KAI Design & Build completes construction of US ultraviolet disinfection system

KAI Design & Build has completed construction of a large ultraviolet disinfection system for the Metropolitan St Louis Sewer District (MSD). The company served as a sub-consultant on the $21.2m Lemay Wastewater Treatment Plant disinfection facility, along with global construction management consultant CH2M HILL.

The project included construction of a UV wastewater disinfection system utilising 3,600 individual UV bulbs. It has a treatment capacity of 240 million gallons of effluent per day.

The project also required two new 144in pre-stressed concrete cylinder pipe connections to existing structures, carrying the entire plant’s effluent flow. MSD said that its current boundaries cover 525 square miles and encompass all of St Louis City and about 80% of St Louis County.

Currently, the district operates seven wastewater treatment facilities with a capacity of 370 million gallons of wastewater per day.

KAI Resident Project Representative Dave Tesson said that construction layout and dimensioning of the UV disinfection system’s UV channels was a critical component of the project.

“The successful completion of this project demonstrates that it is possible for the owner’s project team including the contractor, engineer and construction manager to collectively work together to resolve the many challenges that develop during the construction of a complex project,” Tesson said.

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