1. What is Oxygen Demand?

Oxygen Demand (OD) is a measure of the amount of oxygen required to oxidize organic and inorganic matter in water. It's an important parameter in water quality assessment and wastewater treatment.

2. How Does the Calculator Work?

The calculator uses the Oxygen Demand formula:

Where:

• \( Carbon \) — Carbon content in mg/L
• \( Hydrogen \) — Hydrogen content in mg/L
• \( Oxygen\ Adjustment \) — Oxygen adjustment factor in mg/L

Explanation: The equation calculates the net oxygen demand by considering the oxygen required to oxidize carbon and hydrogen content, minus any available oxygen.

3. Importance of Oxygen Demand Calculation

Details: Calculating oxygen demand helps in designing wastewater treatment systems, assessing water pollution levels, and determining the health of aquatic ecosystems.

4. Using the Calculator

Tips: Enter carbon content, hydrogen content, and oxygen adjustment values in mg/L. All values must be non-negative.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between OD and BOD?
A: OD measures total oxygen demand, while BOD (Biochemical Oxygen Demand) measures only the oxygen consumed by microorganisms during organic matter decomposition.

Q2: What are typical OD values for clean water?
A: Clean surface waters typically have OD values below 2 mg/L, while wastewater can have values from 100 to 1000 mg/L or more.

Q3: Why subtract oxygen adjustment?
A: The oxygen adjustment accounts for oxygen already present in the sample that can contribute to oxidation, reducing the net oxygen demand.

Q4: How does temperature affect OD?
A: Higher temperatures generally increase oxygen demand as chemical reactions proceed faster, though very high temperatures can reduce oxygen solubility.

Q5: Can this calculator be used for industrial wastewater?
A: Yes, but for complex industrial wastes, additional factors may need to be considered for accurate oxygen demand estimation.