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Feasibility of hydraulic separation in a novel anaerobic-anoxic upflow reactor for biological nutrient removal

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Abstract
This contribution deals with a novel anaerobic-anoxic reactor for biological nutrient removal (BNR) from wastewater, termed AnoxAn. In the AnoxAn reactor, the anaerobic and anoxic zones for phosphate removal and denitrification are integrated in a single continuous upflow sludge blanket reactor, aiming at high compactness and efficiency. Its application is envisaged in those cases where retrofitting of existing wastewater treatment plants for BNR, or the construction of new ones, is limited by the available surface area. The environmental conditions are vertically divided up inside the reactor with the anaerobic zone at the bottom and the anoxic zone above. The capability of the AnoxAn configuration to establish two hydraulically separated zones inside the single reactor was assessed by means of hydraulic characterization experiments and model simulations. Residence time distribution (RTD) experiments in clean water were performed in a bench-scale (48.4 L) AnoxAn prototype. The required hydraulic separation between the anaerobic and anoxic zones, as well as adequate mixing in the individual zones, were obtained through selected mixing devices. The observed behaviour was described by a hydraulic model consisting of continuous stirred tank reactors and plug-flow reactors. The impact of the denitrification process in the anoxic zone on the hydraulic separation was subsequently evaluated through model simulations. The desired hydraulic behaviour proved feasible, involving little mixing between the anaerobic and anoxic zones (mixing flowrate 40.2 % of influent flowrate) and negligible nitrate concentration in the anaerobic zone (less than 0.1 mgN L-1) when denitrification was considered.
Keywords
Hydrodynamic behaviour, MULTI-ENVIRONMENT BIOREACTOR, Wastewater treatment, Numerical simulation, Denitrification, Mathematical modelling, Tracer tests, RESIDENCE TIME DISTRIBUTION, WATER TREATMENT-PLANT, WASTE-WATER, UASB REACTOR, DISPERSION ANALYSIS, AXIAL-DISPERSION, TRACER, MODEL, PERFORMANCE

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Chicago
Díez-Montero, Rubén, Loredana De Florio, Marta González-Viar, Eveline Volcke, and Iñaki Tejero. 2015. “Feasibility of Hydraulic Separation in a Novel Anaerobic-anoxic Upflow Reactor for Biological Nutrient Removal.” Bioprocess and Biosystems Engineering 38 (1): 93–103.
APA
Díez-Montero, R., De Florio, L., González-Viar, M., Volcke, E., & Tejero, I. (2015). Feasibility of hydraulic separation in a novel anaerobic-anoxic upflow reactor for biological nutrient removal. BIOPROCESS AND BIOSYSTEMS ENGINEERING, 38(1), 93–103.
Vancouver
1.
Díez-Montero R, De Florio L, González-Viar M, Volcke E, Tejero I. Feasibility of hydraulic separation in a novel anaerobic-anoxic upflow reactor for biological nutrient removal. BIOPROCESS AND BIOSYSTEMS ENGINEERING. 2015;38(1):93–103.
MLA
Díez-Montero, Rubén, Loredana De Florio, Marta González-Viar, et al. “Feasibility of Hydraulic Separation in a Novel Anaerobic-anoxic Upflow Reactor for Biological Nutrient Removal.” BIOPROCESS AND BIOSYSTEMS ENGINEERING 38.1 (2015): 93–103. Print.
@article{5897556,
  abstract     = {This contribution deals with a novel anaerobic-anoxic reactor for biological nutrient removal (BNR) from wastewater, termed AnoxAn. In the AnoxAn reactor, the anaerobic and anoxic zones for phosphate removal and denitrification are integrated in a single continuous upflow sludge blanket reactor, aiming at high compactness and efficiency. Its application is envisaged in those cases where retrofitting of existing wastewater treatment plants for BNR, or the construction of new ones, is limited by the available surface area. The environmental conditions are vertically divided up inside the reactor with the anaerobic zone at the bottom and the anoxic zone above. The capability of the AnoxAn configuration to establish two hydraulically separated zones inside the single reactor was assessed by means of hydraulic characterization experiments and model simulations. Residence time distribution (RTD) experiments in clean water were performed in a bench-scale (48.4 L) AnoxAn prototype. The required hydraulic separation between the anaerobic and anoxic zones, as well as adequate mixing in the individual zones, were obtained through selected mixing devices. The observed behaviour was described by a hydraulic model consisting of continuous stirred tank reactors and plug-flow reactors. The impact of the denitrification process in the anoxic zone on the hydraulic separation was subsequently evaluated through model simulations. The desired hydraulic behaviour proved feasible, involving little mixing between the anaerobic and anoxic zones (mixing flowrate 40.2 \% of influent flowrate) and negligible nitrate concentration in the anaerobic zone (less than 0.1 mgN L-1) when denitrification was considered.},
  author       = {D{\'i}ez-Montero, Rub{\'e}n and De Florio, Loredana and Gonz{\'a}lez-Viar, Marta and Volcke, Eveline and Tejero, I{\~n}aki},
  issn         = {1615-7591},
  journal      = {BIOPROCESS AND BIOSYSTEMS ENGINEERING},
  language     = {eng},
  number       = {1},
  pages        = {93--103},
  title        = {Feasibility of hydraulic separation in a novel anaerobic-anoxic upflow reactor for biological nutrient removal},
  url          = {http://dx.doi.org/10.1007/s00449-014-1247-9},
  volume       = {38},
  year         = {2015},
}

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