Fate of aerobic granular sludge in the long-term: The role of EPSs on the clogging of granular sludge porosity

Corsino, Santo Fabio; Capodici, Marco; Torregrossa, Michele; Viviani, Gaspare

doi:10.1016/j.jenvman.2016.09.004

Cited by 54 publications

(21 citation statements)

References 32 publications

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“…Oxygen was provided to the reactors through a fine bubble diffuser placed at the bottom of each reactor with an air flow rate of 3 L min -1 , corresponding to up-flow air velocity of 2.4 cm s -1 . The latter values were in good agreement with previous experiments on AGS [27,28]. The AGSBRs effluent was stored in a tank that served as balancing volume between the discontinuous flow regime of the AGSBRs and the continuous flow of the MBR.…”

Section: Mbr and Ags+mbr Plant Configurationsupporting

confidence: 89%

Treatment of high strength industrial wastewater with membrane bioreactors for water reuse: Effect of pre-treatment with aerobic granular sludge on system performance and fouling tendency

Trapani

Corsino

Torregrossa

et al. 2019

Journal of Water Process Engineering

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In this study, the treatment of citrus wastewater with membrane bioreactors (MBRs) under different configurations was investigated for water reuse. In particular, one MBR and one aerobic granular sludge MBR (AGS+MBR) bench scale plants were operated for 60 days. The experimental campaign was divided into two periods. In Phase I, a conventional hollow fiber MBR was employed for the treatment of the raw high strength wastewater, whereas in Phase II a combination of in-series reactors (AGS plus MBR) was adopted for the treatment of the high strength citrus wastewater The results demonstrated that both plant configurations enabled very high COD removal, with average values close to 99%. Respirometric batch tests revealed a considerable high metabolic activity of the biomass in both plant configurations, with higher values in the AGS+MBR. It was speculated that the MBR reactor enriched in active biomass deriving from the erosion of the external granule layers in the upstream reactor. In terms of fouling tendency, higher resistance to filtration was observed in the AGS+MBR plant, also characterized by higher irremovable resistance increase compared to the MBR plant that might severely affect the membrane service life.

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Section: Mbr and Ags+mbr Plant Configurationsupporting

confidence: 89%

Treatment of high strength industrial wastewater with membrane bioreactors for water reuse: Effect of pre-treatment with aerobic granular sludge on system performance and fouling tendency

Trapani

Corsino

Torregrossa

et al. 2019

Journal of Water Process Engineering

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“…The aerobic granular sludge (AGS) systems are a promising technology to replace AS systems due to the smaller footprint and the possibility to remove organic matter and nutrients (N and P) simultaneously in the same reactor [4,5]. In this sense, AGS systems have already been used to treat different troublesome wastewaters including from the pulp and paper industry, petrochemical, hypersaline, oily and sulfur-laden effluents, and applied in heavy metals removal, among others [6][7][8][9][10]. However, the performance and stability of the biomass aggregates is related to their structure and settling ability [11,12], and it is known that changes in the granules size can occur due to unstable process conditions [13].…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, the application of QIA can be a useful tool to characterize, for example, the start-up of AGS systems and the structure of mature AGS, as well as to monitor the balance between suspended and granular fractions. Taking this into consideration, the main objective of this work is to present a QIA based methodology to characterize the structure of suspended and granular fractions of mature AGS [6], and predict their settling ability using multilinear regression (MLR) methods.…”

Section: Introductionmentioning

confidence: 99%

Sludge volume index and suspended solids estimation of mature aerobic granular sludge by quantitative image analysis and chemometric tools

Leal

Río

Mesquita

et al. 2020

Separation and Purification Technology

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Aerobic granular sludge (AGS) is considered a promising technology for wastewater treatment. Furthermore, it is recognized that the stability of the process is related to the balanced growth of the suspended (floccular) and granular fractions. Therefore, the development of adequate techniques to monitor this balance is of interest. In this work the sludge volume index (SVI), volatile suspended solids (VSS) and total suspended solids (TSS) of mature AGS were successfully predicted with multilinear regression (MLR) models using data obtained from quantitative image analysis (QIA) of both fractions (suspended and granular). Relevant predictions were obtained for the SVI (R 2 of 0.975), granules TSS (R 2 of 0.985), flocs TSS (R 2 of 0.971), granules VSS (R 2 of 0.984) and flocs VSS (R 2 of 0.986). The estimation of the granular fraction ratio from the predicted TSS and VSS was also successful (R 2 of 0.985). The predictions help to avoid instability episodes of the AGS system, such as changes in biomass morphology, structure and settling properties.

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“…In Period I, 60% of the cycle was occupied by feast phase and this explains an improper feast/famine balance leading to unstable granular structure. Therefore, the famine phase was not long enough to support the granular structure over filamentous microorganisms development causing the progressive deterioration of the spherical shape(Corsino et al, 2016b).…”

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Effect of extended famine conditions on aerobic granular sludge stability in the treatment of brewery wastewater

Corsino

Biase

Devlin

et al. 2017

Bioresource Technology

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Results obtained from three aerobic granular sludge reactors treating brewery wastewater are presented. Reactors were operated for 60d days in each of the two periods under different cycle duration: (Period I) short 6h cycle, and (Period II) long 12h cycle. Organic loading rates (OLR) varying from 0.7kgCODmd to 4.1kgCODmd were tested. During Period I, granules successfully developed in all reactors, however, results revealed that the feast and famine periods were not balanced and the granular structure deteriorated and became irregular. During Period II at decreased 12h cycle time, granules were observed to develop again with superior structural stability compared to the short 6h cycle time, suggesting that a longer starvation phase enhanced production of proteinaceous EPS. Overall, the extended famine conditions encouraged granule stability, likely because long starvation period favours bacteria capable of storage of energy compounds.

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Fate of aerobic granular sludge in the long-term: The role of EPSs on the clogging of granular sludge porosity

Cited by 54 publications

References 32 publications

Treatment of high strength industrial wastewater with membrane bioreactors for water reuse: Effect of pre-treatment with aerobic granular sludge on system performance and fouling tendency

Treatment of high strength industrial wastewater with membrane bioreactors for water reuse: Effect of pre-treatment with aerobic granular sludge on system performance and fouling tendency

Sludge volume index and suspended solids estimation of mature aerobic granular sludge by quantitative image analysis and chemometric tools

Effect of extended famine conditions on aerobic granular sludge stability in the treatment of brewery wastewater

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