Microbial succession within an anaerobic sequencing batch biofilm reactor (ASBBR) treating cane vinasse at 55ºC

Ribas, Maria Magdalena Ferreira; Chinalia, Fábio Alexandre; Pozzi, Eloísa; Foresti, Eugênio

doi:10.1590/s1516-89132009000400028

Cited by 18 publications

(21 citation statements)

References 15 publications

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“…The presence of carbon fibers in the electrodes could lead to high methane production efficiencies by protecting the methanogenic community from high levels of residuals VFA and salts, which may act as stressors (Sasaki et al 2009(Sasaki et al , 2011b. The correlation between a higher methane yield and the higher abundance of Methanosaeta is to be expected, since an OLR of only 2 g COD L -1 d -1 was applied, leading to circumstances that favor Methanosaeta over Methanosarcina , Ribas et al 2009). However, as there was no significant difference in community composition between anode and cathode biofilm, nor was there any difference between the planktonic phase in the different reactors, with or without electrodes, it can be confirmed that there was no effect of the applied cell potential and that biofilm development was the crucial factor to obtain stable methane production.…”

Section: Discussionmentioning

confidence: 99%

Biomass retention on electrodes rather than electrical current enhances stability in anaerobic digestion

et al. 2014

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Anaerobic digestion (AD) is a well-established technology for energy recovery from organic waste streams. Several studies noted that inserting a bioelectrochemical system (BES) inside an anaerobic digester can increase biogas output, however the mechanism behind this was not explored and primary controls were not executed. Here, we evaluated whether a BES could stabilize AD of molasses. Lab-scale digesters were operated in the presence or absence of electrodes, in open (no applied potential) and closed circuit conditions. In the control reactors without electrodes methane production decreased to 50% of the initial rate, while it remained stable in the reactors with electrodes, indicating a stabilizing effect. After 91 days of operation, the now colonized electrodes were introduced in the failing AD reactors to evaluate their remediating capacity. This resulted in an immediate increase in CH 4 production and VFA removal. Although a current was generated in the BES operated in closed circuit, no direct effect of applied potential nor current was observed. A high abundance of Methanosaeta was detected on the electrodes, however irrespective of the applied cell potential. This study demonstrated that, in addition to other studies reporting only an increase in methane production, a BES can also remediate AD systems that exhibited process failure. However, the lack of difference between current driven and open circuit systems indicates that the key impact is through biomass retention, rather than electrochemical interaction with the electrodes.

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Section: Discussionmentioning

confidence: 99%

Biomass retention on electrodes rather than electrical current enhances stability in anaerobic digestion

et al. 2014

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“…Neste cenário alguns estudos, como o de Ribas et al (2009) buscam propor melhores formas de disposição do resíduo no solo agrícola através do seu tratamento prévio.…”

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Monitoramento da salinidade de águas subterrâneas em várzea cultivada com cana-de-açúcar fertirrigada com vinhaça

Silva

Almeida

Rolim

et al. 2014

Rev. bras. eng. agríc. ambient.

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Propôs-se, neste trabalho, avaliar o risco potencial da vinhaça em proporcionar a salinidade e sodicidade das águas subterrâneas em área de várzea cultivada com cana-de-açúcar. O experimento foi conduzido em uma Usina da Mata Sul de Pernambuco durante o período de dezembro de 2010 a setembro de 2011. O dispositivo experimental adotado foi composto de uma malha georreferenciada de 81 poços de monitoramento distribuídos ao longo de uma área de 7,5 ha constituindo três subáreas com 2,5 ha, todas cultivadas com cana-de-açúcar. Na área foram aplicadas doses equivalentes a 50, 60 e 65 m³ ha-1 de vinhaça de mosto de melaço. Para a avaliação da qualidade da água subterrânea foram realizadas seis amostragens e analisados os parâmetros CE, pH, Na+, Ca2+, Mg2+ e RAS. A aplicação de doses de vinhaça até 65 m³ ha-1, em áreas de várzea, para os parâmetros analisados, não proporcionou riscos de salinização das águas subterrâneas nem, tampouco, a CE e a RAS para a salinidade e sodicidade no período avaliado. O monitoramento dos parâmetros químicos do lençol freático mostrou, ao longo do tempo, redução de suas concentrações em função da precipitação pluviométrica ocorrida no período estudado.

