NEORSD Westerly Ferric Chloride Tanks
Osborn Engineering served as the District’s lead consultant for this project to replace the deteriorated ferric chloride tanks used for phosphorus removal that are housed within the Train Shed Building while increasing space and capacity. The new tanks are being installed in the Chemical Handling Building, which currently houses mostly abandoned chemical equipment.
Osborn’s scope included: rehabilitating the Chemical Storage Building, demolishing the old unused lime soles, lime handling equipment, structural reinforcing to support the new tanks, process improvements, mechanical, electrical and plumbing modifications and fire protection services. Osborn, along with our subconsultants, implemented an equipment configuration that balances cost, constructability, volume and flexibility to accommodate future phosphorus removal needs and chemically enhanced high rate treatment (CE-HRT).
The project posed many structural challenges including: partial demolition of in-place structural walls and floors, modifications of the in-place structure for egress and lateral stability, support of four new ferric chloride tanks holding an approximate total of 60,000 gallons of ferric chloride and providing mechanisms for movement of the ferric tanks within the existing structure.