Elementary Principles of Chemical Processes, Binder Ready Version
Elementary Principles of Chemical Processes, Binder Ready Version
4th Edition
ISBN: 9781118431221
Author: Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher: WILEY
Question
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Chapter 10, Problem 10.13P
Interpretation Introduction

(a)

Interpretation:

Derive an expression for the mass generation rate of methane, M˙CH4(t) .Without doing any calculations, sketch the shape of a plot of M˙CH4(t) versus t from t=0 to t=3y and graphically show on the plot the total mass of methane generated in years 1,2 and 3. Then derive an expression for MCH4(t), the total mass of methane (tonnes) generated from t=0 to a time t.

Concept introduction:

m=Vρ

Interpretation Introduction

(b)

Interpretation:

A new landfill has a yield potential of L0=100SCMCH4/tonne waste and a rate constant k=0.04y1. At the beginning of the first year, 48,000tonnes of wastes are deposited in the landfill. Calculate the tonnes of methane generated from this deposit over a three year period.

Interpretation Introduction

(c)

Interpretation:

The methane produced in three years 4.8×104tonnes of waste was calculated using following equation where M˙CH4 is the first expression derived in part (a).

MCH4(t=3)=M˙CH4(t=0)×1y+M˙CH4(t=1)×2y+M˙CH4(t=2)×3y

Calculate the value determined with this method and the percentage error in the calculation. Show graphically what the calculated value corresponds to on another sketch of M˙CH4 vst.

Interpretation Introduction

(d)

Interpretation:

Following amount of waste are deposited in the landfill on January 1 in each of three consecutive years.

Waste (tonnes)
Year 1 48,000
Year 2 45,000
Year 3 54,000

Calculate the metric tons of CH4 generated through the end of the third year.

Interpretation Introduction

(e)

Interpretation:

Explain in your own words the benefits of reducing the release of methane from landfills and of using the methane as a fuel instead of natural gas.

Interpretation Introduction

(f)

Interpretation:

One way to avoid the environmental hazard of methane generation is to incinerate the waste before it has a chance to decompose. What problems might this alternative process introduce?

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