Oxygen Equivalent Given Critical Oxygen Deficit Calculator

Formula Used:

\[ Lt = \frac{Dc \times KR}{KD \times 10^{-KD \times tc}} \]

Critical Oxygen Deficit (Dc):

kg/m³

Reoxygenation Coefficient (KR):

1/s

Deoxygenation Constant (KD):

1/s

Critical Time (tc):

seconds

Oxygen Equivalent (Lt):

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1. What is Oxygen Equivalent?

The Oxygen Equivalent refers to the oxidizable organic matter present in sewage. It represents the amount of oxygen required to oxidize the organic matter in wastewater, which is a key parameter in water quality assessment and treatment processes.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Lt = \frac{Dc \times KR}{KD \times 10^{-KD \times tc}} \]

Where:

\( Lt \) — Oxygen Equivalent (kg/m³)
\( Dc \) — Critical Oxygen Deficit (kg/m³)
\( KR \) — Reoxygenation Coefficient (1/s)
\( KD \) — Deoxygenation Constant (1/s)
\( tc \) — Critical Time (seconds)

Explanation: This formula calculates the oxygen equivalent by considering the balance between oxygen depletion and reoxygenation processes in water bodies, particularly at the critical point where oxygen deficit is maximum.

3. Importance of Oxygen Equivalent Calculation

Details: Calculating oxygen equivalent is crucial for assessing the organic pollution load in wastewater, designing appropriate treatment systems, and predicting the impact of wastewater discharge on receiving water bodies' oxygen balance.

4. Using the Calculator

Tips: Enter all required parameters with appropriate units. Ensure values are positive and within reasonable ranges for accurate calculations. Critical oxygen deficit, reoxygenation coefficient, and deoxygenation constant should be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is Critical Oxygen Deficit?
A: Critical Oxygen Deficit refers to the condition where the deoxygenation rate exceeds the reoxygenation rate, representing the maximum oxygen deficit in a water body.

Q2: How is Reoxygenation Coefficient determined?
A: The Reoxygenation Coefficient is typically determined through field measurements or empirical relationships based on water temperature, flow velocity, and water body characteristics.

Q3: What factors affect the Deoxygenation Constant?
A: The Deoxygenation Constant is influenced by temperature, nature of organic matter, microbial activity, and other environmental conditions affecting oxygen consumption rates.

Q4: What does Critical Time represent?
A: Critical Time refers to the time at which minimum dissolved oxygen concentration occurs, found by differentiating the dissolved oxygen equation with respect to time.

Q5: Why is this calculation important in environmental engineering?
A: This calculation is essential for designing wastewater treatment plants, assessing environmental impact of discharges, and maintaining ecological balance in receiving water bodies.