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Author (up) Vergara, C.; Munoz, R.; Campos, J.L.; Seeger, M.; Jeison, D. pdf  doi
  Title Influence of light intensity on bacterial nitrifying activity in algal-bacterial photobioreactors and its implications for microalgae-based wastewater treatment Type
  Year 2016 Publication International Biodeterioration & Biodegradation Abbreviated Journal Int. Biodeterior. Biodegrad.  
  Volume 114 Issue Pages 116-121  
  Keywords Nitrification; Ammonium oxidizer; Nitrite oxidizer; Microalgal-bacterial consortium; Photobioreactor; Photoinhibition; Wastewater treatment  
  Abstract The influence of irradiance on the nitrifying activity in photobioreactors of a bacterial consortium enriched from a wastewater treatment bioreactor was assessed using independent ammonium oxidation kinetic batch tests and respirometric assays. Culture irradiance below 250 μmol m(-2) s(-1) did not show a significant effect on nitrification activity, while irradiance at 500 and 1250 μmol m(-2) s(-1) caused a decrease of 20 and 60% in the specific total ammonium nitrogen removal rates and a reduction of 26 and 71% in the specific NO3- production rates, respectively. However, no significant influence of irradiance on the affinity constant of NH4+ oxidation was observed. The increasing nitrite accumulation at higher light intensities suggested a higher light sensitivity of nitrite oxidizers. Additionally, NH4+ oxidation respirometric assays showed a decrease in the oxygen uptake of 14 and 50% at 500 and 1250 μmol m(-2) s(-1), respectively. The experimental determination of the light extinction coefficient (lambda) of the nitrifying bacterial consortium (lambda = 0.0003 m(2) g(-1)) and of Chlorella sorokiniana (lambda = 0.1045 m(2) g(-1)) allowed the estimation of light penetration in algal-bacterial high rate algal ponds, which showed that photo inhibition of nitrifying bacteria can be significantly mitigated in the presence of high density microalgal cultures. 2016 Elsevier Ltd. All rights reserved.  
  Address [Vergara, C.; Jeison, D.] Univ La Frontera, Dept Chem Engn, Francisco Salazar 01145, Temuco, Chile, Email:  
  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 0964-8305 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000383528000016 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 657  
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