How Do Cruise Ships Handle Sewage

As HERKIMER noted the sewage is treated on board. Waste water is the second biggest part of onboard waste. On some cruise ships especially many of those that travel in Alaskan waters sewage is treated using Advanced Wastewater Treatment AWT systems that generally provide improved screening treatment disinfection and sludge processing as compared with traditional MSDs marine sanitation devices.

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As a result all of those millions of passengers and crew members dining and defecating and showering on the oceans have left filthy discharges in their wake.

How do cruise ships handle sewage. At present the cruise lines have a few options for dealing with waste. The best of the new ships process the sewage onboard to the point where the liquids are clean enough to drink as they do on the International Space Station although on ships the drinkable-clean reprocessed water is discharged back into the ocean. Its now positioned near San Franciscos Hunters Point.

Federal law requires that cruise ships only dump treated wastewater if they are within three nautical miles of shore. The solid waste is seperated from the Liquid waste. Ships can dump treated sewage anywhere in the ocean except in Alaskan waters where companies must comply with higher state standards.

Law allows cruise ships to dump raw sewage in the ocean once a ship is more than three miles off US. Cruise ships are not subject to the requirement for federal permits covering sewer and waste disposal systems that are de rigueur for the resorts and hotels on land. The solids are then dried and the liquid from this process is added to the liquid waste stream.

Plastic goes through this massive compactor. Green brown and white. Every ship has its own environment officer and crew are responsible for their own recycling.

EBMUD issued a special discharge permit to Princess Cruises and on March 11 crews began bringing the sewage from ship to shore. Even with aeration systems designed to reduce the amount of water coming out of bathroom taps and shower heads the average ship will. Some cruise lines press the food waste in a giant trash compactor dry it and then burn it to produce hot water for your shower.

It is then sterilized using UV light and released into the ocean when clean enough to do so. They will generate about 42 million gallons of sewage sludge. Most modern cruise ships have a 4 stage sewage treatment plant that produces drinking quality water in the final stage.