High-throughput nitritation of reject water with a novel ammonium control loop
This work presents a new control system for the nitritation of high-strength ammonium wastewater as reject water from sludge dewatering. It is based on three independent feedback control loops: (i) DO control by manipulating the aeration flow-rate, (ii) pH control with the addition of solid Na₂CO₃ a...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2014 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:169684 |
| Acceso en línea: | https://ddd.uab.cat/record/169684 https://dx.doi.org/urn:doi:10.1016/j.cej.2013.11.056 |
| Access Level: | acceso abierto |
| Palabra clave: | Anammox AOB Control Partial nitrification Nitritation TAN |
| Sumario: | This work presents a new control system for the nitritation of high-strength ammonium wastewater as reject water from sludge dewatering. It is based on three independent feedback control loops: (i) DO control by manipulating the aeration flow-rate, (ii) pH control with the addition of solid Na₂CO₃ and (iii) control of NH₄+-N concentration in the reactor using the influent flow-rate as the manipulated variable. Its application in an activated sludge configuration with one reactor and a settler, demonstrated: (i) capability to achieve stable effluent composition with proper NO₂-N/NH₄+-N ratio for anammox treatment and ii) possibility to obtain an effluent with full nitritation suitable for heterotrophic denitrification only modifying the ammonium setpoint. A nitrogen loading rate (NLR) up to 5.0 ± 1.0 gN L⁻¹ d⁻¹ was stably treated using real reject water (T = 30ºC, pH = 7.5) with a NO₂-N/(NO₂-N+NO₃-N) ratio of 99%. NLR reached up to 9.3 ± 0.5 gN L⁻¹ d⁻¹ with synthetic wastewater. |
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