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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 6675

Henryk Klimowicz; The microfauna of activated sludge Part II. Assemblages of microfauna in block aeration tanks. Acta Hydrobiologica (Acta Hydrobiol.) 14(1):19-36, 1972

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Investigations were carried out on the microfauna of activated sludge proceeding from block aeration tanks. 67 species of microfauna were identified, 34 of which belonged to Ciliata, 26 to Rotatoria, 6 to Rhizopoda, and 1 to Flagellata. Moreover, individuals belonging to Flagellata, Nematodes, Gastrotricha, Oligochaeta, and Arachnida were found, but their species could not be determined. In the two aeration tanks the same species of microfauna prevailed, but the periods of their dominance were not always simultaneous. Microscopic analyses of activated sludge collected at the same time from two aeration tanks, treating the same sewage in similar technological parameters, always showed a different specific composition of microfauna. The variations in numbers, and the complete disappearance or appearance of individuals representing the particular microfauna species, increased with rising temperature of the environment. The occurrence of microfauna in block aeration tanks shows that the content of oxygen exceeding 2.7 mgO2/l does not noticeably improve the course of the process of sewage purification.