Yield stress and rheological characteristics of activated sludge in an airlift membrane bioreactor

Yang, Fei; Bick, Amos; Shandalov, Semion; Brenner, Asher; Oron, Gideon

doi:10.1016/j.memsci.2009.02.022

Cited by 79 publications

(56 citation statements)

References 50 publications

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“…Since the flow, Q (m 3 /s), is kept constant, dQ/dt = 0, and thus combining Equations (19)- (21), yields the final and full model formulation shown in Equations (22) and (23). Equation (22) ) formulation via the Carman-Kozeny equation [22].…”

Section: Constant Flow/varying Trans-membrane Pressure (Tmp) Modementioning

confidence: 99%

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Development of a Comprehensive Fouling Model for a Rotating Membrane Bioreactor System Treating Wastewater

Paul

Jones

2015

Water

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Membrane bioreactors (MBRs) are now main stream wastewater treatment technologies. In recent times, novel pressure driven rotating membrane disc modules have been specially developed that induce high shear on the membrane surface, thereby reducing fouling. Previous research has produced dead-end filtration fouling model which combines all three classical mechanisms that was later used by another researcher as a starting point for a greatly refined model of a cross flow side-stream MBR that incorporated both hydrodynamics and soluble microbial products' (SMP) effects. In this study, a comprehensive fouling model was created based on this earlier work that incorporated all three classical fouling mechanisms for a rotating MBR system. It was tested and validated for best fit using appropriate data sets. The initial model fit appeared good for all simulations, although it still needs to be calibrated using further appropriate data sets.

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Section: Constant Flow/varying Trans-membrane Pressure (Tmp) Modementioning

confidence: 99%

“…Using the Brookfield rotating viscometer (mentioned in Section 3.1) which also acted as rheometer, measurements were taken following protocols in-line with Yang et al [23] and Ratkovich et al [24]. The readily designed software program for the apparatus was used for system control and collection of data.…”

Section: Shear and Viscosity Experimentsmentioning

confidence: 99%

Development of a Comprehensive Fouling Model for a Rotating Membrane Bioreactor System Treating Wastewater

Paul

Jones

2015

Water

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“…Appropriate treatment of wastewater as a result of efficient design and operation would help in environment protection and preservation [56]. This significance motivates the recent experimental investigations and mathematical modelling on activated sludge rheology and on the impact of rheological properties on operating parameters for conventional activated sludge plants (e.g., [57][58][59]) and for membrane bioreactors MBRs (e.g., [51,60,61]). …”

Section: Introductionmentioning

confidence: 96%

“…Rheological properties are crucial for activated sludge applications in wastewater treatment plants, since they severely impact the flow behaviour and many aspects that interfere with process performance and energy consumption, for example, sludge pumping, bioreactor hydrodynamics, mass transfer efficiency of aeration systems, sludge-water separation via settling, and filtration [47][48][49][50][51][52][53][54]. Due to the observed significant impact of rheology on different processes, a good knowledge of the activated sludge rheological behaviour is of great importance in both optimizing design and operation of sewage treatment plants [55].…”

Section: Introductionmentioning

confidence: 99%

“…For a non-Newtonian liquid, the measured viscosity becomes dependent on the rate of shear, and the so-called apparent viscosity is introduced which is defined as the ratio between shear stress and shear rate at a given point of the flow curve. The apparent viscosity allows us to interpret the external and internal interaction forces between the constituents of the sludge that influences its rheological behaviour [51]. A highly concentrated sludge exhibits yield stress that is the critical stress triggering plastic deformation of the material continuum.…”

Section: Introductionmentioning

confidence: 99%

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Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

Abbà

Collivignarelli

Manenti

et al. 2017

Journal of Chemistry

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A thermophilic aerobic membrane reactor (TAMR) treating high-strength COD liquid wastes was submitted to an integrated investigation, with the aim of characterizing the biomass and its rheological behaviour. These processes are still scarcely adopted, also because the knowledge of their biology as well as of the physical-chemical properties of the sludge needs to be improved. In this paper, samples of mixed liquor were taken from a TAMR and submitted to fluorescent in situ hybridization for the identification and quantification of main bacterial groups. Measurements were also targeted at flocs features, filamentous bacteria, and microfauna, in order to characterize the sludge. The studied rheological properties were selected as they influence significantly the performances of membrane bioreactors (MBR) and, in particular, of the TAMR systems that operate under thermophilic conditions (i.e., around 50 ∘ C) with high MLSS concentrations (up to 200 gTS L −1 ). The proper description of the rheological behaviour of sludge represents a useful and fundamental aspect that allows characterizing the hydrodynamics of sludge suspension devoted to the optimization of the related processes. Therefore, in this study, the effects on the sludge rheology produced by the biomass concentration, pH, temperature, and aeration were analysed.

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Influence of sewage sludge on the rheological properties of petroleum coke–water slurry

Duan

Liu

et al. 2012

Asia-Pacific J Chem Eng

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Environmental concerns have stimulated proper treatment in utilizing sewage sludge derived from different industries. The main objective of the present study is to prepare high‐quality petroleum coke–sludge slurry (PCSS) with low viscosity and good stability by adding sewage sludge into petroleum coke–water slurry (PCWS), and a systematic investigation of the rheological properties of PCSS and PCWS, along with the sewage sludge, is conducted. The experimental results show that the PCWS is a dilatant fluid and has inferior stability; sewage sludge is a pseudoplastic fluid. As a certain amount of sewage sludge is added into PCWS to obtain PCSS, rheological properties are changed from a shear‐thickening property to a shear‐thinning property. Raw sewage sludge has higher bound water content and larger viscosity. Alkaline chemical additives are selected as sewage sludge modifiers to turn bound water into free‐flowing water and reduce the viscosity. The static stability of PCSS was analyzed by the water separation ratio. Results indicate that sewage sludge has a significant impact on the static stability of PCSS. Water separation ratio decreases and the static stability is improved after addition of the sewage sludge. The higher the sewage sludge amount, the better the static stability of the PCSS. © 2012 Curtin University of Technology and John Wiley & Sons, Ltd.

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Yield stress and rheological characteristics of activated sludge in an airlift membrane bioreactor

Cited by 79 publications

References 50 publications

Development of a Comprehensive Fouling Model for a Rotating Membrane Bioreactor System Treating Wastewater

Development of a Comprehensive Fouling Model for a Rotating Membrane Bioreactor System Treating Wastewater

Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

Influence of sewage sludge on the rheological properties of petroleum coke–water slurry

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