1. What is the Treatability Constant Calculator?

Definition: This calculator determines the treatability constant at standard conditions (20°C and 20ft filter depth) based on values at different temperatures.

Purpose: It helps wastewater treatment professionals adjust process parameters for temperature variations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( K_{20/20} \) — Treatability constant at 20°C and 20ft depth
• \( K_{30/20} \) — Treatability constant at 30°C and 20ft depth
• \( θ \) — Temperature activity coefficient
• \( T \) — Wastewater temperature (°C)

Explanation: The formula adjusts the treatability constant from 30°C to 20°C while accounting for the actual wastewater temperature.

3. Importance of Treatability Constant Calculation

Details: Accurate treatability constants ensure proper design and operation of biological wastewater treatment systems.

4. Using the Calculator

Tips: Enter the treatability constant at 30°C, temperature coefficient (default 1.035), and current wastewater temperature in °C.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical temperature activity coefficient?
A: For biological wastewater treatment, θ is typically 1.035, but can range from 1.02 to 1.08 depending on the process.

Q2: Why use 20°C as the standard?
A: 20°C is a common reference temperature for wastewater treatment processes and allows for standardized comparisons.

Q3: How does temperature affect treatability?
A: Higher temperatures generally increase biological activity and treatment rates, while lower temperatures decrease them.

Q4: Where do I find the treatability constant at 30°C?
A: This is typically determined through pilot studies or provided in treatment system documentation.

Q5: Can this be used for other temperatures?
A: Yes, the formula works for any temperature adjustment, not just between 20°C and 30°C.