What is an indication of over-wasting in an activated sludge system?

Low mixed liquor suspended solids (MLSS) concentrations in an activated sludge system can be a clear indication of over-wasting. Over-wasting refers to the condition where too much sludge is being removed from the system, which can hinder the ability of the bioreactor to maintain a sufficient concentration of microorganisms necessary for effective treatment.

An appropriate concentration of MLSS is crucial for efficient biological treatment because it provides a larger population of microorganisms to break down organic matter in the wastewater. When the MLSS levels drop too low, the microbial population is insufficient to treat the incoming wastewater effectively, potentially leading to lower treatment efficiency and diminished effluent quality.

Maintaining optimal MLSS levels is therefore essential in ensuring that the system operates at its intended efficiency.