Fluid treatment apparatus, systems, and methods

A method for treating fluid, said method comprising:

• providing fluid comprising one or more target compounds;
• removing said one or more target compounds from said fluid in a first system comprising adsorbent particles;
• regenerating said adsorbent particles in a second system, wherein said regenerating in said second system further comprises:
• accepting adsorbent particles via a first riser inlet;
• transporting adsorbent particles via a riser comprising a conduit to transport said adsorbent particles;
• and
• transferring adsorbent particles through a first riser outlet to exit said second system;
• providing a first connector between said first system and said second system, said connector configured to transfer said adsorbent particles from said first system to said second system;
• providing a second connector between said first system and said second system, said second connector configured to release said adsorbent particles from said second system, wherein said first system and said second system are decoupled such that the first system and the second system are positioned in entirely different locations relative to each other, under conditions effective to treat said fluid;
• and
• exposing said adsorbent particles to radiation via an energy delivery system.