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Full-Scale Operating Experience of Deep Bed Denitrification Filter Achieving <3 mg/l Total Nitrogen and <0.18 mg/l Total Phosphorus

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The Arlington County Wastewater Pollution Control Plant (ACWPCP) is located in the southern part of Arlington County, Virginia, USA and discharge to the Potomac River via the Four Mile Run. The ACWPCP was originally constructed in 1937 and has had several upgrades. In 2001, Arlington County, Virginia (USA) committed to expanding their 113,500 m3/d, (300,000 pe) secondary treatment plant to a 151,400 m3/d (400,000 pe) “ limit of technology” (LOT) treatment facility to achieve effluent total nitrogen (TN) to <3 mg/l and total phosphorus (TP) <0.18 mg/l. Key to this conversion was the implementation of deep bed denitrification filters to simultaneously achieve both low effluent TN and TP concentrations. A challenge with implementing this technology is maintaining a healthy denitrifying biomass within the denitrification filters while reducing an essential nutrient, phosphorus, to very low concentrations.

This paper will review the steps from concept to the first year of operation, including pilot and full– scale operating data of the deep bed denitrification filters.
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Keywords: Denitrification filters; limit of technology; nitrogen Removal; phosphorus removal

Document Type: Research Article

Publication date: 01 January 2011

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