Free Tools

Wastewater Treatment Calculators

Estimate treatment costs, calculate tank sizing, determine energy consumption, and more. All calculators are free to use — no registration required.

Treatment Cost Tank Sizing Energy Use Sludge Volume

Estimate annual operating costs based on flow rate and treatment level.

Flow Rate (m³/day)

Treatment Level

Energy Cost ($/kWh)

Calculate required volume based on hydraulic retention time.

Flow Rate (m³/day)

Hydraulic Retention Time (hrs)

Tank Depth (m)

Estimate power consumption and annual energy costs.

Equipment Type

Capacity (m³/day)

Energy Cost ($/kWh)

Estimate daily sludge production based on BOD loading.

Influent BOD (mg/L)

Flow Rate (m³/day)

Treatment Process

Calculate Food-to-Microorganism ratio for process optimization.

Influent BOD (mg/L)

Flow Rate (m³/day)

MLSS (mg/L)

Aeration Volume (m³)

Typical Design Parameters

Parameter	Typical Range	Unit	Notes
Primary Clarifier HRT	1.5 - 2.5	hours	Higher for low solids
Aeration Tank HRT	4 - 8	hours	Varies with BOD loading
MLSS Concentration	2,000 - 4,000	mg/L	Conventional AS
F/M Ratio	0.2 - 0.4	kg BOD/kg MLSS·day	Typical range
Sludge Age	3 - 15	days	Longer = better nitrification
Energy (AS)	0.3 - 0.6	kWh/m³	Total plant average
Energy (MBR)	0.6 - 1.0	kWh/m³	Higher membrane energy

Our engineers can provide detailed process design and cost estimates for your project.