City and County of Honolulu Mayor Rick Blangiardi and Department of Environmental Services have announced a significant infrastructure project aimed at upgrading the In-Vessel Bioconversion facilities at the Sand Island Wastewater Treatment Plant (WWTP). This contract is valued at $174 million and marks a crucial step towards enhancing the capacity and efficiency of the state’s largest plant.
The In-Vessel Bioconversion Facility Capacity Upgrades at Sand Island WWTP will be executed by Synagro-WWT, Inc., the design-build contractor. Construction will be handled by Hensel Phelps, while Yogi Kwong Engineers, LLC will serve as the construction manager. This project aims to enhance and expand the existing bioconversion capabilities, ensuring the plant can meet both current and future wastewater treatment demands effectively.
The scope of work includes relocating and reconstructing the Effluent Water Reuse Pump Station, removing the old pumps. Additionally, the project will construct new underground utilities, electrical improvements, and site civil work. Key upgrades include two new anaerobic digesters, two sludge storage tanks, a Digester Control Building, and a new tunnel and basement. Other enhancements involve installing a new boiler system, hot water pumps, modifying existing digesters and piping, relocating and installing flares, a propane gas tank, and new chemical dosing systems.
The project is scheduled to be completed by October 2028.
This upgrade is a vital investment in Honolulu’s wastewater infrastructure. The enhancements will not only improve the efficiency and capacity of the Sand Island WWTP but also support the city’s growth and development. With the new anaerobic digesters and sludge storage tanks, the plant will be better equipped to manage increased waste volumes, contributing to a cleaner and healthier environment for Honolulu’s residents.
