Ocean City WWTP – Disinfection System Upgrades

Johnston Construction Company

• Converted the wastewater treatment plant's existing chlorine and sulfur dioxide gas disinfection systems to new liquid sodium hypochlorite and sodium bisulfite chemical-feed systems while maintaining continuous plant operations.
• Installed the new sodium hypochlorite system in the Chemical Facility and the sodium bisulfite system in the Equalization Basin Pumping Station, together with associated chemical-feed piping and appurtenances.
• Carefully sequenced shutdowns, tie-ins, testing, and commissioning so the existing chemical systems remained operational until the replacement systems were completely installed, tested, and approved for service.
• Completed demolition associated with the existing Process Building and Chemical Addition and coordinated subsequent construction of the Central Storage Building as part of the overall treatment-plant improvements.
• Performed extensive multi-trade construction involving site work, excavation, outside piping, cast-in-place concrete, masonry, structural and miscellaneous metals, roofing, building finishes, process mechanical systems, plumbing, and HVAC.