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What is the unit of influent flow rate?

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in Bioprocess Engineering by (80.7k points)
What is the unit of influent flow rate?

(a) m d

(b) m/d

(c) m^2/d

(d) m^3/d

The question was posed to me during an online exam.

This interesting question is from Bioreactor Configurations topic in section Reactor Engineering of Bioprocess Engineering

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Right answer is (d) m^3/d

Easiest explanation: HRT also known as hydraulic residence time is a measure of the average length of time that a soluble compound remains in a constructed bioreactor. Hydraulic retention time is the volume of the aeration tank divided by the influent flow rate:

where HRT is hydraulic retention time (d) and usually expressed in hours (or sometimes days), the V is the volume of aeration tank or reactor volume (m^3), and is the influent flow rate (m^3/d).

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