NPTEL Municipal Solid Waste Management Week 8 Assignment Answers 2024
1. Why is pretreatment done for a substrate in Anaerobic digestion process?
(a) Biomass integration
(b) Biomass disintegration
(c) Improved solubilization
(d) Decreased solubilization
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2. What is the percentage composition of hydrogen in biogas from the anaerobic digestion process?
(a) 0 – 1 vol.%
(b) 0 – 5 vol.%
(c) 0 – 3 vol.%
(d) 1 – 2 vol.%
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3. :…………. is the major pathway For the methanogens during anaerobic digestion process.
(a) CO2 + 4H2O CH4 + 2H2O
(b) nC6H12O6 3nCH3COOH
(c) 2CO2 + 4H2 CH3COOH + 2H2O
(d) CH3COOH CH4 + CO2
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4. What is the sequence of the anaerobic digestion process?
(a) Acetogenesis, Acidogenesis, Hydrolysis, Methanogenesis
(b) Hydrolysis, Acetogenesis, Acidogenesis, Methanogenesis
(c) Hydrolysis, Acidogenesis, Acetogenesis, Methanogenesis
(d) Fermentation, Acetogenesis, Acidogenesis, Methanogenesis
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5. The optimum range of pH during methanogenesis?
(a) 6 – 7
(b) 5.5 – 6
(c) 7 – 8.5
(d) 6.5 – 7.5
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6. What is converted to peptides in the hydrolysis process of anaerobic digestion?
(a) polysaccharides
(b) Protein
(c) Fats
(d) fatty acid
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7. High level of Simple sugars results in:
(a) VFA accumulation
(b) Increase pH
(c) Increase in methanogenesis
(d) None of the above
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8. What are the disadvantages of Deenbandhu biogas digestor?
(a) More leakage
(b) Decreased stability
(c) High recurring cost
(d) None of these
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9. Examples of community level waste management is/are
(a) Composting
(b) Incineration
(c) Biogas digesters
(d) Landfills
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10. Ultrasound frequencies ……………. than 20 kHz forms cavities producing shockwaves in a process is called…………
(a) less, solidification
(b) greater, cavitation
(c) greater, floatation
(d) none of these
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