GATE CE 2023 Set 1 — Question 62
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Environmental Engineering → Municipal Solid Waste → Waste Characteristics
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Question
The composition and energy content of a representative solid waste sample are given in the table. If the moisture content of the waste is 26%, the energy content of the solid waste on dry-weight basis is ___________ MJ/kg (round off to one decimal place).
| Component | Percent by mass | Energy content as-discarded basis (MJ/kg) |
|---|---|---|
| Food waste | 20 | 4.5 |
| Paper | 45 | 16.0 |
| Cardboard | 5 | 14.0 |
| Plastics | 10 | 32.0 |
| Others | 20 | 8.0 |
Correct answer
18 to 19
Solution
1.Calculate the total energy content on an as-discarded basis ():
The total energy is the weighted sum of the energy contents of each component based on their mass percentages:2.Convert to dry-weight basis ():
The relationship between as-discarded energy and dry-basis energy is given by:Given moisture content = 26% = 0.26:
3.Rounding:
Rounding to one decimal place, we get .Continue learning with Success Tracker
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