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March 2013 Emerging Technologies Technology Summary State of Development: Emerging. Preliminary/Primary Treatment Salsnes Filter Objective: Removal of fine primary solids using a rotating belt screen. Description: prepared 2012 The Salsnes filter uses a removable fine mesh screen attached to an inclined moving belt of wire cloth to sieve solids from wastewater simultaneously filtering the water and dewatering the solids. The belt rotates to an “air knife” for self-cleaning with compressed air to remove the solids to a sludge compartment. In one installation, the Salsnes filter has proven to reduce influent BOD and TSS by 40% and 65% respectively (McElroy, 2012). Performance depends on the size distribution of influent solids and the size of the mesh selected for the filter screen which typically ranges from 100 to 500 microns (Sutton et al. 2008) although a 1000 micron mesh screen was installed at the Daphne Utilities WWTF. The screen surface hydraulic loading rate is an important factor affecting screen performance. A pressure transmitter varies belt speed to maintain liquid level at near the overflow elevation to assure effective flow distribution. The belt is backwashed to remove fats, oils, and grease. Filters are available in sizes with capacities up to 2200 gpm for free standing units and 3500 gpm for units installed in a concrete channel. Multiple units may be installed in parallel to achieve the desired capacity. A dewatering screw press is available to transport the solids, and when used can produce sludge at up to 27% solids (Sutton 2008). Comparison to Established Technologies: The Salsnes filter’s BOD and solids removal performance is equal to or better than traditional primary clarifiers (McElroy, 2012 and Sutton, 2008). According to the manufacturer, land requirements are approximately 1/10th that of primary clarifiers. Solids removed with the Salnes filter and screw press are significantly drier than for a primary clarifier, typically 27% and 4% respectively. Available Cost Information: Approximate Capital and O&M Costs: Capital cost is estimated at 30-50% less than for primary clarifiers Vendor Name(s): Salsnes Filter AS, Verftsgt. 11 7800 Namsos, Norway Telephone: +47 74 27 48 60 Web site: www.salsnes.com Trojan Technologies (US Representative) 3020 Gore Road London, Ontario Canada, N5V 4T7 Telephone: 1 888 220 6118 (US/CAN) Web site: www.trojanuv.com Key Words for Internet Search: Installation(s): Daphne Utilities WWTF, Daphne AL Salsnes filter, primary treatment, fine screen, rotating belt screen Data Sources: McElroy, R. et al., “Restoring Lost WWTP Capacity through Innovative Technologies”, WEFTEC 2012. Sutton, P. et al. “Rotating Belt Screens: An Attractive Alternative for Primary Treatment of Municipal Wastewater” WEFTEC 2008. Wastewater Treatment and In-Plant Wet Weather Management 2-33PDF Image | Emerging Tech for Wastewater Treatment
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