Upper Blackstone Nutrient Upgrade

Modifications to secondary influent gates, add mixer/aerators to existing aeration tanks; mods to final settling tank gate distribution boxes; new magnesium hydroxide bldg., mods to sodium hydroxide system, carbon system pilot, carbon storage feed system; bioreactor air flow and control systems; bioreactor tank aeration diffuser systems, HVAC ATC panels, sludge recirculation pumping stations.