Granulation of activated sludge under low hydrodynamic shear and different wastewater characteristics

Devlin, Tanner R.; Biase, Alessandro di; Kowalski, Maciej S.; Oleszkiewicz, Jan A.

doi:10.1016/j.biortech.2016.11.005

Cited by 68 publications

(25 citation statements)

References 14 publications

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“…More recent research show that granules form at superficial air velocities of 0.8 cm s −1 but with more porous and unstable structure (Lochmatter and Holliger 2014 ). Granules were also formed at velocities as low as 0.42 cm s −1 during low strength (300 mg COD L −1 ) wastewater treatment, but not with medium or high strength wastewaters (600 or 1200 mg COD L −1 ) (Devlin et al 2017 ). He et al ( 2017 ) operated a system for simultaneous nitrogen and phosphorous removal at even lower superficial gas velocities, ranging from 0.04 to 0.17 cm s −1 , at an OLR of 0.3 kg COD m −3 day −1 .…”

Section: Process Configurations and Operational Conditions Affecting mentioning

confidence: 99%

“…Successful granulation has been obtained in SBRs with completely stirred tank configuration due to growth of PAOs and GAOs, but it took three times longer for the granules to form compared to in bubble columns (Weissbrodt et al 2013a ). Devlin et al ( 2017 ) proposed that granulation is dependent on various parameters that selects out fast growing aerobic microorganisms; at higher OLR, more shear is needed to shear off the fast growing microorganisms at the surface, whereas at low OLR, less shear is required. Hence, they concluded that shear force is not a requirement for granules to form but shear mitigates surface fouling when organic loads exceed the capacity for anaerobic uptake.…”

Section: Process Configurations and Operational Conditions Affecting mentioning

confidence: 99%

“…Low ORL (1.5 kg m −3 day −1 ) has been found to give smaller and more compact granules than at higher ORL (3–4.5 kg m −3 day −1 ) (Li et al 2008 ). For granules to be stable at high OLRs, Devlin et al ( 2017 ) proposed that by increasing the shear, by increasing the upflow air superficial velocity in the reactor, surface outgrowth of the granules caused by rapidly growing aerobic microorganisms could be reduced giving a more stable granulation.…”

Section: Optimization Of the Ags Process And Influence On Effluent Qumentioning

confidence: 99%

See 2 more Smart Citations

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

156

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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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Section: Process Configurations and Operational Conditions Affecting mentioning

confidence: 99%

Section: Process Configurations and Operational Conditions Affecting mentioning

confidence: 99%

Section: Optimization Of the Ags Process And Influence On Effluent Qumentioning

confidence: 99%

See 1 more Smart Citation

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

156

View full text Add to dashboard Cite

show abstract

“…In the present study, the reason why a change in granular morphology was observed lies in the microbiology of different microorganisms forming granules, EPS production/accumulation, and cycle length. The ordinary heterotrophs (OHO) are fast growing microorganisms that reside on the surface of the granules and therefore mainly drive its structural appearance (Devlin et al, 2017). At high OLR and F/M ratio, the OHO had more substrate availability for growth and more EPS are stored within and on the granular surface, which led to an amorphous superficial architecture.…”

Section: Granular Sludge Morphologymentioning

confidence: 99%

Aerobic granular sludge treating anaerobically pretreated brewery wastewater at different loading rates

Biase

Corsino

Devlin

et al. 2020

Water Science and Technology

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In this study, three different aerobic granular sludge (AGS) reactors fed with anaerobically pre-treated brewery wastewater were studied. The AGS reactors were operated under different conditions including organic loading rates (OLR) between 0.8 and 4.1 kg COD m−3 d−1, C:N:P ratios (100:10:1 and 100:6:1) and food to microorganism ratios (F/M) between 0.8 ± 0.6 and 1.2 ± 0.5 and 0.9 ± 0.3 kg-TCOD kg-VSS−1d−1. Stable granulation was achieved within two weeks and the size of the granules increased according to the OLR applied. The results indicated that low C:N:P and F/M ratios were favorable to achieve stable aerobic granules in the long term. The carbon removal rate was load-independent in the range examined (TCOD removal >80%), whereas TN removals were inversely proportional to the OLRs. Overall, a longer aeration reaction time with a lower OLR was beneficial to granular structure which exhibited a compact and defined architecture. Performance results within the other conditions studied further indicated that microbial community and its complex functionality in nutrient removal was efficient at operational parameters of OLR at 0.8 ± 0.2 kg-TCOD m−3d−1 and F/M ratio at 0.5 ± 0.2 kg-TCOD VSS−1d−1. Moreover, the protein to polysaccharide ratio increased as OLR decreased, leading to a stable granular structure.

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“…Moreover, due to the higher value of the sludge retention time (SRT), low waste-sludge production could be achieved. Indeed, the selection of slow growing microorganisms promotes low sludge yields (Troiani et al, 2011;Devlin et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous sludge minimization, biological phosphorous removal and membrane fouling mitigation in a novel plant layout for MBR

Corsino

Oliveira

Trapani

et al. 2020

Journal of Environmental Management

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The integration of one anaerobic reactor in the mainstream (AMSR) of a pre-denitritication-MBR was evaluated with the aim to achieve simultaneous sludge minimization and phosphorous removal. The excess sludge production was reduced by 64% when the AMSR was operated under 8h of hydraulic retention time (HRT). The highest nutrients removal performances referred to organic carbon (98%), nitrogen (90%) and phosphorous (97%) were obtained under 8 h of HRT. In contrast, prolonged anaerobic-endogenous conditions were found to be detrimental for all nutrients removal performances. Similarly, the lowest membrane fouling tendency (FR=0.65•10 11 m-1 d-1) was achieved under 8 h of HRT, whereas it significantly increased under higher HRT. The highest polyphosphate accumulating organisms kinetics were achieved under HRT of 8 h, showing very high exogenous Prelease (46.67 mgPO4-P gVSS-1 h-1) and P-uptake rates (48.6 mgPO4-P gVSS-1 h-1), as well as a not negligible P-release rate under endogenous conditions at low COD/P ratio (≈ 1).

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Granulation of activated sludge under low hydrodynamic shear and different wastewater characteristics

Cited by 68 publications

References 14 publications

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

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

Aerobic granular sludge treating anaerobically pretreated brewery wastewater at different loading rates

Simultaneous sludge minimization, biological phosphorous removal and membrane fouling mitigation in a novel plant layout for MBR

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