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Ultimate BOD is the total amount of oxygen consumed by microorganisms to decompose all the organic matter present in a water sample under aerobic conditions. It represents the complete oxidation of organic material.
The calculator uses the formula:
Where:
Explanation: This formula calculates the ultimate oxygen demand by dividing the 5-day BOD measurement by the ratio factor that represents the proportion of total oxygen demand achieved in 5 days.
Details: BOD measurement is crucial for assessing water quality, determining the level of organic pollution, and designing wastewater treatment systems. Ultimate BOD provides insight into the total organic loading in water bodies.
Tips: Enter the 5-day BOD value in kg/m³ and the ratio factor. Both values must be positive numbers. The ratio f typically ranges between 0.6-0.8 for most wastewater samples.
Q1: What is the difference between BOD5 and Ultimate BOD?
A: BOD5 measures oxygen consumption in 5 days, while Ultimate BOD represents the total oxygen required for complete decomposition of all organic matter.
Q2: What is a typical value for the ratio f?
A: The ratio f typically ranges from 0.6 to 0.8, meaning 60-80% of the ultimate BOD is achieved in 5 days under standard conditions.
Q3: Why is Ultimate BOD important in wastewater treatment?
A: Ultimate BOD helps engineers design treatment systems with adequate capacity to handle the total organic load and ensure proper treatment efficiency.
Q4: How is the ratio f determined?
A: The ratio f is typically determined through laboratory BOD tests conducted over an extended period (20-30 days) to establish the complete decomposition curve.
Q5: Can this formula be used for all types of wastewater?
A: While the formula is generally applicable, the ratio f may vary depending on the composition of organic matter and temperature conditions.