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강명규,배정옥,이기종,이영하 忠南大學校環境問題硏究所 1993 環境硏究 Vol.11 No.-
To investigate the microfloral composition in activated sludge, more than six hundred bacterial and fungal strains isolated from influent sewage, return sludge and aeration tank of an activated sludge sewage treatment plant were identified to the genus level. During the holding period in the aeration tank development of diverse heterotrophic microbial populations occurred and bacterial and fungal numbers in the aeration tank were 10- to 100-fold higher than in the influent sewage and return sludge. A large number of Gram-negative rods, particularly Pseudomonas, Flavobacterium, Enterobacter, Klebsiella, and Alcaligenes were found to be the dominant genera in the aeration tank. The species of filamentous fungi Trichoderma, Aspergillus, Rhizopus and Lepiomitus, and various yeasts were frequently associated with activated sludge. The most commonly found yeast genera were Candida, Geotrichum, Saccharomyces, Torulopsis and Rhodotorula.