Sewage Treatment and MARPOL Regulations

What is the primary reason untreated sewage is prohibited from being discharged into the sea?

• Sewage contains harmful bacteria that consume oxygen from the water, affecting marine life

• Sewage contributes to marine biodiversity that consume oxygen from the water, affecting marine life

• Sewage enhances water circulation that consume oxygen from the water, affecting marine life

• Sewage prevents algal blooms that consume oxygen from the water, affecting marine life

What is the function of a Sewage Treatment Plant (STP) on a ship according to MARPOL Annex IV?

• To filter air from sewage & discharge into the sea

• To store sewage for later discharge

• To treat sewage for safe discharge into the sea

• To collect sewage for recycling & discharge into the sea

How does the biofilter in an STP contribute to sewage treatment?

• By removing suspended solids from sewage through aerobic microorganisms

• By diffusing air bubbles to break down organic matter through aerobic microorganisms

• By filtering out chemical pollutants through aerobic microorganisms

• By chemically disinfecting sewage before discharge

What is the consequence of discharging untreated sewage in proximity to coastal waters as per MARPOL Annex IV?

• It promotes the natural growth of marine organisms

• It depletes oxygen levels, causing harm to marine ecosystems

• It helps in maintaining the natural nutrient balance

• It enhances fish production by giving them unlimited supply of food source

Which sewage waste component is classified as "blackwater" according to MARPOL Annex IV?

• Wastewater from laundry drains

• Drainage from toilets and urinals

• Condensate from air conditioning systems

• Waste from galley washbasins

What is the purpose of the chlorinator in a sewage treatment system?

• To filter out large solids from sewage

• To aerate the sewage for microorganism activity

• To disinfect the treated sewage before discharge

• To separate solid waste from water

What is the function of the settling/sedimentation chamber in a ship's sewage treatment plant?

• To disinfect sewage using chemicals

• To separate treated water from sludge

• To filter out solid particles from untreated sewage

• To reduce Chemical Oxygen Demand (COD)

According to MARPOL Annex IV, which of the following ships is required to comply with sewage pollution prevention regulations?

• Ships under 200 gross tonnage

• Ships certified to carry more than 15 persons

• Ships engaged in voyages within a single country's waters

• Ships only engaged in cargo transportation

How does greywater differ from blackwater in the context of MARPOL Annex IV?

• Greywater includes sewage from toilets; blackwater includes laundry wastewater

• Greywater comes from dishwashers and showers; blackwater comes from toilets and urinals

• Greywater contains chemical waste; blackwater contains organic waste

• Greywater is treated sewage; blackwater is untreated sewage

Under MARPOL Annex IV, which of the following circumstances allows the discharge of untreated sewage into the sea?

• When the ship is in a designated sewage discharge area

• When discharging is necessary for saving human life

• When sewage levels exceed the tank's capacity

• When the ship is in a coastal zone