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Type: Artigo
Title: Ammonium Removal From High-salinity Oilfield-produced Water: Assessing The Microbial Community Dynamics At Increasing Salt Concentrations
Author: Quartaroli
Larissa; Fidelis Silva
Livia C.; Silva
Claudio Mudadu; Lima
Helena Santiago; de Paula
Sergio Oliveira; de Oliveira
Valeria Maia; da Silva
Marliane de Cassia S.; Kasuya
Maria Catarina M.; de Sousa
Maira Paula; Torres
Ana Paula R.; Souza
Rodrigo Suhett; Bassin
Joo Paulo; da Silva
Cynthia Canedo
Abstract: Water generated during oil exploration is chemically complex and contains high concentrations of ammonium and, in some cases, high salinity. The most common way to remove ammonium from effluent is a biological process, which can be performed by different routes and different groups of microorganisms. However, the presence of salts in the effluents could be an inhibiting factor for biological processes, interfering directly with treatment. This study aimed to evaluate changes in the profile of a microbial community involved in the process of ammonium removal when subjected to a gradual increase of salt (NaCl), in which the complete inhibition of the ammonium removal process occurred at 125 g L-1 NaCl. During the sludge acclimatization process, samples were collected and submitted to denaturing gradient gel electrophoresis (DGGE) and massive sequencing of the 16S ribosomal RNA (rRNA) genes. As the salt concentration increased in the reactor, a change in the microbial community was observed by the DGGE band profiles. As a result, there was a reduction in the presence of bacterial populations, and an increase in archaeal populations was found. The sequencing data suggested that ammonium removal in the reactor was carried out by different metabolic routes by autotrophic nitrifying bacteria, such as Nitrosococcus, Nitrosomonas, Nitrosovibrio, Nitrospira, and Nitrococcus; ammonium-oxidizing archaea Candidatus nitrosoarchaeum; ANAMMOX microorganisms, such as Candidatus brocadia, Candidatus kuenenia, and Candidatus scalindua; and microorganisms with the potential to be heterotrophic nitrifying, such as Paracoccus spp., Pseudomonas spp., Bacillus spp., Marinobacter sp., and Alcaligenes spp.
Subject: Microbial Diversity
Heterotrophic Nitrification
16s Rrna Gene Survey
Editor: Springer
New York
Rights: fechado
Identifier DOI: 10.1007/s00253-016-7902-0
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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