Quantification of the shear stresses in a microbial granular sludge reactor

Ren, Tingting; Mu, Yang; Liu, Li; Li, Xiaoyan; Yu, Han‐Qing

doi:10.1016/j.watres.2009.07.019

Cited by 40 publications

(11 citation statements)

References 32 publications

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“…The 23% hydrophobicity increase of the superstratum granules on the other hand was conducive to biomass separation from the effluent. The hydrophobicity variation of the granular sludge was not only dictated by the bacterial community and surface extracellular polymeric substances (EPS) content, but also influenced by the aqueous chemical composition and hydraulic conditions 35 , which are further investigated below.…”

Section: Resultsmentioning

confidence: 99%

Example study for granular bioreactor stratification: Three-dimensional evaluation of a sulfate-reducing granular bioreactor

Hao

Luo

et al. 2016

Sci Rep

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Recently, sulfate-reducing granular sludge has been developed for application in sulfate-laden water and wastewater treatment. However, little is known about biomass stratification and its effects on the bioprocesses inside the granular bioreactor. A comprehensive investigation followed by a verification trial was therefore conducted in the present work. The investigation focused on the performance of each sludge layer, the internal hydrodynamics and microbial community structures along the height of the reactor. The reactor substratum (the section below baffle 1) was identified as the main acidification zone based on microbial analysis and reactor performance. Two baffle installations increased mixing intensity but at the same time introduced dead zones. Computational fluid dynamics simulation was employed to visualize the internal hydrodynamics. The 16S rRNA gene of the organisms further revealed that more diverse communities of sulfate-reducing bacteria (SRB) and acidogens were detected in the reactor substratum than in the superstratum (the section above baffle 1). The findings of this study shed light on biomass stratification in an SRB granular bioreactor to aid in the design and optimization of such reactors.

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Section: Resultsmentioning

confidence: 99%

Example study for granular bioreactor stratification: Three-dimensional evaluation of a sulfate-reducing granular bioreactor

Hao

Luo

et al. 2016

Sci Rep

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“…Granulation can be achieved through the selective discharge of small and slowsettling sludge flocs (Li and Li 2009;Ren et al 2009;Sheng et al 2010). In comparison with the strategy of enhanced sludge washout (de Kreuk and van Loosdrecht, 2004;Tay et al 2005), the method used in the present study with a controlled sludge discharge ratio at 10% led to slower granule formation.…”

Section: Effect Of Gs Cellular Substances On the Bacterial Granulatiomentioning

confidence: 86%

The quorum-sensing effect of aerobic granules on bacterial adhesion, biofilm formation, and sludge granulation

Ren

2010

Appl Microbiol Biotechnol

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Quorum sensing (QS) through signal chemical molecules is known to be essential to bacterial adhesion and biofilm formation. In this study, the QS ability of aerobic granules--a special form of biofilms used for biological wastewater treatment--was investigated and compared with that of conventional activated sludge flocs. A novel sectional membrane bioreactor was used together with a flow-cell to evaluate the possible influence of signal chemicals produced by the source sludge on the growth mode of bacterial cells. The results demonstrate the apparent production of QS chemicals from granules and its impact on initial cell attachment and granule formation. When granules were used as the signal-producing biomass, the attached-growth mode was dominant for the free cells, and the biofilm formation rate in the flow-cell was about ten times faster than in cases which used activated sludge as the signal source biomass. In addition, the intracellular extract from mature granules significantly accelerated the sludge granulation process. It is argued that the production and expression of QS signal chemicals from granules and granule precursors might have induced the gene expression of bacteria in suspension for attached growth rather than suspended growth, leading to granule formation and its stable structure.

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“…In the SRUSB, interior turbulence was maintained by the internal recirculation and the influent flow. This hydrodynamic force plays a similar role as the gas bubbles creating turbulence for particle collisions and the detachment of granular sludge for subsequent self-renewal (Ren et al, 2009). …”

Section: 2mentioning

confidence: 99%

Physicochemical and biological characterization of long-term operated sulfate reducing granular sludge in the SANI® process

Hao

Luo

et al. 2015

Water Research

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Quantification of the shear stresses in a microbial granular sludge reactor

Cited by 40 publications

References 32 publications

Example study for granular bioreactor stratification: Three-dimensional evaluation of a sulfate-reducing granular bioreactor

Example study for granular bioreactor stratification: Three-dimensional evaluation of a sulfate-reducing granular bioreactor

The quorum-sensing effect of aerobic granules on bacterial adhesion, biofilm formation, and sludge granulation

Physicochemical and biological characterization of long-term operated sulfate reducing granular sludge in the SANI® process

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