The city of Fort Lupton a growing Front Range community located along the South Platte River in Colorado, began operation of a new 5 MGD (18.93 MLD) membrane filtration system in 1997. Ten years later, the city received notice from the Colorado Department of Public Health and Environment of a Stage 1 Disinfection by-products (DBP) violation. In addition to the DBP challenges facing the city, the membrane plant faced increasing capacity demands and backwash waste disposal issues.
Initially, the city decided on an Enhanced Coagulation and Granular Activated Carbon (GAC) treatment plan to address their DBP challenges. However, the estimated $5.5 million cost of this approach would have put a substantial strain on the city’s budget. In 2009, Evoqua proposed an alternative solution: (1) a Clearlogx® chemical feed control system; (2) an upgrade of the existing polypropylene membranes to PVDF membranes; and, (3) an Adsorption Clarifier® system for backwash waste recovery. The approach was much more affordable, so the city immediately began work to install the Clearlogx system and upgrade the membrane system. The backwash recovery system was contracted in 2010.