Anaerobic Digestion: A Comprehensive Guide to Biogas Production

Question 1

Which feedstock is most suitable for anaerobic digestion to generate biogas?

Accepted Answer

Corn stover

Answer

Wood chips

Answer

Plastic waste

Answer

Coal

Question 2

Anaerobic digestion occurs when organic matter is broken down in the absence of:

Accepted Answer

Oxygen

Answer

Hydrogen

Answer

Carbon dioxide

Answer

Nitrogen

Question 3

The primary product of anaerobic digestion is:

Accepted Answer

Biogas

Answer

Water

Answer

Hydrogen

Answer

Ethanol

Question 4

Which of the following materials would be unsuitable as a feedstock for anaerobic digestion?

Accepted Answer

Plastic

Answer

Animal manure

Answer

Food waste

Answer

Crop residues

Question 5

Which stage in anaerobic digestion is responsible for producing methane?

Accepted Answer

Methanogenesis

Answer

Acidogenesis

Answer

Acetogenesis

Answer

Hydrolysis

Question 6

A significant environmental benefit of anaerobic digestion is its ability to:

Accepted Answer

Reduce greenhouse gas emissions

Answer

Generate oxygen

Answer

Increase biodiversity

Answer

Purify water

Question 7

Which factor can negatively impact the efficiency of anaerobic digestion?

Accepted Answer

High concentration of heavy metals

Answer

Adequate moisture content

Answer

Optimal pH level

Answer

Balanced carbon-to-nitrogen ratio

Question 8

Bacteria in anaerobic digestion play a crucial role in:

Accepted Answer

Decomposing organic matter

Answer

Producing oxygen

Answer

Converting methane to carbon dioxide

Answer

Regulating pH levels

Question 9

Anaerobic digestion has applications in:

Accepted Answer

Wastewater treatment, biogas production, and soil enhancement

Answer

Mineral refining, water purification, and paper production

Answer

Nuclear waste disposal, metal extraction, and air pollution control

Answer

Oxygen generation, carbon capture, and plastic manufacturing

Question 10

Which of the following is NOT a common byproduct of anaerobic digestion?

Accepted Answer

Oxygen

Answer

Methane

Answer

Carbon dioxide

Answer

Nitrogen

Question 11

What is the optimal temperature range for mesophilic anaerobic digestion?

Accepted Answer

32-41 °C

Answer

10-17 °C

Answer

45-55 °C

Answer

60-70 °C

Question 12

Which of the following materials is generally NOT suitable for anaerobic digestion?

Accepted Answer

Plastic

Answer

Animal manure

Answer

Municipal wastewater

Answer

Food waste

Question 13

Which of the following factors can adversely affect the efficiency of anaerobic digestion?

Accepted Answer

Elevated ammonia concentration

Answer

Sufficient nutrients

Answer

Optimal pH level

Answer

Appropriate temperature

Question 14

In the anaerobic digestion process, what is the primary role of bacteria?

Accepted Answer

Break down organic matter and generate biogas

Answer

Control the growth of pathogens

Answer

Reduce pH levels

Answer

Produce oxygen

Question 15

Which industry is a significant producer of organic waste that can be utilized for anaerobic digestion?

Accepted Answer

Food processing

Answer

Automotive

Answer

Electronics

Answer

Textiles

Question 16

Which type of bacteria is primarily responsible for converting organic matter into biogas during anaerobic digestion?

Accepted Answer

Methanogenic bacteria

Answer

Aerobic bacteria

Answer

Chemotrophic bacteria

Answer

Phototrophic bacteria

Question 17

Identify the key factor that significantly affects the efficiency of anaerobic digestion:

Accepted Answer

Temperature

Answer

Wind speed

Answer

Light intensity

Answer

pH level

Question 18

What is the primary component of biogas produced during anaerobic digestion?

Accepted Answer

Methane

Answer

Hydrogen

Answer

Carbon dioxide

Answer

Nitrogen

Question 19

Which of the following is a major area where anaerobic digestion is widely applied?

Accepted Answer

Wastewater treatment

Answer

Food preservation

Answer

Paper production

Question 20

Identify the main environmental advantage associated with anaerobic digestion:

Accepted Answer

Greenhouse gas reduction

Answer

Deforestation prevention

Answer

Soil erosion control

Answer

Water conservation

Question 21

Indicate a promising future area of application for anaerobic digestion:

Accepted Answer

Bioplastic production

Answer

Textile dyeing

Answer

Space exploration

Answer

Automotive manufacturing

Question 22

What is the primary purpose of upgrading biogas before its utilization?

Accepted Answer

To enhance its quality and compatibility with natural gas networks

Answer

To increase its combustibility

Answer

To reduce its sulfur content