MindTap Engineering, 1 term (6 months) Printed Access Card for Dunlap's Sustainable Energy, SI Edition, 2nd
2nd Edition
ISBN: 9781337551779
Author: DUNLAP, Richard A.
Publisher: Cengage Learning
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Chapter 4, Problem 6P
(a)
To determine
Determine the mass of
(b)
To determine
Analyze the burning of methane instead of decomposition has positive or negative environmental effects.
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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
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Estimate the total generation of Methane from 100 kg of organic waste by means of anaerobic digestion. Assume that organic waste is composed of 60 kg of C, 20 kg of O, 16 kg of N, and 4 kg of H.
Please write it so that I can recognize it.
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?
Chapter 4 Solutions
MindTap Engineering, 1 term (6 months) Printed Access Card for Dunlap's Sustainable Energy, SI Edition, 2nd
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- A county generates 1 million ton of municipal solid waste after recycling every year. The town is considering whether the waste is landfilled or incinerated. For disposal of the waste generated in one year, which option is better to produce less volume of greenhouse gases (GHGs)? Which option is better to have less greenhouse effect? We assume that the waste has a chemical formula of C68H111O50 Decomposition of solid waste in incineration is shown in the following reaction. CaHbOcNd+4a+b+2d-c2O2=aCO2↑+b2H2O+dNO↑ 2) water produced from the reaction(s) is not GHG because it is liquid water).arrow_forwardChoose the correct answer 200 g CO2 approximately takes up ____ L volume in air at 1 atm and 0oC? 4480; 100; C. 200; D. Undetermined Which of the following gases has the greatest contribution to the greenhouse effect on the Earth? A. Water vapor; B. CO2; C. CH4; D. O3 Based on what you have learned, which of the following can contribute(s) greenhouse gases? A. landfills; B. a deep lake with organic rich sediments; C. septic tanks; D. all of the above Which of the following gases is NOT a greenhouse gas? A. methane; B. carbon monoxide; C. hydrofluorocarbons; D. water vaporarrow_forwardThe local waste management agency has proposed to set up a waste combustion facility next to the existing landfill to maximize the life span of the landfill. Given the following information, determine how much the life span of the landfill is increased by the combustion. (a) Composition of MSW as given in column 1 of Table 3-4. (b) Estimated landfill capacity remaining = 300,000 yd3 (c) Capacity of combustion facility = 50 ton waste/h (d) Effective on-line combustion time per day = 22 h (e) Initial specific weight of waste = 287 lb/yd3 (f) Final specific weight of waste (MSW and ash) in landfill = 1200 lb/yd3arrow_forward
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