Characterization of floc structure and strength: Role of changing shear rates under various coagulation mechanisms

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Volumn 379, Issue 1-3, 2011, Pages 36-42

  Wang, Dongsheng ^a   Wu, Ruobing ^b   Jiang, Yunzhong ^b   Chow, Christopher W K ^a,c  

^a RESEARCH CENTER FOR ECO ENVIRONMENTAL SCIENCES   (China)

^b CHINA INSTITUTE OF WATER RESOURCES AND HYDROPOWER RESEARCH   (China)

^c AUSTRALIAN WATER QUALITY CENTRE   (Australia)

Author keywords

Floc strength; Flocculation; Fractal dimension; Shear rate; Size distribution

Indexed keywords

COAGULATION; FLOCCULATION; INITIATORS (CHEMICAL); KAOLIN; PARTIAL DISCHARGES; SHEAR DEFORMATION; SIZE DETERMINATION; SIZE DISTRIBUTION;

AGITATION RATES; COAGULATION MECHANISM; CONTROLLED EXPERIMENT; FLOC FORMATION; FLOC SIZE DISTRIBUTION; FLOC STRENGTH; FLOC STRUCTURE; FRACTAL THEORY; SHEAR RATE; SHEAR RATES; STRENGTH FACTOR;

FRACTAL DIMENSION;

ARTICLE; FLOCCULATION; FRACTAL ANALYSIS; PRIORITY JOURNAL; SHEAR RATE;

EID: 79953296834     PISSN: 09277757     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.colsurfa.2010.11.048     Document Type: Article

References (38)

