Feast/famine ratio determined continuous flow aerobic granulation

Sun, Yi; Angelotti, Bob; Brooks, Matt; Wang, Zhi‐Wu

doi:10.1016/j.scitotenv.2020.141467

Cited by 27 publications

(9 citation statements)

References 57 publications

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“…The feast/famine ratio has an impact on aerobic granulation. In this experiment, a feast/famine ratio slightly higher than 0.5 was used, which does not seem to favor granulation, in line with studies that suggest that this is the limit value for obtaining good granulation results [87][88][89][90].…”

Section: Sludge Characteristics and Development Of Agssupporting

confidence: 68%

Continuous-Flow Aerobic Granular Sludge Treatment of Dairy Wastewater

Silva

Santos

et al. 2023

Water

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The authors conducted a study on treating synthetic dairy wastewater using aerobic granular sludge (AGS) in a laboratory-scale continuous flow reactor (CFR) system. The system consisted of an anaerobic reactor, an aerobic reactor, and a settling sedimentation tank, with different hydraulic retention times tested over a 90-day period. The study monitored sludge characteristics and effluent treatment performance and found that the system achieved excellent removal rates for chemical oxygen demand and total carbon, exceeding 90%. As a result, the effluent met Portuguese laws for direct release into the water environment. Moreover, the study found that the AGS system improved the sludge sedimentation capacity from 272 to 80 mL/g, demonstrating its effectiveness as a viable treatment alternative for this type of effluent.

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Section: Sludge Characteristics and Development Of Agssupporting

confidence: 68%

Continuous-Flow Aerobic Granular Sludge Treatment of Dairy Wastewater

Silva

Santos

et al. 2023

Water

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“…Recently, Sun et al [59,60] described a very innovative CFR system incorporating a plug-flow aerobic granulation reactor, formed by multiple completely stirred tank reactors (CSTRs). The main objective of this design was to create different feast-famine conditions and evaluate the influence of this parameter on granular stability.…”

Section: (C) Use Of Clarifiersmentioning

confidence: 99%

New Advances in Aerobic Granular Sludge Technology Using Continuous Flow Reactors: Engineering and Microbiological Aspects

Rosa-Masegosa

Muñoz-Palazon

González‐Martínez

et al. 2021

Water

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Aerobic granular sludge (AGS) comprises an aggregation of microbial cells in a tridimensional matrix, which is able to remove carbon, nitrogen and phosphorous as well as other pollutants in a single bioreactor under the same operational conditions. During the past decades, the feasibility of implementing AGS in wastewater treatment plants (WWTPs) for treating sewage using fundamentally sequential batch reactors (SBRs) has been studied. However, granular sludge technology using SBRs has several disadvantages. For instance, it can present certain drawbacks for the treatment of high flow rates; furthermore, the quantity of retained biomass is limited by volume exchange. Therefore, the development of continuous flow reactors (CFRs) has come to be regarded as a more competitive option. This is why numerous investigations have been undertaken in recent years in search of different designs of CFR systems that would enable the effective treatment of urban and industrial wastewater, keeping the stability of granular biomass. However, despite these efforts, satisfactory results have yet to be achieved. Consequently, it remains necessary to carry out new technical approaches that would provide more effective and efficient AGS-CFR systems. In particular, it is imperative to develop continuous flow granular systems that can both retain granular biomass and efficiently treat wastewater, obviously with low construction, maintenance and exploitation cost. In this review, we collect the most recent information on different technological approaches aimed at establishing AGS-CFR systems, making possible their upscaling to real plant conditions. We discuss the advantages and disadvantages of these proposals and suggest future trends in the application of aerobic granular systems. Accordingly, we analyze the most significant technical and biological implications of this innovative technology.

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“…In terms of phosphorous, some sets of hydrostatic cultivation of OPGs showed depletion while other sets, as well as reactor operation, showed a plenty of phosphate remaining in water (Stauch‐White et al ., 2017 ;Kuo‐Dahab et al ., 2018 ; Ansari et al ., 2021 ). In fill‐and‐draw operation in SBR for OPGs, repetitive feast‐famine conditions occur, and this repetitive feast‐famine cycle has been suggested as a core selection pressure for microbial granulation (Liu and Tay, 2008 ; López‐Palau et al ., 2012 ; Corsino et al ., 2017 ; Sun et al ., 2021 ). In hydrostatic cultivation of OPGs, which is single batch, feast‐famine cycles are very unlikely to happen.…”

Section: Selection Pressures For Photogranulationmentioning

confidence: 99%

Unmasking photogranulation in decreasing glacial albedo and net autotrophic wastewater treatment

Park

Takeuchi

2021

Environmental Microbiology

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Summary In both natural and built environments, microbes on occasions manifest in spherical aggregates instead of substratum‐affixed biofilms. These microbial aggregates are conventionally referred to as granules. Cryoconites are mineral rich granules that appear on glacier surfaces and are linked with expanding surface darkening, thus decreasing albedo, and enhanced melt. The oxygenic photogranules (OPGs) are organic rich granules that grow in wastewater, which enables wastewater treatment with photosynthetically produced oxygen and which presents potential for net autotrophic wastewater treatment in a compact system. Despite obvious differences inherent in the two, cryoconite and OPG pose striking resemblance. In both, the order Oscillatoriales in Cyanobacteria envelope inner materials and develop dense spheroidal aggregates. We explore the mechanism of photogranulation on account of high similarity between cryoconites and OPGs. We contend that there is no universal external cause for photogranulation. However, cryoconites and OPGs, as well as their intravariations, which are all under different stress fields, are the outcome of universal physiological processes of the Oscillatoriales interfacing with goldilocks interactions of stresses. Finding the rules of photogranulation may enhance engineering of glacier and wastewater systems to manipulate their ecosystem impacts.

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Feast/famine ratio determined continuous flow aerobic granulation

Cited by 27 publications

References 57 publications

Continuous-Flow Aerobic Granular Sludge Treatment of Dairy Wastewater

Continuous-Flow Aerobic Granular Sludge Treatment of Dairy Wastewater

New Advances in Aerobic Granular Sludge Technology Using Continuous Flow Reactors: Engineering and Microbiological Aspects

Unmasking photogranulation in decreasing glacial albedo and net autotrophic wastewater treatment

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