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Author del Rio, A.V.; Campos, J.L.; Da Silva, C.; Pedrouso, A.; Mosquera-Corral, A. pdf  doi
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  Title Determination of the intrinsic kinetic parameters of ammonia-oxidizing and nitrite-oxidizing bacteria in granular and flocculent sludge Type
  Year 2019 Publication Separation And Purification Technology Abbreviated Journal Sep. Purif. Technol.  
  Volume 213 Issue Pages 571-577  
  Keywords Ammonia oxidizing bacteria; Flocs; Granules; Kinetics; Monod; Nitrite oxidizing bacteria  
  Abstract The different oxygen affinities of ammonia-oxidizing (AOB) and nitrite-oxidizing bacteria (NOB) are often used to define the operational strategy to achieve partial nitritation (PN) required before the anammox (AMX) process. For this purpose, apparent kinetic parameters are mainly used in the case of granular sludge, which can lead to errors when defining the operational conditions to obtain only nitritation (avoiding nitratation). In the present study, a mathematical methodology is proposed to determine the intrinsic kinetic parameters of AOB and NOB in granular sludge based on data obtained by respirometric assays. Additionally, the oxygen affinity constant (K-O2) and maximum specific rate (r(max)) of flocculent and granular sludge sample, produced under mainstream and sidestream conditions were determined at various temperatures (15, 20 and 30 degrees C). The results show that for granules, the intrinsic K-O2 and r(max) values were lower and higher, respectively, than the apparent values. Furthermore, the K-O2 values for flocs and granules at all of the tested temperatures were lower for NOB than for AOB. The values obtained for the kinetic parameters indicated that it is impossible to maintain partial nitritation by only controlling the dissolved oxygen concentration.  
  Address [del Rio, Angeles Val; Pedrouso, Alba; Mosquera-Corral, Anuska] Univ Santiago de Compostela, Dept Chem Engn, Sch Engn, E-15705 Santiago De Compostela, Spain, Email: mangeles.val@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 1383-5866 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000457657200054 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 977  
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Author del Rio, A.V.; da Silva, T.; Martins, T.H.; Foresti, E.; Campos, J.L.; Mendez, R.; Mosquera-Corral, A. pdf  doi
openurl 
  Title Partial Nitritation-Anammox Granules: Short-Term Inhibitory Effects of Seven Metals on Anammox Activity Type
  Year 2017 Publication Water Air And Soil Pollution Abbreviated Journal Water Air Soil Pollut.  
  Volume 228 Issue 11 Pages 9 pp  
  Keywords Ammonia oxidizing bacteria; Anammox; Granules; IC50; Nitrogen removal  
  Abstract The inhibitory effect of seven different metals on the specific anammox activity of granular biomass, collected from a single stage partial nitritation/anammox reactor, was evaluated. The concentration of each metal that led to a 50% inhibition concentration (IC50) was 19.3 mg Cu+2/L, 26.9 mg Cr+2/L, 45.6 mg Pb+2/L, 59.1 mg Zn+2/L, 69.2 mg Ni+2/L, 174.6 mg Cd+2/L, and 175.8 mg Mn+2/L. In experiments performed with granules mechanically disintegrated (flocculent-like sludge), the IC50 for Cd+2 corresponded to a concentration of 93.1 mg Cd+2/L. These results indicate that the granular structure might act as a physical barrier to protect anammox bacteria from toxics. Furthermore, the presence of an external layer of ammonia oxidizing bacteria seems to mitigate the inhibitory effect of the metals, as the values of IC50 obtained in this study for anammox activity were higher than those previously reported for anammox granules. Additionally, the results obtained confirmed that copper is one of the most inhibitory metals for anammox activity and revealed that chromium, scarcely studied yet, has a similar potential inhibitory effect.  
  Address [del Rio, Angeles Val; Mendez, Ramon; Mosquera-Corral, Anuska] Univ Santiago de Compostela, Inst Technol, Dept Chem Engn, E-15782 Santiago De Compostela, Spain, Email: mangeles.val@usc.es  
  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 0049-6979 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000415958200002 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 790  
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Author Jungles, M.K.; Val del Rio, A.; Mosquera-Corral, A.; Campos, J.L.; Mendez, R.; Costa, R.H.R. pdf  doi
openurl 
  Title Effects of Inoculum Type and Aeration Flowrate on the Performance of Aerobic Granular SBRs Type
  Year 2017 Publication Processes Abbreviated Journal Processes  
  Volume 5 Issue 3 Pages 10 pp  
  Keywords aeration flowrate; aerobic granules; inoculum; sequencing batch reactor; wastewater  
  Abstract Aerobic granular sequencing batch reactors (SBRs) are usually inoculated with activated sludge which implies sometimes long start-up periods and high solids concentrations in the effluent due to the initial wash-out of the inoculum. In this work, the use of aerobic mature granules as inoculum in order to improve the start-up period was tested, but no clear differences were observed compared to a reactor inoculated with activated sludge. The effect of the aeration rate on both physical properties of granules and reactor performance was also studied in a stable aerobic granular SBR. The increase of the aeration flow rate caused the decrease of the average diameter of the granules. This fact enhanced the COD and ammonia consumption rates due to the increase of the DO level and the aerobic fraction of the biomass. However, it provoked a loss of the nitrogen removal efficiency due to the worsening of the denitrification capacity as a consequence of a higher aerobic fraction.  
