Answered: What is the steady-state concentration…

Engineering

Civil Engineering

What is the steady-state concentration of DO?

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter14: Ocean Thermal Energy Conversion And Ocean Salinity Gradient Energy

Section: Chapter Questions

Problem 6P

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Electric Current, Voltage and Electric Power

The term electric current is the flow of electrons or electric charges. The drift of electrons is proportional to the amount of voltage or potential difference applied. The more is the voltage, the more will be the electron drift. The amount of electric current a circuit possesses is proportional to the density of electrons or electric charge.

Question

Water with a dissolved oxygen (DO) concentration of 0.94 mg/L enters a well-mixed tank
at a rate of 1500 L/min. The tank volume is 280 m3. In the tank, bacteria consume the oxygen for metabolism proportionally to the amount of oxygen present (if they use it at a rate r = k1 · DO, where k1 = 0.0021 min−1). Oxygen is dissolving into the water at a rate proportional to the degree of undersaturation (i.e., at a rate given by r = k2(DOsat − DO), where k2 = 0.0021 min−1 and DOsat = 8.5 mg/L. What is the steady-state concentration of
DO?

Answer in units of mg/L.

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