D.O Saturation for Sewage when Correction Factor is 0.85 Calculator

D.O Saturation Formula (Correction Factor 0.85):

\[ DO_{0.85} = \frac{N \times 9.17}{N_s \times 0.85 \times (1.024)^{(T-20)}}} + DL \]

Oxygen Transferred (N):

kg/s/W

Oxygen Transfer Capacity (N_s):

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 (Correction Factor 0.85)?

Definition: This calculator determines the dissolved oxygen saturation level in sewage when the correction factor is 0.85.

Purpose: It helps wastewater treatment professionals assess oxygen levels in sewage systems for proper biological treatment.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ DO_{0.85} = \frac{N \times 9.17}{N_s \times 0.85 \times (1.024)^{(T-20)}}} + DL \]

Where:

\( DO_{0.85} \) — Dissolved oxygen saturation (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 accounts for oxygen transfer rates, system capacity, temperature effects, and baseline dissolved oxygen.

3. Importance of D.O Saturation Calculation

Details: Proper oxygen levels are critical for aerobic biological treatment processes in wastewater systems.

4. Using the Calculator

Tips: Enter oxygen transfer values, temperature in °C, and operation dissolved oxygen. All values must be positive (except DL which can be zero).

5. Frequently Asked Questions (FAQ)

Q1: Why is the correction factor 0.85 used?
A: This accounts for the difference between clean water and sewage conditions in oxygen transfer efficiency.

Q2: What's the significance of temperature in the calculation?
A: Oxygen solubility decreases as temperature increases, so the formula includes a temperature correction.

Q3: What are typical values for oxygen transfer capacity?
A: This varies by system but typically ranges from 0.5-2.0 kg/s/W for wastewater treatment systems.

Q4: How do I measure operation dissolved oxygen?
A: Use a dissolved oxygen meter or probe in the wastewater system.

Q5: What's the 9.17 factor in the formula?
A: This is a conversion factor that accounts for standard conditions and units in the calculation.