Abstract

AbstractScum biocenoses in activated sludge nutrient removal plants besides “nocardioform actinomycetes” and “Microthrix parvicella” frequently accommodate other conspicuous organisms such as Eikelboom types 0041/0675, 0581, 0092, and 1851, as well as “Nostocoida limicola”‐like organisms. In the scum fraction of high load plants often bacteria of type 1863 and non‐filamentous actinomycetes are found. Many of these morphologically distinguishable scum bacteria are so‐called morphotypes belonging to various groups or genera of bacteria as was proved by fluorescence in situ hybridization (FISH). Aim of this paper is to summarize our respective actual findings and the difficulties to provide practitioners with effective troubleshooting measures for these organisms.

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