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Estimate the energy content of solid waste sample with the composition given in a table below. What is the content on dry basis and ash free dry basis?
Component % by mass Energy KJ/kg
Paper 45 4650
Cardboard 10 16750
Plastics 10 16300
Food wastes 15 32600
Garden wastes 10 6500
Wood 5 18600
Tin cans 5 700
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Assume 100 kg of sample.

Component % by mass Energy KJ/kg Total Energy (KJ)
(1) (2) (3) (4) (2*3)
Paper 45 4650 753750
Cardboard 10 16750 163000
Plastics 10 16300 326000
Food wastes 15 32600 69750
Garden wastes 10 6500 65000
Wood 5 18600 93000
Tin cans 5 700 3500 …

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