An aeration basin is used to oxygenate wastewater at 283 K. The basin is filled to a

Question:

An aeration basin is used to oxygenate wastewater at 283 K. The basin is filled to a depth of 4.55 m with 283 m3 wastewater of 0.050 mmole/L initial dissolved oxygen (O2) concentration. The filled basin is then aerated with six spargers, with each sparger delivering compressed air to bottom of the basin at a volumetric flow rate of 7.08 × 10-3 m3/s. The dissolved solids content will be low enough that Henry’s law will be obeyed, with a Henry’s law constant of H = 3.27 × 104 atm (pA = H · x*A) at 283 K. For purposes of this calculation, it may be assumed that the rate of O2 transferred to the liquid is small relative to molar flow rate of O2 in the aeration gas. 

a. Determine the dissolved oxygen concentration after a 5.0 min aeration time. 

b. Determine the time required to bring the dissolved oxygen concentration up to a concentration of 0.20 mmole/L (1 mmole/L = 1 gmole/m3). 

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For  book-img-for-question

Fundamentals Of Momentum Heat And Mass Transfer

ISBN: 9781118947463

6th Edition

Authors: James Welty, Gregory L. Rorrer, David G. Foster

Question Posted: