Water & Environmental

Wastewater Treatment (WWTP) Calculators & Design Tools

Activated sludge SRT/MCRT, F/M ratio, clarifier SOR/SLR & SVI settleability.

WEF MOP 11 / Metcalf & Eddy Wastewater Engineering

Activated Sludge SRT (MCRT) & F/M Ratio

Solids Retention Time, F/M loading, and WAS waste sludge pump control

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Ten State Standards / WEF Clarifier Design Manual

Clarifier Surface Overflow Rate (SOR) & Solids Loading Rate (SLR)

Secondary clarifier hydraulic loading, weir overflow rate, and solids flux

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Standard Methods 2710 D / WEF Wastewater Laboratory Manual

Sludge Volume Index (SVI) & Settleability

Sludge Settleability, SV30 test evaluation, and maximum RAS concentration

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CPHEEO Manual on Sewerage & Sewage Treatment / Metcalf & Eddy Wastewater Engineering

SBR Sewage Treatment Plant (SBR STP Sizing)

Batch cycle dynamics, tank volumes, MLSS & F/M ratio, oxygen demand (AOR/SOR) & blower CFM requirements

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IS 2470 (Part 1 & 2) / US EPA Onsite Wastewater Treatment Systems Manual

Septic Tank & Soak Pit / Dispersion Sizing

Household & commercial sewage liquid volume, sludge accumulation storage, 2/3-chamber dimensions, and soak pit absorption area

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