What can be a significant indicator of biological treatment success in wastewater management?

A significant indicator of biological treatment success in wastewater management is low levels of solids in effluent. During the biological treatment process, microorganisms break down organic matter in the wastewater. A successful treatment results in the removal of these solids, which translates to cleaner effluent being discharged into the environment. This reduced presence of solids indicates effective microbial activity and that the treatment process, which aims to lower pollution levels, is functioning properly.

Other options suggest different scenarios that do not align with effective biological treatment. High nitrate levels in treated water can indicate incomplete treatment or problems in the nitrogen removal process, while consistent algae growth may imply nutrient imbalance or excess nutrients in the system. Maximized fat presence in tanks suggests incomplete breakdown of fats, oils, and greases, which would be counterproductive to the goals of wastewater treatment.