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) 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.

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:
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:
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.