7-2. Estimate the maximum amount (by weight) of material that could be separated for recycling from residential MSW using a two-container system. What should be the size of the two containers? Use the waste composition given in Table 3-4, and assume that there are 3.1 residents per residence.
7-2. Estimate the maximum amount (by weight) of material that could be separated for recycling from residential MSW using a two-container system. What should be the size of the two containers? Use the waste composition given in Table 3-4, and assume that there are 3.1 residents per residence.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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7-2. Estimate the maximum amount (by weight) of material that could be separated for recycling from residential MSW using a two-container system. What should be the size of the two containers? Use the waste composition given in Table 3-4, and assume that there are 3.1 residents per residence.
Transcribed Image Text:TABLE 3-4
Typical physical composition of residential MSW excluding recycled
materials and food wastes discharged with wastewater (1990)
Percent by weight
Component
Organic
Food wastes
Paper
Cardboard
Plastics
Textiles
Rubber
Leather
Yard wastes
Wood
Misc. organics
Inorganic
Glass
Tin cans
Aluminum
Other metal
Dirt, ash, etc.
Total
United Statesª
Range Typical'
6-18
25-40
3-10
4-10
0-4
0-2
0-2
5-20
1-4
4-12
2-8
0-1
1-4
0-6
9.0
34.0
6.0
7.0
2.0
0.5
0.5
18.5
2.0
8.0
000
6.0
0.5
3.0
3.0
100.0
Packaging materials
50-60
12-16
4-8
20-30
6-8
2-4
Davis, Californiad
6.0
33.1
7.9
10.7
2.4
2.5
0.1
17.7
5.0
0.4
5.8
3.9
0.4
3.6
0.5
100.0
Adapted in part from Refs. 2, 3, 9, and 14-16. Reported percentage distributions are exclusive of special and
hazardous wastes.
Twenty percent of the households in the United States are assumed to have food waste grinders. Additionally,
it is assumed that the percentage of food waste ground up and discharged with wastewater is 25 percent.
Current (1990) recycling rate for the United States assumed to be 11 percent.
Adapted in part from Ref. 10.
Based on measurements made over a five-year period (1985 to 1990) during the first two weeks of October
(see Table 3-9).
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