Where does the poop go?: The hidden machines of cruise ships

Cruise ships are entire cities set to sea—the largest ones can carry thousands of people. To function far from shore, floating burgs like these rely on washing machines that swallow hundreds of pounds of sheets, ­water-filtration systems that serve both fresh- and saltwater swimming pools, and an army of aerobic bacteria to eat tanks of poop. This is the often-hidden machinery working behind the scenes on an average mega-liner.

To clean seawater, ships often rely on two main methods. Reverse-osmosis membranes filter out salt, and evaporators use heat from the engine to boil off the fresh HExhaust scrubbersExhaust scrubbers are the most innovative machinery on ships today. Before venting, exhaust enters a cylindrical tank. A solution of caustic soda or seawater sprays from all angles to trap toxic sulfur oxides. Then, the solution falls 150 feet into a storage tank.

on the poop deck!

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