6. A lead recycling plant begins operation on the shores of a hitherto clean lake of volume 3.0 × 10 m. It discharges into the lake 12 m' per hour of waste containing 15 ppm of Pb". The water flows into this lake at a rate of 8400 m'/h and flows out of the lake at the same flow rate. a. What is the steady-state concentration of Pb* in the lake? Assume the lake is well mixed and that is has no other source or sink for Pb^. b. What is the residence time of Pb2* in the lake at the steady-state? e How long does it take for the Pb level to reach 99% of its steady-state value?
6. A lead recycling plant begins operation on the shores of a hitherto clean lake of volume 3.0 × 10 m. It discharges into the lake 12 m' per hour of waste containing 15 ppm of Pb". The water flows into this lake at a rate of 8400 m'/h and flows out of the lake at the same flow rate. a. What is the steady-state concentration of Pb* in the lake? Assume the lake is well mixed and that is has no other source or sink for Pb^. b. What is the residence time of Pb2* in the lake at the steady-state? e How long does it take for the Pb level to reach 99% of its steady-state value?
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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Transcribed Image Text:6. A lead recycling plant begins operation on the
shores of a hitherto clean lake of volume 3.0 x 10
m. It discharges into the lake 12 m' per hour of
waste containing 15 ppm of Pb“". The water flows
into this lake at a rate of 8400 m'/h and flows out of
the lake at the same flow rate.
a. What is the steady-state concentration of Pb* in
the lake? Assume the lake is well mixed and
that is has no other source or sink for Pb“".
b. What is the residence time of Pb²* in the lake at
the steady-state?
e How long does it take for the Pb level to reach
99% of its steady-state value?
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