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Mid-Term Examination

This document contains 23 questions about various topics related to waste management: 1. It asks to describe the characteristics of three groups of decomposers - aerobic, anaerobic, and facultative - according to their electron acceptors. 2. It asks to explain how soil sizes relate to soil permeability. 3. It provides information about the retention time and flow rate of wastewater in a tank and asks to calculate the required tank volume.

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Nita Vivi
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27 views2 pages

Mid-Term Examination

This document contains 23 questions about various topics related to waste management: 1. It asks to describe the characteristics of three groups of decomposers - aerobic, anaerobic, and facultative - according to their electron acceptors. 2. It asks to explain how soil sizes relate to soil permeability. 3. It provides information about the retention time and flow rate of wastewater in a tank and asks to calculate the required tank volume.

Uploaded by

Nita Vivi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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Mid-Term Examination of Waste Management

1. Decomposers are subdivided into three groups: aerobic, anaerobic, and facultative. Please describe
characteristics of three groups according to the electron acceptor.
2. Explain soil sizes are responsible to the soil characteristics regarding “Permeability” .
3. The retention time is designed as 4 hour. The flow rate of wastewater is 1.5 m3/min. Calculate the tank
volume (m3).
4. The pump power is set as Po = ho γQ, explain the meaning of ho.
5. Explain the “Return Period” . An event can be expected to recur once in 10 years. Calculate the probability
of the event.
6. Write the equation for total energy head in a hydraulic system, and explain each term
7. Explain the meaning of infiltration and depression in hydrologic cycle.
8. Clay is 60-cm deep and static head of water above clay is 40 cm. The permeability K is 1.0x10-7 cm/s.
Please compute the number of years required to penetrate the 60 cm moisture barrier.
9. List three types of partition coefficients in environment, and explain the meaning of coefficients.
10. A sample of a municipal solid waste landfill leachate is found to have a BOD5 of 800.00 mg/L. Estimate the
BODU after 20 days, assuming that k is 0.08 (1/day) for the sample
11. Plot the six functional elements of solid waste management and explain the correlation among them.
12. List the potential five gaseous pollutants in poorly operated incinerator.
13. Describe the component of industrial waste and explain the major source of the waste.
14. Describe management of hazardous waste in municipal solid waste.
15. List five factors cause the change in composition and characteristics of solid waste and explain the reasons.
16. The initial volume of a mass of solid waste is 20 yd3 . After compaction, the volume is 5 yd3. Compute the
percentage of volume reduction and the compaction ratio.
17. Solid waste with a dry specific weight of 200 lbs/yd3 can adsorb a significant amount of water, which fills
the voids by replacing air. If this waste has a moisture content of 20 percent, compute the wet specific
weight increase from equation.
18. Determine the quantity of leachate (Q) transmitted through a layer of solid waste (A=6.0 m2) with a
hydraulic conductivity (K) of 1.2X 10-5 m/s and slope of 1 percent (10%).
19. List processes for solid waste management need to examine particle size and the size distribution, and
explain the reason.
20. The MSW contains 40 % moisture and 10 % ash. The heat value is 5000 Btu/lb. When the value was
converted to a dry basis and ash-free basis, please calculate the heat value.
21. Which elements need to be analyzed for understanding chemical properties of solid wastes. Describe
potential effects of these elements on solid waste incineration,
22. Explain the meaning of stationary container system and hauled container system in waste transport.
23. Explain the meaning of Methods-time-measurement

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