olumn 1 represents the fraction of the SW type in the total SW, Column 2 shows how many percent of the type of SW was recycled/recovered, Column 3 represents how many percent of the type of SW was combusted, and Column 4 shows the density of the type of SW. The volume of waste residue after combustion was negligible. 1) What is the total volume of SW that was landfilled? What is the average of density of the SW that was landfilled? 2) Usually, SW was compacted by some special equipment before landfilling. Also, because of the gravity from the other SW and cover material that was located above, the SW in a landfill was compressed, more or less. As a result, the volume of SW was decreased. Different sorts of SW exhibit different volume reduction behaviors. Column 5 is compact ratio, indicating the volume reduction. Compaction ratio = Volume before compaction/Volume after compaction. Please compute total volume and the average of density of the COMPACTED SW that was landfilled. 3) How many percent of the volume of the landfilled SW was reduced after compaction? 4) A “huge” landfill would store the compacted and landfilled SW produced in 2008. The landfill was regarded as a cuboid with a height of 10 ft. Please compute how large land (mile2) is required to bury the SW? If the landfill is located in the Essex County with a land area of 126 mile2, how many percent of the county land is occupied by the landfill? SW types Mass distribution Recovered (%) Combusted (assumed) (%) Density (kg/m3) Compact ratio (assumed) 1x 2 3 4 5 Paper/paperboard 31.0% 55.5% 15% 90 3 Glass 4.9% 23.1% 0.00 194 2 Ferrous metals 7.6% 31.4% 0.00 320 1.5 Non-ferrous metals 0.7% 68.8% 0.00 160 1.5 Plastics 12.0% 7.1% 15% 64 1.5 Rubber and leather 3.0% 14.3% 15% 150 4 Textiles 5.0% 15.3% 15% 64 5 Wood 6.6% 9.6% 15% 240 7 Food 12.7% 2.5% 15% 288 15 Yard trimming 13.2% 64.7% 15% 104 7 Others 3.3% 13.9% 0.00 150 5
Column 1 represents the fraction of the SW type in the total SW, Column 2 shows how many percent of the type of SW was recycled/recovered, Column 3 represents how many percent of the type of SW was combusted, and Column 4 shows the density of the type of SW. The volume of waste residue after combustion was negligible.
1) What is the total volume of SW that was landfilled? What is the average of density of the SW that was landfilled?
2) Usually, SW was compacted by some special equipment before landfilling. Also, because of the gravity from the other SW and cover material that was located above, the SW in a landfill was compressed, more or less. As a result, the volume of SW was decreased. Different sorts of SW exhibit different volume reduction behaviors. Column 5 is compact ratio, indicating the volume reduction. Compaction ratio = Volume before compaction/Volume after compaction. Please compute total volume and the average of density of the COMPACTED SW that was landfilled.
3) How many percent of the volume of the landfilled SW was reduced after compaction?
4) A “huge” landfill would store the compacted and landfilled SW produced in 2008. The landfill was regarded as a cuboid with a height of 10 ft. Please compute how large land (mile2) is required to bury the SW? If the landfill is located in the Essex County with a land area of 126 mile2, how many percent of the county land is occupied by the landfill?
|
SW types |
Mass distribution |
Recovered (%) |
Combusted (assumed) (%) |
Density (kg/m3) |
Compact ratio (assumed) |
|
1x |
2 |
3 |
4 |
5 |
|
|
Paper/paperboard |
31.0% |
55.5% |
15% |
90 |
3 |
|
Glass |
4.9% |
23.1% |
0.00 |
194 |
2 |
|
Ferrous metals |
7.6% |
31.4% |
0.00 |
320 |
1.5 |
|
Non-ferrous metals |
0.7% |
68.8% |
0.00 |
160 |
1.5 |
|
Plastics |
12.0% |
7.1% |
15% |
64 |
1.5 |
|
Rubber and leather |
3.0% |
14.3% |
15% |
150 |
4 |
|
Textiles |
5.0% |
15.3% |
15% |
64 |
5 |
|
Wood |
6.6% |
9.6% |
15% |
240 |
7 |
|
Food |
12.7% |
2.5% |
15% |
288 |
15 |
|
Yard trimming |
13.2% |
64.7% |
15% |
104 |
7 |
|
Others |
3.3% |
13.9% |
0.00 |
150 |
5 |
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