What does a high sulfur concentration in a rotating biological contactor bio-film appear as?

A high sulfur concentration in a rotating biological contactor bio-film is typically indicative of the presence of sulfur-reducing bacteria, which thrive in anaerobic conditions. These bacteria can lead to the formation of a bio-film that appears chalky white. This coloration results from the precipitation of sulfur compounds, such as sulfides, which can accumulate in the bio-film.

Recognizing the appearance of bio-films is essential for wastewater operators because it can provide insights into the biological processes occurring within the treatment system. High sulfur concentrations can impact the efficiency of the treatment process and may require attention to maintain optimal operation. Monitoring and managing such bio-film characteristics allows operators to ensure that the system operates effectively and meets environmental regulations.