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An oil storage area, abandoned 19 years ago, had spilled oil on the ground that saturated the soil at a concentration of ~ 400 mg/kg soil. A fast-food chain wants to build a restaurant there and sampled the soil for contaminants only to discover that the soil still contains oil residues at a concentration of 20 mg/kg. A consulting environmental engineer (hired by the fast-food chain) concludes that the oil present must have been degraded by the soil microorganisms present in the soil at the site at a rate of 20 mg/kg each year. Therefore, according to this environmental engineer, in one more year the site will be free of all oil contamination. a. Was this a good assumption? Why or why not? (Hint: consider kinetics) b. How long do you think it will take to reach the acceptable contamination level of 1 mg/kg? (Note – Be sure to document the sources that you use and any assumptions that you make).

An oil storage area, abandoned 19 years ago, had spilled oil on the ground that saturated the soil at a concentration of ~ 400 mg/kg soil. A fast-food chain wants to build a restaurant there and sampled the soil for contaminants only to discover that the soil still contains oil residues at a concentration of 20 mg/kg. A consulting environmental engineer (hired by the fast-food chain) concludes that the oil present must have been degraded by the soil microorganisms present in the soil at the site at a rate of 20 mg/kg each year. Therefore, according to this environmental engineer, in one more year the site will be free of all oil contamination. a. Was this a good assumption? Why or why not? (Hint: consider kinetics) b. How long do you think it will take to reach the acceptable contamination level of 1 mg/kg? (Note – Be sure to document the sources that you use and any assumptions that you make).

Introduction to Chemical Engineering Thermodynamics
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
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An oil storage area, abandoned 19 years ago, had spilled oil on the ground that saturated the soil at a concentration of ~ 400 mg/kg soil. A fast-food chain wants to build a restaurant there and sampled the soil for contaminants only to discover that the soil still contains oil residues at a concentration of 20 mg/kg. A consulting environmental engineer (hired by the fast-food chain) concludes that the oil present must have been degraded by the soil microorganisms present in the soil at the site at a rate of 20 mg/kg each year. Therefore, according to this environmental engineer, in one more year the site will be free of all oil contamination. а. Was this a good assumption? Why or why not? (Hint: consider kinetics) b. How long do you think it will take to reach the acceptable contamination level of 1 mg/kg? (Note – Be sure to document the sources that you use and any assumptions that you make).
Transcribed Image Text:An oil storage area, abandoned 19 years ago, had spilled oil on the ground that saturated the soil at a concentration of ~ 400 mg/kg soil. A fast-food chain wants to build a restaurant there and sampled the soil for contaminants only to discover that the soil still contains oil residues at a concentration of 20 mg/kg. A consulting environmental engineer (hired by the fast-food chain) concludes that the oil present must have been degraded by the soil microorganisms present in the soil at the site at a rate of 20 mg/kg each year. Therefore, according to this environmental engineer, in one more year the site will be free of all oil contamination. а. Was this a good assumption? Why or why not? (Hint: consider kinetics) b. How long do you think it will take to reach the acceptable contamination level of 1 mg/kg? (Note – Be sure to document the sources that you use and any assumptions that you make).
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