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March 2013 Treatment prepared 2012 Emerging Technologies Technology Summary Treatment Shaft Objective: Automated capture and treatment of large combined sewer overflows in a compact structure. Minimal head loss, primary settling, skimming, fine screening, and disinfection in a unit. Description: State of Development: Innovative. The Treatment Shaft is a deep, in-ground, vertical shaft to provide disinfection and detention for wet-weather flows with low head loss. Treatment Shaft technology provides disinfection contact time, vessel flushing, air venting, odor control, surge control, skimming, settling, and fine screening in a compact structure suited for urban sites. During wet-weather conditions, water rises over an upstream interceptor weir and falls into the Treatment Shaft. For storms that exceed the shaft capacity, chlorine is automatically injected before the upstream weir via chemical mixers. The shaft fills and floatables are trapped on the upstream side of the shaft’s baffle wall. Solids settle in the shaft because of the low upward velocity in the shaft. After the shaft fills, raked bar screens activate and trap screenings of mostly neutrally buoyant materials while allowing treated water to overflow to discharge. As the storm event subsides, dewatering pumps activate and screenings and floatables are drawn down to around the 10-foot level. A flushing mode begins with a high-pressure nozzle system to keep in suspension any materials that would normally settle. The dewatering chopper pumps continue until the shaft is emptied. The shaft can then be injected with an odor-neutralizing solution. Process Flow Diagram for the Treatment Shaft Comparison to Established Technologies: Compared to traditional surface storage systems, the Treatment Shaft occupies approximately 15 percent of the surface area of a basin of the same volume (Gilberson, 2011). It has 30 to 50 percent lower capital cost than comparably sized tunnels or basins (Giulberson 2011). Simple shaft geometry minimizes head loss, allowing gravity operation and eliminating the need for booster pump stations. The Treatment Shaft system eliminates tunnel and associated drop shafts, riser shafts, construction shafts, ventilation structures, surge control tanks, and screening buildings. It also eliminates water infiltration and associated treatment costs, and manual disposal of screenings. Available Cost Information: Approximate Capital Cost: Example is $36.8 million for peak design flow of 1,206 MGD and storage capture volume of 6.8 MG (NIH Consultants, 2008) Approximate O&M Costs: Compared to tunnels or basins, the Treatment Shaft has automated operation and lower O&M requirements. Wastewater Treatment and In-Plant Wet Weather Management 4-11PDF Image | Emerging Tech for Wastewater Treatment
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