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“…Las biopelículas microbianas están conformadas por diferentes estratos, cada uno con complejas agrupaciones (Rochex et al, 2009); donde microorganismos pueden ocupar regiones específicas condicionando la estructura de la biopelícula (Tian et al, 2016); además, la estatura y composición de una biopelícula cambia a lo largo del tiempo impulsada por cambios ambientales, disponibilidad de nutrientes y factores intrínsecos a las biopelículas (Ribas et al, 2009;Luria et al, 2016).…”

Section: Discussionunclassified

Diversidad bacteriana asociada a biopelículas anódicas en celdas de combustible microbianas alimentadas con aguas residuales.

Collazos

Montaño

2017

Acta biol. Colomb.

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RESUMENEl presente trabajo evaluó la diversidad bacteriana asociada a las biopelículas formadas sobre los ánodos de celdas de combustible microbianas, por medio del análisis del gen del ARNr 16S y observaciones por microscopía electrónica de barrido. Se construyeron celdas de combustible microbianas de una cámara que permanecieron en operación durante 30 días utilizando muestras ambientales como inóculo y único sustrato energético; las celdas fueron monitoreadas en función de la producción de energía durante el desarrollo del experimento; al finalizar los ensayos, se realizó la caracterización molecular y observaciones mediante microscopía electrónica de barrido a las biopelículas formadas. Se reportan valores de densidad de potencia máxima de 4,85 mW/m 2 para el agua residual doméstica y de 1,85 mW/m 2 para el caso del agua residual industrial, con disminuciones de 71 % de la DBO para el agua residual doméstica y de 59 % de la DBO para el caso del agua residual industrial. Se logró la recuperación de 15 secuencias únicas provenientes de la amplificación del gen del ARNr 16S obtenidas a partir de las biopelículas formadas sobre los ánodos. El análisis filogenético ubicó estas secuencias en la clase Deltaproteobacteria. Los dos sustratos ambientales contienen una importante e interesante diversidad microbiana, mostrándolos promisorios para la construcción y operación de MFC y la implementación de procesos de biodegradación de materia orgánica.Palabras clave: aguas residuales, ARNr 16S, celdas de combustible microbianas, diversidad bacteriana, generación de energía, microscopia electrónica de barrido. ABSTRACTThis study evaluated the bacterial diversity associated with biofilms formed on the anode of microbial fuel cells (MFC), by analyzing the 16S rRNA gene and observations by scanning electron microscopy. Single chambered MFC were constructed and kept in operation for 30 days using environmental samples as inoculum and sole energy substrate; the MFC were monitored as a function of energy production in the course of the experiment; at endpoint, molecular characterization and observations using scanning electron microscopy was performed to the formed biofilms. Values of maximum power density of 4.85 mW/m2 for domestic wastewater and 1.85 mW/m2 in the case of industrial wastewater are reported, with declines of 71 % of the BOD for domestic wastewater and 59 % of the BOD in the case of industrial wastewater. Recovery of 15 unique sequences from the amplification of 16S rRNA gene obtained from the biofilms formed on the anodes was accomplished. Phylogenetic analysis placed these sequences in the Deltaproteobacteria class. The two environmental substrates contain an important and interesting microbial diversity, showing them very promising for the construction and operation of MFC and implementing biodegradation of organic material.

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Microbial succession within an anaerobic sequencing batch biofilm reactor (ASBBR) treating cane vinasse at 55ºC

Abstract: ABSTRACT

Cited by 18 publications

References 15 publications

Biomass retention on electrodes rather than electrical current enhances stability in anaerobic digestion

Biomass retention on electrodes rather than electrical current enhances stability in anaerobic digestion

Monitoramento da salinidade de águas subterrâneas em várzea cultivada com cana-de-açúcar fertirrigada com vinhaça

Diversidad bacteriana asociada a biopelículas anódicas en celdas de combustible microbianas alimentadas con aguas residuales.

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