Sewage Discharge Given Oxygen Required In Aeration Tank Calculator

Formula Used:

\[ Q_{oxy} = \frac{f \times (O_2 + (1.42 \times Q_w \times X_R))}{Q_i - Q} \]

Ratio of BOD to Ultimate BOD (f):

Theoretical Oxygen Requirement (O₂):

kg/s

Volume of Wasted Sludge per day (Q_w):

m³/s

MLSS in Returned or Wasted Sludge (X_R):

kg/m³

Influent BOD (Q_i):

kg/m³

Effluent BOD (Q):

kg/m³

Sewage Discharge (Q_oxy):

m³/s

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1. What is Sewage Discharge Given Oxygen Required?

Sewage Discharge Given Oxygen Required is the amount of sewage that needs to be treated in an aeration tank based on the oxygen demand of the microorganisms. This calculation is essential for designing and operating wastewater treatment plants efficiently.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q_{oxy} = \frac{f \times (O_2 + (1.42 \times Q_w \times X_R))}{Q_i - Q} \]

Where:

\( f \) — Ratio of BOD to Ultimate BOD
\( O_2 \) — Theoretical Oxygen Requirement (kg/s)
\( Q_w \) — Volume of Wasted Sludge per day (m³/s)
\( X_R \) — MLSS in Returned or Wasted Sludge (kg/m³)
\( Q_i \) — Influent BOD (kg/m³)
\( Q \) — Effluent BOD (kg/m³)

Explanation: This formula calculates the sewage discharge required in an aeration tank based on oxygen requirements and BOD levels.

3. Importance of Sewage Discharge Calculation

Details: Accurate calculation of sewage discharge is crucial for proper aeration tank design, ensuring sufficient oxygen supply for microbial activity, and maintaining efficient wastewater treatment processes.

4. Using the Calculator

Tips: Enter all required values with appropriate units. Ensure that Influent BOD is greater than Effluent BOD for valid calculation. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of the ratio f?
A: The ratio f represents the relationship between 5-day BOD and ultimate BOD, which is important for understanding the biodegradability of organic matter.

Q2: Why is theoretical oxygen requirement important?
A: Theoretical oxygen requirement indicates the amount of oxygen needed to completely oxidize organic compounds, which is essential for proper aeration system design.

Q3: What does MLSS represent in this calculation?
A: MLSS (Mixed Liquor Suspended Solids) represents the concentration of microorganisms in the returned or wasted sludge, which affects the oxygen demand.

Q4: How does this calculation help in wastewater treatment?
A: This calculation helps determine the appropriate sewage discharge rate to maintain optimal oxygen levels for microbial activity in the aeration tank.

Q5: What are typical units for these parameters?
A: Oxygen requirement is typically in kg/s, sludge volume in m³/s, BOD concentrations in kg/m³, and the final sewage discharge in m³/s.