Page 131 - Materials Chemistry, Second Edition

CAT3525_C04.qxd 1/27/2005 11:12 AM Page 102
102 Waste Management Practices: Municipal, Hazardous, and Industrial
23. Estimate the chemical composition of the organic fraction of the MSW sample described
below.
Component Wet weight (kg) Dry weight (kg)
Food waste 63.2 24.5
Yard waste 95.5 29.7
Paper products 174.0 152.2
Plastics 29.7 28.2

24. For the waste sample in Question 23, calculate the heat content (MJ/kg) using the mod-
ified Dulong formula.
25. Estimate the energy content from MSW, using the Khan equation, having the following
properties:
Component % by wt
Paper products 25
Corrugated cardboard 15
Plastics 6
Glass 8
Metals 12
Food waste 15
Ash, dirt, misc. 19
Total 100

26. For the following waste mixture,
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Component % by Wt Uncompacted Bulk Density (kg/m )
Paper products 39.5 61
Ferrous 10 44
Food waste 26 375
Yard waste 25 10.4

what is the bulk density for the waste mixture prior to compaction? Assume that the com-
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pacted density in the landfill cell is 575 kg/m . Estimate the volume reduction (expressed
as %) during compaction in the landfill.
27. Given data for the following waste sizes,
Sieve Size (mm)
Particle diameter (mm) 100 75 50 25
Weight of fraction (kg) 9 12 28 8
Number of particles 450 1200 2500 5250

calculate the arithmetic mean, the geometric mean and the weighted mean of particle size
distribution.
28. The higher heating value for cellulose, C H O , is 32,500 kJ/kg. Determine the lower
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10
heating value.