1. Li T., Zhu Z., Wang D.S., Yao C.H., Tang H.X. Characterization of floc size, strength and structure under various coagulation mechanisms. Powder Technol. 2006, 168:104-110.
2. Sharp E.L, Jarvis P., Parsons S.A., Jefferson B. The impact of zeta potential on the physical properties of ferric-NOM flocs. Environ. Sci. Technol. 2006, 40:3934-3940.
3. Rattanakawin C., Hogg R. Aggregate size distributions in flocculation. Colloids Surf. A: Physicochem. Eng. Aspects Sci. 2001, 177:87-98.
4. Jarvis P., Jefferson B., Gregory J., Parsons S.A. A review of floc strength and breakage. Water Res. 2005, 39:3121-3137.
5. Bouyer D., Coufort C., Line A., Do-Quang Z. Experimental analysis of the floc size distribution in a 1-L jar under different hydrodynamics and physicochemical conditions. J. Colloid Interface Sci. 2005, 292:413-428.
6. Thill A., Veerapaneni S., Simon B., Wiesner M., Bottero J.Y., Snidaro D. Determination of Structure of aggregates by confocal scanning laser microscopy. J. Colloid Interface Sci. 1998, 204:357-362.
7. Thill A., Lambert S., Moustier S., Ginestet P., Audic J.M., Bottero J.Y. Structural interpretations of static light scattering patterns of fractal aggregates. J. Colloid Interface Sci. 2000, 228:386-392.
8. Li X.Y., Logan B.E. Collision frequencies of fractal aggregates with small particles by differential sedimentation. Environ. Sci. Technol. 1997, 31:1229-1236.
9. Li X.Y., Logan B.E. Collision frequencies between fractal aggregates and small particles in a turbulently sheared fluid. Environ. Sci. Technol. 1997, 31:1237-1242.
10. Li X.Y., Ruby P.C.L. Determination of the fractal dDimension of microbial flocs from the change in their size distribution after breakage. Environ. Sci. Technol. 2005, 39:2731-2735.
11. Jung S.J., Amal R., Raper J.A. Monitoring effects of shearing on floc structure using small-angle light scattering. Powder Technol. 1996, 88:51-54.
12. Spicer P.T., Pratsinis S.E., Raper J., Amal R., Bushell G., Meesters G. Effect of shear schedule on particle size, density and structure during flocculation in stirred tanks. Powder Technol. 1998, 97:26-34.
13. Jarvis P, Jefferson B., Parsons S.A. Breakage, regrowth, and fractal nature of natural organic matter flocs. Environ. Sci. Technol. 2005, 39:2307-2314.
14. Tang P., Greenwood J., Raper J.A. A model to describe the settling behavior of fractal aggregates. J. Colloid Interface Sci. 2002, 247:210-219.
15. Gregory J., Rossi L. Dynamic testing of water treatment coagulants. Water Sci. Technol.: Water Supply 2001, 1:65-72.
16. Witten T.A., Sander L.M. Diffusion-limited aggregation: a kinetic critical phenomenon. Phys. Rev. Lett. 1981, 47:1400-1403.
17. Tanaka H., Araki T. Simulation method of colloidal suspensions with hydrodynamic interactions: fluid particle dynamics. Phys. Rev. Lett. 2000, 85:1338-1341.
18. Terao T., Nakayama T. Sol-gel transition of reversible cluster-cluster aggregations. Phys. Rev. E 1998, 58:3490-3494.
19. Gardnera K.H., Theisb T.L., Youngb T.C. Colloid aggregation: numerical solution and measurements. Colloids Surf A: Physicochem. Eng. Aspects Sci. 1998, 141:237-252.
20. Lin M.Y., Lindsay H.M., Weitz D.A., Ball R.C., Klein R., Meakin P. Universality in colloid aggregation. Nature 1989, 339:360-362.
21. Tambo N., Watanabe Y. Physical characteristics of floc-: the floc density function and aluminium floc. Water Res. 1978, 13:409-419.
22. Tambo N., Hozumi H. Physical characteristics of flocs-: strength of flocs. Water Res. 1979, 13:421-427.
23. Bache D.H., Rasool E., Moffat D., McGilligan F.J. On the strength and character of alumino-humic flocs. Water Sci. Techenol. 1999, 40:81-88.
24. Jarvis P., Jefferson B., Parsons S.A. How the natural organic matter to coagulant ratio impacts on floc structure properties. Environ. Sci. Technol. 2005, 39:8919-8924.
25. Gregory J., Yukselen M.A. The reversibility of floc breakage. Int. J. Miner. Proc. 2004, 73:251-259.
26. Chakrabortia R.K., Gardnerb K.H., Atkinsona J.F., et al. Changes in fractal dimension during aggregation. Water Res. 2003, 37:873-883.
27. O'Melia C.R. Coagulation and sedimentation in lakes, reservoirs and water treatment plants. Water Sci. Technol. 1998, 37:129-135.
28. Gregory J. The role of floc density in solid-liquid separation. Filtr. Sep. 1998, 35:367-371.
29. Meakin P. Fractal aggregates. Adv. Colloid Interface Sci. 1988, 28:249-331.
30. Tang S., Ma Y., Shiu C. Modeling the mechanical strength of fractal aggregation. Coloids Surf. A 2001, 180. 7-l6.
31. Kranenburg C. Effects of floc strength on viscosity and deposition of cohesive suspensions. Continent. Shelf Res. 1999, 19:1665-1680.
32. Yang T.S., Xiong X.Z., Zhan X.L., Yang M.Q. On flocculaton of cohesive fine sediment. Hydro-Sci. Eng. 2003, 2:65-77. (In Chinese).
33. Tang S. A model to describe the settling behavior of fractal aggregates. Colloids Surf. A: Physicochem. Eng. Aspects Sci. 1999, 157:185-192.
34. Thill A., Wagner M., Bottero J.Y. Confocal scanning laser microscopy as a tool for the determination of 3D floc structure. J. Colloid Interface Sci. 1999, 220:465-467.
35. P.T. Spicer, Shear-induced aggregation-fragmentation: mixing and aggregate morphology effects, Doctor Dissertation, 1997.
36. Wu R.M., Lee D.J., Waite T.D., Guan J. Multilevel structure of sludge flocs. J. Colloid Interface Sci. 2002, 252:383-392.
37. Spicer P.T., Pratsinis S.E., Trennepohl M.D. Coagulation and fragmentation: the variation of shear rate and the time lag for attainment of steady state. Ind. Eng. Chem. Res. 1996, 35:3074-3080.
38. Rastegari K., Svrcek W.Y., Yarranton H.W. Kinetics of asphaltene flocculation. Ind. Eng. Chem. Res. 2004, 43:6861-6870.