What color of biomass indicates a problem in the RBC process?

The presence of white or gray biomass in the Rotating Biological Contactor (RBC) process indicates a problem because it suggests that the biomass is not healthy and may represent the presence of filaments or a condition known as "bulking." Healthy biomass typically appears darker, with green hues indicating active microbial growth essential for the treatment process. When the biomass loses its color and appears white or gray, it often points to a reduction in microbial activity or a dying microbial population, which can compromise the effectiveness of wastewater treatment. This scenario highlights potential issues such as nutrient deficiency, overloading, or toxic conditions, which can lead to ineffective treatment. Recognizing the color changes in biomass is critical for operational adjustments to ensure the RBC system functions properly.