Milliken WWTP Chemical Feed Additions


The antimony mitigation at the Milliken Wastewater Treatment Plant included the addition of chemical feed mixing/aging/blending systems to comply with new NPDES antimony discharge limits. Harper’s Environmental Systems Division (ESD) performed the work under a tight deadline, finishing more than a week ahead of schedule and allowing the owner to test and commission the facility ahead of the regulatory deadline. Work included the installation of bulk chemical storage tanks and a tank farm containment facility. The site also houses chemical metering and caustic and polymer pump feed stations, aeration basin transfer pumps with HDPE fusion welded piping, and mechanical, electrical and instrumentation appurtenances.

What People Are Saying

“Due to the nature of the project we had an extremely tight timeline. The Harper team turned the bid around quickly and mobilized within a week with a fully staffed team on site. They worked a 6/7-day schedule without efficiency loss and brought the system up 1.5 weeks ahead of time. This gave us the necessary time to make sure the system was commissioned before regulatory deadlines. Throughout the project, the Harper team in the field worked closely with our engineers to make the design decisions necessary for the project to be successful. They used their construction insight to suggest cost saving alternatives to the original approach that helped the project come in under budget.”

Paul Dodd
Senior Sourcing Manager
(for Milliken WWTP Chemical Feed Additions)

“This fairly complex project was under an intense schedule due to deadlines imposed by the regulatory agency. Harper responded by meeting a short bid period (2-3 weeks), rapid mobilization and working 6-7 days/week to achieve the schedule.”

Thomas H. Graves, P.E.
Designer Engineer, Rogers & Callcott Environmental
(for Milliken WWTP Chemical Feed Additions)