The effect of global velocity gradient on the character and filterability of aggregates formed during the coagulation/flocculation process

Environmental Technology

Volumn 32, Issue 12, 2011, Pages 1355-1366

  Pivokonsky, Martin ^a   Bubakova, Petra ^a   Pivokonska, Lenka ^a   Hnatukova, Petra ^a  

^a INSTITUTE OF HYDRODYNAMICS   (Czech Republic)

Author keywords

aggregate size distribution; filtration; flocculation; fractal dimension; mixing

Indexed keywords

AGGREGATES; COAGULATION; FILTRATION; FLOCCULATION; MIXING; PILOT PLANTS; SUSPENSIONS (FLUIDS); VELOCITY;

AGGREGATE PROPERTIES; AGGREGATE SIZE; AGGREGATE SIZE DISTRIBUTIONS; DEPTH FILTRATION; FERRIC SULPHATE; FILTRATION VELOCITY; FLOW-MIXING; FRACTAL ANALYSIS; MINIMUM PRESSURE; PILOT PLANT OPERATIONS; VELOCITY GRADIENTS;

FRACTAL DIMENSION;

FERRIC SULFATE;

AGGREGATE; COAGULATION; DIAMETER; EXPERIMENTAL STUDY; FILTRATION; FLOCCULATION; FRACTAL ANALYSIS; IMAGE ANALYSIS; MIXING; SIZE DISTRIBUTION; VELOCITY STRUCTURE;

ARTICLE; BLOOD CLOTTING; CELL AGGREGATION; FILTRATION; FLOCCULATION; FRACTAL ANALYSIS; GLOBAL VELOCITY GRADIENT; IMAGE ANALYSIS; STRUCTURE ANALYSIS; VELOCITY;

EID: 80052830572     PISSN: 09593330     EISSN: 1479487X     Source Type: Journal    
DOI: 10.1080/09593330.2010.536786     Document Type: Article

References (45)

