Ref ID : 2645
Henryk Klimowicz; Biological studies of the sewage-treatment processes in the city of Torun. Polskie Archiwum Hydrobiologii (Pol.Arch.Hydrobiol.) 21(2):291-299, 1974
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Sewage, containing 66% of industrial waste and 34% of municipal sewage, was purified in the laboratory-type models, using the activated sludge method. During the whole period of the experiment. Ciliata were occurring in abundance, either sessile, or crawling among the flocs. The other species of microfauna, except Flagellata n. det. and Rotatoria, were present only sporadically. It serves to show that the sewage treatment process followed a normal course. The shortening of the sewage aeration time from 6 to 3 hr did not have any significant effects on the species composition, on the other hand, it has brought about considerable fluctuations in the number of individuals of each particular species. The results of bacteriological tests have shown a high degree of sewage purification in respect of all the experiments that had been carried out. The degree of destruction of psychrophilic and mesophilic bacteria averaged 83.1%. The B. coli titre of the influent sewage was 1x10E-6 and of the purified sewage flowing out from the settling tanks - 1x10E-5.