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e-ISSN: 1735-2630
p-ISSN: 1735-1472
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Volume 7 (2010)
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Experimental and modeling investigation of sewage solids sedimentation based on particle size distribution and fractal dimension
Article 5: Volume 7, Number 1, Pages 37-46 (10), Winter 2010 XML PDF (751 K)
Authors
J. Wu; Ch. He
Abstract
SSewage solids are usually characterized by non-specific parameters such as suspended solids. The suspended solids has been shown to be an inadequate index for advanced water treatment processes. In this study, the sewages solids particle size distribution was used to provide more detailed information on sewage characteristic. It is hoped that, by introducing particle size distribution, the mechanism of sewage solids sedimentations can be better understood. The particle size distribution of the domestic sewage was measured by the Malvern® laser scattering technique to link to its settlement efficiency. Experimental results show that 77 % of particle volume was removed during the 90 min settling, of which 71.2 % of particle volume was removed in the initial 30 min. The submicron particles were found to be removed by co-settling with large particles. The fractal dimensions of sewage solids could also be derived from the laser scattering measurement. The fractal dimension could also provide useful information on the shape and density of sewage solids. A mathematical model considering the particle sizes, shapes and density changes was then constructed to simulate the settlement of raw sewage particles. Comparison of the modeling results based on discrete and flocculant settling theory shows that settlement can be better predicted by considering the fractal nature of particles. The particle size distribution and fractal dimension data measured by Malvern® laser scattering technique have been shown to be valuable data for in-depth understanding of the mechanisms of sewage solids sedimentation.
Keywords
Discrete settling; Flocculant settling; Laser scattering; Solids sedimentation mechanism; Suspended solids
Main Subjects
Particle size distribution; Sedimentation; sewage solids; Fractal dimension
References
1. Andreadakis, A. D., (1993). Physical and chemical properties of activated sludge floc. Water Res., 27 (12), 1707-1714 (8 Pages) Abstract | Full Text
2. Azema, N.; Pouet, M. F.; Berho, C.; Thomas, O., (2002). Wastewater suspended solids study by optical methods. Colloid Surface A., 204 (1), 131-140 (10 Pages), DOI: 10.1016/S0927-7757(02)00006-7. Abstract | Full Text (459 K)
3. Barbusinski, K.; Koscielniak, H., (1995). Influence of substrate loading intensity on floc size in activated sludge process. Water Res., 29 (7), 1703-1710 (8 Pages), DOI: 10.1016/0043-1354(94)00326-3. Abstract | Full Text (717 K)
4. Biggs, C. A.; Lant, P. A., (2000). Activated sludge flocculation: on-line determination of floc size and the effect of shear. Water Res., 34 (9), 2542-2550 (9 Pages), DOI: 10.1016/S0043-1354(99)00431-5. Abstract | Full Text (494 K)
5. Chaignon, V. ; Lartiges, B. S.; El Samrani, A.; Mustin, C., (2002). Evolution of size distribution and transfer of mineral particles between flocs in activated sludges: an insight into floc exchange dynamics. Water Res., 36 (3), 676-684 (9 Pages) Abstract | Full Text
6. Chavez, A.; Jimenez, B.; Maya, C., (2004). Particle size distribution as a useful tool for microbial detection. Water Sci. Tech., 50 (2), 179-186 (8 Pages) Abstract
7. Cho, S.; Michelangeli, D. V., (2008). Modeling study of the effects of the coagulation kernel with van der Waals forces and turbulence on the particle size distribution. Int. J. Environ. Sci. Tech., 5 (1), 1-10 (10 Pages) Abstract | Full Text (804 K)
8. Dulekgurgen, E.; Dogruel, S.; Karahan, O.; Orhon, D., (2006). Size distribution of wastewater COD fractions as an index for biodegradability. Water Res., 40 (2), 273-282 (10 Pages), DOI: 10.1016/S0043-1354(99)00431-5. Abstract | Full Text (326 K)
9. Gibson, J. H.; Hon, H.; Farnood, R.; Droppo, I. G.; Peter Seto, P., (2009). Effects of ultrasound on suspended particles in municipal wastewater. Water Res., 43 (8), 2251-2259 (9 Pages), DOI: 10.1016/j.watres.2009.02.024. Abstract | Full Text (539 K)
