Optimal Design of Stormwater Basins With Bio-Sorption Activated Media (Bam) in Karst Environments \u2013 Phase II: Field Testing of BMPs

U.S. Transportation Collection2020PDFTech ReportKibler, Kelly MChang, Ni-BinWanielista, Martin P.Wen, DanShokri, MohammadValencia, AndreaLustoso-Alves Jr, EranildoRice, NyleUniversity of Central FloridaFlorida. Dept. of Transportation. Roadway Design OfficeUnited States. Department of Transportation. University Transportation Centers (UTC) ProgramFlorida. Department of TransportationUnited StatesBest practicesCostsDesignDetention basinsField testsFiltersKarstNitrogenOptimizationRunoffWater quality managementStormwater BMPs,BMPsRoadway runoffBlanket filterBiosorption Activated MediaVertical reactorBDV24-977-20Final Report 3/1/2017 \u2013 3/30/2020Two new designs of stormwater Best Management Practices (BMPs) using Biosorption Activated Media (BAM) were developed, implemented, and tested: (1) blanket filters, located within a stormwater management facility, and (2) vertical infiltration reactors. The blanket filter, comprised of a 1-ft top-soil layer and 3-ft BAM layer, removed 60%-66% of TN, NOx, and NH3 from roadway runoff. Mean removals of total nitrogen (TN), nitrate-nitrite (NOx), and ammonia (NH3) within a 3-ft top-soil layer (containing no BAM) range from 78%-92%, exceeding mean removals observed in the blanket filter. Within a blanket filter, a 3-ft BAM layer removes considerably more nitrogen, and particularly NOx, as compared to 1.5-ft layer of BAM. Similarly, a 3-ft soil layer above the BAM layer may remove considerably more nitrogen as compared to a 1-ft soil layer. It is estimated that through a 20- to 30-year design life, the cost of each pound of TN removed by blanket filters (a 3-ft layer of BAM placed in the vadose zone with 1-ft soil coverage) is $611-$715, while each pound of NOx removed will cost $1,360-$1,590. Of six media configurations tested within vertical reactors, nitrogen removal was best achieved by a 4-ft layer of BAM; a mean 49% TN and over 53% NOx was removed from incoming stormwater. It is estimated that through a 20- to 30-year design life, the cost of each pound of TN removed by vertical reactors placed in the vadose zone is $453-$498. It is estimated that each pound of NOx removed will cost $701-$732.105