4510243 Anaerobic digestion process of wastes containing cellulose

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    Biological Waste Treatment and Pollution Control


    P S E U D O M O N A S D E G R A D A T I O N O F H Y D R O C A R B O N S

    Ronald Olsen assigned to Microlife Technics lnc


    The present invention relates to an anaerobic digestion process of wastes containing cellulose, in which, after liquefying by bringing wastes con- taining cellulose in slurry state into contact with facultative anaerobic bacteria with pH adjusted between 6.5-8.0 and oxidation-reduction poten- tial controlled between -50-300 mV with oxygen supply, the liquefied slurry is then converted into methane and carbon dioxide by bringing it into contact with obligatory anaerobic bacteria to recover methane efficiently.

    Selected new bacteria of the genus Pseudo- monas, particularly the species Pseudomonas putida and Pseudomonas aeruginosa, which have the ability to utilize organic compounds from the generic groups aliphatic, cyclo aliphatic, aromatic and/or polynuclear aromatic hydrocarbons are described. The source of gene- tic materials facilitating degradation of the aromatic compounds are metabolic plasmids. In particular, Pseudomonas putida or other Pseudomonas obtained from soil samples and having a non-transmissible and stable ability to degrade hexane (as well as related aliphatic hydrocarbons) are used as starting strains to produce the new bacteria. Transconjugal mating and selection for these genetic traits resulted in the production of bacteria capable of utilizing representative compounds of all the generic groups of the previously listed organic com- pounds. The bacteria are useful for waste degradation.

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    R O T A T I N G D I S K B I O T R E A T M E N T O F S Y N G A S

    W A S T E W A T E R

    Edward H Rowe, Lloyd J Parcell assigned to Texaco lnc

    A method for environmentally upgrading waste water containing formates, cyanides and ammonia is disclosed. Formates and cyanides are biodegraded by aerobic bacteria im- mobilized on the disks of a rotating disk con- tactor. Ammonia is air stripped. The present method eliminates the steam stripping stage of conventional processes as well as the lime addi- tion and precipitation stages.

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    A N A E R O B I C D I G E S T I O N P R O C E S S O F W A S T E S

    C O N T A I N I N G C E L L U L O S E

    Ryoich Haga, Masahiko Ishida, Yoji Odawara. Hitachi, Japan assigned to The Agency of Indus- trial Science and Technology

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    T R E A T M E N T O F O B N O X I O U S C H E M I C A L W A S T E S

    Joseph Colaruotolo, Robert L lrvine, Lloyd Ketchum. Wei-ch Ying assigned to Occidental Chemical Corporation

    This invention relates to the treatment of ob- noxious waste effluents, both industrial and municipal, such as chemical waste landfill leachates, chemical process wastewaters and other obnoxious waste effiuents by the use of microbial cultures, especially adapted to bio- degrade the obnoxious chemicals in the chemical wastes, such as activated sludge and inoculants for activated sludge, and the new inoculated ac- tivated sludges and their use in biological wastewater systems such as continuous and batch reactors.

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    P R O C E S S F O R T H E B I O L O G I C A L P U R I F I C A T I O N O F W A S T E

    W A T E R

    Gerhard Leismer, Gerhard Muller, Gunther Sell, Alexander Bauer, Schmitten, Federal Republic Of Germany assigned to Hoechst Ak- tiengesellschaft

    In a process for the biological purification of waste water by mixing a sludge-water mixture and air in an activation chamber charged con- tinuously with waste water, activated sludge and air and from which an equivalent quantity of sludge-water mixture is discharged, the sludge- water mixture is guided along with the air in the activation chamber so as to define at least one loop shape motion. In a further embodiment of the process that part o f thc sludge-watcr mixture that does not continue its loop shape course is submitted to a biological after-reaction, pre- ferably occurring in thc activation chamber, ~hite avoiding backmixing with the mixture m loop shape motion.