1. What is a Deoxygenation Constant Calculator?

Definition: This calculator computes the deoxygenation constant (K_D) 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.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( K_D \) — Deoxygenation constant (1/sec)
• \( K \) — Rate constant in BOD (1/sec)

Explanation: The rate constant in BOD is divided by 2.3 to account for the logarithmic base conversion in the BOD decay equation.

3. Importance of Deoxygenation Constant

Details: The deoxygenation constant is crucial for modeling oxygen depletion in water bodies and designing wastewater treatment systems.

4. Using the Calculator

Tips: Enter the rate constant in BOD (1/sec). The value must be > 0.

5. Frequently Asked Questions (FAQ)

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.