Answered: A lagoon with volume 15,000 m3 is being…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Question

A lagoon with volume 15,000 m3 is being polluted by a stream that flows at 1,000 m3/day and
carries fecal bacteria with a concentration of 5,000 per mL due to a leaking sewage pipe.
a) Assuming this has been going on for a while (steady state), that the lagoon is completely
mixed (CSTR), and that the bacteria die off with a first-order decay constant of 0.1 day-1,
what would bethe concentration of the water flowing out of the lagoon?
Answer: 2000 mL-1
b) If the leaking pipe is found and repaired, what would concentration be a day later? If safe
levels for swimming are 100 per mL, could one swim in the lagoon or outflow next day?
Answer: 1692 mL-1
c) On what day will the concentration drop below (i.e., reach) the safe-swimming standard
value of 100 per mL?
Answer: Day 18

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