7. A contaminated soil is to be excavated and treated in a completely mixed aerated lagoon at a Superfund site. To determine the time that will take to treat the contaminated soil, a lab completely mixed batch reactor is used to gather the following data. Assuming a first-order reaction, estimate the rate constant, k and determine the time (t) to achieve 99% reduction in the original concentration. Time (day) Day 1 Day 16 Note that the 1st order batch system follows, C = Coet Waster Concentration (mg/L) 280 132

7. A contaminated soil is to be excavated and treated in a completely mixed aerated lagoon at a Superfund site. To determine the time that will take to treat the contaminated soil, a lab completely mixed batch reactor is used to gather the following data. Assuming a first-order reaction, estimate the rate constant, k and determine the time (t) to achieve 99% reduction in the original concentration. Time (day) Day 1 Day 16 Note that the 1st order batch system follows, C = Coet Waster Concentration (mg/L) 280 132

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Mechanical Processes

In civil engineering, the materials have to undergo a series of manufacturing processes before using them in construction and structural applications. These manufacturing processes form the foundation stone of mechanical processes. Some of the civil engineering materials such as bars, metallic beams, metallic columns, surveying equipment, earthmovers, overhead cranes, structural and construction components, and even cement that is the most fundamental construction component need to undergo different manufacturing processes before they are ready to use. These processes are mechanical.

Question

7. A contaminated soil is to be excavated and treated in a completely mixed aerated lagoon at a
Superfund site. To determine the time that will take to treat the contaminated soil, a lab
completely mixed batch reactor is used to gather the following data. Assuming a first-order
reaction, estimate the rate constant, k and determine the time (t) to achieve 99% reduction in
the original concentration.
Time (day)
Day 1
Day 16
Note that the 1st order batch system follows, C = Coekt
Waster Concentration (mg/L)
280
132

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Step 1: Introduction of the problem and express the waster concentration on day 1 and day 16 in the equation

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Step 2: Determine the rate constant and time (t) to achieve 99% reduction in the original concentration.

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