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Solid Waste Engineering
3rd Edition
ISBN: 9781305635203
Author: Worrell, William A.
Publisher: Cengage Learning,
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Question
Chapter 6, Problem 6.8P
To determine
(a)
The amount of methane gas produced on complete decomposition.
To determine
(b)
The methane produced by natural process.
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Students have asked these similar questions
Q: Assume a rough estimate of MSW composition is as follows:
% by weight
Moisture content (%)
Paper (assume dry mass all cellulose, C6H10O5)
40
8%
Glass
10
-
Steel
10
-
Aluminum
10
-
Food waste (assume dry mass all sugar, C6H12O6)
30
80%
a) If 20,000 metric tonnes of this waste is for anaerobic digestion, how much methane gas would theoretically be produced?
b) If 20,000 metric tonnes of this waste is for aerobic composting. How much oxygen would theoretically be demanded?
Equal amounts of two types of waste are disposed into a section of a landfill. They both start
producing gas at t=0. Assume first-order decay for gas production. Each type of waste can
produce 150 L CH4/kg of waste. Waste type A produces gas with a half-life of 8 years, and
waste type B produces gas with a half-life of 4 years. How long (to the nearest year) until 90%
of the total gas has been produced?
a.
0.8 years
b. 6.4 years
c. 7 years
d. 27.6 years
e. 20.4 years
Check
Determine leachate generated in a cell in a 12-month period. You may assume that:
-Percolation through the cover is 15in
-Water consumed by waste decomposition is negligible (Life 1 contains mostly fresh waste)
-Water loss as water vapor in landfill gas is negligible (again due to fresh waste)
-Initial moisture content in fresh waste = 0.20
-Weight of waste in the lift = 3000 lb/yd²
-Weight of cover = 1500 lb/yd²
-The following sketch depicts water in and out of a waste lift.
Water
consumption by
waste
decomposition
PER or leachate
from above
Water stored in
waste
Leachate
generated
Water loss as water
vapor in landfill gas
Chapter 6 Solutions
Solid Waste Engineering
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