Formula Used:
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Definition: Rate Constant in BOD refers to the rate laws that express the rate of a reaction as a function of the concentration of reactants in Biochemical Oxygen Demand calculations.
Purpose: It helps environmental engineers and scientists determine the rate of oxygen consumption by microorganisms in water.
The calculator uses the formula:
Where:
Explanation: The rate constant is calculated by multiplying the deoxygenation constant by 2.3 (the natural logarithm of 10).
Details: Accurate rate constant calculation is essential for modeling oxygen demand in water bodies, designing wastewater treatment systems, and assessing water quality.
Tips: Enter the deoxygenation constant in 1/sec. The value must be > 0.
Q1: What is the typical range for deoxygenation constant?
A: Typically ranges from 0.05 to 0.3 per day (5.787×10-7 to 3.472×10-6 1/sec) for domestic sewage at 20°C.
Q2: Why is the multiplier 2.3 used?
A: 2.3 is the conversion factor (ln 10) between base-e and base-10 logarithms used in BOD equations.
Q3: How does temperature affect these constants?
A: Both constants increase with temperature, typically following an Arrhenius-type relationship.
Q4: What's the difference between K and KD?
A: K is the rate constant for BOD reaction, while KD is the deoxygenation constant for the same reaction in base-10 form.
Q5: Where can I find KD values for different wastewaters?
A: Standard environmental engineering references or wastewater characterization studies provide typical values.