  Address [Jungles, Mariele K.; Costa, Rejane H. R.] Fed Univ Santa Catarina UFSC, CTC, ENS, Dept Sanit & Environm Engn, BR-88010970 Florianopolis, SC, Brazil, Email: marielejungles@hotmail.com;  
  Corporate Author Thesis  
  Publisher Mdpi Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2227-9717 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000412051700009 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 944  
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Author Morales, N.; del Rio, A.V.; Vazquez-Padin, J.R.; Mendez, R.; Campos, J.L.; Mosquera-Corral, A. pdf  doi
openurl 
  Title The granular biomass properties and the acclimation period affect the partial nitritation/anammox process stability at a low temperature and ammonium concentration Type
  Year 2016 Publication Process Biochemistry Abbreviated Journal Process Biochem.  
  Volume 51 Issue 12 Pages 2134-2142  
  Keywords Anammox; AOB; Granules; Nitrogen; NOB; Partial nitritation  
  Abstract Extensive research on the anammox-based processes under mainstream conditions is currently in progress. Most studies have used a long acclimation period for the partial nitritation-anammox (PN-An) sludge at a low temperature and ammonium concentration. However, in this study, the results demonstrated that PN-An granular biomass produced under sidestream conditions (30 degrees C and 1000 mg NH4+-N/L) can operate at 15 degrees C and 50 mg NH4+-N/L without acclimation. The nitrogen removal efficiency was 70% and was stable for 60 days. The long-termoperation of the system with progressive adaptation provided important information for process optimization. Control of the dissolved oxygen (DO) concentration was crucial to maintain the balance between ammonia oxidizing bacteria (AOB) and anammox bacteria activities. A calculation of the oxygen penetration depth inside the granules is proposed to estimate an adequate DO level, which allows for the definition of the aerobic and anoxic zones that depend on the temperature, the size distribution and the granule density. However, the development of NOB was difficult to avoid with DO control alone. The selective washing-out of the floccular biomass, which contains mainly NOB, is proposed, leaving the granular fraction with the AOB and anammox bacteria in the system. (C) 2016 Published by Elsevier Ltd.  
  Address [Morales, Nicolas; del Rio, Angeles Val; Mendez, Ramon; Campos, Jose L.; Mosquera-Corral, Anuska] Univ Santiago de Compostela, Inst Technol, Dept Chem Engn, E-15705 Santiago De Compostela, Spain, Email: nicolas.morales@usc.es;  
  Corporate Author Thesis  
  Publisher Elsevier Sci Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1359-5113 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000390733500029 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 685  
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Author Pedrouso, A.; del Rio, A.V.; Campos, J.L.; Mendez, R.; Mosquera-Corral, A. pdf  doi
openurl 
  Title Biomass aggregation influences NaN3 short-term effects on anammox bacteria activity Type
  Year 2017 Publication Water Science And Technology Abbreviated Journal Water Sci. Technol.  
  Volume 75 Issue 5 Pages 1007-1013  
  Keywords anammox; granules; inhibition; NOB; partial nitritation; sodium azide  
  Abstract The main bottleneck to maintain the long-term stability of the partial nitritation-anammox processes, especially those operated at low temperatures and nitrogen concentrations, is the undesirable development of nitrite oxidizing bacteria (NOB). When this occurs, the punctual addition of compounds with the capacity to specifically inhibit NOB without affecting the process efficiency might be of interest. Sodium azide (NaN3) is an already known NOB inhibitor which at low concentrations does not significantly affect the ammonia oxidizing bacteria (AOB) activity. However, studies about its influence on anammox bacteria are unavailable. For this reason, the objective of the present study was to evaluate the effect of NaN3 on the anammox activity. Three different types of anammox biomass were used: granular biomass comprising AOB and anammox bacteria (G1), anammox enriched granules (G2) and previous anammox granules disaggregated (F1). No inhibitory effect of NaN3 was measured on G1 sludge. However, the anammox activity decreased in the case of G2 and F1. Granular biomass activity was less affected (IC50 90 mg/L, G2) than flocculent one (IC50 5 mg/L, F1). Summing up, not only does the granular structure protect the anammox bacteria from the NaN3 inhibitory effect, but also the AOB act as a barrier decreasing the inhibition.  
  Address [Pedrouso, A.; Val del Rio, A.; Mendez, R.; Mosquera-Corral, A.] Univ Santiago de Compostela, Sch Engn, Dept Chem Engn, E-15705 Santiago De Compostela, Spain, Email: alba.pedrouso@usc.es  
  Corporate Author Thesis  
  Publisher Iwa Publishing Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0273-1223 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000395822800001 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 712  
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