What Is Your Biology Telling You? - Yeast

  • MDG
  • October 21, 2015


Yeast are not commonly found in activated sludge, but may grow due to the following:
  • Low pH in the system
  • Phosphorus Deficiency
  • Fermentative Conditions
Yeast may also sometimes come in through the “front door” from industrial processes. As with all other organisms, ranking and abundance through microscopicevaluation is a critical step. Yeast can be identified by their budding characteristics. If yeast is found at a common abundance, the next step is to determine the cause and required action if needed.


  1. Jenkins, R.D. (2004). 3rd Edition Manual on the Causes and Control of Activated Sludge Bulking, Foaming, and Other Solids Separation Problems. Boca Raton: CRC Press.