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STEP-FEED BNR PROCESS ACHIEVING TN < 4 mg/L: A Case Study of WSSC - Piscataway WWTP, Prince George's County, Maryland

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Piscataway WWTP is a 30 MGD advanced plant with average flow of 18 MGD, operating 3 of 4 parallel basins (see attached plant schematic). It is operated by Washington Suburban Sanitary Commission (WSSC), and located in Prince George's County, Maryland. The Plant undertook one of the first large-scale Step-Feed BNR applications in the nation, which went on line in the fall of 2000 with the purpose of achieving a seasonal goal of 8 mg/l TN. The step-feed process was selected due to its lower construction cost compared with other BNR processes, yet meeting the State's program to get POTW's to voluntarily meet a seasonal TN goal of 8 mg/l. The lower construction cost is attributed to smaller basins, no internal recirculation pumps, and no methanol addition systems when compared with other more conventional BNR processes. The process was designed to meet a seasonal TN limit of 5 mg/l. During the first year of operation, a monthly trial was conducted on the process, varying one or more operating parameter to test the process. Based on the first year's results, the 2002 operating parameters were adjusted to maximize nitrogen reduction, achieving TN monthly averages less than 4 mg/L from June to November 2002.

Document Type: Research Article


Publication date: January 1, 2003

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