Mass of Wasted Activated Sludge Formula:
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Definition: This is the total mass of sludge that is removed from the wastewater treatment process, specifically from the activated sludge system.
Purpose: It helps wastewater treatment professionals determine how much sludge needs to be removed from the system to maintain optimal treatment conditions.
The calculator uses the formula:
Where:
Explanation: The formula calculates the difference between the mass of biomass produced and the mass of biomass lost through endogenous respiration.
Details: Proper sludge wasting is crucial for maintaining the right balance of microorganisms in the activated sludge process, ensuring efficient wastewater treatment.
Tips: Enter all required parameters with appropriate units. All values must be positive numbers.
Q1: What is the typical range for Maximum Yield Coefficient (Y)?
A: Typically ranges from 0.4 to 0.8 mg biomass/mg substrate for domestic wastewater.
Q2: How do I determine the Endogenous Respiration Rate Constant?
A: It's typically determined experimentally and ranges from 0.04 to 0.10 per day (≈4.63×10⁻⁷ to 1.16×10⁻⁶ per second).
Q3: What does a negative result mean?
A: A negative result suggests calculation error or unrealistic input values, as mass cannot be negative.
Q4: How often should sludge be wasted?
A: Typically daily, but depends on system design and loading conditions.
Q5: What affects Mixed Liquor Suspended Solids concentration?
A: Influent characteristics, aeration, sludge age, and temperature all affect MLSS.