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Bartleby Sitemap - Textbook Solutions

All Textbook Solutions for Solid Waste Engineering

1.1P 1.2P 1.3P 1.4P 1.5P 1.6P 1.7P We often see packaging labeled “made from 100% recycled materials “or Made with recyclable materials. The objective is, of course. ‘to make you (the consumer) believe that the company is environmentally conscious and caring and, thus, to make you buy more of its products. a. Why are such statements as the ones quoted above potentially misleading? What questions would you want to ask the company to determine if it truly is helping with materials recycling? b. All things considered, if the statements are true, why ought you buy the company products in prefer. ence to products with no recycled material Be specific. c. If you were working for the corn. pany, how would you write the statements to be more accurate?1.9P Consider the meaning and purpose of the various recycling symbols shown in Figure 1.15. a. Which are used solely as marketing tools, and which tell you what you want to know if your intent is to buy recycled materials? b. Find and cut out a recycling symbol from some product and attach it to your homework paper. Discuss its purpose and integrity.1.11P . What is the content of recycled fiber in the paper used by your school/college/ department? If recycled paper costs more than virgin fiber paper, should your school purchase it?1.13P 1.14P 1.15P 1.16P 1.17P 2.1P 2.2P 2.3P 2.4P 2.5P 2.6P 2.7P 2.8P 2.9P 2.10P 2.11P 2.12P 2.13P 2.14P 2.15P 2.16P 2.17P 2.18P 2.19P 2.20P 3.1P 3.2P 3.3P 3.4P 3.5P 3.6P 3.7P 3.8P 3.9P 3.10P 3.11P 3.12P 3.13P 3.14P 3.15P 3.16P 3.17P 3.18P 3.19P 3.20P 3.21P 3.22P 4.1P 4.2P 4.3P 4.4P 4.5P 4.6P 4.7P 4.8P 4.9P 4.10P 4.11P 4.12P 4.13P 4.14P 4.15P 4.16P 4.17P 4.18P 4.19P 4.20P 4.21P Why is it so difficult to process MSW?5.1P 5.2P 5.3P 5.4P 5.5P 5.6P 5.7P 5.8P 5.9P 5.10P 5.11P 5.12P 5.13P Two materials, A and B, are to be separated using two unit operations, 1 and 2. The feed has 10 tons/h A and 4 tons/h B. The split (fraction of material rejected by each operation) is given in Table P5-14. a. Which sequence of operations, (l?2) or (2?1), will yield the greatest recovery of material A? b. What will be the purity of material A using that sequence? c. What will be the efficiency of separation for the entire process train with regard to material A using the Worrell-Stesed equation?5.15P 5.16P 5.17P 5.18P 5.19P 5.20P 5.21P 5.22P 5.23P 5.24P 5.25P 5.26P 5.27P 5.28P Which would separate a mixture of steel and aluminum cans, a boance and adherence separator or a ferrous magnet? Explain why.5.30P 5.31P 5.32P According to Figure 5-20, is ii possible to completely separate one of the four materials from the other three? Explain your answer.using Figure 5-27, what is the advantage of the suspended type magnet over the other two types of magnets?6.1P 6.2P 6.3P 6.4P 6.5P 6.6P Suppose a wet mixture of old bread, leaves, and soil is placed in a pile 1 m tall, and a long thermometer is struck in the middle of the pile. Every other day. the pile is aerated by throwing the mixture into a new pile. Draw a graph showing the temperature in the pile during the first two weeks and explain why these temperature changes occurs.6.8P Estimate the production of CO2 and CH4 during the anaerobic decomposition of ethanol. C2H6O.6.10P 6.11P 7.1P The ideal equation for the combustion of cellulose is C6H10O5 + 6O26O2 + 5H2O. What is a similar idealized equation for pyrolysis? What end products might you expect?You serve as the president of XYZ corporation, which is an energy intensive manufacturing operation. You have four boilers to produce steam and electricity for your operations. One is a semi-suspension fired boiler with a capacity of 100 tons of coal per hour. The boiler can also burn supplemental fuel such as coconut or macadamia nut shells. The other three boilers arc peaking units and burn fuel oil. The City of Podunk has approached you about the possibility of burning solid waste as a supplemental fuel. As the president of the XYZ Corporation, you need to develop answers to many political, social, and technical questions before you make a commitment to the city. a. What specific questions would you ask your own power plant engineer about the possibility of accepting Podunk’s MSW? b. What specific additional data would you need from the city before you discuss this further?7.4P 7.5P 7.6P 7.7P 7.8P 7.9P Cellulose is to be burned in a waste-to- energy fadlity. The chemical equation for cellulose C6 H10O5is the atomic weights of C, H, and O are 12, 1, and 16. respectively. a. Calculate the stoichiometric oxygen necessary for the combustion of cellulose. b. Calculate stoichiometric air.7.11P 7.12P 7.13P 7.14P 7.15P 7.16P 7.17P 8.1P 8.2P 8.3P 8.4P 8.5P 8.6P 8.7P 8.8P 8.9P 8.10P 8.11P 8.12P 8.13P 8.14P 8.15P 8.16P 9.1P 9.2P 9.3P 9.4P 9.5P 9.6P 9.7P 9.8P 9.9P 9.10P 9.11P 9.12P 9.13P 9.14P

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