Hotel Service Unit 10 Q4 Quiz

Hotel Service Unit 10 Sewage Q4

1 / 5

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

A) At least 3 nautical miles from the nearest land

D) Only in port

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

B) Within 500 meters of the shore

2 / 5

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

D) Only in port waters

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

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

3 / 5

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

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

A) To heat the effluent

D) To remove solid particles

C) To mix the effluent more quickly

4 / 5

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

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

D) Cleansers can damage the ship’s structure

A) They can increase the volume of effluent produced

5 / 5

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

A) To neutralize the pH of the sewage

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

C) To increase the temperature of the discharge

D) To reduce the volume of the discharge

Your score is