What characterizes the biological growth on Rotating Biological Contactors?

The biological growth on Rotating Biological Contactors (RBCs) is characterized by a gray to brown film of biological growth. This film consists of various microorganisms, including bacteria and other biological agents, that develop as a microbial community on the surface of the media used in the RBC system.

The gray to brown coloration indicates the presence of healthy microbial populations actively engaged in the treatment of wastewater. These microorganisms thrive in the biofilm, where they can effectively degrade organic matter and other contaminants present in the wastewater. This biofilm is crucial for the treatment process, as it facilitates the breakdown of pollutants through biological activity.

This characteristic distinguishes RBCs from other systems that may involve varying types of sludge or liquid states, which may not be as effective in biological treatment.