The difference between night and day is for real at the Butler Water Reclamation Facility in Peoria, Ariz. Proud owners of a brand-new membrane bioreactor (MBR) system, one of the largest in the world, plant supervisor Ray Trahan and his staff have had to adjust their processes in response to dramatic changes in diurnal flows. The hot desert weather is a factor, as well.
“Depending on the time of year, we may have almost no flow between 4 and 6 a.m.,” says Trahan. “We’ve had to make changes in order to provide a steady flow to our membranes. And our hot
