Q: Assume a rough estimate of MSW composition is as follows: % by weightMoisture content (%)Paper (assume dry mass all cellulose, C6H10O5)408%Glass10-Steel10-Aluminum10-Food waste (assume dry mass all sugar, C6H12O6)3080% a) If 20,000 metric tonnes of this waste is for anaerobic digestion, how much methane gas would theoretically be produced?b) If 20,000 metric tonnes of this waste is for aerobic composting. How much oxygen would theoretically be demanded?

Question
Asked Oct 29, 2019

Q: Assume a rough estimate of MSW composition is as follows:

 

% by weight

Moisture content (%)

Paper (assume dry mass all cellulose, C6H10O5)

40

8%

Glass

10

-

Steel

10

-

Aluminum

10

-

Food waste (assume dry mass all sugar, C6H12O6)

30

80%

 

a) If 20,000 metric tonnes of this waste is for anaerobic digestion, how much methane gas would theoretically be produced?

b) If 20,000 metric tonnes of this waste is for aerobic composting. How much oxygen would theoretically be demanded?

 

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Expert Answer

Step 1

MSW stands for Municipal solid waste. It contains organic waste, food waste, on biodegradable waste. Anaerobic decomposition of this waste results in huge methane gas emission. It is the major pollutant responsible ozone layer depletion and greenhouse effect.

Given Information:

Glass(SiO,)
Раper(C,HО,)
Steel (FeC)
Aluminium (Al,O3)
Food waste (C H06
Total carbon,hydrogen and oxygen content = C13H22014
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Glass(SiO,) Раper(C,HО,) Steel (FeC) Aluminium (Al,O3) Food waste (C H06 Total carbon,hydrogen and oxygen content = C13H22014

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Step 2

Using the formula:

4a+b-2c
Cн,
4а-Ь+2с
4а -b-2с
С, Но, +
4
со,
НО-
8
8
where a 13, b
22, c = 14
Plugging in the coefficients,
4(13)-(22)+2(14)
4(13)+22-2(14)
Н.о
4(13)-22-2(14)
|сн,
со,
4
8
8
CH, 0.5 HO-5.75 CH +7.25 Co
9g
92g
mass: 402g
319g
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4a+b-2c Cн, 4а-Ь+2с 4а -b-2с С, Но, + 4 со, НО- 8 8 where a 13, b 22, c = 14 Plugging in the coefficients, 4(13)-(22)+2(14) 4(13)+22-2(14) Н.о 4(13)-22-2(14) |сн, со, 4 8 8 CH, 0.5 HO-5.75 CH +7.25 Co 9g 92g mass: 402g 319g

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Step 3

Mass of methane produced p...

mass of methane
mass of metane per tonne
x1000
total mass of composition
92
-x1000 228.85 kg/tonne
402
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mass of methane mass of metane per tonne x1000 total mass of composition 92 -x1000 228.85 kg/tonne 402

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