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 Evaluation of a Subsurface-Flow Constructed Wetland for Onsite Wastewater Treatment Using NSF Standard 40 Protocol
Pablo A. Davila, Joe C. Yelderman Jr., Robert Doyle, Bruce Lesikar, Courtney O’Neill, and Samuel Rodriguez
Item Number: NRL2006AC-36
Shipping Weight: 0lbs. 0oz.
Price: $20.00
A subsurface-flow constructed wetland was evaluated (6 February to 31 May 2006) using the American National Standards Institute (ANSI)/NSF International- Standard 40 protocol for Class I onsite wastewater treatment at the Baylor Wastewater Research Program (BWRP) site within the Waco Metropolitan Area Regional Sewerage System (WMARSS) treatment plant, Waco, Texas. Raw wastewater from the WMARSS plant was pumped into a two-chambered 1,500 gallon septic tank and flowed by gravity into the 10 feet x 50 feet x 1 foot treatment wetland then returned to the WMARSS plant. Both septic tank and wetland effluent samples were collected and analyzed, according to Standard 40 criteria, for carbonaceous biochemical oxygen demand (CBOD5), total suspended solids (TSS), and pH. In addition, samples were analyzed for nutrients (total nitrogen and total phosphorus). Rainfall and temperature data were also collected for water budget calculations and to aid interpretations. Because this study used the Standard 40 protocol it allows direct comparison of treatment wetlands to other on-site treatment processes evaluated under Standard 40 protocol. The study provides results that may apply to feasibility of constructed wetlands in areas where traditional onsite treatment systems (septic tank and drain field) are not viable alternatives. The study also provides insight toward the appropriateness of Standard 40 for subsurface-flow treatment wetlands. Funding for this study was provided by the Texas On-Site Wastewater Treatment Research Council.