Filamentous bacteria existence in aerobic granular reactors

Figueroa, M.; Río, Ángeles Val del; Campos, José Luis; Méndez, R.; Mosquera-Corral, Anuska

doi:10.1007/s00449-014-1327-x

Cited by 57 publications

(14 citation statements)

References 36 publications

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“…A fast decrease of the abundance of filamentous‐shape organisms occurred when the settling time of the SBR operational cycle was shortened and they were washed‐out. Even though in previous studies filamentous bacteria showed a structural function in the stability of aerobic granules, microbial results of the present study suggested that heterotrophic bacteria acquired the role of binding material, as it will be discussed in the following section.…”

Section: Resultscontrasting

confidence: 51%

Bacterial community dynamics in long‐term operation of a pilot plant using aerobic granular sludge to treat pig slurry

Fra-Vázquez

Morales

Figueroa

et al. 2016

Biotechnology Progress

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Aerobic granular sludge represents an interesting approach for simultaneous organic matter and nitrogen removal in wastewater treatment plants. However, the information about microbial communities in aerobic granular systems dealing with industrial wastewater like pig slurry is limited. Herein, bacterial diversity and dynamics were assessed in a pilot scale plant using aerobic granular sludge for organic matter and nitrogen elimination from swine slurry during more than 300 days. Results indicated that bacterial composition evolved throughout the operational period from flocculent activated sludge, used as inoculum, to mature aerobic granules. Bacterial diversity increased at the beginning of the granulation process and then declined due to the application of transient organic matter and nitrogen loads. The operational conditions of the pilot plant and the degree of granulation determined the microbial community of the aerobic granules. Brachymonas, Zoogloea and Thauera were attributed with structural function as they are able to produce extracellular polymeric substances to maintain the granular structure. Nitrogen removal was justified by partial nitrification (Nitrosomonas) and denitrification (Thauera and Zoogloea), while Comamonas was identified as the main organic matter oxidizing bacteria. Overall, clear links between bacterial dynamics and composition with process performance were found and will help to predict their biological functions in wastewater ecosystems improving the future control of the process. © 2016 American Institute of Chemical Engineers Biotechnol. Prog., 32:1212-1221, 2016.

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Section: Resultscontrasting

confidence: 51%

Bacterial community dynamics in long‐term operation of a pilot plant using aerobic granular sludge to treat pig slurry

Fra-Vázquez

Morales

Figueroa

et al. 2016

Biotechnology Progress

Self Cite

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“…These four genera have earlier been reported in different granular sludge reactors operated for organic carbon and nitrogen removal (Li et al, 2008; Ebrahimi et al, 2010; Liu et al, 2010; Zhao et al, 2013, 2015; Kong et al, 2014; Lv et al, 2014; Cydzik-Kwiatkowska, 2015; Figueroa et al, 2015). Thauera and Zoogloea have been found at both low and high OLRs, between 1 and 15 kg COD m -3 d -1 (Ebrahimi et al, 2010; Zhao et al, 2013; Lv et al, 2014).…”

Section: Resultsmentioning

confidence: 58%

“…Thauera and Zoogloea have been found at both low and high OLRs, between 1 and 15 kg COD m -3 d -1 (Ebrahimi et al, 2010; Zhao et al, 2013; Lv et al, 2014). Meganema has been found to be abundant in reactors operated at 1.5–3 kg COD m -3 d -1 , treating industrial or synthetic wastewater (Kong et al, 2014; Figueroa et al, 2015). Paracoccus has been reported at loading rates of 1.5–3.3 kg COD m -3 d -1 , in reactors treating synthetic wastewater, and in wastewater polluted with pharmaceuticals (Lv et al, 2014; Cydzik-Kwiatkowska, 2015; Zhao et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Microbial Population Dynamics and Ecosystem Functions of Anoxic/Aerobic Granular Sludge in Sequencing Batch Reactors Operated at Different Organic Loading Rates

et al. 2017

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The granular sludge process is an effective, low-footprint alternative to conventional activated sludge wastewater treatment. The architecture of the microbial granules allows the co-existence of different functional groups, e.g., nitrifying and denitrifying communities, which permits compact reactor design. However, little is known about the factors influencing community assembly in granular sludge, such as the effects of reactor operation strategies and influent wastewater composition. Here, we analyze the development of the microbiomes in parallel laboratory-scale anoxic/aerobic granular sludge reactors operated at low (0.9 kg m −3 d −1 ), moderate (1.9 kg m −3 d −1 ) and high (3.7 kg m −3 d −1 ) organic loading rates (OLRs) and the same ammonium loading rate (0.2 kg NH 4 -N m −3 d −1 ) for 84 days. Complete removal of organic carbon and ammonium was achieved in all three reactors after start-up, while the nitrogen removal (denitrification) efficiency increased with the OLR: 0% at low, 38% at moderate, and 66% at high loading rate. The bacterial communities at different loading rates diverged rapidly after start-up and showed less than 50% similarity after 6 days, and below 40% similarity after 84 days. The three reactor microbiomes were dominated by different genera (mainly Meganema, Thauera, Paracoccus, and Zoogloea), but these genera have similar ecosystem functions of EPS production, denitrification and polyhydroxyalkanoate (PHA) storage. Many less abundant but persistent taxa were also detected within these functional groups. The bacterial communities were functionally redundant irrespective of the loading rate applied. At steady-state reactor operation, the identity of the core community members was rather stable, but their relative abundances changed considerably over time. Furthermore, nitrifying bacteria were low in relative abundance and diversity in all reactors, despite their large contribution to nitrogen turnover. The results suggest that the OLR has considerable impact on the composition of the granular sludge communities, but also that the granule communities can be dynamic even at steady-state reactor operation due to high functional redundancy of several key guilds. Knowledge about microbial diversity with specific functional guilds under Granular Microbiome at Different Organic Loads different operating conditions can be important for engineers to predict the stability of reactor functions during the start-up and continued reactor operation.

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“…Previous studies suggested that the presence of X S in the wastewater results in aerobic granules with filamentous outgrowths on their surfaces (Schwarzenbeck et al, 2004(Schwarzenbeck et al, , 2005De Kreuk et al, 2010;Peyong et al, 2012;Figueroa et al, 2015). The development of filamentous and finger-type structures can be explained by the existence of substrate gradients inside the sludge aggregates due to diffusion limitation (Martins et al, 2004;De Kreuk et al, 2010;Weissbrodt et al, 2012).…”

Section: Introductionmentioning

confidence: 96%

Effect of particulate organic substrate on aerobic granulation and operating conditions of sequencing batch reactors

et al. 2015

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Filamentous bacteria existence in aerobic granular reactors

Cited by 57 publications

References 36 publications

Bacterial community dynamics in long‐term operation of a pilot plant using aerobic granular sludge to treat pig slurry

Bacterial community dynamics in long‐term operation of a pilot plant using aerobic granular sludge to treat pig slurry

Microbial Population Dynamics and Ecosystem Functions of Anoxic/Aerobic Granular Sludge in Sequencing Batch Reactors Operated at Different Organic Loading Rates

Effect of particulate organic substrate on aerobic granulation and operating conditions of sequencing batch reactors

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