Home
Back
Formula Used:
| From: | To: |
Relative Stability at 37°C is a measure used in wastewater treatment to assess the ratio of oxygen available to the total oxygen required to satisfy first-stage BOD (Biochemical Oxygen Demand) demand. It indicates the stability of organic matter in wastewater samples.
The calculator uses the formula:
Where:
Explanation: The formula calculates the percentage stability based on the exponential decay of organic matter over time at 37°C.
Details: Relative stability measurement is crucial for assessing the treatment efficiency of wastewater plants, determining the degree of stabilization achieved, and ensuring compliance with environmental regulations.
Tips: Enter the time in days (must be a positive value). The calculator will compute the relative stability percentage based on the standard formula for 37°C conditions.
Q1: What does a higher relative stability percentage indicate?
A: A higher percentage indicates greater stability, meaning the organic matter in the wastewater is more stabilized and has lower oxygen demand.
Q2: Why is 37°C used as the standard temperature?
A: 37°C is used because it represents typical human body temperature and provides standardized conditions for comparing stability measurements.
Q3: What is the significance of the 0.63 constant?
A: The 0.63 constant represents the decay rate of organic matter at 37°C, derived from empirical studies of wastewater stabilization.
Q4: How is relative stability used in wastewater treatment?
A: It helps operators monitor treatment process efficiency, determine when wastewater is sufficiently stabilized for discharge, and optimize treatment operations.
Q5: What are typical relative stability values for treated wastewater?
A: Well-treated wastewater typically shows relative stability values above 90%, indicating good stabilization of organic matter.