Free ammonia inhibition in microalgae and cyanobacteria grown in wastewaters: Photo-respirometric evaluation and modelling.

Autor: Rossi S; Politecnico di Milano, Department of Civil and Environmental Engineering (DICA), P.zza L. da Vinci, 3, 20133 Milan, Italy., Díez-Montero R; GEMMA-Group of Environmental Engineering and Microbiology, Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya-BarcelonaTech, c/ Jordi Girona 1-3, Building D1, 08034 Barcelona, Spain., Rueda E; GEMMA-Group of Environmental Engineering and Microbiology, Department of Civil and Environmental Engineering, Escola d'Enginyeria de Barcelona Est (EEBE), Universitat Politècnica de Catalunya-BarcelonaTech, Av. Eduard Maristany 16, Building C5.1, 08019 Barcelona, Spain., Castillo Cascino F; Istituto Sperimentale Italiano Lazzaro Spallanzani, Località La Quercia, 26027 Rivolta d'Adda, Italy., Parati K; Istituto Sperimentale Italiano Lazzaro Spallanzani, Località La Quercia, 26027 Rivolta d'Adda, Italy., García J; GEMMA-Group of Environmental Engineering and Microbiology, Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya-BarcelonaTech, c/ Jordi Girona 1-3, Building D1, 08034 Barcelona, Spain., Ficara E; Politecnico di Milano, Department of Civil and Environmental Engineering (DICA), P.zza L. da Vinci, 3, 20133 Milan, Italy. Electronic address: elena.ficara@polimi.it.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2020 Jun; Vol. 305, pp. 123046. Date of Electronic Publication: 2020 Feb 19.
DOI: 10.1016/j.biortech.2020.123046
Abstrakt: The inhibitory effects of free ammonia (FA) on microalgae/cyanobacteria in wastewater-treating photobioreactors (PBR) can strongly reduce their treatment efficiency, increasing the operational costs and undermining the stability of the system. Although FA-promoting conditions (high pH, temperature and ammoniacal nitrogen concentration) are commonly met in outdoor PBRs, photosynthesis inhibition from FA has been scarcely explored and is rarely considered in microalgae-bacteria growth models. Two pilot systems and a series of lab-scale monocultures were tested using a photo-respirometry approach, to evaluate the effects of FA (8.5-136 mg NH 3  L -1 ) on photosynthesis. Two mathematical inhibition models were compared, with the aim of selecting best-fitting equations to describe photo-respirometric experiments. A set of calibrated inhibition parameters was obtained for microalgae and cyanobacteria, growing in monocultures or in mixed algae-bacteria consortia. Cyanobacteria were more sensitive to FA than green microalgae and mixed phototrophs-bacteria consortia showed a higher resistance compared to monocultures. Estimated inhibition parameters were used to describe common operational/environmental conditions in algae-bacteria systems, demonstrating the potential drop in photosynthetic activity under those relevant operational conditions.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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