GATE CE 2019 Set 2 — Question 51
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Environmental Engineering → Municipal Solid Waste → Energy Recovery
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Question
Raw municipal solid waste (MSW) collected from a city contains decomposable material that can be converted to methane. The water content of the decomposable material is . An elemental analysis of the decomposable material yields the following mass percent.C : H : O : N : other = 44 : 6 : 43 : 0.8 : 6.2The methane production of the decomposable material is governed by the following stoichiometric relationGiven atomic weights: C = 12, H = 1, O = 16, N = 14. The mass of methane produced (in grams, round off to 1 decimal place) per kg of raw MSW will be _______
Correct answer
135 to 140
Solution
1.Mass of decomposable material in 1 kg of raw MSW:
2.Dry mass of decomposable material:
Water content is , so dry mass fraction is .3.Calculate moles of each element () in 455 g of dry material:
- Carbon ():
- Hydrogen ():
- Oxygen ():
- Nitrogen ():
From the general stoichiometry for anaerobic digestion:
5.Mass of methane produced:
Rounding to one decimal place, the mass is .Continue learning with Success Tracker
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