Sewage Treatment and Regulations Quiz

What is the primary environmental impact of untreated sewage discharge into aquatic ecosystems?

• It reduces water temperature.

• It increases oxygen content.

• It leads to eutrophication due to high nitrate and phosphate levels.

• It enhances aquatic biodiversity.

How does the Annex IV regulation ensure compliance among ships on international voyages regarding sewage discharge?

• By limiting ship sizes allowed at sea.

• By requiring periodic surveys and certification.

• By prohibiting ships from holding sewage.

• By permitting unlimited discharge in international waters.

Ships that do not have an approved sewage treatment plant must manage sewage discharge by:

• Storing it in holding tanks for later discharge ashore.

• Discharging it within 3 nautical miles from the coast.

• Comminuting and disinfecting it only at port.

• Allowing untreated discharge in polar regions.

Which component of a Sewage Treatment Plant (STP) is responsible for initial separation of solid waste?

• Chlorinator

• Biofilter

• Screen Filter

• Air Blower

In which part of the STP does aerobic microorganism activity break down organic waste?

• Chlorination Chamber

• Biofilter Reactor

• Holding Tank

• Activated Carbon Chamber

What is a primary function of the chlorinator in the STP process?

• Filter physical solids

• Introduce microorganisms

• Provide air to the system

• Disinfect water before discharge

Under what condition is it permitted to discharge untreated sewage at sea, according to Annex IV?

• Within 12 nautical miles of the nearest land

• In an emergency to save lives at sea

• When not in a Special Area

• When a Sewage Pollution Certificate is renewed

Which of the following components helps in reducing Chemical Oxygen Demand (COD) in treated sewage?

• Chlorinator

• Biofilter

• Activated Carbon

• Discharge Pump

A ship with a certified comminuting and disinfecting system can discharge treated sewage:

• Only within port reception facilities

• Up to 12 nautical miles from the nearest land

• Within 3 nautical miles from the nearest land

• Within polar regions without restrictions

Why is the Discharge Pump necessary in the final stage of sewage treatment?

• To clean the biofilter

• To control the initial inflow of sewage

• To safely discharge treated water overboard

• To sterilize effluent before release