Oxygen Required In Aeration Tank Given Oxygen Demand Of Biomass Calculator

Formula Used:

\[ O_a = \frac{Q_s \times (Q_i - Q)}{f} - (D_{O2} \times Q_w \times X_R) \]

Sewage Discharge (Q_s):

m³/s

Influent BOD (Q_i):

kg/m³

Effluent BOD (Q):

kg/m³

Ratio of BOD to Ultimate BOD (f):

Oxygen Demand of Biomass (D_O2):

Volume of Wasted Sludge per day (Q_w):

m³/s

MLSS in Returned or Wasted Sludge (X_R):

kg/m³

Oxygen Required in Aeration Tank (O_a):

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1. What is Oxygen Required in Aeration Tank?

Oxygen Required in Aeration Tank is the amount of oxygen needed to sustain the aerobic microbial activity that breaks down organic matter in the wastewater. It is a critical parameter in designing and operating wastewater treatment systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ O_a = \frac{Q_s \times (Q_i - Q)}{f} - (D_{O2} \times Q_w \times X_R) \]

Where:

\( O_a \) — Oxygen Required in Aeration Tank (mg/day)
\( Q_s \) — Sewage Discharge (m³/s)
\( Q_i \) — Influent BOD (kg/m³)
\( Q \) — Effluent BOD (kg/m³)
\( f \) — Ratio of BOD to Ultimate BOD
\( D_{O2} \) — Oxygen Demand of Biomass
\( Q_w \) — Volume of Wasted Sludge per day (m³/s)
\( X_R \) — MLSS in Returned or Wasted Sludge (kg/m³)

Explanation: The formula calculates the net oxygen requirement by subtracting the oxygen demand from biomass from the oxygen needed for BOD removal.

3. Importance of Oxygen Calculation

Details: Accurate oxygen calculation is crucial for maintaining proper aerobic conditions in wastewater treatment, ensuring efficient organic matter decomposition, and preventing system failure due to oxygen deficiency.

4. Using the Calculator

Tips: Enter all values in appropriate units. Sewage discharge and volume of wasted sludge should be in m³/s, BOD values in kg/m³, and MLSS in kg/m³. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: Why is oxygen required in aeration tanks?
A: Oxygen is required to support aerobic microorganisms that break down organic pollutants in wastewater through biological oxidation processes.

Q2: What factors affect oxygen requirement?
A: Factors include wastewater flow rate, organic loading, temperature, microbial population, and system design parameters.

Q3: How is oxygen typically supplied?
A: Oxygen is usually supplied through mechanical aerators, diffused aeration systems, or surface aerators that transfer oxygen from air to water.

Q4: What happens if oxygen is insufficient?
A: Insufficient oxygen leads to anaerobic conditions, poor treatment efficiency, odor problems, and potential system failure.

Q5: Can this calculation be used for system design?
A: Yes, this calculation is fundamental for designing aeration systems and determining appropriate aerator sizes and capacities.