Oxygen Transfer Capacity Formula:
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Definition: Oxygen Transfer Capacity is the ability of a system, typically in a wastewater treatment context, to transfer oxygen from the air into the water.
Purpose: It helps engineers design and evaluate aeration systems for wastewater treatment plants and other water treatment applications.
The calculator uses the formula:
Where:
Explanation: The formula adjusts the measured oxygen transfer rate to standard conditions (20°C, zero dissolved oxygen) using temperature correction and the 0.85 correction factor.
Details: Proper oxygen transfer is crucial for biological wastewater treatment processes where microorganisms need oxygen to break down organic matter.
Tips: Enter the oxygen transferred rate, D.O saturation value (default 3.41455 kg/m³), operation dissolved oxygen level (default 0.00201 kg/m³), and temperature in °C (default 85°C).
Q1: What is the 0.85 correction factor?
A: It accounts for the fact that actual D.O. saturation in sewage is typically 85% of the theoretical saturation in clean water.
Q2: Why is temperature important in this calculation?
A: Oxygen solubility in water decreases as temperature increases, so we must correct for temperature differences.
Q3: What's a typical D.O saturation value?
A: For water at sea level and 20°C, it's about 9.17 mg/L (0.00917 kg/m³), but varies with temperature and pressure.
Q4: How do I measure oxygen transferred (N)?
A: This is typically measured during aeration system testing using off-gas analysis or other standard methods.
Q5: What units should I use for inputs?
A: Use consistent units - kg/m³ for concentrations, °C for temperature, and kg/s/W for oxygen transfer rates.