GATE CE 2022 Set 2 — Question 43
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Environmental Engineering → Municipal Solid Waste → Composting
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Question
In a city, the chemical formula of biodegradable fraction of municipal solid waste (MSW) is . The waste has to be treated by forced-aeration composting process for which air requirement has to be estimated.Assume oxygen in air (by weight) = 23 %, and density of air = 1.3 kg/m.
Atomic mass: C = 12, H = 1, O = 16, N = 14.C and H are oxidized completely whereas N is converted only into during oxidation.For oxidative degradation of 1 tonne of the waste, the required theoretical volume of air (in m/tonne) will be (round off to the nearest integer)
Atomic mass: C = 12, H = 1, O = 16, N = 14.C and H are oxidized completely whereas N is converted only into during oxidation.For oxidative degradation of 1 tonne of the waste, the required theoretical volume of air (in m/tonne) will be (round off to the nearest integer)
Correct answer
(A) 4749
Solution
1.Chemical Reaction:
The oxidation reaction for is:2.Balancing the elements:
- Hydrogen (H):
- Oxygen (O):
- Molar mass of MSW () = g/mol.
- Mass of required per mole of MSW = g.
- Mass of required = kg.
- Mass of air required (since air is 23% by weight) = kg.
- Volume of air = m.
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