At the 75th Street Wastewater Treatment Plant in Boulder, Colo., five resource recovery specialists (RRS) manage biosolids. Their collective experience runs into decades. That experience came into play during a three-year plant expansion that included major upgrades to the biosolids process. The team used its experience to work with consultants and contractors on project components ranging from equipment selection to building layout. The new process includes a more efficient dewatering system using centrifuges and an automated loading system for the trucks hauling cake to land application sites.Paul Heppler, operations supervisor, acknowledges that working on the new design, in addition to
