Large MBR Produces Low TN Reuse Water
Abstract:The City of Peoria was very progressive in their planning to secure their water future with the selection of an MBR process for its new 13 mgd (49,200 m3/d) Butler WRF. The flexibility of the MBR design to cost effectively accommodate current and future treatment capacity and provide the City with a renewable water supply was a winning combination. The biological process was designed to meet an 8-mg/L TN alert level with a permit limit of 10-mg/L. Since commissioning in June 2008, the plant has averaged a TN concentration of 4 mg/L. The key to the denitrification success is good DO control which minimizes oxygen returned to the anoxic zone and promotes SND in the biological basins. The impact of the DO variation on nitrification was illustrated by the inconsistency in the effluent ammonia. For a plant with a TN limit only, this operation is very successful; however, if a plant also had an ammonia limit, the operation could be challenging.
Document Type: Research Article
Publication date: January 1, 2010
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