NPTEL Wastewater Treatment and Recycling Week 7 Assignment Answers 2024
1. Which of the following is NOT required in an effective anaerobic reactor used for wastewater treatment?
a. Sludge Wasting
b. Aeration
c. pH Control
d. Gas collection
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2. In anaerobic treatment of wastewater, methane is produced from:
a. CH3OH
b. CH3COOH
c. H2 and CO2
d. All of the above
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3. VFA produced in anaerobic digestion refers to:
a. Volatile Fatty Acids
b. Valency Fixed Acetate
c. Vaporized Free Ammonia
d. Volume of Facultative Anaerobes
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4. Typically, the optimum pH range for methanogens is:
а. 4 – 5.5
b. 5.6 – 6.5
c. 6.6 – 7.6
d. 7.5 – 9.0
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5. Complex proteins and carbohydrates are converted to amino acids and sugars, via:
a. Hydrolysis
b. Acidogenesis
c. Acetogenesis
d. Methanogenesis
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6. Identify the correct statements regarding anaerobic systems for wastewater treatment:
Statement I: Relatively rapid acclimatization of anaerobic microbes leads to shorter startup times of anaerobic reactors compared to aerobic systems.
Statement II: Due to higher metabolism rate in absence of oxygen, anaerobic treatment systems have higher biomass yield compared to aerobic processes.
a. Statement I is correct, while statement II is incorrect
b. Statement II is correct, while statement I is incorrect
c. Both, statements I and II are correct
d. Both, statements I and II are incorrect
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7. Heavy metal present at higher concentrations in an anaerobic reactor, may lead to:
a. Process acceleration due to available metallic supplements
b. Process inhibition due to induced toxicity
c. Higher production of biomass
d. Rapid increase in pH inside the reactor
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8. A UASB reactor is typically NOT suitable for treating:
a. High strength industrial effluent
b. Low strength wastewater at small flows
c. Domestic sewage from densely populated urban areas
d. All of the above
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9.
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10. In a UASB reactor, which of the following components facilitate effluent outflow nearly free from solids and gases:
a. Settling Zone
b. Sludge Blanket
c. Distributed Inlet Arrangement
d. GLSS
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11. Which of the following is an anaerobic treatment system that does not require inert media for operation:
a. Upflow Anaerobic Sludge Blanket Reactor
b. Anaerobic Filter
c. Fluidized Bed Reactor
d. Anaerobic Fixed Film Reactors
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12. The required effective volume of the UASB reactor is (in m3):
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13. The COD of the treated effluent is (in mg/L):
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14. Assuming 60% (w/w) methane content in biogas, and density of methane as 465 kg/m3, the
daily production of methane in the reactor is (in m3/d):
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15. The daily sludge production in the reactor is (in kg /d):
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