The potential use of shear viscosity to monitor polymer conditioning of sewage sludge digestates

Oliveira, Ivo Miguel Delgado Bandeira; Reed, James P.; Abu-Orf, Mohammad; Wilson, Victoria; Jones, D.E.; Esteves, Sandra

doi:10.1016/j.watres.2016.08.007

Cited by 12 publications

(5 citation statements)

References 20 publications

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“…While aer summarizing previous works and our results achieved, we thought it was still a challenge to provide precise and scientic guideline on it. Many literatures 21,22,33,34,38,39 attempt to explore the correlation between rheological measurements and additive dose assessment/control, but no clear conclusion can be drawn because of consensus is still unachieved. For example, Ormeci 38 indicated that the peaks observed in torque readings and entire torque-time rheograms could be used for the determination of the optimum polymer dose and mixing conditions.…”

Section: The Mechanism Of Pam Conditioning On Sludge Dewateringmentioning

confidence: 99%

“…For example, Ormeci 38 indicated that the peaks observed in torque readings and entire torque-time rheograms could be used for the determination of the optimum polymer dose and mixing conditions. Oliveira, et al 22 demonstrated that rheological parameter such as h[0.1/s] could be used for optimizing polymer dosage. Wolny, et al 40 indicated that liquid limit might be useful as the control parameter to guide dosing of additive in sludge treatment.…”

Section: The Mechanism Of Pam Conditioning On Sludge Dewateringmentioning

confidence: 99%

“…18 Thus, many studies have used rheological parameters as indicators of the internal architectural features 19 and quantifying ow behavior or sludge cake behavior in dewatering processes. [20][21][22] However, previous works mainly focus on relating or assessing lterability/ dewaterability with rheological parameters, and there have been few reports of rheological analysis of conditioned sludge and the correlation of rheological parameters with dewatering processes. Indeed, it remains to be determined whether rheological analysis can reveal the mechanism of sludge dewatering.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Applying rheological analysis to understand the mechanism of polyacrylamide (PAM) conditioning for sewage sludge dewatering

Wang

et al. 2017

RSC Adv.

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Section: The Mechanism Of Pam Conditioning On Sludge Dewateringmentioning

confidence: 99%

Section: The Mechanism Of Pam Conditioning On Sludge Dewateringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Applying rheological analysis to understand the mechanism of polyacrylamide (PAM) conditioning for sewage sludge dewatering

Wang

et al. 2017

RSC Adv.

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“…Indeed, sewage sludge contains very high TN based on dry matter basis due to low total solids content of the sludge after efficient centrifugation. In a study by Oliveira et al [48], high correlations between nitrogen content in the digestate and both sludge composition or conditioning parameters were reported. Similar to this study, it was observed that as the sewage sludge proportion increased at the feed, higher colloidal TKN in liquid fractions of the digestates was observed.…”

Section: Correlation Between Parametersmentioning

confidence: 96%

Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions

et al. 2021

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Fast development of centralized agricultural biogas plants leads to high amounts of digestate production. The treatment and disposal of liquid fractions after on-site digestate solid–liquid separation remains problematic due to their high organic, nutrient and aromatic contents. This work aims to study the variability of the remaining compounds in the digestate liquid fractions in relation to substrate origin, process parameters and solid–liquid separation techniques. Twenty-nine digestates from full-scale codigestion biogas plants and one waste activated sludge (WAS) digestate were collected and characterized. This study highlighted the combined effect of the solid–liquid separation process and the anaerobic digestion feedstock on the characteristics of liquid fractions of digestates. Two major clusters were found: (1) liquid fractions from high efficiency separation process equipment (e.g., centrifuge and others with addition of coagulant, flocculent or polymer) and (2) liquid fractions from low efficiency separation processes (e.g., screw press, vibrating screen and rotary drum), in this latter case, the concentration of chemical oxygen demand (COD) was associated with the proportion of cow manure and energy crops at biogas plant input. Finally, SUVA254, an indicator for aromatic molecule content and the stabilization of organic matter, was associated with the hydraulic retention time (HRT).

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“…Ciaciuch, Gaca [138] also used a similar approach, where COD and rheological measurement were used as performance indicators to monitor the performance of two-stage anaerobic digestion process and no solid link between COD and rheological properties were made. The lack of detailed investigation between the relationship of rheological properties and COD was also highlighted by Oliveira, Reed [139]. It was reported that, rheological measurement coupled with COD should be explored further due to the potential it has to aid in monitoring conditioning requirements during plant operation.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

A comprehensive review on rheological studies of sludge from various sections of municipal wastewater treatment plants for enhancement of process performance

Hong

Yeneneh

Sen

et al. 2018

Advances in Colloid and Interface Science

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Large quantities of sludge is generated from different sections of a wastewater treatment plant operation. Sludge can be a solid, semisolid or liquid muddy residual material. Understanding the flow behaviour and rheological properties of sewage sludge at different sections of a wastewater treatment plant (WWTP) is important for the design of pumping system, mixing, hydrodynamics and mass transfer rates of various sludge treatment units, optimization of conditioning dose and for sustainable sludge management. The current article provides a comprehensive review on up to date literature information on rheological behaviour of raw primary sludge, excess activated sludge, thickened excess activated sludge, mixture of raw primary and thickened excess activated sludge (mixed sludge), digested sludge, and biosolid under the influence of different operating parameters and their impacts on process performance. The influences of various process parameters such as solid concentration, temperature, pH, floc particle size, primary to secondary sludge mixing ratio, aging and conditioning agent doses on the rheological behaviour of sludge from different treatment units of WWTPs are critically analysed here. Yield stress was reported to increase with increasing solid concentration for all types of sludge whereas viscosity showed a decreasing trend with decreasing total solid concentration and percentage of thickened excess activated sludge in the mixture. Temperature showed an inverse relationship with yield stress and viscosity. Viscosity was reported to be decreased with decrease in pH. The effect of various conditioning agents on the rheological behaviour of sludge are also discussed here. The applicability and practical significance of various rheological models such as Bingham, Power Law (Ostwald), Herschel-Bulkley, Casson, Sisko, Careau, and Cross models to experimental rheological characteristics of various sludges were presented here. The reported results on various rheological parameters such as shear stress, yield stress, flow index, infinite, zero-rate viscosity, and flow consistency index of different sludge types obtained from the best fitted model were also compiled here. Conclusions have been drawn from the literature reviewed and few suggestions for future research direction are proposed.

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The potential use of shear viscosity to monitor polymer conditioning of sewage sludge digestates

Cited by 12 publications

References 20 publications

Applying rheological analysis to understand the mechanism of polyacrylamide (PAM) conditioning for sewage sludge dewatering

Applying rheological analysis to understand the mechanism of polyacrylamide (PAM) conditioning for sewage sludge dewatering

Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions

A comprehensive review on rheological studies of sludge from various sections of municipal wastewater treatment plants for enhancement of process performance

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