The primary constituent of sewage gas generated via bacterial anaerobic digestion of organic matter during waste treatment is __________________?
Show answer Hide answer
Answer: B. CH4
Explanation
Anaerobic bacteria break down complex organic waste materials in the absence of oxygen. This biological digestion process produces a biogas composed predominantly of methane gas. Methane generation is the primary objective of waste treatment anaerobic digestion systems. Sewage gas or biogas typically contains significant percentages of methane and carbon dioxide. Microbial action converts domestic sludge into stabilized organic residues and renewable fuel. Anaerobic digestion operates in sealed bioreactors maintained under controlled temperature conditions.
Municipal wastewater treatment plants capture sewage gas to generate electricity and heat. Utilizing biogas reduces greenhouse gas emissions and provides a sustainable renewable energy source. Waste-to-energy technologies play a vital role in modern urban environmental engineering. Hydrogen is produced in very minor amounts during specific stages of anaerobic fermentation. Carbon dioxide is a major co-constituent but is not the primary component of biogas. Nitrogen appears in trace quantities originating from dissolved air in the sewage feed.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. Poor storage conditions leading to low-temperature coal oxidation do not cause a reduction in its______________________?
Show answer Hide answer
Answer: D. Oxygen content
Low-temperature coal oxidation causes oxygen molecules to chemically bond with the carbon structure. This addition of atmospheric oxygen increases the total oxygen content of the weathered coal. Therefore, poor storage c...
Q2. Low-temperature oxidation processes in coal find acceleration through the____________________?
Show answer Hide answer
Answer: A. Storage in large heaps
Storing coal in large heaps creates a massive thermal mass that traps internally generated oxidation heat effectively. Restricted air circulation inside large piles supplies enough oxygen for slow oxidation while prevent...
Q3. Stored coal undergoing low-temperature oxidation experiences________________?
Show answer Hide answer
Answer: D. All A., B. and A.
Oxidation during coal storage degrades its chemical structure and reduces caking power. Calorific value drops because oxygen atoms displace combustible carbon and hydrogen atoms. Simultaneously, chemical absorption of at...
Q4. Natural gas consists predominantly of ________________?
Show answer Hide answer
Answer: A. CH4 (upto 90%)
Natural gas is a naturally occurring hydrocarbon mixture found deep beneath the earth surface. Methane serves as the primary chemical constituent and generally accounts for ninety percent volume. Other heavier hydrocarbo...
Q5. Benzol is chiefly made up of ____________________?
Show answer Hide answer
Answer: A. Benzene, toluene & xylene
Benzol recovered from the carbonization of coal is primarily a complex liquid hydrocarbon mixture. Aromatic compounds like benzene, toluene, and xylene make up the vast majority of its volume. These valuable chemicals ar...
Q6. The Lurgi gasifier is classified as a pressurized ______________ bed reactor?
Show answer Hide answer
Answer: A. Moving
The Lurgi gasifier operates continuously by feeding solid fuel downward against an upward blast. This mechanical arrangement creates a moving bed where coal progressively undergoes various thermal zones. The designation...