This set of Hazardous Waste Management Multiple Choice Questions & Answers (MCQs) focuses on “Thermal Processes – Energy Recovery”.
1. Energy can be recovered from all types of wastes.
Explanation: To enable energy recovery, the waste must have sufficient heating value to reach appropriate combustion temperatures without need for additional fuel.
2. Energy recovery is typically via production of __________
Explanation: Energy recovery is typically via production of steam which is driven through a turbine to produce electricity.
3. What is the maximum percent of energy recovered if the steam is condensed before reintroduced to system?
Explanation: The maximum percent of energy recovered if the steam is condensed before reintroduced to system is 35, because of condensing losses.
4. Energy recovery percentage depends on the type of waste.
Explanation: Energy recovery percentage will not depend on waste or method of combustion but on opportunities to sell low grade heat as well as energy.
5. Which of the following industrial process uses waste as a fuel?
a) Cement kilns
b) Lead manufacturing
c) Acid manufacturing
d) Sulphur manufacturing
Explanation: Heat and power plants, glass furnaces, steel manufacturing, lime and cement kilns uses wastes as a fuel or as a constituent part of the product.
6. What is the combustion temperature range in cement kiln incineration?
Explanation: The combustion temperature range in cement kiln incineration is 1350-1650 degree Celsius with long phase residence time up to 10 seconds.
7. Non-volatile heavy metals in kiln are fixed into __________
a) Clinker’s crystalline structure
c) Solid lump
Explanation: The alkaline environment in the kiln absorbs and neutralizes acid gases and metals, non-volatile heavy metals in kiln are fixed into clinker’s crystalline structure.
8. Which of the following waste types are not suitable for co-combustion in cement kilns?
Explanation: Highly contaminated wastes, wastes with high water, chlorine, heavy metals or sulphur content waste types are not suitable for co-combustion in cement kilns.
Sanfoundry Global Education & Learning Series – Hazardous Waste Management.
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- Chapterwise Practice Tests: Chapter 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
- Chapterwise Mock Tests: Chapter 1, 2, 3, 4, 5, 6, 7, 8, 9, 10