Effluent BOD Given Volume Of Aeration Tank Calculator

Formula Used:

\[ Effluent\ BOD = Influent\ BOD - \left( \frac{Volume\ of\ Tank \times MLSS \times (1 + Endogenous\ Respiration\ Rate\ Constant \times Sludge\ Age)}{Maximum\ Yield\ Coefficient \times Sewage\ Discharge \times Sludge\ Age} \right) \]

Influent BOD:

kg/m³

Volume of Tank:

m³

MLSS:

kg/m³

Endogenous Respiration Rate Constant:

1/s

Sludge Age:

Maximum Yield Coefficient:

Sewage Discharge:

m³/s

Effluent BOD:

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1. What is Effluent BOD?

Effluent BOD (Biochemical Oxygen Demand) is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a water sample at a certain temperature over a specific time period. It's a key indicator of water quality and treatment efficiency.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Effluent\ BOD = Influent\ BOD - \left( \frac{V \times X \times (1 + K_e \times \theta_c)}{Y \times Q_s \times \theta_c} \right) \]

Where:

\( Influent\ BOD \) — Total BOD present in incoming sewage (kg/m³)
\( V \) — Volume of aeration tank (m³)
\( X \) — MLSS concentration (kg/m³)
\( K_e \) — Endogenous respiration rate constant (1/s)
\( \theta_c \) — Sludge age (s)
\( Y \) — Maximum yield coefficient
\( Q_s \) — Sewage discharge rate (m³/s)

Explanation: This formula calculates the remaining BOD in the effluent after biological treatment in an activated sludge system.

3. Importance of Effluent BOD Calculation

Details: Calculating effluent BOD is crucial for assessing wastewater treatment plant performance, ensuring compliance with environmental regulations, and optimizing treatment processes for efficient organic matter removal.

4. Using the Calculator

Tips: Enter all required parameters with appropriate units. Ensure values are positive and within reasonable ranges for accurate calculations. The calculator provides effluent BOD in kg/m³.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for effluent BOD?
A: Well-treated effluent typically has BOD values below 20 mg/L (0.02 kg/m³), though specific discharge limits vary by jurisdiction.

Q2: How does sludge age affect effluent BOD?
A: Longer sludge ages generally result in lower effluent BOD as microorganisms have more time to break down organic matter.

Q3: What factors can cause high effluent BOD?
A: High influent loads, insufficient aeration, short sludge age, temperature changes, or toxic shocks can lead to elevated effluent BOD.

Q4: How often should effluent BOD be monitored?
A: Most treatment plants monitor effluent BOD daily or weekly, depending on plant size and regulatory requirements.

Q5: Can this calculator be used for industrial wastewater?
A: While the formula is generally applicable, industrial wastewater may require adjustments for specific contaminants and treatment conditions.