1. What is BOD Calculation?

BOD (Biochemical Oxygen Demand) is a measure of the amount of oxygen that microorganisms will consume while decomposing organic matter under aerobic conditions. It's a key parameter in assessing water quality and pollution levels.

2. How Does the Calculator Work?

The calculator uses the BOD formula:

Where:

• \( BOD \) — Biochemical Oxygen Demand (kg/m³)
• \( DO \) — Dissolved Oxygen Consumed (kg/m³)

Explanation: This formula calculates the biochemical oxygen demand based on the measured dissolved oxygen consumption, using a standard dilution factor of 3/4.

3. Importance of BOD Measurement

Details: BOD measurement is crucial for assessing water quality, monitoring wastewater treatment efficiency, and determining the impact of organic pollution on aquatic ecosystems.

4. Using the Calculator

Tips: Enter the dissolved oxygen consumed value in kg/m³. The value must be greater than 0 for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What does BOD measure?
A: BOD measures the amount of oxygen consumed by microorganisms while decomposing organic matter in water under aerobic conditions.

Q2: Why is the 3/4 factor used?
A: The 3/4 factor is a standard dilution factor used to account for sample preparation in BOD testing procedures.

Q3: What are typical BOD values?
A: Clean water typically has BOD below 5 mg/L, while raw sewage can have BOD values of 100-400 mg/L. Highly polluted water can exceed 1000 mg/L.

Q4: How is BOD testing performed?
A: BOD testing involves measuring the dissolved oxygen concentration in a water sample before and after a 5-day incubation period at 20°C.

Q5: What factors affect BOD measurements?
A: Temperature, pH, presence of toxic substances, and microbial population can all affect BOD measurements and results.