Enter your Mixed Liquor Volume, MLSS, Settled Solids, Settle Time, Flow Rate, and Tank Volume into the MLVSS Calculator to find MLVSS Concentration, SVI, Volatile Fraction, and MLVSS/MLSS Ratio.
MLVSS Concentration
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Sludge Volume Index (SVI)
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Volatile Fraction
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MLVSS/MLSS Ratio
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MLVSS (Mixed Liquor Volatile Suspended Solids) represents the organic portion of suspended solids in an aeration tank. It's crucial for monitoring the biological activity and health of the activated sludge process in wastewater treatment systems.
MLVSS is typically calculated by measuring the volatile fraction of MLSS through laboratory analysis involving ignition at 550°C. The volatile portion that burns off represents the organic biomass content.
MLSS (Mixed Liquor Suspended Solids) includes all suspended solids, while MLVSS specifically measures only the volatile (organic) portion. MLVSS is typically 70-80% of MLSS in healthy activated sludge systems.
Typical MLVSS concentrations range from 1,500 to 4,000 mg/L, depending on the treatment process design, loading conditions, and desired effluent quality. Higher concentrations may indicate better treatment efficiency.
Sludge Volume Index (SVI) measures sludge settleability and is calculated using settled volume and MLSS. It helps assess sludge quality and settling characteristics in conjunction with MLVSS data.
MLVSS levels are influenced by organic loading rate, sludge retention time (SRT), temperature, pH, dissolved oxygen levels, and the food-to-microorganism (F/M) ratio in the system.
MLVSS should be monitored daily in most treatment plants to ensure optimal process control. More frequent monitoring may be needed during process upsets or when adjusting operational parameters.