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Author (up) Campos, J.L.; del Rio, A.V.; Pedrouso, A.; Raux, P.; Giustinianovich, E.A.; Mosquera-Corral, A. pdf  doi
openurl 
  Title Granular biomass floatation: A simple kinetic/stoichiometric explanation Type
  Year 2017 Publication Chemical Engineering Journal Abbreviated Journal Chem. Eng. J.  
  Volume 311 Issue Pages 63-71  
  Keywords Anaerobic; Anammox; Denitrification; Granule; Methane; Nitrogen  
  Abstract Floatation events are commonly observed in anammox, denitrifying and anaerobic granular systems mostly subjected to overloading conditions. Although several operational strategies have been proposed to avoid floatation of granular biomass, until now, there is no consensus about the conditions responsible for this phenomenon. In the present study, a simple explanation based on kinetic and stoichiometric principles defining the aforementioned processes is provided. The operational zones corresponding to evaluated parameters where risk of floatation exists are defined as a function of substrate concentration in the bulk liquid and the radius of the granule. Moreover, the possible control of biomass floatation by changing the operating temperature was analyzed. Defined operational zones and profiles fit data reported in literature for granular biomass floatation events. From the study the most influencing parameter on floatation occurrence has been identified as the substrate concentration in the bulk media. (C) 2016 Elsevier B.V. All rights reserved.  
  Address [Campos, J. L.; Raux, P.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Avda Padre Hurtado 750, Vina Del Mar, Chile, Email: jluis.campos@uai.cl  
  Corporate Author Thesis  
  Publisher Elsevier Science Sa Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1385-8947 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000392768200008 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 697  
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Author (up) Carrera, P.; Mosquera-Corral, A.; Mendez, R.; Campos, J.L.; del Rio, A.V. pdf  doi
openurl 
  Title Pulsed aeration enhances aerobic granular biomass properties Type
  Year 2019 Publication Biochemical Engineering Journal Abbreviated Journal Biochem. Eng. J.  
  Volume 149 Issue Pages 7 pp  
  Keywords Aerobic granular sludge; Pulsed aeration; Phosphate accumulating organisms; Low-strength wastewater  
  Abstract The reduced footprint of Aerobic Granular Sludge (AGS) systems constitutes a good alternative to conventional treatments, despite their associated drawbacks (long start-up periods and high aeration requirements for granules formation and integrity). This study presents a pulsed aeration regime as a strategy to overcome these problems. Two AGS sequencing batch reactors (SBRs) were operated treating low-strength wastewater (190 mg COD/L) with pulses of 1 s ON/2 s OFF (R1) and continuous aeration (R2). Initially, different superficial gas velocities (SGV) of 3.6 cm/s (R1) and 1.2 cm/s (R2) were imposed for the same airflow (448 L/cycle). The granulation process was completed in 38 days for R1 whereas it took 48 days for R2. Denser and smaller granules were formed with pulsed regime and phosphate accumulating organisms were developed faster. The removal efficiencies were practically the same in both SBRs, being of 85% for COD, 95% for phosphorus and 30% for nitrogen. After granules formation the airflow in both reactors was reduced. For a SGV of 1.2 cm/s both systems behaved similarly. The minimum SGV required to maintain a uniform mixture of the biomass inside the reactor was 1.2 (R1) and 0.5 cm/s (R2), meaning less air consumption in the pulsed system (149 L/cycle) compared to the continuous one (179 L/min). Therefore, pulsed aeration successfully reduced granulation periods and aeration requirements in AGS systems.  
  Address [Carrera, P.; Mosquera-Corral, A.; Mendez, R.; Val del Rio, A.] Univ Santiago de Compostela, Dept Chem Engn, Sch Engn, E-15782 Santiago De Compostela, Spain, Email: paula.carrera@usc.es;  
  Corporate Author Thesis  
  Publisher Elsevier Science Bv Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1369-703x ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000475997900003 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 1014  
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