The viscoelastic characterisation of thermally-treated waste activated sludge

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

doi:10.1016/j.cej.2016.06.082

Cited by 32 publications

(12 citation statements)

References 23 publications

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“…4(a). Similar trends were reported by many authors such as Eshtiaghi, et al [11], Farno, et al [8], Appels, et al [25], Paul, et al [26], Hasar, et al [12], and Manoliadis, et al [27] for other sludge systems. Bingham pseudo-plastic model fitting resulted in the reduction of yield stress from 20.1Pa to 8.3Pa for the increase in temperature from 25˚C to 55˚C as shown in Fig.…”

Section: Effect Of Temperature On Thickened Excess Activated Sludge Rsupporting

confidence: 87%

“…2(a). Similar trends were reported by Baroutian, et al [7], Farno, et al [8] and Spinosa, et al [24]. According to…”

Section: Effect Of Total Solid Concentration On Thickened Excess Actisupporting

confidence: 87%

“…Total solid concentration is a factor that influences the rheology and flow behaviour of thickened excess activated sludge significantly. Baroutian, et al [7] and Farno, et al [8] investigated the effect of total solid concentration and temperature on sludge rheology and found that yield stress increased with increasing solid concentration and decreased with increasing temperature. The increase in shear stress with solid concentration was observed to be more noticeable at higher shear rates.…”

Section: Introductionmentioning

confidence: 99%

“…These changes directly influence the rheological properties of sludge [9]. Viscosity is generally lower with higher temperature and shear rate [8,11,12].…”

Section: Introductionmentioning

confidence: 99%

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Rheological characteristics of municipal thickened excess activated sludge (TEAS): impacts of pH, temperature, solid concentration and polymer dose

et al. 2016

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Rheological characterization of sludge is known to be an essential tool to optimize flow, mixing and other process parameters in wastewater treatment plants. This study deals with the characterization of thickened excess activated sludge in comparison to raw primary sludge and excess activated sludge. The effects of key parameters (total solid concentration, temperature, and pH) on the rheology and flow behaviour of thickened excess activated sludge were studied. The rheological investigations were carried out for total solid concentration range of 0.9%w/w-3.7%w/w, temperature range of 23°C-55°C, and pH range of 3.6-10.0. Different rheological model equations were fitted to the experimental data. The model equations with better fitting were used to calculate the yield stress, apparent, zerorate, infinite-rate viscosities, flow consistency index, and flow index. The decrease in concentration from 3.7%w/w to 3.1%w/w resulted in drastic reduction of yield stress from 27.6Pa to 11.0Pa, and further reduction of yield stress to 1.3Pa was observed as solid concentration was reduced to 1.3%w/w. The viscosity at higher shear rate (>600s-1) decreased from 0.05Pa.s down to 0.008Pa.s when the total solid concentration was reduced from 3.7% to 0.9%. Yield stress decreased from 20.1Pa down to 8.3Pa for Bingham plastic model when temperature was raised from 25˚C to 55˚C. Activation energy and viscosity also showed decreasing trend with increasing temperature. Yield stress of thickened excess activated sludge increased from a value of 6.0Pa to 8.3Pa when pH was increased from 3.6 to 10.0. The effect of polymer dose on the rheological behaviour of thickening of excess activated sludge was also investigated, and the optimum polymer dosage for enhanced thickener performance was determined to be 1.3kg/ton DS.

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Section: Effect Of Temperature On Thickened Excess Activated Sludge Rsupporting

confidence: 87%

“…2(a). Similar trends were reported by Baroutian, et al [7], Farno, et al [8] and Spinosa, et al [24]. According to…”

Section: Effect Of Total Solid Concentration On Thickened Excess Actisupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

“…These changes directly influence the rheological properties of sludge [9]. Viscosity is generally lower with higher temperature and shear rate [8,11,12].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rheological characteristics of municipal thickened excess activated sludge (TEAS): impacts of pH, temperature, solid concentration and polymer dose

et al. 2016

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“…The volume of waste activated sludge (WAS) residues is dramatically increasing owing to the demand for improvements in pollutant removal made by current tightened regulations. 1,2 The large quantities of WAS are a troublesome by-product of wastewater treatment plants (WWTPs), which need to be appropriately handled; otherwise, they could lead to serious environmental impacts. 3 In China, the current production of dewatered WAS is greater than 3.0 Â 10 7 tons (with a water content of 80%) and is expected to continue to increase owing to the stricter environmental regulations and growing amounts of wastewater.…”

Section: Introductionmentioning

confidence: 99%