Sludge Age Calculator
Calculate Solids Retention Time (SRT) for activated sludge processes
Aeration Tank Parameters
Sludge Wasting
Effluent Quality
Sludge Age (SRT)
1.8 days
High Rate Process
Solids Balance
Total Solids in Tank17500 kg
WAS Solids9600.0 kg/day
Effluent Solids Loss3.60 kg/day
Total Removed9603.6 kg/day
Process Parameters
Specific Growth Rate0.549 /day
Estimated F/M0.324 kg BOD/kg MLSS/day
WAS for 10-day SRT9.1 m3/hr
SRT Guidelines
High Rate1-3 days
Conventional3-6 days
Extended Aeration6-15 days
Nitrification15-30 days
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.