Civil Engineering MCQAE Level Civil Engineering
Mixed Liquor Volatile Suspended Solids (MLVSS) in the activated sludge process represents:
Environmental EngineeringMLVSS SignificanceMEDIUM
Choose the correct answer
A
Total inorganic solids in the aeration tank
B
The active biomass (microorganisms) fraction of MLSS, used in kinetic design
C
The settled sludge volume
D
The final effluent suspended solids
Correct Answer
B. The active biomass (microorganisms) fraction of MLSS, used in kinetic design
Why is this the answer?
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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