sparging, are applied while the water is being agitated to distribute the ozone. The ozone oxidizes the organic resin or biological material, which disintegrates on oxidation substantially into water and carbon dioxide, leaving substantially no resin or biological material after treatment by the ultraviolet light and ozone for a prescribed period of time, and leaving the contaminant material as a precipitate or in solution in the remaining water or as an escaping gas, in any of which forms it can be readily separated from the water for disposal or further treatment.

4438708 COMPLETE INCINERATION OF WASTE MATERIAL

4439318 SYSTEM FOR TREATING RADIOACTIVE WASTE Masaru Hayashi, Atsushi Tagusagawa, Fumiaki Komatsu, Yoshihisa Sawada, Yorihisa Sakaki, Tokyo, Japan assigned to Kobe Steel Ltd

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A system for treating radioactive waste employing a rotary mechanism which contains in its rotational path of travel a number of stages for the treatment, i.e., a stage of condensing a slurry of radioactive waste, a stage for drying the condensed waste and a stage for storing dried waste temporarily for feeding to a melting furnace. The rotary mechanism employs a number of containers for transferring the radioactive waste to and from the respective stages along the rotational path o f travel.

Russell E Duff assigned to S-Cubed

4439~3 APPARATUS FOR CONDITIONING BIOINJURIOUS WASTE Waste materials are deposited in a subsurface cavity, either underground or underwater. The wastes are supplied with liquid oxygen in an amount in excess of the estimated theoretical

Herbert Brunner, Bernhard Christ, Wilhelm Henss, Werner Pfeifer, Klaus Scheuermann, 6450 Hanau 9, Federal Republic O f Germany