Theory 3(Sewage)(RN)

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  • Created by: Moles12!
  • Created on: 22-05-21 15:06
What are the possible health hazards from contacting raw sewage ?
Typhoid
Hepatitis
Gastro-enterius
1 of 9
Why are sewage plants fitted to our ships ?
So that we can comply with MARPOL regulations
2 of 9
List 6 advantages of using a sewage treatment plant
Reduces number of ship side openings
Simplifies pipe runs
heads and bathrooms can be lower down in the ship
Heads and bathrooms can be used whilst in dry docks
ships can operate in anti pollution areas
easier to close down in CBRN conditions
3 of 9
Name the two types of sewage plant in use
Biological
Colllect,hold and transfer(CHT)
4 of 9
Describe the process of biologically treating sewage
Raw sewage is turned into a slurry then transferred to an aeration tank where air is bubbled through the slurry which encourages the micro organisms to digest the slurry this is known as aerobic digestion.
5 of 9
If the air supply is lost what will happen(biological sewage processing) ?
The micro organisms will die and and start to anaerobically digest the sewage which produces hydrogen sulphide.
6 of 9
Describe the process on how the CHT system works
sewage is collected in large tanks which have a holding capacity of 12 days and it is either discharged overboard if outside the 12NM limit or transfered to a shoreside facility.
7 of 9
List 3 Hazards associated with operating a sewage plant
Dangerous chemicals
Raw sewage
Dangerous gasses
8 of 9
List 4 precautions to be taken when working in a sewage plant.
Medical precautions-check for cuts and abrasions(minimise infection)
Personal hygiene
Personal protection(PPE)
Monitor atmosphere(H2S)
9 of 9

Other cards in this set

Card 2

Front

Why are sewage plants fitted to our ships ?

Back

So that we can comply with MARPOL regulations

Card 3

Front

List 6 advantages of using a sewage treatment plant

Back

Preview of the front of card 3

Card 4

Front

Name the two types of sewage plant in use

Back

Preview of the front of card 4

Card 5

Front

Describe the process of biologically treating sewage

Back

Preview of the front of card 5
View more cards

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