Guam to get first Ultraviolet installation

Consultancy Gresham, Smith and Partners has designed an advanced wastewater treatment plant which is now under construction in Santa Rita, Guam.

Consultancy Gresham, Smith and Partners has designed an advanced wastewater treatment plant which is now under construction in Santa Rita, Guam. The new Agat-Santa Rita Wastewater Treatment Plant will replace an existing facility operating 40% over capacity. The treatment plant will use biological nutrient removal via an oxidation ditch process and secondary clarification in compliance with the National Pollutant Discharge Elimination System, with effluent discharged through a deep ocean outfall pipe. Chemical addition and filtration can be added if enhanced phosphorus removal is needed in the future.

A repurposed pump station on the existing Agat site and a new pump station on the Baza Garden site will deliver raw wastewater to the facility, the latter via a cross-island force main/booster station system. Other major process components include influent flow equalization, fine screening, grit removal, and Guam’s first municipal ultraviolet disinfection process. As mandated by EPA, the plant’s initial wastewater treatment processes are scheduled to be operational by the end of 2016 to comply with the consent decree.

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