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ENVIRONMENTAL TECHNOLOGY VERIFICATION: JOINT (NSF-EPA) VERIFICATION STATEMENT AND REPORT FOR THE REDUCTION OF NITROGEN IN DOMESTIC WASTEWATER FROM INDIVIDUAL RESIDENTIAL HOMES, WATERLOO BIOFILTER® MODEL 4-BEDROOM (NSF 02/03/WQPC-SWP)
Citation:
NSF International, AND Scherger Associates. ENVIRONMENTAL TECHNOLOGY VERIFICATION: JOINT (NSF-EPA) VERIFICATION STATEMENT AND REPORT FOR THE REDUCTION OF NITROGEN IN DOMESTIC WASTEWATER FROM INDIVIDUAL RESIDENTIAL HOMES, WATERLOO BIOFILTER® MODEL 4-BEDROOM (NSF 02/03/WQPC-SWP). U.S. Environmental Protection Agency, Washington, DC, 600/R-03/129.
Description:
Verification testing of the Waterloo Biofilter Systems (WBS), Inc. Waterloo Biofilter® Model 4-Bedroom system was conducted over a thirteen month period at the Massachusetts Alternative Septic System Test Center (MASSTC) located at Otis Air National Guard Base in Bourne, Massachusetts. Sanitary sewerage from the base residential housing was used for the testing. An eight-week startup period preceded the verification test to provide time for the development of an acclimated biological growth in the Waterloo® system. The verification test included monthly sampling of the influent and effluent wastewater, and five test sequences designed to test the unit response to differing load conditions and power failure. The Waterloo® system proved capable of removing nitrogen from the wastewater. The influent total nitrogen (TN), as measured by TKN, averaged 37 mg/L with a median of 37 mg/L. The effluent TN (TKN plus nitrite/nitrate) concentration averaged 14 mg/L over the verification period, with a median concentration of 13 mg/L, which included an average TKN concentration of 3.7 mg/L and a median concentration of 1.6 mg/L. The system operating conditions (on-demand pump and float settings) remained constant during the test. Routine maintenance and system checks were performed for most of the test, except when media (foam cubes) was added after four months of operation. Adding media may be part of on-going maintenance, especially in the first few months according to the WBS Design, Installation, and Service Manual.