The table below provides data on the composition of 1000 pounds of municipal was
ID: 3146743 • Letter: T
Question
The table below provides data on the composition of 1000 pounds of municipal waste and the reduction in weight resulting from incineration.
150
18.0
5.0
7.5
2,000
400
5.1
6.0
24.0
7,200
40
6.2
5.0
3.0
7,000
20
4.0
2.5
0.5
7,500
10
9.0
10.0
1.0
10,000
120
6.5
4.5
5.4
2,800
20
15.0
1.5
0.3
8,000
80
12.5
98.0
78.4
60
60
5.5
98.0
58.8
300
20
20.0
98.0
19.6
300
10
10.0
96.0
9.6
-----
70
30.0
70.0
28.0
3,000
Suppose that the noncombustible portion (last 5 items on the list) were separated from the combustible portion and the combustible portion burned. Find the answer to the following:
What is the percentage reduction in the weight of the combustible portion when it is burned?
What is the heat value (Btu/lb) of the unseparated waste described by the data in the table.
What is the heat value (Btu/lb) of the separated waste with the last five items on the list removed.
Does separation/recycling increase or decrease the heat value?
Component Solid Waste (lb) Density (lb/ft3) Residue (%) Residue (lb) Energy (Btu/lb) Food150
18.0
5.0
7.5
2,000
Paper400
5.1
6.0
24.0
7,200
Cardboard40
6.2
5.0
3.0
7,000
Textiles20
4.0
2.5
0.5
7,500
Rubber10
9.0
10.0
1.0
10,000
Yard Waste120
6.5
4.5
5.4
2,800
Wood20
15.0
1.5
0.3
8,000
Glass80
12.5
98.0
78.4
60
Steel Cans60
5.5
98.0
58.8
300
Ferrous Metal20
20.0
98.0
19.6
300
Non-Ferrous10
10.0
96.0
9.6
-----
Miscellaneous70
30.0
70.0
28.0
3,000
Explanation / Answer
The total weight of the combustile waste burned is 150 + 400 + 40 + 20 + 10 + 120 + 10 = 760
the wight of residue after burnt is 7.5 + 24.0 + 3.0 + 0.5 + 1.0 + 5.4 + 0.3 = 41.7
The percentage of weight reduction is ((760 - 41.7 ) / 760 )*100 = (718.3/760 ) * 100 = 94.51316 %
total heat from unseperated waste is
to obatain this we have to add all the terms in the last column in the table = 48160 Btu / lb
total heat from seperated waste with last five items removed is = 44500 Btu / lb
seperation /recycling increaase the heat value
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