1. What is Organic Matter Oxidised Calculator?

Definition: This calculator estimates the amount of organic matter that has been oxidised in sewage treatment based on initial organic matter, deoxygenation constant, and time.

Purpose: It helps environmental engineers and wastewater treatment professionals determine the effectiveness of biological oxygen demand (BOD) reactions.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( l \) — Organic matter oxidised (kg/m³)
• \( L_s \) — Initial organic matter (kg/m³)
• \( K_D \) — Deoxygenation constant (1/day)
• \( t \) — Time in days

Explanation: The formula calculates the portion of organic matter that has been decomposed through oxidation over a given time period.

3. Importance of Organic Matter Oxidation Calculation

Details: Accurate calculation helps in designing wastewater treatment systems, assessing treatment efficiency, and ensuring compliance with environmental regulations.

4. Using the Calculator

Tips: Enter the initial organic matter concentration, deoxygenation constant (default 0.00000266 1/day), and time in days. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the deoxygenation constant?
A: It's a rate constant that describes how quickly oxygen is consumed during the decomposition of organic matter in water.

Q2: What's a typical value for K_D?
A: For domestic sewage, it's typically around 0.1 to 0.23 per day (base 10), which equals 0.00000266 to 0.00000612 1/second.

Q3: How do I determine initial organic matter?
A: This is typically measured through laboratory tests like BOD or COD (Chemical Oxygen Demand) tests.

Q4: Why is the formula base 10?
A: The base 10 formula is commonly used in environmental engineering for BOD calculations as it provides practical results.

Q5: How does temperature affect the calculation?
A: Temperature affects K_D - higher temperatures increase the deoxygenation rate. The calculator uses the K_D value at the actual temperature.