Sewage Flow Given Food To Microorganism Ratio Calculator

Formula Used:

\[ Q = \frac{FM \times V \times X}{Qi} \]

Food to Microorganism Ratio (FM):

unitless

Volume of Tank (V):

m³

MLSS (X):

kg/m³

Influent BOD (Qi):

kg/m³

Sewage Flow (Q):

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1. What is Sewage Flow Given Food to Microorganism Ratio?

Sewage Flow Given Food to Microorganism Ratio is a calculation used in wastewater treatment to determine the flow rate of sewage into an aeration tank based on the food to microorganism ratio, tank volume, mixed liquor suspended solids (MLSS), and influent biochemical oxygen demand (BOD).

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = \frac{FM \times V \times X}{Qi} \]

Where:

\( Q \) — Sewage Flow (m³)
\( FM \) — Food to Microorganism Ratio (unitless)
\( V \) — Volume of Tank (m³)
\( X \) — MLSS (kg/m³)
\( Qi \) — Influent BOD (kg/m³)

Explanation: This formula calculates the sewage flow rate by considering the balance between the food supply (BOD) and the microorganisms available to treat it.

3. Importance of Sewage Flow Calculation

Details: Accurate sewage flow calculation is crucial for designing and operating wastewater treatment plants, ensuring proper treatment efficiency, and maintaining optimal conditions for biological treatment processes.

4. Using the Calculator

Tips: Enter all values in appropriate units. Food to Microorganism Ratio is unitless, Volume of Tank in cubic meters, MLSS in kg/m³, and Influent BOD in kg/m³. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for Food to Microorganism Ratio?
A: The typical range is 0.05-0.3 day⁻¹ for conventional activated sludge systems, but it varies depending on the treatment process and wastewater characteristics.

Q2: Why is MLSS important in this calculation?
A: MLSS represents the concentration of microorganisms in the aeration tank, which determines the treatment capacity of the system.

Q3: How does influent BOD affect sewage flow calculation?
A: Higher influent BOD requires either reduced flow rates or increased tank volume and MLSS to maintain the proper food to microorganism ratio.

Q4: What are the units for sewage flow?
A: Sewage flow is typically measured in cubic meters per day (m³/day) or liters per second (L/s) in wastewater treatment applications.

Q5: How often should this calculation be performed?
A: This calculation should be performed regularly as part of process control, especially when there are changes in wastewater characteristics or treatment requirements.