To be fair, the only system I have ever found this to work with was a SBR. Volatile Solids does not necessarily mean "good bugs", it means it will burn at 550 degrees C.
Mixed liquor suspended solids (MLSS) is the concentration of suspended solids, in an aeration tank during the activated sludge process, which occurs during the treatment of waste water.
@@shivamchaturvedi6955 it is a lump sum key design parameter for the microorganisms [mainly bacteria] biomass present in the aeration basin, also referred to as total suspended solids [indirect measure for biomass]