Partial nitrification using aerobic granule continuous-flow reactor: Operations and microbial community

Wan, Chunli; Yang, Xue; Lee, Dong Hoon; Liu, Xiang; Sun, Supu

doi:10.1016/j.jtice.2014.08.009

Cited by 21 publications

(9 citation statements)

References 28 publications

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“…However, the EPS extracted from the AerAOB-enriched culture had a greater content of polysaccharides than proteins. This result is in good agreement with previous studies based on nitritation reactors (Jemaat et al, 2014;Wan et al, 2014), e.g., Jemaat et al (2014) found polysaccharides was the dominant EPS fraction in the AerAOB-enriched granules, with polysaccharide/protein ratios always higher than 2. Therefore, we can conclude that the key constituent in the AnAOB EPS could be proteins, which is likely responsible for the formation of AnAOB aggregates; in contrast, the polysaccharide fraction could be an important factor in the AerAOB aggregates.…”

Section: Chemical Compositions Of Eps From the Mixed Culturessupporting

confidence: 93%

Spectroscopic characterization of extracellular polymeric substances from a mixed culture dominated by ammonia-oxidizing bacteria

2015

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Section: Chemical Compositions Of Eps From the Mixed Culturessupporting

confidence: 93%

Spectroscopic characterization of extracellular polymeric substances from a mixed culture dominated by ammonia-oxidizing bacteria

2015

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“…Predatory bacteria feed on other microbial cells and they have been found in a variety of environments (Martin 2002 ). The presence of predatory bacteria in aerobic granules and its persistence during granulation has been reported (Li et al 2014d ; Szabó et al 2017a ; Wan et al 2014 ; Weissbrodt et al 2014 ). Predatory bacteria and their effect on microbial populations is, however, poorly understood.…”

Section: Sludge Granulationmentioning

confidence: 96%

The mechanisms of granulation of activated sludge in wastewater treatment, its optimization, and impact on effluent quality

Wilén

Liébana

Persson

et al. 2018

Appl Microbiol Biotechnol

164

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Granular activated sludge has gained increasing interest due to its potential in treating wastewater in a compact and efficient way. It is well-established that activated sludge can form granules under certain environmental conditions such as batch-wise operation with feast-famine feeding, high hydrodynamic shear forces, and short settling time which select for dense microbial aggregates. Aerobic granules with stable structure and functionality have been obtained with a range of different wastewaters seeded with different sources of sludge at different operational conditions, but the microbial communities developed differed substantially. In spite of this, granule instability occurs. In this review, the available literature on the mechanisms involved in granulation and how it affects the effluent quality is assessed with special attention given to the microbial interactions involved. To be able to optimize the process further, more knowledge is needed regarding the influence of microbial communities and their metabolism on granule stability and functionality. Studies performed at conditions similar to full-scale such as fluctuation in organic loading rate, hydrodynamic conditions, temperature, incoming particles, and feed water microorganisms need further investigations.

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“…These substrates can be found in the core of the granule. The presence of predatory bacteria like Bdellovibrio has been reported earlier in granular sludge (Wan et al 2014 ; Weissbrodt et al 2014 ; Li et al 2014 ), but the effect of predation on the ecosystem is not yet fully understood. Despite being obligate aerobes (Rosenberg et al 2014 ), Bdellovibrio spp.…”

Section: Discussionmentioning

confidence: 90%

Comparison of the bacterial community composition in the granular and the suspended phase of sequencing batch reactors

et al. 2017

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Granulation of activated sludge is an increasingly important area within the field of wastewater treatment. Granulation is usually achieved by high hydraulic selection pressure, which results in the wash-out of slow settling particles. The effect of the harsh wash-out conditions on the granular sludge ecosystem is not yet fully understood, but different bacterial groups may be affected to varying degrees. In this study, we used high-throughput amplicon sequencing to follow the community composition in granular sludge reactors for 12 weeks, both in the granular phase and the suspended phase (effluent). The microbiome of the washed out biomass was similar but not identical to the microbiome of the granular biomass. Certain taxa (e.g. Flavobacterium spp. and Bdellovibrio spp.) had significantly (p < 0.05) higher relative abundance in the granules compared to the effluent. Fluorescence in situ hybridization images indicated that these taxa were mainly located in the interior of granules and therefore protected from erosion. Other taxa (e.g. Meganema sp. and Zooglea sp.) had significantly lower relative abundance in the granules compared to the effluent, and appeared to be mainly located on the surface of granules and therefore subject to erosion. Despite being washed out, these taxa were among the most abundant members of the granular sludge communities and were likely growing fast in the reactors. The ratio between relative abundance in the granular biomass and in the effluent did not predict temporal variation of the taxa in the reactors, but it did appear to predict the spatial location of the taxa in the granules.Electronic supplementary materialThe online version of this article (doi:10.1186/s13568-017-0471-5) contains supplementary material, which is available to authorized users.

show abstract

Partial nitrification using aerobic granule continuous-flow reactor: Operations and microbial community

Cited by 21 publications

References 28 publications

Spectroscopic characterization of extracellular polymeric substances from a mixed culture dominated by ammonia-oxidizing bacteria

Spectroscopic characterization of extracellular polymeric substances from a mixed culture dominated by ammonia-oxidizing bacteria

The mechanisms of granulation of activated sludge in wastewater treatment, its optimization, and impact on effluent quality

Comparison of the bacterial community composition in the granular and the suspended phase of sequencing batch reactors

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