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Boeing 787 toilets, like those on most commercial aircraft, use a vacuum system to flush and store waste, drawing it into a holding tank through a series of pipes via a powerful suction. 

 

Here's a more detailed explanation:

• Vacuum System:

  When you press the flush button, a valve opens at the bottom of the toilet bowl, exposing it to a pneumatic vacuum. 

   
• Waste Removal:

  This vacuum sucks the waste and blue cleaning fluid into a "closed waste system" or holding tank through a series of pipes. 

   
• Vacuum Creation:

  The toilet suction works by pressure difference, with the toilet bowl connected to a waste tank kept at lower pressure. 

   
• On the ground:

  When on the ground, a pump is used to create a vacuum. 

   
• In the air:

  In the air, the pressure difference is created using the lower external pressure compared to the pressurized cabin. 

   
• Storage:

  The waste collected in the holding tank is stored until the aircraft lands.