PRENITRIFICATION AND SEEDING FOR ENHANCED NITRIFICATION
Abstract:A prenitrification basin and seeding approach are proposed for the Lincoln, Nebraska Theresa Street Wastewater Treatment Facility to enhance nitrification capacity. The existing facilities do not have sufficient capacity for nitrification of the ammonia to permitted levels. The prenitrification basin will be used for treatment of high strength recycle streams from solids processing operations. These streams, occurring intermittently, recycle approximately 36 percent of the ammonia received at the facility. Process models indicate overall treatment basin volume will be reduced with the addition of the prenitrification basin. Recycle streams will be combined with a portion of return activated sludge in the aerated prenitrification basin resulting in a decrease of ammonia from over 500 mg/l in the recycle to 10 to 30 mg/l prior to combining with the main plant flow. The prenitrification basin will also:
result in higher temperatures for nitrifier growth
provide an enriched source of nitrifying organisms
eliminate the need to grow nitrifiers for recycle treatment
reduce shock loads from recycle streams
Document Type: Research Article
Publication date: 2004-01-01
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