Hotel Service Unit 10 Q5 Quiz

Correct Answer:
B) A process that requires oxygen to break down organic matter

Explanation:
Aerobic treatment involves microorganisms that need oxygen to break down organic matter in the sewage. This process typically occurs in an aeration tank where air is bubbled through the effluent, providing the necessary oxygen for bacteria to digest waste efficiently.

Correct Answer:
B) The plant has separate compartments, including a primary treatment tank, aeration tank, and settling tank, with the sewage flowing from one compartment to the next

Explanation:
A biological sewage treatment plant typically includes the following compartments:

• Primary Treatment Tank: Where large solids are separated from the wastewater.
• Aeration Tank: Air is bubbled through the effluent to supply oxygen to aerobic bacteria, which break down the organic matter.
• Settling Tank (Clarifier): The treated sewage is allowed to settle, with solids (sludge) sinking to the bottom and clear effluent at the top ready for further treatment or discharge.

The flow of sewage starts in the primary treatment tank, moves into the aeration tank, and finally enters the settling tank where solids settle, and clean water flows out.

Correct Answer:
A) A process that occurs in the absence of oxygen, using bacteria to break down waste

Explanation:
Anaerobic treatment occurs in environments where there is no oxygen. Anaerobic bacteria break down waste through a different process compared to aerobic bacteria, often producing gases like methane as a byproduct.