Reactor Volume Formula:
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Definition: This calculator determines the required volume of a biological reactor in wastewater treatment based on the wasting rate from the return line and other operational parameters.
Purpose: It helps wastewater treatment plant operators and engineers design and optimize activated sludge systems.
The calculator uses the formula:
Where:
Explanation: The formula calculates the reactor volume needed to maintain the desired sludge age while accounting for solids wasted through both the return line and effluent.
Details: Proper reactor sizing ensures effective biological treatment, meets effluent quality standards, and maintains stable operation of the activated sludge process.
Tips: Enter all required parameters with appropriate units. Mean Cell Residence Time and MLSS must be positive values. Other parameters can be zero if not applicable.
Q1: What is Mean Cell Residence Time (θc)?
A: Also called sludge age, it's the average time microorganisms spend in the system, typically 5-15 days for conventional activated sludge.
Q2: How do I determine MLSS concentration?
A: MLSS is measured through laboratory analysis of mixed liquor samples, typically ranging from 1500-4000 mg/L (1.5-4 kg/m³).
Q3: What if I don't have a return line wasting rate?
A: If wasting only occurs through the effluent, set Qw to zero and the calculation will use only effluent solids loss.
Q4: Why is reactor volume important?
A: Proper volume ensures sufficient contact time between microorganisms and wastewater for effective treatment.
Q5: How does this relate to F/M ratio?
A: Reactor volume affects Food-to-Microorganism ratio, a key parameter for process control in activated sludge systems.