Sewage Concentration Calculator

Sewage Concentration Formula:

\[ C_s = \frac{C \times (Q_s + Q_{stream}) - (C_R \times Q_{stream})}{Q_s} \]

Mixing Concentration:

Sewage Discharge (m³/s):

m³/s

Discharge in Stream (m³/s):

m³/s

River Concentration:

Sewage Concentration:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is a Sewage Concentration Calculator?

Definition: This calculator determines the concentration of pollutants in sewage based on mixing concentrations, discharge rates, and river conditions.

Purpose: It helps environmental engineers and water quality professionals assess pollution levels and design appropriate treatment systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ C_s = \frac{C \times (Q_s + Q_{stream}) - (C_R \times Q_{stream})}{Q_s} \]

Where:

\( C_s \) — Sewage Concentration
\( C \) — Mixing Concentration
\( Q_s \) — Sewage Discharge (m³/s)
\( Q_{stream} \) — Discharge in Stream (m³/s)
\( C_R \) — River Concentration

Explanation: The formula calculates the original sewage concentration based on the mixed concentration observed downstream.

3. Importance of Sewage Concentration Calculation

Details: Accurate sewage concentration measurements are crucial for environmental compliance, treatment plant design, and pollution control.

4. Using the Calculator

Tips: Enter all required parameters - mixing concentration, sewage discharge, stream discharge, and river concentration. Sewage discharge must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What units should I use for the inputs?
A: Use consistent units - typically m³/s for discharge rates and matching concentration units (mg/L, ppm, etc.) for all concentration values.

Q2: What if the sewage discharge is zero?
A: The calculation is undefined when sewage discharge is zero, as you cannot determine sewage concentration without sewage flow.

Q3: How accurate is this calculation?
A: It provides a theoretical estimate assuming complete mixing. Real-world conditions may vary due to incomplete mixing or chemical reactions.

Q4: What parameters can this calculate?
A: It can calculate concentrations for BOD, DO, nutrients, or any other water quality parameter where the mixing equation applies.

Q5: How does stream discharge affect the result?
A: Higher stream discharge typically dilutes the sewage, requiring more precise measurements to determine original sewage concentration.