Wastewater process diagrams from the 1990s typically showed an arrow in the lower right corner pointing off the page into space, typically reading “sludge to disposal.”
Calling what we now know as biosolids a waste to be disposed of is no longer widely accepted. With the advent of the Federal Part 503 regulations in the early 1990s, biosolids became viewed as a resource. That is emphatically true at the Central Valley Water Reclamation Facility, which serves seven Utah communities and some 500,000 people just south of Salt Lake City.The facility (75 mgd design) treats an average flow of 50 mgd of
