Concept explainers
(a)
The total density of the refuse.
Answer to Problem 8.3P
The total density is
Explanation of Solution
Given data:
The following table shows the mass of materials.
Component | Percent by weight |
Food waste | 10 |
Yard waste | 20 |
Mixed paper | 40 |
Corrugated cardboard | 100 |
Glass | 10 |
Ferrous(cans) | 10 |
Table (1)
Concept used:
Write the expression to calculate the total density.
Here, mass of material is
The following table shows bulk density of given materials.
Component | Bulk Densities |
Food waste | 23.04 |
Yard waste | 4.45 |
Mixed paper | 3.81 |
Corrugated cardboard | 1.87 |
Glass | 18.45 |
Ferrous (cans) | 6.36 |
Table (2)
Calculation:
Calculate the total density.
Substitute
Conclusion:
The total density is calculated by mass of materials and density and their components.
(b)
The bulk density of the refuse.
Answer to Problem 8.3P
The bulk density of refuse is
Explanation of Solution
Given data:
The following table shows the bulk density of the recovered refuse.
Component | Percentage recovered |
Garbage | 0 |
Yard waste | 0 |
Mixed paper | 50 |
Glass | 60 |
Ferrous(cans) | 95 |
Table (3)
Concept used:
Write the expression to calculate the not recovered mass of material.
Here, the not recovered mass of material is
Write the expression to calculate the total density of refuse.
Here, the density of the recovered refuse is
Calculation:
Calculate the density of the not recovered refuse.
Substitute
Here,
Calculate the density of the recovered refuse.
Substitute
Calculate the total density of the landfill.
Substitute
Conclusion:
The bulk density is calculated using the density of the recovered refuse, not recovered, recovered mass of material and not recovered mass of material.
(c)
Answer to Problem 8.3P
Explanation of Solution
Given data:
Original life of landfill is
Calculation:
Calculate the expected life of landfill.
Here, the expected life of the landfill is
Substitute
Conclusion:
Thus, the expected life for landfill is
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