What is the thickness range of typical biomass found on an RBC?

The typical biomass thickness on a Rotating Biological Contactor (RBC) usually falls within the range of 0.05 to 0.1 inch. This range is optimal for maintaining a healthy microbial population that effectively breaks down organic materials in wastewater.

At this thickness, the biomass is thin enough to allow sufficient oxygen diffusion through to the microorganisms while still providing a substantial surface area for biofilm growth that is effective in treating wastewater. Thicker biomass layers can hinder oxygen transfer and potentially lead to anaerobic conditions, which are not desirable in an aerobic treatment process.

The other options either exceed or do not meet the generally accepted range for biomass thickness in RBCs, making them less appropriate for effective treatment purposes.