Solid Waste Engineering
3rd Edition
ISBN: 9781305635203
Author: Worrell, William A.
Publisher: Cengage Learning,
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Question
Chapter 2, Problem 2.6P
To determine
The approximate composition of solid waste produced at the university.
Expert Solution & Answer
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Q4 Estimate the energy content of a solid waste sample with the composition
below and what is the content on a dry basis and on ash free dry basis?
Component
Percent by mass
Energy kJ/kg
Food waste
Paper
Cardboard
Plastics
Garden trimming
Wood
Tin cans
Total
15
45
10
10
10
5
5
100
Based on 100 kg sample of waste
Moisture content%
70
6
5
2
60
20
3
4,650
16,750
16,300
32,600
6,500
18,600
700
A truck dumped industrial waste into a pit. They found the truck 3 days ago with a pure pool of waste. Your lab finds the BOD5 of this waste to be 80 mg/L with a k=0.1/day. What was the waste source?
Here are the 3 nearby suspects:
Winery BOD ultimate = 275 mg/L
Vinegar manufacturer BOD ultimate = 80 mg/L
Pharmaceutical BOD ultimate = 200 mg/L
*: Determine the energy Value of typical municipal solid wastes with
the average composition shown in Table below
Solution
1.
Assume the heating value will be computed on an as-discarded
basis.
2.
Determine the energy value using a computation table
Computation of energy contents
Component
Solid Wastes
Energy
Total energy Btu
% lb.
Btu/lb
Food waste
15
2,000
Paper
40
7,200
Cardboard
7,000
Plastics
3
14.000
Textile
2
7,500
Rubber
0.5
10,000
Leather
0.5
7,500
Garden trimming
12
2,800
Wood
8,000
Glass
8
60
Tin cans
6.
300
Non ferrous
1
Ferrous
300
Dirt, Ash,and
4
3,000
brick
Ans: 4762Btu/lb
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