Treat the load, not the brochure.
Activated sludge, aeration demand, organic loading and pump-station sizing. Built for the wastewater engineers who keep it compliant.
Conventional activated sludge
F/M 0.30 · MLSS 3000 mg/L
These figures come from the Tenselo engine. Every result Tenselo produces shows the inputs it used and the method behind it, so the work can be checked rather than taken on trust.
Why it matters on the job
Basin sized to the load
Aeration volume, HRT and SRT worked from the BOD load and the process you've chosen.
Aeration that's enough
Oxygen demand and blower duty matched so the bugs keep working.
Clarifiers & pumps too
Sedimentation, RAS and pump-station sizing in the same pack.
10 Wastewater & Sewage calculators
Every calculator in this category, by its reference code. Running them needs a Tenselo subscription — subscriptions open soon.
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WWS-001 Gravity Sewer Grade & Self-Cleansing
Part-full Manning flow, velocity, depth & self-cleansing grade for gravity sewers (WSA 02)
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WWS-002 Pump-Station Emergency Storage
Power/pump-failure storage before overflow: required volume for a response time, or time-to-overflow for a given storage
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WWS-003 Rising Main Sizing & Scour Velocity
Pumped sewage main: velocity vs self-cleansing/scour, retention & friction (WSA 04)
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WWS-004 Wet-Well Pump Station Sizing
Active storage volume & well size, plus a single / duty+standby / duty+duty DAB FX pump pick (WSA 04 / Metcalf & Eddy)
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WWS-005 Activated Sludge Design
Aeration volume, F/M, SRT, RAS, sludge & oxygen demand
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WWS-006 Clarifier / Sedimentation Sizing
SOR area, diameter, weir & solids loading
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WWS-007 Population Equivalent & Load
EP, hydraulic & pollutant loads (BOD/COD/TSS/TKN/TP)
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WWS-008 Grease Arrestor Sizing
Commercial kitchen grease trap (AS/NZS 3500.2): 1-hour retention by peak flow or fixture units, to a standard size
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WWS-009 Septic Tank & Land Application
AS/NZS 1547 design flow, tank size & disposal area
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WWS-010 Trade-Waste pH Neutralisation Tank
Retention-tank volume and reagent direction to bring trade waste into the acceptance pH band
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