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The pneumatic refuse conveying system (in short, PWCS) is a type of waste disposal system that uses air to move refuse through pipes to collection points.
Refuse is conveyed through steel pipes by a 20–25 meter per second air current to accomplish the goal.
Notable examples in Europe were implemented in the Stockholm area in Sweden. and Leganés and Barakaldo in Spain. Another well known, yet rarely seen example is the one used in the utilidors in the Magic Kingdom theme park in Orlando, Florida.
A pneumatic refuse collection system on Roosevelt Island, New York City, is said to be the largest in the United States and the only system in the U.S. serving a residential complex in this case nearly 10,000 people.
References
Pneumatic refuse conveying system Wikipedia(Text) CC BY-SA