1. J.K. van Benschoten and J.K. Edzwald, Chemical aspects of coagulation using aluminium salts - I. Hydrolytic reactions of alum and polyaluminium chloride, Water Res. 24 (1990), pp. 1519-1526. (Pubitemid 20385371)
2. P. Dolejs, Effects of temperature, coagulant dosage and rapid mixing on particle-size distribution, Environ. Protect. Eng. 9 (1983), pp. 55-66. (Pubitemid 14118050)
3. C.S.B. Fitzpatrick, E. Fradin, and J. Gregory, Temperature effects on coagulation, using different coagulants, Water Sci. Technol. 50 (2004), pp. 171-175. (Pubitemid 40207523)
4. P. Polasek and S. Mutl, Optimization of reaction conditions of particle aggregation in water purification - back to basics, Water SA 31 (2005), pp. 61-72. (Pubitemid 40328506)
5. P. Polasek, The significance of the root mean square velocity gradient and its calculation in devices for water treatment, Water SA 5 (1979), pp. 196-207. (Pubitemid 10069594)
6. P. Polasek, Differentiation between different kinds of mixing in water purification - back to basics, Water SA 33 (2007), pp. 249-251. (Pubitemid 46683242)
7. T. Serra, J. Colomer, and B.E. Logan, Efficiency of different shear devices on flocculation, Water Res. 42 (2008), pp. 1113-1121. (Pubitemid 351233055)
8. J. Gregory, The role of floc density in solid-liquid separation, Filtr. Sep. 35 (1998), pp. 367-371. (Pubitemid 28388489)
9. P. Polasek and S. Mutl, Cationic polymers in water treatment. Part 2: Filterability of CPE-formed suspension, Water SA 28 (2002), pp. 83-88. (Pubitemid 34196737)
10. T.R. Camp and P.C. Stein, Velocity gradient and internal work in fluid motion, J. Boston Soc. Civil Eng. 30 (1943), pp. 219-237.
11. T.A. Kramer and M.M. Clark, Modelling orthokinetic coagulation in spatially varying laminar flow, J. Colloid Interface Sci. 227 (2000), pp. 251-261. (Pubitemid 30470540)
12. C. Coufort, D. Bouyer, and A. Line, Flocculation related to local hydrodynamics in Tailor-Couette reactor and in a jar, Chem. Eng. Sci. 60 (2005), pp. 2179-2192. (Pubitemid 40306775)
13. D. Bouyer, C. Coufort, A. Line, and Z. Do-Quang, Experimental analysis of floc size distributions in a 1-L jar under different hydrodynamics and physicochemical conditions, J. Colloid Interface Sci. 292 (2005), pp. 413-428. (Pubitemid 41607681)
14. P. Jarvis, B. Jefferson, J. Gregory, and S.A. Parsons, A review of floc strength and breakage, Water Res. 39 (2005), pp. 3121-3137. (Pubitemid 41138818)
15. N. Tambo and H. Hozumi, Physical characteristics of flocs - II. Strength of floc, Water Res. 13 (1979), pp. 421-427. (Pubitemid 9229522)
16. R.J. Francois, Strength of aluminium hydroxide flocs, Water Res. 21 (1987), pp. 1023-1030. (Pubitemid 18052795)
17. R.C. Sonntag and W.B. Russel, Structure and break-up of flocs subjected to fluid stresses: II Theory, J. Colloid Interface Sci. 115 (1987), pp. 378-389.
18. V. Oles, Shear-induced aggregation and break-up of polystyrene latex particles, J. Colloid Interface Sci. 154 (1992), pp. 351-358.
19. P.T. Spicer and S.E. Pratsinis, Shear-induced flocculation: the evolution of floc structure and the shape of the size distribution at steady state, Water Res. 30 (1996), pp. 1049-1056. (Pubitemid 26148194)
20. M.M. Clark and J.R.V. Flora, Floc restructuring in varied turbulent mixing, J. Colloid Interface Sci. 147 (1991), pp. 407-421.
21. P.T. Spicer, S.E. Pratsinis, J. Raper, R. Amal, G. Bushell, and G. Meesters, Effect of shear schedule on particle size, density and structure during flocculation in stirred tanks, Powder Technol. 97 (1998), pp. 26-34. (Pubitemid 28238436)
22. C. Selomulya, G. Bushell, R. Amal, and T.D. Waite, Aggregation mechanisms of latex of different particle sized in a controlled shear environment, Langmuir 18 (2002), pp. 1974-1984. (Pubitemid 35390163)
23. B. Gorczyca and J. Ganczarczyk, Structure and porosity of alum coagulation flocs, Water Qual. Res. J. Can. 34 (1999), pp. 653-666.
24. T. Li, Z. Zhu, D. Wang, Ch. Yao, and H. Tang, Characterization of floc size, strength and structure under various coagulation mechanisms, Powder Technol. 168 (2006), pp. 104-110. (Pubitemid 44414904)
25. C. Coufort, D. Bouyer, A. Line, and B. Haut, Modelling of flocculation using a population balance equation, Chem. Eng. Process. 46 (2007), pp. 1264-1273. (Pubitemid 47532239)
26. W. Xu, B. Gao, Q. Yue, and Y. Wang, Effect of shear force and solution pH on flocs breakage and re-growth formed by nano-Al13 polymer, Water Res. 44 (2010), pp. 1893-1899.
27. P. Polasek and S. Mutl, Guidelines to Coagulation and Flocculation for Surface Waters. Volume 1: Design Principles for Coagulation and Flocculation, PPA, Marshalltown, South Africa, 1995.
28. M. Pivokonsky, R. Pivokonsky, L. Benesova, and S. Mutl, Methodology of evaluation of size and sizedistribution of particles formed during aggregation, J. Hydrol. Hydromech. 51 (2004), pp. 281-287.
29. Q. Jiang and B.E. Logan, Fractal dimensions of aggregates determined from steady state size distributions, Environ. Sci. Technol. 36 (1991), pp. 2031-2038.
30. R.K. Chakraborti, K.H. Garner, J. Kaur, and F.J. Atkinson, In situ analysis of flocs, J. Water SRT -AQUA 56 (2007), pp. 1-11.
31. N.H.G. Rahmani, T. Dabros, and J.H. Masliyah, Fractal structure of asphaltene aggregates, J. Colloid Interface Sci. 285 (2005), pp. 599-608. (Pubitemid 40544679)
32. B.B. Mandelbrot, The Fractal Geometry of Nature, W.H. Freeman, New York, 1983.
33. D.H. Bache and E.R. Rasool, Characteristics of alumino-humic flocs in relation to DAF performance, Water Sci. Technol. 43 (2001), pp. 203-208. (Pubitemid 32492362)
34. D.H. Bache, E.R. Rasool, D. Moffat, and F.J. McGilligan, On the strength and character of alumino-humic flocs, Water Sci. Technol. 40 (1999), pp. 81-88.
35. D. Bouyer, A. Line, A. Cockx, and Z. Do-Quang, Experimental analysis of floc size distribution and hydrodynamics in a jar-test, Trans IChemE Journal 79 (2001), pp. 1017-1024. (Pubitemid 34137706)
36. J. Gregory, Monitoring particle aggregation process, Adv. Colloid Interface Sci. 147-148 (2009), pp. 109-123.
37. F. Maggi, F. Mietta, and J.C. Winterwerp, Effect of variable fractal dimension on the floc size distribution of suspended cohesive sediment, J. Hydrol. 343 (2007), pp. 43-55. (Pubitemid 47259487)
38. K.J. Ives, Deep bed filtration, in Solid/Liquid Separation Equipment Scale-up, D. Purchas, ed., Uplands Press, Croydon, 1977.
39. S. Mutl and B. Knesl, Application of a fluidized layer of granular material in the treatment of surface water. Part 1: aggregation efficiency of the layer, J. Water SRT - AQUA 48 (1999), pp. 24-30.
40. M. Pivokonsky, L. Pivokonska, and H. Tomaskova, Aggregation capability of a fluidized layer of granular material during treatment of water with high DOC and low alkalinity, Water Sci. Technol. Water Suppl. 8 (2008), pp. 9-17. (Pubitemid 351703196)
41. H.H. Ngo, S. Vigneswaran, and H.B. Dharmappa, Optimization of direct filtration: experiments and mathematical models, Environ. Technol. 16 (1995), pp. 55-63.
42. R. Bai and Ch. Tien, Particle detachment in deep bed filtration, J. Colloid Interface Sci. 186 (1997), pp. 307-317. (Pubitemid 27468832)
43. A. Amirtharajah, Some theoretical and conceptual views of filtration, J. AWWA 80 (1988), pp. 36-46.
44. A. Adin and M. Rebhun, Deep-bed filtration: accumulation- detachment model parameters, Chem. Eng. Sci. 42 (1987), pp. 1213-1219. (Pubitemid 17631711)
45. P. Raveendran and A. Amirtharajah, Role of shortrange forces in particle detachment during filter backwashing, J. Env. Eng. 121 (1995), pp. 860-868.