The effect of process conditions on the flocculation process occurring in an agitated vessel

• Authors: Radek Šulc , Pavel Ditl
• Languages of publication: EN

Abstracts

EN

The effect of flocculation time, flocculant dosage, pollutant concentration, mixing intensity and tank size on flocculation performance was experimentally studied in a mechanically agitated vessel. The macroscopic approach was applied for fl occulation modelling. The simple semi-empirical generalized correlation for flocculation kinetics proposed by Šulc (2003a) and the simple semi-empirical generalized correlation quantifying the effect of flocculation time and flocculant dosage on fl occulation proposed by Šulc, Ditl (2007) were used for data treatment.

Keywords

EN

flocculation; flocculation kinetics; mixing; Rushton turbine; flocculant dosage; scale up.

• Publisher: De Gruyter Open
• Journal: Polish Journal of Chemical Technology
• Year: 2012
• Volume: 14
• Issue: 3
• Pages: 88-96

Dates

published

1 - 10 - 2012

received

accepted

online

31 - 10 - 2012

Contributors

author

Radek Šulc

• Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering, Technická 4, 166 07 Prague, Czech Republic

author

Pavel Ditl

• Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering, Technická 4, 166 07 Prague, Czech Republic

References

• 1. Thomas, D.N., Judd, S.J. & Fawcett, N. (1999). Flocculation modelling: a review. Water Res. 33(7), 1579-1592. DOI: 10.1016/S0043-1354(98)00392-3.[Crossref]
• 2. von Smoluchowski, M. (1917). Versuch einer mathematischen theorie der koagulations - kinetics kolloid lösungen. Z.Phys. Chem. 92, 129-168.
• 3. Šulc, R. & Ditl, P. (2008). The effect of fl occulent dosage onto fl occulation kinetics. Czasopismo Techniczne - Seria:MECHANIKA 105(2), 341-349.
• 4. Šulc, R. (2003). Flocculation in a turbulent stirred vessel. Ph.D. Thesis, Czech Technical University in Prague, Prague, Czech Republic.
• 5. Šulc, R. & Ditl, P. (2007). Flocculation of clay slurry in a vessel agitated by Rushton turbine: effect of clay concentration at mixing intensity 40 W/m3. In 34th International Conference of the Slovak Society of Chemical Engineering SSCHE 2007, 21-25 May 2007. Tatranske Matliare, Slovak Republic: Slovak Society of Chemical Engineering.
• 6. Bernhardt, H. & Schell, H. (1993). Effects of energy input during orthokinetic aggregation on the fi lterability of generated fl ocs. Water Sci. Technol. 27(10), 35-65.
• 7. Camp, T.R. (1955). Flocculation and fl occulation basins. Trans. ASCE 120(1), 1-16.
• 8. Ives, K.J. (1968). Theory and operation of sludge blanket clarifi ers. Proc. Inst. Civ. Eng. 39(2), 243-260.[Crossref]
• 9. Argaman, Y. & Kaufman W.J. (1970). Turbulence and fl occulation. J. Sanit. Eng. Div. ASCE. 96(2), 223-241.
• 10. Lai, R.J. (1975). Physical aspects of mixing in coagulationcontrol. PhD. thesis (part), University of Florida, USA.
• 11. Cleasby, J.L. (1984). Is velocity gradient a valid turbulent fl occulation parameter? J. Environ. Eng. ASCE, 110(5), 875-897. DOI: 10.1061/(ASCE)0733-9372(1984)110:5(875)[Crossref]
• 12. Clark, M.M. (1985). Critique of Camp and Stein´s RMS velocity gradient. J. Environ. Eng. ASCE 111(6), 741-754. DOI: 10.1061/(ASCE)0733-9372(1985)111:6(741)).[Crossref]
• 13. Lee, S.I., Seo, I.S. & Koopman, B. (1994). Effect of mean velocity gradient and mixing time on particle removal in seawater induced fl occulation. Water Air Soil Poll. 78(1-2), 179-188. DOI: 10.1007/BF00475676.[Crossref]
• 14. Lin, S.D. & Lee C.C. (2001). Water and wastewater calculationsmanual. USA: McGraw Hill. ISBN 978-0071371957
• 15. We iner, R.F. & Matthews, R. (2003). EnvironmentalEngineering (4thed.) Boston, USA: Butterworth, Heinemann. ISBN 978-0080494777
• 16. Bache, D.H. & Gregory, R. (2007). Flocs in water treatment. London, UK: IWA Publishing. ISBN: 978-1843390633
• 17. Šulc, R. & Ditl, P. (2002). Effect of Mixing and Flocculation Time onto Flocculation Kinetics and Flocculant Dosage - Rushton turbine. In 15th International Congress of Chemical and Process Engineering CHISA 2002, 25-29 August 2002. Prague, Czech Republic: Czech Society of Chemical Engineering
• 18. Šulc, R. & Ditl, P. (2003). Model kinetiky fl okulace ve statickém směšovači - studie. In 7th International Scientifi c Conference Mechanical Engineering, 5-6 November 2003 (pp. 1-6). Bratislava, Slovak Republic: Slovak University of Technology.
• 19. Suharyono, H. & Hogg, R. (1996). Flocculation in fl ow through pipes and in-line mixers. Miner. Metall. Proc. 13, 93-97.
• 20. Šulc, R. & Ditl, P. (2004). Vliv dávky fl okulantu na fl okulaci - návrh a ověření generalizované korelace. In 8th International Scientifi c Conference Mechanical Engineering, September 2004. Bratislava, Slovak Republic: Slovak University of Technology.
• 21. Oldshue, J.Y. & Mady, O.B. (1978). Flocculation performance of mixing impellers. Chem. Eng. Prog. 74, 103-108.
• 22. Ducoste, J.J. & Clark, M.M. (1998). The infl uence of tank size and impeller geometry on turbulent fl occulation: I. Experimental. Environ. Eng. Sci. 15(3), 215-224. DOI: 10.1089/ ees.1998.15.215.[Crossref]
• 23. Šulc, R. & Ditl P. (2009). Scale up of clay slurry fl occulation in an agitated tank. Chemical and Process Engineering(Inżynieria chemiczna i procesowa) 30(3), 443-451.

Identifiers

DOI

10.2478/v10026-012-0090-5