HONOLULU (KHON2) -- City and County of Honolulu Mayor Rick Blangiardi and the Department of Environmental Services are excited to announce a major infrastructure project to upgrade the In-Vessel Bioconversion facilities at the Sand Island Wastewater Treatment Plant (WWTP).
This $174 million contract represents a significant step in enhancing the capacity and efficiency of the state's largest treatment plant.
The upgrades at Sand Island WWTP will be carried out by Synagro-WWT, Inc., the design-build contractor. Hensel Phelps will handle construction, and Yogi Kwong Engineers, LLC will serve as the construction manager.
The project aims to enhance and expand the bioconversion capabilities to meet current and future wastewater treatment needs effectively.
Key project components include relocating and rebuilding the Effluent Water Reuse Pump Station, removing the old pump station and various underground utilities, and supplying power to the Maintenance and Lab Buildings.
The project will also involve constructing new underground utilities, electrical improvements, and site civil work.
Major upgrades include the addition of two new anaerobic digesters, two sludge storage tanks, a Digester Control Building, and a new tunnel and basement.
Further enhancements will include a new boiler system, hot water pumps, modifications to existing digesters and piping and the relocation and installation of flares, a propane gas tank, and new chemical dosing systems.
The project is scheduled for completion by October 2028.
This upgrade is a critical investment in Honolulu’s wastewater infrastructure. It will improve the efficiency and capacity of the Sand Island WWTP, supporting the city's growth and development.\
With the new anaerobic digesters and sludge storage tanks, the plant will be better equipped to handle increased waste volumes, contributing to a cleaner and healthier environment for Honolulu’s residents.