Deoxygenation Constant Formula:
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Definition: This calculator computes the deoxygenation constant (KD) based on the rate constant in BOD (K).
Purpose: It helps environmental engineers and wastewater treatment professionals determine the rate of oxygen depletion in water bodies.
The calculator uses the formula:
Where:
Explanation: The rate constant in BOD is divided by 2.3 to account for the logarithmic base conversion in the BOD decay equation.
Details: The deoxygenation constant is crucial for modeling oxygen depletion in water bodies and designing wastewater treatment systems.
Tips: Enter the rate constant in BOD (1/sec). The value must be > 0.
Q1: What is the typical range for rate constant in BOD?
A: For domestic sewage at 20°C, K typically ranges from 0.1 to 0.23 day-1 (1.16×10-6 to 2.66×10-6 sec-1).
Q2: Why divide by 2.3?
A: The factor 2.3 comes from the conversion between natural logarithm (base e) and base 10 logarithm (ln 10 ≈ 2.3).
Q3: How does temperature affect the deoxygenation constant?
A: The constant increases with temperature, typically following the Arrhenius relationship with θ ≈ 1.047.
Q4: What units should I use?
A: The calculator uses 1/sec units. If you have day-1 values, divide by 86400 to convert to 1/sec.
Q5: How is this used in wastewater treatment?
A: It helps determine the oxygen demand in biological treatment processes and receiving water bodies.