MLVSS Calculator
Calculate Mixed Liquor Volatile Suspended Solids for wastewater treatment analysis
Calculate MLVSS
Calculate MLVSS using flow rates, COD values, and F/M ratio
Volume of mixed liquor entering the aeration tank per hour
Food to microorganism ratio (typically 0.3-0.6)
COD of mixed liquor entering the aeration tank
COD after primary treatment in aeration tank
Aeration Tank Dimensions
Freeboard is the distance between the wastewater level and tank top
MLVSS Results
Formula used: MLVSS (mass) = COD added to aeration ÷ F/M ratio
Concentration: MLVSS (conc.) = MLVSS (mass) ÷ (Volume × 8.34 × 10⁻⁶)
Flow conversion: 0 GPH = 0.0000 MGD
MLVSS Analysis
Understanding MLVSS in Wastewater Treatment
What is MLVSS?
MLVSS (Mixed Liquor Volatile Suspended Solids) represents the concentration of active bacteria in an activated sludge wastewater treatment system. These microorganisms are responsible for breaking down organic matter in sewage.
Key Components
- •Mixed Liquor: Combination of raw wastewater and activated sludge
- •Volatile: Components destroyed at 550°C (mainly bacteria)
- •Suspended Solids: Particles larger than 2 microns
Calculation Methods
Industrial Method
Uses flow rates, COD values, and F/M ratio for plant-scale calculations
Laboratory Method
Direct measurement using sample weights and volumes
Typical MLVSS Ranges
Industrial Calculation Formula
Flow (MGD) = Flow (GPH) × 24 ÷ 1,000,000
Primary Effluent COD = Influent COD - Treated COD
COD Added = Flow (MGD) × Effluent COD × 8.34
MLVSS (mass) = COD Added ÷ F/M Ratio
MLVSS (conc.) = Mass ÷ (Volume × 8.34 × 10⁻⁶)
Laboratory Calculation Formula
MLSS = (Sample + Filter - Filter) ÷ Volume
Fixed Solids = (Ash + Crucible - Crucible) ÷ Volume
MLVSS = MLSS - Fixed Solids
Note: Laboratory method requires careful sample handling and precise measurements for accurate results.