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Wastewater Load Calculator.

Calculate influent and effluent loads and removal percentage from measured flow and concentrations.

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Set your values

Results update as you type.

02 / ANSWER

Flow

Influent concentration

Effluent concentration

Results update automatically as you type.

How to Use

All model coefficients, prices, and units are entered explicitly. This is a planning calculation, not veterinary or agronomic advice.

Use Cases

Monitor treatment plant efficiency

Use the calculator to assess how well your wastewater treatment process removes pollutants by comparing influent and effluent loads.

Example: Input flow of 1000 m³/day, influent BOD of 200 mg/L, effluent BOD of 20 mg/L to see 90% removal.

Estimate pollutant loading for permits

Calculate the mass load of a specific pollutant to ensure compliance with discharge permits or to design treatment systems.

Example: Determine daily load of nitrogen from a flow of 500 m³/day and concentration of 30 mg/L.

Frequently Asked Questions

How is the wastewater load calculated?: The load is calculated by multiplying the flow rate by the concentration. For influent load, use the influent concentration; for effluent load, use the effluent concentration. The result is typically expressed in mass per time (e.g., kg/day).
What does the measured removal percentage represent?: The removal percentage indicates the efficiency of the treatment process in reducing the pollutant load. It is calculated as ((Influent Load - Effluent Load) / Influent Load) * 100. A higher percentage means better treatment performance.
Can I use any units for flow and concentration?: Yes, the calculator accepts any consistent units for flow (e.g., m³/day, L/s) and concentration (e.g., mg/L, kg/m³). Ensure that the units are compatible so that the load calculation is correct.

Tips & Common Mistakes

Tips

Ensure flow and concentration units are consistent (e.g., m³/day and mg/L) to get load in appropriate mass/time units.
Use average flow and concentration values over a representative period for more accurate load estimates.
Double-check your concentration values: influent should be higher than effluent for a positive removal percentage.
For multiple pollutants, calculate each separately using the same flow but respective concentrations.

Common Mistakes to Avoid

Mixing units without conversion, e.g., using flow in L/s and concentration in mg/L, leading to incorrect load units.
Entering effluent concentration higher than influent, which results in a negative removal percentage; check your data.
Forgetting to convert concentration from mg/L to kg/m³ when using flow in m³/day, causing load to be off by a factor of 1000.

Last updated: August 13, 2026

Use Cases

Monitor treatment plant efficiency

Use the calculator to assess how well your wastewater treatment process removes pollutants by comparing influent and effluent loads.

Example: Input flow of 1000 m³/day, influent BOD of 200 mg/L, effluent BOD of 20 mg/L to see 90% removal.

Estimate pollutant loading for permits

Calculate the mass load of a specific pollutant to ensure compliance with discharge permits or to design treatment systems.

Example: Determine daily load of nitrogen from a flow of 500 m³/day and concentration of 30 mg/L.

Frequently Asked Questions

How is the wastewater load calculated?

The load is calculated by multiplying the flow rate by the concentration. For influent load, use the influent concentration; for effluent load, use the effluent concentration. The result is typically expressed in mass per time (e.g., kg/day).

What does the measured removal percentage represent?

The removal percentage indicates the efficiency of the treatment process in reducing the pollutant load. It is calculated as ((Influent Load - Effluent Load) / Influent Load) * 100. A higher percentage means better treatment performance.

Can I use any units for flow and concentration?

Yes, the calculator accepts any consistent units for flow (e.g., m³/day, L/s) and concentration (e.g., mg/L, kg/m³). Ensure that the units are compatible so that the load calculation is correct.

Tips & Common Mistakes

Tips

Ensure flow and concentration units are consistent (e.g., m³/day and mg/L) to get load in appropriate mass/time units.
Use average flow and concentration values over a representative period for more accurate load estimates.
Double-check your concentration values: influent should be higher than effluent for a positive removal percentage.
For multiple pollutants, calculate each separately using the same flow but respective concentrations.

Common Mistakes to Avoid

Mixing units without conversion, e.g., using flow in L/s and concentration in mg/L, leading to incorrect load units.
Entering effluent concentration higher than influent, which results in a negative removal percentage; check your data.
Forgetting to convert concentration from mg/L to kg/m³ when using flow in m³/day, causing load to be off by a factor of 1000.

Use Cases

Monitor treatment plant efficiency

Use the calculator to assess how well your wastewater treatment process removes pollutants by comparing influent and effluent loads.

Example: Input flow of 1000 m³/day, influent BOD of 200 mg/L, effluent BOD of 20 mg/L to see 90% removal.

Estimate pollutant loading for permits

Calculate the mass load of a specific pollutant to ensure compliance with discharge permits or to design treatment systems.

Example: Determine daily load of nitrogen from a flow of 500 m³/day and concentration of 30 mg/L.

Frequently Asked Questions

How is the wastewater load calculated?

What does the measured removal percentage represent?

Can I use any units for flow and concentration?

Yes, the calculator accepts any consistent units for flow (e.g., m³/day, L/s) and concentration (e.g., mg/L, kg/m³). Ensure that the units are compatible so that the load calculation is correct.

Tips & Common Mistakes

Tips

Ensure flow and concentration units are consistent (e.g., m³/day and mg/L) to get load in appropriate mass/time units.
Use average flow and concentration values over a representative period for more accurate load estimates.
Double-check your concentration values: influent should be higher than effluent for a positive removal percentage.
For multiple pollutants, calculate each separately using the same flow but respective concentrations.

Common Mistakes to Avoid

Mixing units without conversion, e.g., using flow in L/s and concentration in mg/L, leading to incorrect load units.
Entering effluent concentration higher than influent, which results in a negative removal percentage; check your data.
Forgetting to convert concentration from mg/L to kg/m³ when using flow in m³/day, causing load to be off by a factor of 1000.