D.O Saturation for Sewage when Correction Factor is 0.8 Calculator

D.O Saturation Formula (Correction Factor 0.8):

\[ DO_{0.8} = \frac{N \times 9.17}{N_s \times 0.8 \times (1.024)^{(T-20)}} + DL \]

Oxygen Transferred (N):

kg/s/W

Oxygen Transfer Capacity (Ns):

kg/s/W

Temperature (T):

°C

Operation Dissolved Oxygen (DL):

kg/m³

D.O Saturation (kg/m³):

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1. What is D.O Saturation for Sewage when Correction Factor is 0.8?

Definition: This calculator determines the dissolved oxygen saturation level in sewage when the correction factor is 0.8, based on oxygen transfer parameters and temperature.

Purpose: It helps wastewater treatment professionals assess the oxygen saturation levels in sewage systems, which is crucial for biological treatment processes.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ DO_{0.8} = \frac{N \times 9.17}{N_s \times 0.8 \times (1.024)^{(T-20)}} + DL \]

Where:

\( DO_{0.8} \) — D.O Saturation when Correction Factor is 0.8 (kg/m³)
\( N \) — Oxygen Transferred (kg/s/W)
\( N_s \) — Oxygen Transfer Capacity (kg/s/W)
\( T \) — Temperature (°C)
\( DL \) — Operation Dissolved Oxygen (kg/m³)

Explanation: The formula calculates the maximum dissolved oxygen concentration adjusted for the correction factor of 0.8, considering temperature effects and existing dissolved oxygen levels.

3. Importance of D.O Saturation Calculation

Details: Proper D.O saturation estimation ensures effective biological treatment of sewage, maintains aerobic conditions, and helps optimize aeration systems.

4. Using the Calculator

Tips: Enter the oxygen transfer parameters (N and Ns), temperature in °C, and current dissolved oxygen level (DL). All values must be positive (except DL which can be zero).

5. Frequently Asked Questions (FAQ)

Q1: Why is the correction factor 0.8 used?
A: The 0.8 correction factor accounts for typical field conditions in sewage treatment where oxygen transfer efficiency is about 80% of theoretical.

Q2: What does the 9.17 constant represent?
A: This is a conversion factor that accounts for standard conditions and units in the oxygen transfer equation.

Q3: How does temperature affect the calculation?
A: The (1.024)^(T-20) term adjusts for temperature effects on oxygen solubility and transfer rates.

Q4: What are typical values for N and Ns?
A: These vary by system but typically range from 0.0001 to 0.001 kg/s/W for wastewater treatment applications.

Q5: When would DL be zero?
A: DL would be zero when calculating saturation levels in completely deoxygenated water before aeration begins.