Deoxygenation Constant Formula:
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Definition: This calculator determines the deoxygenation rate constant (KD) at any temperature based on its value at 20°C.
Purpose: It helps environmental engineers and scientists adjust BOD rate constants for different water temperatures.
The calculator uses the formula:
Where:
Explanation: The formula accounts for how biological activity (and thus oxygen demand) increases with temperature.
Details: Accurate KD values are crucial for modeling dissolved oxygen levels in water bodies and wastewater treatment systems.
Tips: Enter the deoxygenation constant at 20°C (typically 0.1-0.4 1/day for domestic wastewater) and the current water temperature.
Q1: Why is temperature important for deoxygenation?
A: Biological activity (and thus oxygen consumption) increases with temperature, typically by about 4.7% per °C.
Q2: What's a typical KD(20) value?
A: For domestic wastewater, KD(20) is typically 0.1-0.4 1/day. For river water, it's often lower (0.05-0.2 1/day).
Q3: Can this formula be used for other rate constants?
A: Yes, the same temperature correction (1.047) is often used for other biological rate constants like nitrification.
Q4: How accurate is the temperature correction?
A: The 4.7% per °C is an average value - actual temperature dependence may vary slightly depending on conditions.
Q5: What temperature range is this valid for?
A: Typically valid for 4-30°C, though most accurate in the 10-25°C range.