Hotel Service Unit 10 Q4 Quiz

Hotel Service Unit 10 Sewage Q4

1 / 5

Why is calcium hypochlorite added to treated sewage before discharge overboard?

C) To increase the temperature of the discharge

A) To neutralize the pH of the sewage

D) To reduce the volume of the discharge

B) To disinfect the treated sewage by killing any remaining bacteria or pathogens

2 / 5

Why is air bubbled through the effluent in the aeration tank of an aerobic sewage treatment plant?

C) To mix the effluent more quickly

A) To heat the effluent

D) To remove solid particles

B) To provide oxygen to aerobic bacteria, which break down organic waste

3 / 5

According to IMO regulations, under what conditions can sewage be discharged into the sea?

C) At any distance from land if the sewage is treated

D) Only in port waters

A) At least 12 nautical miles from land for untreated sewage, provided the ship is en route

B) At least 1 nautical mile from land for untreated sewage

4 / 5

When can comminuted and disinfected sewage be discharged according to IMO regulations?

B) Within 500 meters of the shore

C) At least 4 nautical miles from the nearest land, provided the ship is en route

D) Only in port

A) At least 3 nautical miles from the nearest land

5 / 5

Why must care be taken when choosing toilet cleansers used on board a ship?

D) Cleansers can damage the ship’s structure

A) They can increase the volume of effluent produced

C) Cleansers can improve the performance of the treatment plant

B) Some cleansers may kill the bacteria in sewage treatment plants, reducing the efficiency of the biological treatment process

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