Effects of thermal treatment on physical and expression dewatering characteristics of municipal sludge

Guo, Feng; Tan, Wei; Zhong, Nanshan; Liu, Liyan

doi:10.1016/j.cej.2014.03.005

Cited by 65 publications

(13 citation statements)

References 39 publications

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“…However, the pretreatment tends to change the sludge structure from gel-like to pasty-like or allow for an easy transition to a liquid-like material. Several studies (Feng et al, 2014a(Feng et al, , 2014b found that G 0 < G 00 for treated sludge with thermal hydrolysis treatment, suggesting that the solid-like properties nearly vanished and the sludge exhibited liquid-like properties. Therefore, pretreatment of activated sludge tends to have a good influence on pumping or mixing processes for the improvement of sludge flowability in the non-linear viscoelastic region, and the weakness of sludge solid-like properties in the linear viscoelastic region.…”

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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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confidence: 99%

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

et al. 2016

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“…An emerging technology for nutrient recovery from anaerobically digested sludges is a solid/liquid separation and a following micro‐ or ultrafiltration. The shear‐thinning, non‐Newtonian rheological behavior was reported to have a strong influence on dewatering processes and membrane applications , . For this purpose, membrane flux was measured for 35 different centrates to determine the influence of rheological behavior on membrane performance.…”

Section: Resultsmentioning

confidence: 99%

Rheological Characterization of Anaerobic Sludge from Agricultural and Bio‐Waste Biogas Plants

Gienau

Kraume

Rosenberger

2018

Chemie Ingenieur Technik

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Anaerobic sludges taken from 16 different biogas plants were analyzed with respect to their rheological characteristics. All sludges showed temperature‐dependent shear‐thinning behavior with viscosities from 900 – 6000 mPa s at 20 °C. Nevertheless, the liquid fraction of the anaerobic sludges also revealed temperature‐dependent, shear‐thinning behavior with viscosities well above water viscosity (2 – 40 mPa s at 20 °C). The rheological behavior of the liquid phase could be linked to organic fractions, i.e., proteins and polysaccharides. Shear‐thinning and temperature‐dependent behavior was modeled by the power‐law equation and the Arrhenius law, respectively.

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“…The thermal treatment has been found to affect the rheological behaviour of the sludge by modifying the overall sludge properties, including structure, size of flocs and composition [21]. More specifically, thermal treatment can reduce the viscosity and hysteresis area [22] as it weakens the strength of the internal structure by disrupting the sludge flocs.…”

Section: Introductionmentioning

confidence: 98%

Structural model to study the influence of thermal treatment on the thixotropic behaviour of waste activated sludge

Ruiz-Hernando

Labanda

Llorens

2015

Chemical Engineering Journal

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Effects of thermal treatment on physical and expression dewatering characteristics of municipal sludge

Cited by 65 publications

References 39 publications

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

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

Rheological Characterization of Anaerobic Sludge from Agricultural and Bio‐Waste Biogas Plants

Structural model to study the influence of thermal treatment on the thixotropic behaviour of waste activated sludge

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