Hotel Service Unit 10 Q3 Quiz

Correct Answer:
B) Aerobic bacteria digest organic waste in the presence of oxygen, breaking it down into simpler compounds like water and carbon dioxide

Explanation:
In an aerobic sewage treatment plant, aerobic bacteria use oxygen to break down organic matter, converting it into simpler, non-harmful substances such as water and carbon dioxide. Oxygen is essential for these microorganisms to function efficiently.

Correct Answer:
B) Anaerobic bacteria take over, leading to incomplete breakdown of waste and the production of foul-smelling gases like hydrogen sulfide

Explanation:
Without a continuous supply of oxygen, anaerobic bacteria take over the breakdown process. This results in incomplete waste digestion and the release of harmful gases like hydrogen sulfide (H₂S), which can cause odors and create hazardous conditions.

Correct Answer:
C) It is necessary for aerobic bacteria to metabolize and break down organic waste efficiently

Explanation:
Aerobic bacteria require oxygen to metabolize and digest organic waste. Without sufficient oxygen, these bacteria cannot function, leading to inefficient treatment of sewage.

Correct Answer:
B) By bubbling air through the effluent using diffusers or aeration pumps

Explanation:
Aeration systems, such as air diffusers or pumps, ensure a continuous supply of oxygen by bubbling air through the effluent. This provides the oxygen required by aerobic bacteria to break down the waste efficiently.

Correct Answer:
B) Using mechanical surface aerators to agitate and oxygenate the sewage

Explanation:
Mechanical surface aerators are used to stir and mix the sewage with air, ensuring that oxygen is distributed throughout the effluent. This promotes efficient waste digestion by aerobic bacteria.