間欠曝気式窒素除去における処理槽内の細菌相〔間欠曝気式高率窒素除去法に関する研究-3-〕

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The role of bacteria in organic decomposition, nitrification, and denitrification in a waste treatment tank, in which the nitrogen was removed by intermittent aeration, was determined by examining the bacterial number and the flora present. The numbers of total heterotrophic bacteria, nitrifying bacteria, and denitrifying bacteria in the treatment tank were ca. 107-108 cells/ml, 104-106 cells/ml, and 106-107 cells/ml, respectively. The number of nitrifying bacteria was rather high in a treatment tank to which a high concentration of wastewater was added, and where anaerobic and facultative anaerobic conditions were repeated alternately. Among the isolated heterotrophic bacteria. Alcaligenes, Acinetobacter, Coynebacterium, and Bacillus were dominant, although some difference in the percentage of these groups were found according to the varying concentrations of added wastewater. During the course of development of excess slu dge in effluent, no difference in bacterial number was observed, whereas the proportions of Pseudomonas and Alcaligenes increased.
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