De Kreuk, Merle K.

Fernandes del Pozo, David

Nopens, Ingmar

Tobo, Yohannis

Van Geem, Kevin

van Lier, Jules B.

English

Ghent University Academic Bibliography

Motivation of workAcknowledgmentsContactConclusionshttp://biomath.ugent.beDavid Fernandes del Pozo1, Yohannis Mitiku Tobo1, Kevin Van Geem2, Merle K. de Kreuk3, Jules B. van Lier3, Ingmar Nopens11 BIOMATH, Department of Mathematical Modelling, Statistics and Bioinformatics, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium 2 Laboratory of Chemical Technology, Ghent University, B-9052, Belgium3 Department of Water Management, Sanitary Engineering Section, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands• Benefits? Mixing is evaluated in terms of height heterogeneitiesBetter understanding of its spatial behaviour Knowledge can be used to reduce model uncertaintiesCharacterization of full-scale sludge viscosity and density: Testing the stratification hypothesisRheologyFull-scale WWTP reactorBulk & Floc densitiesConcentrationhttp://www.pretref.ugent.be• Little difference is found with respect to water bulk density.• Method: PercollTM PLUS (ρ=1.13 g/mL) Eflluent water (ρ≈0.99 g/mL)1.03 1.035 1.04 1.045 1.05 1.055 1.06 1.065 1.07Results from overflow sludge with Δρ=0.005 g/mL • Method: Standard methods (2540B, 2540D) with triplicates• Stratification is present in terms of TS below 10m depth.David.FernandesdelPozo@UGent.beFinancial support from Ghent University (Belgium) through GOA project BOF16/GOA/004 is gratefully acknowledged.Sampling ports• Objective:  Test the stratification hypothesis in a WWTP full-scale anaerobic digester (Breda, The Netherlands).• Why? It has been often mentioned in literature, but little or no evidence at all has been provided so far to prove its existence.• How? By characterizing the sludge properties at different heights• Bulk ρmethod: Calibrated pycnometer (50 mL)• Method: Anton Paar MCR305 rheometer at T=35˚CShear stress controlled mode: pre-shear > rest > shear• From a physical characterization, a mild stratification may be present below 10 m depth (≈ 46.5% of the reactor volume).• Results do not fully imply that the reactor is CSTR.• A single-phase non-Newtonian can be justified to be a validmodeling assumption in a Computational Fluid Dynamic model• There is currently no criterion to determine if stratification is present.Nº IWA - 01039• Mild differences are found on floc density below 15 m depth.Bars should be interpreted as observed density ranges

Characterization of full-scale sludge viscosity and density: Testing the stratification hypothesis

https://biblio.ugent.be/publication/8542240/file/8542241

Characterization of full-scale sludge viscosity and density: Testing the stratification hypothesis

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Ghent University Academic Bibliography