Hotel Service Unit 10 Q1 Quiz

Hotel Service Unit 10 Sewage Q1

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Why is the final discharge from an approved sewage treatment plant chlorinated before discharge?

D) To make the discharge more visible

C) To neutralize the pH of the discharge

A) To increase the volume of discharge

B) To disinfect the treated sewage and kill any remaining pathogens before it is released into the sea

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What is the correct chlorine content of the final sewage discharge after treatment?

A) 5 ppm

C) 0.5 ppm

B) 1 ppm

D) 10 ppm

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According to MARPOL Annex IV, when can untreated sewage be discharged into the sea?

C) At any distance from shore, as long as the ship is stationary

B) At least 12 nautical miles from the nearest land, provided the ship is en route

D) Within an Emission Control Area (ECA)

A) Within 1 mile of the nearest land

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Which MARPOL Annex deals with the disposal of sewage from ships?

A) Annex I

D) Annex VI

B) Annex III

C) Annex IV

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How is chlorination of the final discharge from a sewage treatment plant carried out and monitored?

C) By boiling the sewage and testing for oxygen content

A) By adding chlorine manually and checking pH levels

D) By adding chlorine gas and monitoring the temperature of the sewage

B) By automatic dosing of chlorine, with regular checks on chlorine levels in the discharge

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When can sewage that has been comminuted and disinfected be discharged according to MARPOL Annex IV?

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

C) Within port waters

A) Within 3 nautical miles of the nearest land

D) Only in designated areas

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