1. What is Deoxygenation Constant at given Temperature?

Definition: This calculator determines the deoxygenation rate constant (K_D) 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.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( K_D(T) \) — Deoxygenation constant at temperature T (1/day)
• \( K_D(20) \) — Deoxygenation constant at 20°C (1/day)
• \( T \) — Water temperature (°C)
• 1.047 — Temperature correction coefficient

Explanation: The formula accounts for how biological activity (and thus oxygen demand) increases with temperature.

3. Importance of Temperature Adjustment

Details: Accurate K_D values are crucial for modeling dissolved oxygen levels in water bodies and wastewater treatment systems.

4. Using the Calculator

Tips: Enter the deoxygenation constant at 20°C (typically 0.1-0.4 1/day for domestic wastewater) and the current water temperature.

5. Frequently Asked Questions (FAQ)

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 K_D(20) value?
A: For domestic wastewater, K_D(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.