MWH Global provided design services for the Fulton Hogan upgrade of the New Plymouth Wastewater Treatment Plant known as Project Wai Taatari.
The main focus of the upgrade was to achieve efficient aeration treatment and provide additional capacity through asset optimization and treat flow and load for a 2040 design horizon. The upgrade converted existing Carousel-process aeration basins (race-track flow) into plug-flow biological nutrient-removal processes.
The process design in combination with high-speed centrifugal blowers, fine bubble diffusers, and aeration control package was used to reduce aeration power usage (on energy to flow ratio basis) by 25% while providing improved treatment of the incoming wastewater.
This paper describes how MWH’s design approach led to improved plant performance, energy savings for New Plymouth District Council and provided a successful outcome for Project Wai Taatari.