Determining the mechanisms for aerobic granulation from mixed seed of floccular and crushed granules in activated sludge wastewater treatment

Verawaty, Marieska; Pijuan, Maite; Yuan, Zhiguo; Bond, Philip L.

doi:10.1016/j.watres.2011.11.054

Cited by 112 publications

(43 citation statements)

References 42 publications

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“…During the adaptation period of the system, the concentration of MLSS in the reactors decreased by 46% and 43%, whereas the concentration of MLVSS decreased by 44.5% and 22%. After 5 days, the MLSS values in R2 increased and the average value of this parameter was 5.24±0.78 g/dm 3 . The results showed in Fig.…”

Section: Resultsmentioning

confidence: 94%

“…A short settling time adopted in the study encouraged the wash out of the biomass from the reactors. The initial MLSS concentration (after the inoculation of the reactors) in both reactors was 3.90 g/dm 3 and after the application of powdered keramsite to reactor R2, the value increased to 7.38 g/dm 3 . During the adaptation period of the system, the concentration of MLSS in the reactors decreased by 46% and 43%, whereas the concentration of MLVSS decreased by 44.5% and 22%.…”

Section: Resultsmentioning

confidence: 95%

“…The material that was used in the study had a specific surface area of 5.183 m 2 /g, an apparent density of 2.6182 g/cm 3 and a settling velocity of particles varying in size from 100 to 200 μm of approx. 9.0 m/h.…”

Section: Methodsmentioning

confidence: 99%

“…Based on the available literature, it was stated that so far, the research has been carried out with the use of: chemical coagulants [1], dosage of granules fragments [2,3], powdered sewage sludge [4] and powdered materials [5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…The application of these materials has an influence on the density of granules as well. Wei et al [10] observed that the density of granules for a reactor with powdered activated carbon was 1.070 g/cm 3 , while for a reference system without the powdered material, it was approximately 1.025 g/cm 3 . What is more, after fifty days of operation, granules in the reference reactor broke up.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Powdered keramsite as unconventional method of AGS technology support in GSBR reactor with minimum-optimum OLR

2018

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Abstract. Aerobic Granular Sludge (AGS) technology becomes a very competitive method to activated sludge system. Its main advantages include: high energy efficiency and low investment costs. Despite this fact, intensive research on biogranulation optimization are still carried out, both at laboratory and technical scale. In order to intensify the AGS technology, new methods of biogranulation and ways of improving the stability of aerobic granules are sought. So far, several studies have been conducted in this area, with using among others: chemical coagulants, dosage fragments of granules and powdered materials. The aim of this study was to evaluate the impact of powdered keramsite on the feasibility of rapid aerobic granulation in a GSBR reactor with a minimum-optimum organic loading rate (OLR). The research presents an effective way of cultivating stable aerobic granules in a Granular Sequencing Batch Reactor (GSBR) under specific technological parameters.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Powdered keramsite as unconventional method of AGS technology support in GSBR reactor with minimum-optimum OLR

2018

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Modeling and optimization of granulation process of activated sludge in sequencing batch reactors

2013

Biotech & Bioengineering

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Aerobic granulation is a promising process for wastewater treatment, but this granulation process is very complicated and is affected by many factors. Thus, a mathematical model to quantitatively describe such a granulation process is highly desired. In this work, by taking into account all of key steps including biomass growth, increase in particle size and density, detachment, breakage and sedimentation, an one-dimensional mathematic model was developed to simulate the granulation process of activated sludge in a sequencing batch reactor (SBR). Discretization methodology was applied by dividing operational time, sedimentation process, size fractions and slices into discretized calculation elements. Model verification and prediction for aerobic granulation process were conducted under four different conditions. Four parameters indicative of granulation progression, including mean radius, biomass discharge ratio, total number, and bioparticle size distribution, were predicted well with the model. An optimum controlling strategy, automatically adjusted of settling time, was also proposed based on this model. Moreover, aerobic granules with a density higher than 120 g VSS/L and radius in a range of 0.4-1.0 mm were predicted to have both high settling velocity and substrate utilization rate, and the corresponding optimum operating conditions were be determined. Experimental results demonstrate that the developed model is appropriate for simulating the formation of aerobic granules in SBRs. These results are useful for designing and optimizing the cultivation and operation of aerobic granule process.

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Quorum sensing unveils the sludge floccule‐assisted stabilization of aerobic granules in granule‐dominated sequencing batch reactors

Tian

et al. 2022

Biotech & Bioengineering

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Floccules are another major form of microbial aggregates in aerobic granular sludge systems. Previous studies mainly attributed the persistence of floccules to their relatively faster nutrient uptake and higher growth rate over aerobic granules; however, they failed to unravel the underlying mechanism of the long-term coexistence of these two aggregates. In this work, the existence and function of the floccules in an aerobic granule-dominated sequencing batch reactor were investigated from the view of quorum sensing (QS) and quorum quenching (QQ).The results showed that though the floccules were closely associated with the granules in terms of similar community structures (including the QS-and QQ-related ones), they exhibited a relatively higher QQ-related activity but a lower QS-related activity. A compatible proportion of floccules might be helpful to maintain the QS-related activity and keep the granules stable. In addition, the structure difference was demonstrated to diversify the QS-and QQ-related activities of the floccules and the aerobic granules. These findings could broaden our understanding of the interactions between the coexistent floccules and granules in aerobic granuledominated systems and would be instructive for the development of the aerobic granular sludge process.

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Determining the mechanisms for aerobic granulation from mixed seed of floccular and crushed granules in activated sludge wastewater treatment

Cited by 112 publications

References 42 publications

Powdered keramsite as unconventional method of AGS technology support in GSBR reactor with minimum-optimum OLR

Powdered keramsite as unconventional method of AGS technology support in GSBR reactor with minimum-optimum OLR

Modeling and optimization of granulation process of activated sludge in sequencing batch reactors

Quorum sensing unveils the sludge floccule‐assisted stabilization of aerobic granules in granule‐dominated sequencing batch reactors

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