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1. All of the following are used to move refuse EXCEPT:
| rubber-belted conveyors. | ||
| live-bottom hoppers. | ||
| screw conveyors. | ||
| leachate. |
2. All of the following are forms of size reduction in solid waste management EXCEPT:
| shearing. | ||
| shredding. | ||
| grinding. | ||
| picking. |
3. Two major considerations in the design of MSW storage facilities are:
| public health and rain. | ||
| fire and public health. | ||
| chemical fires and trespassing of the outside public. | ||
| power requirements of shredders and fires. |
4. __________ is a process of separation by size.
| Rejecting | ||
| Screening | ||
| Coding | ||
| Cascading |
5. Compute the rotor speed of a shredder. The shredder’s motor inertia is 75,000 lb-ft2, starting time is 30 seconds, and power is 80 kW.
| 9.9 rpm | ||
| 13.3 rpm | ||
| 228 rpm | ||
| 264 rpm |
6. __________ respond to the problem of separating nonferrous metals from the remainder of refuse and depend on the ability of metals to conduct electrical currents.
| Eddy current separators | ||
| Magnets | ||
| Shredders | ||
| Air classifiers |
7. All of the following are forms of modified classifiers EXCEPT:
| constricted. | ||
| pulsed flow. | ||
| zig-zag. | ||
| electrostatic precipitators. |
8. Two methods that are presently used to reduce the damage when explosions occur in refuse shredders are:
| dynamite and gunpowder. | ||
| gasoline and gunpowder. | ||
| venting and flame suppression. | ||
| dynamite and venting. |
9. The operation of the cyclone causes particles that have a greater mass to move __________ towards the high-velocity rotating wall.
| outward | ||
| inward | ||
| across | ||
| slowly |
10. One of the first size reduction devices used for solid waste processing was the __________.
| slow-speed shredder | ||
| refuse-derived fueling system | ||
| hammermill | ||
| electric motor |
11. Explain how magnets are used as electromechanical separators. Describe their usage in detail, and explain some potential problems with their usage. What are some advantages?
Your response should be at least 200 words in length.
12. Describe some difficulties in processing MSW. Identify and explain some of the methods that are used to process MSW. Provide detailed examples. In terms of the processing, which application do you feel is more beneficial than others?
Your response should be at least 200 words in length.
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