Mixed Liquor Volatile Suspended Solids (MLVSS) in the activated sludge process represents:
Choose the correct answer
Total inorganic solids in the aeration tank
The active biomass (microorganisms) fraction of MLSS, used in kinetic design
The settled sludge volume
The final effluent suspended solids
Correct Answer
B. The active biomass (microorganisms) fraction of MLSS, used in kinetic design
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MLSS = MLVSS + inert ash. MLVSS (volatile = ignites at 550 deg C) represents active microbial biomass. Typical MLVSS/MLSS ratio = 0.7-0.8. In kinetics, process design uses MLVSS. Typical MLSS in conventional AS: 1500-3000 mg/L; extended aeration: 3000-6000 mg/L.
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