Formula:
From: | To: |
Definition: The Average Daily Influent Flow Rate (Qa) is the total discharge that comes into the reactor in a wastewater treatment process.
Purpose: This calculation helps in designing and operating wastewater treatment plants by determining the flow rate based on Return Activated Sludge (RAS) and recirculation ratio.
The calculator uses the formula:
Where:
Explanation: The RAS flow rate is divided by the recirculation ratio to determine the average daily influent flow rate.
Details: Proper calculation of the influent flow rate is essential for maintaining the correct biomass concentration and treatment efficiency in activated sludge systems.
Tips: Enter the Return Activated Sludge flow rate in m³/s and the recirculation ratio (typically between 0.25 and 1.5 for most plants). All values must be > 0.
Q1: What is Return Activated Sludge (RAS)?
A: RAS is the portion of settled biomass that is recycled from the secondary clarifier back to the aeration tank.
Q2: What is a typical recirculation ratio?
A: Most plants operate with recirculation ratios between 0.25 and 1.5, depending on process requirements.
Q3: Why is this calculation important?
A: It helps maintain the proper food-to-microorganism ratio in the activated sludge process.
Q4: How do I measure RAS flow rate?
A: RAS flow is typically measured using flow meters installed in the return sludge piping.
Q5: What units should I use?
A: The calculator uses m³/s for flow rates, but you can convert from other units before entering values.