Effects of partially saturated conditions on the metabolically active microbiome and on nitrogen removal in vertical subsurface flow constructed wetlands
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Autor/a
Pelissari, Catiane
García, Joan
Velasco-Galilea, María
Silva Souza, Samara
Heleno Sezerino, Pablo
Ávila, Cristina
Fecha de publicación
2018-05-08ISSN
0043-1354
Resumen
Nitrogen dynamics and its association to metabolically active microbial populations were assessed in two vertical subsurface vertical flow (VF) wetlands treating urban wastewater. These VF wetlands were operated in parallel with unsaturated (UVF) and partially saturated (SVF) configurations. The SVF wetland exhibited almost 2-fold higher total nitrogen removal rate (5 g TN m−2 d−1) in relation to the UVF wetland (3 g TN m−2 d−1), as well as a low NOx-N accumulation (1 mg L−1 vs. 26 mg L−1 in SVF and UVF wetland effluents, respectively). After 6 months of operation, ammonia oxidizing prokaryotes (AOP) and nitrite oxidizing bacteria (NOB) displayed an important role in both wetlands. Oxygen availability and ammonia limiting conditions promoted shifts on the metabolically active nitrifying community within ‘nitrification aggregates’ of wetland biofilms. Ammonia oxidizing archaea (AOA) and Nitrospira spp. overcame ammonia oxidizing bacteria (AOB) in the oxic layers of both wetlands. Microbial quantitative and diversity assessments revealed a positive correlation between Nitrobacter and AOA, whereas Nitrospira resulted negatively correlated with Nitrobacter and AOB populations. The denitrifying gene expression was enhanced mainly in the bottom layer of the SVF wetland, in concomitance with the depletion of NOx-N from wastewater. Functional gene expression of nitrifying and denitrifying populations combined with the active microbiome diversity brought new insights on the microbial nitrogen-cycling occurring within VF wetland biofilms under different operational conditions.
Tipo de documento
Artículo
Versión del documento
Versión aceptada
Lengua
English
Materias (CDU)
631 - Agricultura. Agronomía. Maquinaria agrícola. Suelos. Edafología agrícola
Páginas
61
Publicado por
Elsevier
Publicado en
Water Research
Citación
Pelissari, Catiane, Miriam Guivernau, Marc Viñas, Joan García, María Velasco-Galilea, Samara Silva Souza, Pablo Heleno Sezerino, and Cristina Ávila. 2018. "Effects Of Partially Saturated Conditions On The Metabolically Active Microbiome And On Nitrogen Removal In Vertical Subsurface Flow Constructed Wetlands". Water Research 141: 185-195. Elsevier BV. doi:10.1016/j.watres.2018.05.002.
Número del acuerdo de la subvención
MINECO/Programa Estatal de promoción del talento y su empleabilidad en I+D+I/FJCI-2014-22245/ES/ /
Program
Sostenibilitat en Biosistemes
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