Fungi in activated sludge biocenosis.

It has been found that yeasts and yeast-like microorganisms are stable constituents of activated sludge biocenosis treating municipal wastewaters with a mixture of different industrial wastewaters at B upsilon values in the range of 1.3-1.7 kg COD m-3day-1 and B chi = 0.22-0.42 kg COD kg-1day-1. The number of these microorganisms reached about 10(4) cells mg VSS-1 and as typical species Saccharomyces cerevisiae and Candida famata can be considered. Considerably less numerous (4-8 cells mg VSS-1) was the mycoflora of high loaded treatment systems of petrochemical wastewaters (B upsilon = 10.3-14.1 kg COD m-3day-1 and B chi = 1.06-1.92 kg COD kg-1day-1) and municipal wastewaters with a mixture of aromatic amines (B upsilon = 1200-2400 mg COD l-1 day-1 and B chi = 0.43-0.94 mg COD mg-1day-1). Typical species for these sludges were Geotrichum candidum, G.klebahnii, G.sericeum, Trichosporon cutaneum and Sporobolomyces lactosus.