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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 962

J. Wanner, J. Chudoba, K. Kucman, and L. Proske; Control of activated sludge filamentous bulking-VII. Effect of anoxic conditions. Water Research :1447-1451, 1987

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The effect of anoxic conditions on the occurrence of filamentous organisms in mixed cultures was studied in laboratory activated sludge systems. It was repeatedly demonstrated that anoxic conditions are able to suppress the growth of some undesirable filamentous organisms, for instance, type 021N and Sphaerotilus natans. It was also found that severely filamentous mixed cultures had maximum rates of denitrification of nitrate respiration one order of magnitude lower than non-filamentous mixed cultures. On the basis of these finding it is concluded that some filamentous organisms cannot use nitrate nitrogen as an electron acceptor.