Characterization of filamentous microorganisms in rotating biological contactor biofilms of wastewater treatment plants

Filamentous microorganisms populations present in biofilms from three waste water treatment plants with a rotating biological contactor system have bee n studied. Results showed that filaments are an integral component of the b iofilms, and that they were made up by: Beggiatoa ssp., Haliscomenobacter h ydrossis, Sphaerotilus natans, Thiothrix ssp., and the 021N, 0803, 0914, 09 61, 1701, 1851, and 1863 Eikelboom's types. Beggiatoa ssp, was the most fre quent microorganism followed by S. natans and type 021N. Microthrix parvice lla, Gordona amarae (=Nocardia amarae), Nostocoida limicola (I, II, III), a nd 0041, 0092, 0211, 0411, 0581, 0675, 1702, and 1852 Eikelboom's types app ear infrequently.