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Author Carrera, P.; Campo, R.; Mendez, R.; Di Bella, G.; Campos, J.L.; Mosquera-Corral, A.; Val del Rio, A. pdf  doi
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  Title Does the feeding strategy enhance the aerobic granular sludge stability treating saline effluents? Type
  Year 2019 Publication Chemosphere Abbreviated Journal Chemosphere  
  Volume 226 Issue Pages 865-873  
  Keywords Aerobic granular sludge; Fish canning wastewater; Nutrients removal; Salinity; AOB  
  Abstract The development and stability of aerobic granular sludge (AGS) was studied in two Sequencing Batch Reactors (SBRs) treating fish canning wastewater. R1 cycle comprised a fully aerobic reaction phase, while R2 cycle included a plug-flow anaerobic feeding/reaction followed by an aerobic reaction phase. The performance of the AGS reactors was compared treating the same effluents with variable salt concentrations (4.97-13.45 g NaCl/L) and organic loading rates (OLR, 1.80-6.65 kg CODs/(m(3).d)). Granulation process was faster in R2 (day 34) than in R1 (day 90), however the granular biomass formed in the fully aerobic configuration was more stable to the variable feeding composition. Thus, in R1 solid retention times (SRT), up to 15.2 days, longer than in R2, up to 5.8 days, were achieved. These long SRT5 values helped the retention of nitrifying organisms and provoked the increase of the nitrogen removal efficiency to 80% in R1 while it was approximately of 40% in R2. However, the presence of an anaerobic feeding/reaction phase increased the organic matter removal efficiency in R2 (80-90%) which was higher than in R1 with a fully aerobic phase (75-85%). Furthermore, in R2 glycogen-accumulating organisms (GAOs) dominated inside the granules instead of phosphorous-accumulating organisms (PADS), suggesting that GAOs resist better the stressful conditions of a variable and high-saline influent. In terms of AGS properties an anaerobic feeding/reaction phase is not beneficial, however it enables the production of a better quality effluent. (C) 2019 Elsevier Ltd. All rights reserved.  
  Address [Carrera, P.; Mendez, R.; Mosquera-Corral, A.; Val del Rio, A.] Univ Santiago de Compostela, Sch Engn, Dept Chem Engn, E-15782 Santiago De Compostela, Galicia, Spain, Email: paula.carrera@usc.es;  
  Corporate Author Thesis  
  Publisher Pergamon-Elsevier Science Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0045-6535 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000468709500094 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 1020  
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Author 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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Author Sepulveda-Mardones, M.; Campos, J.L.; Magri, A.; Vidal, G. doi  openurl
  Title Moving forward in the use of aerobic granular sludge for municipal wastewater treatment: an overview Type
  Year 2019 Publication Reviews In Environmental Science And Bio-Technology Abbreviated Journal Rev. Environ. Sci. Bio-Technol.  
  Volume 18 Issue 4 Pages 741-769  
  Keywords Aerobic granular sludge; Domestic sewage; Full-scale; Wastewater treatment plant  
  Abstract Activated sludge is one of the most widely implemented technologies for municipal wastewater treatment. Yet, more restrictive environmental standards demand for more efficient technologies. Aerobic granular sludge (AGS) is a promising alternative in this context since this technology has shown potential for simultaneous organic matter and nutrient removal using smaller bioreactors and consuming less energy. However, despite such engaging claims, only ca. 40 full-scale AGS systems have been installed worldwide after 30 years of development. This reduced implementation suggests the existence of significant bottlenecks for this technology, which currently only have partially been overcome. This overview aims to analyze the recent progress in R&D concerning aerobic sludge granulation for municipal wastewater treatment via the analysis of research articles and invention patents as well as to elucidate exiting technological gaps and development opportunities. Culturing methods aiming at fast granulation, long-term stability and excellent process performance are of utmost interest for promoting massive implementation of full-scale AGS systems. Moreover, the recovery of biomaterials from waste sludge could contribute to the implementation of the biorefinery paradigm in wastewater treatment plants.  
  Address [Sepulveda-Mardones, Mario; Vidal, Gladys] Univ Concepcion, Engn & Biotechnol Environm Grp, Environm Sci Fac, Concepcion, Chile, Email: glvidal@udec.cl  
  Corporate Author Thesis  
  Publisher Springer Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1569-1705 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000490631800001 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 1089  
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