The subject of this article is not in relation to a single bug, but rather a sometimes poorly understood concept regarding the aggregation of microbes. By general definition, pin flocs are flocs with a dimension of under 50 µm, which is much smaller than commonly observed in biological wastewater treatment processes.
From an operational perspective there are two common ways that pin flocs impact the settling characteristics of a biomass. The most recognized and diagnosed symptom of pin floc is rapidly setting biomass, often leaving behind a turbid supernatant due to low forgiveness for any dispersed growth in solution. In other
