# Question 29.4: Awastewater stream is introduced to the top of a mass-transf...

A wastewater stream is introduced to the top of a mass-transfer tower where it flows countercurrent to an air stream. At one point in the tower, the wastewater stream contains $1 \times 10^{-3} \mathrm{~g} \mathrm{~mol} \mathrm{~A} / \mathrm{m}^{3}$ and the air is essentially free of any $A$. At the operating conditions within the tower, the film mass-transfer coefficients are $k_{L}=5 \times 10^{-4} \mathrm{~kg} / \mathrm{mol} / \mathrm{m}^{2} \cdot \mathrm{s} \cdot\left(\mathrm{kg} \mathrm{mol} / \mathrm{m}^{3}\right)$ and $k_{G}=0.01 \mathrm{~kg} \mathrm{~mol} / \mathrm{m}^{2} \cdot \mathrm{s} \cdot \mathrm{atm}$. The concentrations are in the Henry’s law region where $p_{A, \mathrm{i}}=H c_{A, \mathrm{i}}$ with $H=10 \mathrm{~atm} /\left(\mathrm{kg} \mathrm{mol} / \mathrm{m}^{3}\right)$. Determine

(a) the overall mass flux of $A$.

(b) the overall mass-transfer coefficients, $K_{L}$ and $K_{G}$.

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Question: 29.2

## The Henry’s law constant for oxygen dissolved in water is 4.06 × 10^9 Pa/(mol of O2 per total mol of solution) at 293 K. Determine the solution concentration of oxygen in water that is exposed to dry air at 1.013 × 10^5 Pa and 293 K. ...

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Question: 29.3

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