Impact of temperature and duration of thermal treatment on different concentrations of anaerobic digested sludge: Kinetic similarity of organic matter solubilisation and sludge rheology

Farno, Ehsan; Baudez, Jean-Christophe; Parthasarathy, Rajarathinam; Eshtiaghi, Nicky

doi:10.1016/j.cej.2015.03.097

Cited by 43 publications

(19 citation statements)

References 25 publications

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“…Indeed, similar trend of change in G′ and G″ with temperature and time as observe in Fig.3a and 3b indicates that the impact of time (thermal treatment duration) on sludge moduli was similar to the impact of temperature on them. Farno et al (2015) [7] also reported that the effect of thermal treatment duration on the yield stress and infinite viscosity of sludge was similar to the effect of temperature on them. It means the kinetic of COD solubilisation at constant temperature (50-80°C) is a time dependent phenomenon.…”

mentioning

confidence: 92%

“…Literature survey suggests that thermal treatment of sludge (digested or WAS) at 50-80°C results in modification of sludge rheological properties such as yield stress and apparent viscosity [7]. Farno et al (2014Farno et al ( , 2015 and 2016) [7][8][9] showed that the yield stress and the apparent viscosity of digested sludge and WAS reduced by increasing thermal treatment temperature and its duration and there is a linear relationship between thermally-induced compositional change of sludge indicated by soluble COD and the decrease in yield stress and infinite viscosity. They proved that the compositional changes of sludge (i.e.…”

mentioning

confidence: 96%

“…solublisation of particulate organic matter into liquid phase) drives the rheological modifications. A power-logarithmic relationship could describe the trend of increasing soluble COD, decreasing dimensionless form of yield stress and infinite viscosity with duration of thermal treatment time regardless of sludge type (digested sludge or WAS), concentration (2-8 wt.% TS) and thermal treatment temperature (50-80°C) [7,9].…”

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confidence: 99%

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The viscoelastic characterisation of thermally-treated waste activated sludge

Farno

Baudez²,

Parthasarathy

et al. 2016

Chemical Engineering Journal

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confidence: 92%

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confidence: 96%

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confidence: 99%

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The viscoelastic characterisation of thermally-treated waste activated sludge

Farno

Baudez²,

Parthasarathy

et al. 2016

Chemical Engineering Journal

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“…In general, a large amount of soluble organics released is an indication of sludge solubilization as a result of bound EPS solubilized or cell lysis. This solubilization process may result in the reduction of yield stress, apparent viscosity (Farno et al, 2015). Moreover, the variation of EPS components, such as the ratio of proteins and polysaccharides in bound EPS, was possibly related to the lowest elastic properties of the digested sludge from the MW-two stage reactor in the linear viscoelastic region.…”

Section: Effects Of Pretreatment On Digested Sludge Characteristicsmentioning

confidence: 99%

Rheological properties of sewage sludge during enhanced anaerobic digestion with microwave-H2O2 pretreatment

et al. 2016

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a b s t r a c tThe rheological behavior of sludge is of serious concern in anaerobic digestion. This study investigated the rheological properties of sewage sludge during enhanced anaerobic digestion with microwave-H 2 O 2 pretreatment (MW-H 2 O 2 ). The results showed that MW-H 2 O 2 pretreatment resulted in the improvement of sludge flowability and weakening of its viscoelastic properties. Further positive effects on the rheological properties of digested sludge during anaerobic digestion were observed. The flowability was improved with a low level of apparent viscosity. The decrease of the consistency index and increase of the flow behavior index indicated that the strength of the inner structures and non-Newtonian flow characteristics of digested sludge weakened. Both the storage modulus (G 0 ) and loss modulus (G 00 ) decreased, indicating that the viscoelastic behavior became weak. These effects were possibly attributed to the changes of the digested sludge micro-structures, such as extracellular polymeric substances (EPS). This study concluded that anaerobic digestion for treating sewage sludge combined with pretreatment is a more favorable option than single anaerobic digestion from the perspective of rheology.

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“…In another study, (Farno, et al, 2015) were able to monitor and optimize the rate of COD solubilisation under various thermal conditions and solids concentrations, through the use of rheology. Their studies revealed a linear relationship between solubilised COD, yield stress and apparent viscosity.…”

Section: Current Applications Of Rheology In Industrymentioning

confidence: 99%

Enhancement of Sludge Dewatering: A look at Polymer Maturation and Shear Optimization

Martirosyan¹

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The expected growth in global population and overall development of living standards will inevitably have an impact on wastewater treatment infrastructure. This will in turn put pressure on local wastewater treatment plants to handle greater throughput at a higher efficiency. Sludge treatment is one of the components of a treatment plant that will need to be enhanced as various elements rely heavily on operator empirical experience, or tests that reveal information about sludge after the fact. For example, crystalline polymers are often used for coagulation and flocculation of solids, however, the preparation methodology that is currently employed is typically based on operator judgement. Furthermore, the attempts that have been made to quantify polymer quality in terms of its optimal maturation time, with the use of viscosity and electrical conductivity, have not yielded conclusive results to determine optimal polymer age for application to sludge. In addition, the laboratory tests used measure sludge characteristics (such as total solids) are time consuming and by the time results are generated, sludge characteristics have likely changed. The first phase of this study was aimed at developing a new methodology to determine the optimal polymer maturation time which would yield the highest quality of dewatering. With the use of spectrophotometry, the optimal maturation time was estimated and corroborated by spiking anaerobically digested sludge with polymers of different age. A significant difference (p<0.05) was found between the filtration volume of sludge spiked with polymer that was aged for three hours compared to six hours. In addition, the spectrophotometer had the sensitivity to detect changes to polymer temperature, pH, chlorine content, and mixing method. Temperature, pH, and mixing regime had the greatest influence on maturation. In the second phase of the study

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Impact of temperature and duration of thermal treatment on different concentrations of anaerobic digested sludge: Kinetic similarity of organic matter solubilisation and sludge rheology

Cited by 43 publications

References 25 publications

The viscoelastic characterisation of thermally-treated waste activated sludge

The viscoelastic characterisation of thermally-treated waste activated sludge

Rheological properties of sewage sludge during enhanced anaerobic digestion with microwave-H2O2 pretreatment

Enhancement of Sludge Dewatering: A look at Polymer Maturation and Shear Optimization

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