The Lab Detective was asked to provide some informal training about nitrogen removal in wastewater treatment plants, including a discussion of the various flow schemes used to remove nitrogen from the waste stream and return it to the atmosphere.
Always one to oblige, the detective launched into a lengthy description of the various forms of nitrogen in raw wastewater, how it got there, and where it goes. "Nitrogen enters the waste stream mostly from human beings in the form of urea," he explained.
"This organic form of nitrogen experiences some changes through the wastewater
