Characterisation of the evolution of activated sludges using rheological measurements

Guibaud, Gilles; Dollet, P.; Tixier, Nicolas; Dagot, Christophe; Baudu, Michel

doi:10.1016/j.procbio.2003.09.002

Cited by 64 publications

(45 citation statements)

References 25 publications

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“…The evaluation of the sludge's rheological properties at various treatment stages was also performed by many researchers [BAUDEZ et al 2011;BIEŃ et al 2001;CAO et al 2016;GUIBAUD et al 2004;KEMPIŃSKI, MALCZEWSKA 2005;MALCZEWSKA 2008;O'KELLY 2005]. Usually when decreasing the shear rate the measured values of shear stress form a hysteresis loop indicating the thixotropic behaviour.…”

Section: Resultsmentioning

confidence: 99%

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Comparison between different models for rheological characterization of sludge from settling tank

Malczewska

Biczyński

2017

Journal of Water and Land Development

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For citation: Malczewska B., Biczyński A. 2017 AbstractThe municipal sludge characterized non-Newtonian behaviour, therefore the viscosity of the sewage sludge is not a constant value. The laboratory investigation was made using coaxial cylinder with rotating torque and gravimetric concentration of the investigated sludge ranged from 4.40% to 2.09%. This paper presents the investigation on the effect of concentration of rheological sludge behaviour. The three different rheological models: Bingham (plastic model), Ostwald-de Waele (power-law), Hershel-Bulkley's were calculated by fitting the experimental data of shear stress as a function of shear rate to these models. In this study, the 3-parameter Herschel-Bulkley's model fits the experimental data best.

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Section: Resultsmentioning

confidence: 99%

“…Usually when decreasing the shear rate the measured values of shear stress form a hysteresis loop indicating the thixotropic behaviour. Previously reported studies revealed that the sludge samples showed shear-thinning and thixotropic characteristics [CAO et al 2016;GUIBAUD et al 2004;TRAVNIČEK, JUNGA 2014].…”

Section: Resultsmentioning

confidence: 99%

Comparison between different models for rheological characterization of sludge from settling tank

Malczewska

Biczyński

2017

Journal of Water and Land Development

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“…The samples studied in [59,90] have a MLSS concentration significantly lower than those tested in the present research: further analyses will be necessary to explore the behaviour of a highly concentrated sludge.…”

Section: Glycogen Accumulating Organisms (Gao)mentioning

confidence: 87%

“…In a subsequent study [59], some tests on activated sludge from both aeration tanks and laboratory scale pilot plants were carried out using rotational rheometer. Although the MLSS concentration was lower than 10 g L −1 , a similar influence of pH on the mechanical properties of sludge was found.…”

Section: Glycogen Accumulating Organisms (Gao)mentioning

confidence: 99%

“…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%

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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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Liquid crystal behavior of cellulose nanoparticles‐ethyl cellulose composites: Preparation, characterization, and rheology

Basta

Lotfy

Micky

et al. 2020

J of Applied Polymer Sci

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This work deals with assessing the approach for preparation of cellulose nanoparticles (CNPs) to be acted as synergistic component in liquid crystal (LC) ethyl cellulose composite (EC‐CNPs). In this respect different structures of CNPs were prepared by acid and salt agents. These prepared CNPs were characterized by carboxyl content, IR, transmission electron microscope (TEM), and zeta potential, while their composites with EC were characterized by rheological measurements as a key factor for measuring the critical concentration of LC behavior. The results showed that, the crystallinity of CNPs obtained by ammonium persulfate exceeded that prepared by sulfuric acid hydrolysis. TEM images of stained CNPs showed both methods led to produce nanoparticles have rod like shape with aspect ratio (L/W) between 7.69 ± 3 and 31.3 ± 5. For the rheological measurements, it demonstrated the efficient of incorporating the CNPs to EC (EC‐CNPs composites) to decrease the critical concentration of EC from 40 wt% to approximately 34 wt%.

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Characterisation of the evolution of activated sludges using rheological measurements

Cited by 64 publications

References 25 publications

Comparison between different models for rheological characterization of sludge from settling tank

Comparison between different models for rheological characterization of sludge from settling tank

Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

Liquid crystal behavior of cellulose nanoparticles‐ethyl cellulose composites: Preparation, characterization, and rheology

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