Case Study

Project Profile: Norfolk Southern Railroad Treats Stormwater Pond With ETS-UV™ Disinfection System For Dust Suppression Use

NORFOLK SOUTHERN

CUSTOMER PROFILE

Norfolk Southern has a history of nearly two centuries of service that has linked communities and customers to the marketplace of the world. The railway company operates approximately 20,000 miles of rails and serves every major container port in the eastern United States while providing connections to other rail carriers.

Norfolk Southern’s Lamberts Point Coal terminal is a coal transload facility located on the Elizabeth River in Norfolk, Virginia. The heart of the terminal is Pier 6, where oceangoing colliers are loaded with metallurgical and steam coal used to produce steel and electricity worldwide. Twin tandem rotary dumpers feed the shiploaders for a combined dumping capacity of up to 8,000 tons per hour. The versatility offered at Pier 6 allows the loading of vessels that range in size from small coastwise barges to large capsize vessels.

THE CHALLENGE

‚ÄčIn an effort to continue the model of sustainability and to continue the commitment of environmental stewardship, Norfolk Southern wanted to reuse the water from a stormwater pond to wash down coal cars as they are being loaded for the purpose to control dust. Before reusing the stormwater, Norfolk Southern wanted to ensure that potential bacteria in the pond water, such as Enterococci, E. Coli, and Fecal Coliform, would be removed.

THE SOLUTION

After consideration of a variety of processes, ETS-UV SW systems were selected because of the prove ability to disinfect wastewater.

Two SW-425-6 systems were selected for this project. The two units, arranged in parallel are preceded by a GAC system that removes the coal fines and other larger contaminants prior to UV disinfection. The UV disinfected water is then pumped and used for the wash-down of the cars.

The project has enhanced health of the river’s ecosystem by reducing stormwater runoff and by conserving water. The recycling of this system has reduced its use of municipal water by approximately 1.5 million gallons per month.

SPECIAL DESIGN FEATURES

PRODUCT DESIGN AND CONTINUOUS IMPROVEMENT
We believe that good design should make products safe, understandable, innovative and useful. Through the continued relationship of service, we examine wear throughout the product lifecycle and rely on Field Service Technician feedback on product improvement.  We also utilize a variety of design tools that provide emulation of system performance. This has led to many of the innovative features that have been a source of advantage.

  • Emulate the performance of UV systems by using advanced software tools
  • Use Finite Element Analysis (FEA) to understand how the UV chambers will become stressed under hydraulic pressure
  • Predict weakness in design with Computational Fluid Dynamics (CFD)

PLUG & PLAY CONNECTION
Single ended lamps utilize a twist lock plug connection that automatically centers the lamp.  No tools are required.  This is safer for operators and maintenance crews as the UV light and electricity are isolated with a water tight connection.

DRY MONITORING
Allows for replacement of monitors and reference monitor checks without having to close valves and drain the reactor, saving maintenance time.

ACCESS HATCH
The hatch was designed to eliminate flow disruptions and air pockets.  This feature makes it easier for routine maintenance of the chamber without the removal of the end flanges. 

ONE PIECE WIPER RING
Viton wiper rings fit directly onto the stainless steel yoke.  This design reduces components while not impacting performance and cleaning capabilities.

ENERGY EFFICIENT MOTOR
Low voltage, 24V motor leads to safer, smaller and less expensive wiper option without impacting performance or cleaning capabilities.

NO PROBLEMATIC LIMIT SWITCHES
Optical counter used to stop wiping mechanism before reaching the chamber ends.  Similar technology used in elevators to signal flow levels.