What is the cause of Low MLSS at aeration tank?

Low Mixed Liquor Suspended Solids (MLSS) in an aeration tank can be caused by several factors, including insufficient biomass growth due to inadequate food supply (BOD), poor aeration leading to reduced microbial activity, or excessive washout of solids caused by high hydraulic loading or short retention times. Additionally, operational issues such as improper mixing or ineffective settling in the clarifier can contribute to low MLSS levels. Regular monitoring and adjustments to the treatment process can help mitigate these issues.