Yeast are generally rare in biological wastewater treatment processes, but may enter the treatment processes through the influent, sludge return side-streams, or grow within the wastewater treatment plant itself at low pH values.
Yeast are eukaryotic, single-cell organisms that are members of the fungus kingdom. Thousands of individual species of yeast are recognized with varying morphological characteristics (egg shape, spherical, etc.). Most species of yeast reproduce through a process called mitosis (genetically identical cells) in which an asymmetric process recognized as budding occurs. The facultative fermentative characteristics of yeast have been used by humans for thousands of years in the production
