Free process tools
Activated Sludge / Process Calculators
Process calculators covering the core daily decisions in activated-sludge treatment. Metric and US units, with the formula behind every result.
8 calculators · metric and US units · free
Solids Management
SRT
Sludge Retention Time (SRT). Solve for SRT, WAS flow or MLSS.
Open the SRT calculatorWAS Rate
Daily wasting flow needed to hold a target SRT at steady state, with weekly totals.
Open the WAS Rate calculatorMLSS
Adjust wasting rates to bring MLSS to a target value over a set number of days.
Open the MLSS calculator
Loading & Settling
Recycle & Planning
RAS
Return Activated Sludge flow, recycle ratio and resulting MLSS.
Open the RAS calculatorWeekly WAS
Convert between daily flow and weekly totals and calculate solids removed.
Open the Weekly WAS calculatorWAS Scenario Comparison
Compare two wasting strategies side by side.
Open the WAS Scenario Comparison calculator
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