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  2. Titan sub disaster: Five key questions that remain - AOL

    www.aol.com/news/titan-sub-disaster-five-key...

    Later that day, after the craft failed to resurface, the US Coast Guard was notified, sparking a vast search and rescue operation. The world watched and waited for news of the missing sub.

  3. Ballast water discharge and the environment - Wikipedia

    en.wikipedia.org/wiki/Ballast_water_discharge...

    The permit sets numeric ballast water discharge limits for commercial vessels 79 feet (24 m) in length or greater. EPA issued a separate permit for smaller commercial vessels in 2014. The small vessel permit was repealed by Congress in 2018, [15] and new vessel regulations are pending as of 2023. [16] [17]

  4. Drain-waste-vent system - Wikipedia

    en.wikipedia.org/wiki/Drain-waste-vent_system

    A drain-waste-vent system (or DWV) is the combination of pipes and plumbing fittings that captures sewage and greywater within a structure and routes it toward a water treatment system. It includes venting to the exterior environment to prevent a vacuum from forming and impeding fixtures such as sinks, showers, and toilets from draining freely ...

  5. Trap (plumbing) - Wikipedia

    en.wikipedia.org/wiki/Trap_(plumbing)

    Trap (plumbing) Water seal in drain pipe under a sink. Water enters at right, fills the trap, and continues left. Inverted siphoning occurs below the line "A". In plumbing, a trap is a U-shaped portion of pipe designed to trap liquid or gas to prevent unwanted flow; most notably sewer gases from entering buildings while allowing waste materials ...

  6. Grease trap - Wikipedia

    en.wikipedia.org/wiki/Grease_trap

    A grease trap (also known as grease interceptor, grease recovery device, grease capsule and grease converter) is a plumbing device (a type of trap) designed to intercept most greases and solids before they enter a wastewater disposal system. Common wastewater contains small amounts of oils which enter into septic tanks and treatment facilities ...

  7. Marine debris - Wikipedia

    en.wikipedia.org/wiki/Marine_debris

    Marine debris, also known as marine litter, is human-created solid material that has deliberately or accidentally been released in seas or the ocean.Floating oceanic debris tends to accumulate at the center of gyres and on coastlines, frequently washing aground, when it is known as beach litter or tidewrack.

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