Bacterial Alginate Role in Aerobic Granular Bio‐particles Formation and Settleability Improvement

Lin, Yuemei; Wang, L.; M., Z.; Liu, X. Y.

doi:10.1080/01496390801973805

Cited by 49 publications

(24 citation statements)

References 9 publications

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“…This exopolysaccharide is thought to have a protective function in a harsh environment in which microorganisms are continually subjected to oxidative stress [94]. Moreover, Lin et al [95] reported that bacterial alginate greatly improved the formation and settleability of the aerobic granular bioparticles in the AS. In another study, Matz et al [96] documented that the production of alginate by P. aeruginosa induced the formation of microcolonies that protected against protozoa.…”

Section: Discussionmentioning

confidence: 99%

Selecting Bacteria Candidates for the Bioaugmentation of Activated Sludge to Improve the Aerobic Treatment of Landfill Leachate

Michalska

Piński

Żur

et al. 2020

Water

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In this study, a multifaceted approach for selecting the suitable candidates for bioaugmentation of activated sludge (AS) that supports leachate treatment was used. To determine the exploitation of 10 bacterial strains isolated from the various matrices for inoculating the AS contaminated with the Kalina pond leachate (KPL), their degradative potential was analyzed along with their aptitude to synthesize compounds improving remediation of pollutants in wastewater and ability to incorporate into the AS flocs. Based on their capability to degrade aromatic compounds (primarily catechol, phenol, and cresols) at a concentration of 1 mg/mL and survive in 12.5% of the KPL, Pseudomonas putida OR45a and P. putida KB3 can be considered to be the best candidates for bioaugmentation of the AS among all of the bacteria tested. Genomic analyses of these two strains revealed the presence of the genes encoding enzymes related to the metabolism of aromatic compounds. Additionally, both microorganisms exhibited a high hydrophobic propensity (above 50%) and an ability to produce biosurfactants as well as high resistance to ammonium (above 600 µg/mL) and heavy metals (especially chromium). These properties enable the exploitation of both bacterial strains in the bioremediation of the AS contaminated with the KPL.

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Section: Discussionmentioning

confidence: 99%

Selecting Bacteria Candidates for the Bioaugmentation of Activated Sludge to Improve the Aerobic Treatment of Landfill Leachate

Michalska

Piński

Żur

et al. 2020

Water

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“…Granules can therefore be considered as exopolysaccharide-based ecosystems of bacterial producers and consumers. Seviour et al (2011, 2012) have isolated a specific exopolysaccharide (granulan) from GAO-dominated granules, whereas Lin et al (2008, 2010) have highlighted alginate as key granular exopolymer. The here applied in situ assessment of specific glycoconjugates by FLBA can inform on the type of abundant sugar residues (Zippel and Neu, 2011) present in the granules examined.…”

Section: Discussionmentioning

confidence: 99%

Assessment of bacterial and structural dynamics in aerobic granular biofilms

Weissbrodt¹,

Neu²,

Kuhlicke³

et al. 2013

Front. Microbiol.

126

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Aerobic granular sludge (AGS) is based on self-granulated flocs forming mobile biofilms with a gel-like consistence. Bacterial and structural dynamics from flocs to granules were followed in anaerobic-aerobic sequencing batch reactors (SBR) fed with synthetic wastewater, namely a bubble column (BC-SBR) operated under wash-out conditions for fast granulation, and two stirred-tank enrichments of Accumulibacter (PAO-SBR) and Competibacter (GAO-SBR) operated at steady-state. In the BC-SBR, granules formed within 2 weeks by swelling of Zoogloea colonies around flocs, developing subsequently smooth zoogloeal biofilms. However, Zoogloea predominance (37–79%) led to deteriorated nutrient removal during the first months of reactor operation. Upon maturation, improved nitrification (80–100%), nitrogen removal (43–83%), and high but unstable dephosphatation (75–100%) were obtained. Proliferation of dense clusters of nitrifiers, Accumulibacter, and Competibacter from granule cores outwards resulted in heterogeneous bioaggregates, inside which only low abundance Zoogloea (<5%) were detected in biofilm interstices. The presence of different extracellular glycoconjugates detected by fluorescence lectin-binding analysis showed the complex nature of the intracellular matrix of these granules. In the PAO-SBR, granulation occurred within two months with abundant and active Accumulibacter populations (56 ± 10%) that were selected under full anaerobic uptake of volatile fatty acids and that aggregated as dense clusters within heterogeneous granules. Flocs self-granulated in the GAO-SBR after 480 days during a period of over-aeration caused by biofilm growth on the oxygen sensor. Granules were dominated by heterogeneous clusters of Competibacter (37 ± 11%). Zoogloea were never abundant in biomass of both PAO- and GAO-SBRs. This study showed that Zoogloea, Accumulibacter, and Competibacter affiliates can form granules, and that the granulation mechanisms rely on the dominant population involved.

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“…The exopolysaccharide content of wastewater sludge supernatant is recognized to be a key to the formation of aerobic granules [8,9] and alginate-like exopolysaccharides (ALE) have recently been extracted from laboratory [10] and pilot-scale [11] reactors. This ALE has been shown to contain a high percentage of poly-guluronic acid (G) blocks that are also capable of forming rigid and non-deformable gels when linked by calcium cations.…”

Section: Introductionmentioning

confidence: 99%

Calcium-mediated polysaccharide gel formation and breakage: Impact on membrane foulant hydraulic properties

Xin

Bligh

Kinsela

et al. 2015

Journal of Membrane Science

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Bacterial Alginate Role in Aerobic Granular Bio‐particles Formation and Settleability Improvement

Cited by 49 publications

References 9 publications

Selecting Bacteria Candidates for the Bioaugmentation of Activated Sludge to Improve the Aerobic Treatment of Landfill Leachate

Selecting Bacteria Candidates for the Bioaugmentation of Activated Sludge to Improve the Aerobic Treatment of Landfill Leachate

Assessment of bacterial and structural dynamics in aerobic granular biofilms

Calcium-mediated polysaccharide gel formation and breakage: Impact on membrane foulant hydraulic properties

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