The largest operating ultraviolet wastewater disinfection system in the U.S.

Lemay WWTP UV & Disinfection Facilities
Metropolitan St. Louis Sewer District
St. Louis, MO

KAI provided construction management services to the Metropolitan St. Louis Sewer District (MSD) at the Lemay Wastewater Treatment Plant for the new chlorination and dechlorination facilities and installation of launder covers at existing clarifiers. This project is thought to be the largest operating ultraviolet (UV) wastewater disinfection system in the United States with over 3600 individual UV bulbs and 10,400 wire terminations to connect UV power and controls.

The Lemay Wastewater Treatment Plant originally commenced operation in 1968 with a capacity of 150 million gallons per day (MGD). KAI helped MSD manage the increase of plant capacity to 480 MGD under a previous construction management assignment.

The next phase of plant improvements was the development of pathogen removal capability at the plant. The work was performed while the plant remained in operation. KAI effectively coordinated and minimized plant shutdowns, assured the quality of the work and managed the project to timely completion within schedule parameters.

Services

Commissioning, Construction Management, Cost Estimating, Construction Administration, Scheduling, Constructability Review, Construction Inspection, Bidability Reviews

The Impact

By the Numbers

Treatment capacity – 240 MGD. Time to construct – 609 days. Approximate tons of reinforcement Required – 560. Approximate cubic yards of concrete required – 6500. Number of individual UV bulbs – 3600. Number of wire terminations to connect UV power and controls – 10,400.