Note:

This calculator determines the Dissolved Oxygen Deficit (D) using the Streeter-Phelps model.

It is essential in environmental engineering for analyzing oxygen depletion in water bodies due to organic pollution.

Explanation of Parameters:

• Reaeration Rate (k₂): The rate at which oxygen is reintroduced into the water, measured in 1/day.
• Deoxygenation Rate (k₁): The rate at which organic matter consumes oxygen, measured in 1/day.
• Initial BOD Ultimate (L₀): The maximum biochemical oxygen demand exerted by organic matter, measured in mg/L.
• Initial DO Deficit (D₀): The initial oxygen deficit in the water body, measured in mg/L.
• Time (t): The duration over which the oxygen deficit is calculated, given in days.

Why DO Deficit is Important?

Understanding DO deficit is crucial for wastewater treatment, water pollution control, and aquatic ecosystem health. It helps determine:

• The impact of organic pollution on dissolved oxygen levels.
• Whether a water body can naturally recover from pollution.
• The effectiveness of aeration and pollution control strategies.

Validations:

• Reaeration Rate (k₂): Must be a positive number.
• Deoxygenation Rate (k₁): Must be a positive number.
• Initial BOD Ultimate (L₀): Must be a positive number.
• Initial DO Deficit (D₀): Must be a non-negative number.
• Time (t): Must be a non-negative number.

Real-life Applications:

• Wastewater Treatment: Predicting oxygen depletion in effluents.
• Industrial Effluent Monitoring: Assessing the impact of industrial waste on water bodies.
• Environmental Impact Assessments: Studying oxygen depletion in rivers and lakes.
• Regulatory Compliance: Ensuring adherence to water quality standards.
• Fishery and Aquatic Life Protection: Preventing hypoxia and fish kills.

Conclusion:

The Streeter-Phelps model helps predict oxygen depletion, aiding in pollution control, water quality management, and ecosystem protection.