Design-Build Otay Water Treatment Plant Sodium Hypochlorite Disinfection System Upgrade – San Diego, CA

Jul 15, 2018

This design-build project was to upgrade the Otay Water Treatment Plant’s disinfection system to ensure compliance with upcoming safety regulations regarding the storage of chlorine gas. Orion designed and constructed a new on-site Sodium Hypochlorite Generation System, a new containment tank farm, chemical storage facility, a brine storage tank, sodium hypochlorite tanks, and new SCADA relay systems.

The work was completed in phases to allow the treatment plant operations to continue during constructino. Phase I included the construction and startup of a temporary sodium hypochlorite system utilizing the plant’s existing infrastructure. Phase II included demolition of the chlorine gas system, containment farm construction, and installation of sodium hypochlorite generators. Phase III upgraded to the new chlorine dioxide system.

This project won the APWA Honor Award in 2017.