Concept explainers
The composition of waste when some percentage of waste was recycled and to determine the change in energy content.
Answer to Problem 2.18P
The following table shows the composition of waste when some percentage of waste was recycled.
Component | Energy(Btu/lb) | Initial weight(lb) | Final weight(lb) |
Food | 2000 | 10 | 9 |
Paper | 7200 | 33 | 16.5 |
Cardboard | 7000 | 8 | 8 |
Plastics | 14000 | 5 | 3.75 |
Textile | 7500 | 3 | 3 |
Rubber | 10000 | 4 | 4 |
Yard Waste | 2800 | 18 | 18 |
Metal | 300 | 10 | 7 |
Miscellaneous | 3000 | 9 | 9 |
Thus, the change in energy content is
Explanation of Solution
Calculation:
The following table shows the change in the composition of waste.
Component | Energy |
Initial weight |
Change in weight |
Final weight |
Food | 2000 | 10 | |
9 |
Paper | 7200 | 33 | |
16.5 |
Cardboard | 7000 | 8 | - | 8 |
Plastics | 14000 | 5 | |
3.75 |
Textile | 7500 | 3 | - | 3 |
Rubber | 10000 | 4 | - | 4 |
Yard Waste | 2800 | 18 | - | 18 |
Metals | 300 | 10 | |
7 |
Miscellaneous | 3000 | 9 | - | 9 |
Calculate the change in energy content.
Here, change in energy content is
Substitute the values from the table.
Conclusion:
The following table shows the composition of waste when some percentage of waste was recycled.
Component | Energy(Btu/lb) | Initial weight(lb) | Final weight(lb) |
Food | 2000 | 10 | 9 |
Paper | 7200 | 33 | 16.5 |
Cardboard | 7000 | 8 | 8 |
Plastics | 14000 | 5 | 3.75 |
Textile | 7500 | 3 | 3 |
Rubber | 10000 | 4 | 4 |
Yard Waste | 2800 | 18 | 18 |
Metal | 300 | 10 | 7 |
Miscellaneous | 3000 | 9 | 9 |
Thus, the change in energy content is
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