10. Guan, J.; Waite, T. D.; Amal, R.; Bustamante, H.; Ukasch, R., (1998). Rapid determination of fractal structure of bacteria assemblages in sewage treatment: Implications to process optimisation. Water Sci. Tech., 38 (2), 9-15 (7 Pages) Abstract | Full Text
11. Harikumar, P. S.; Nasir, U. P.; Mujeebu Rahman, M. P., (2009). Distribution of heavy metals in the core sediments of a tropical wetland system. Int. J. Environ. Sci. Tech., 6 (2), 225-232 (8 Pages) Abstract | Full Text (147 K)
12. Karapinar, I.; Kargi, F., (1996). Effect of particle number density on wastewater treatment performance of a fluidized-bed bioreactor. Enzyme Microb. Tech., 19 (2), 140-144 (5 Pages), DOI: 10.1016/0141-0229(95)00192-1. Abstract | Full Text (253 K)
13. Lagvankar, A. L.; Gemmel, R. S., (1968). A size-density relationship for flocs. J. Am. Water, Wks Assoc., 60, 1040-1046 (7 Pages)
14. Lawler, D. F.; O’Melia, C. R.; Tobiason, J. E., (1978). Integral water treatment plant design: particle size and plant performance. Particulates in water. American Chemical Society. , 353-388 (36 Pages)
15. Levine, A. D.; Tchobanoglous, G.; Asano T., (1991). Size distributions of particulate contaminants in wastewater and their impact on treatability. Water Res., 25 (8), 911-922 (12 Pages) Abstract
16. Li, D.; Ganczarczyk, J. J., (1993). Factors affecting dispersion of activated sludge flocs. Water Environ. Res., 65 (3), 258-263 (6 Pages) Abstract | Full Text
17. Lim, A. L.; Bai, R., (2003). Membrane fouling and cleaning in microfiltration of activated sludge wastewater. J. Membr. Sci., 216 (1-2), 279-290 (12 Pages), DOI: 10.1016/S0376-7388(03)00083-8. Abstract | Full Text (445 K)
18. Mandelbrot, B. B., (1982). The fractal geometry of nature. W. H. Freeman and Co Ltd.
19. Marquet, R.; Mietton-Peuchot, M.; Wheatley, A. D., (1999). Characterization of trickling filter effluent by particle size distribution and high performance size exclusion chromatography. Water Res., 33 (6), 1415-1424 (10 Pages)
20. Marquet, R.; Muhammad, N.; Vairavamoorthy, K.; Wheatley, A., (2007). Particle size distribution to assess the performance of trickling filters. Proc. Safe. Environ. Protec., 85 (1), 99-103 (5 Pages), DOI: 10.1205/psep.05194. Abstract | Full Text (205 K)
21. Metcalf and Eddy, (2002). Sewage engineering: Treatment and reuse. 4th. Ed. McGraw Hill Inc, , 405-407 (3 Pages)
22. Ofir, E.; Oren, Y.; Adin, A., (2007). Electroflocculation: The effect of zeta-potential on particle size. Desalination, 204 (1-3), 33-38 (6 Pages), DOI: 10.1205/psep.05194. Abstract | Full Text (205 K)
23. Pasztor, I.; Thury, P.; Pulai, J., (2009). Chemical oxygen demand fractions of municipal wastewater for modeling of wastewater treatment. Int. J. Environ. Sci. Tech., 6 (1), 51-56 (6 Pages) Abstract | Full Text (227 K)
24. Schubert, W.; Günthert, F. W., (2001). Particle size distribution in effluent of trickling filters and in humus tanks. Water Res., 35 (16), 3993-3997 (5 Pages), DOI: 10.1016/S0043-1354(01)00118-X. Abstract | Full Text (424 K)
25. Shimizu, Y.; Uryu, K.; Okuno, Y.; Sadami Ohtubo, S.; Atsuo Watanabe, A., (1997). Effect of particle size distributions of activated sludges on cross-flow microfiltration flux for submerged membranes. J. Ferment. Bioengin., 83 (6), 583-589 (7 Pages), DOI: 10.1016/S0922-338X(97)81141-5. Abstract | Full Text (750 K)
26. Shin, E. B.; Yoon, H. S.; Lee, Y. D.; Pae, Y. S.; Hong, S. W.; Joo, B. H., (2001). The effects of particle size distribution on the settleability of CSOs pollutants. Water Sci. Tech., 43 (5), 103-110 (8 Pages) Abstract
27. Spicer, P. T.; Pratsinis, S. E.; Raper, J.; Amal, R.; Bushell, G.; Meesters, G., (1998). Effect of shear schedule on particle size, density and structure during flocculation in stirred tanks. Powder Tech., 97 (1), 26-34 (9 Pages), DOI: 10.1016/S0032-5910(97)03389-5. Abstract | Full Text (830 K)
28. Stoller, M., (2009). On the effect of flocculation as pretreatment process and particle size distribution for membrane fouling reduction. Desalination, 240 (1-3), 209-217 (9 Pages), DOI: 10.1016/j.desal.2007.12.042. Abstract | Full Text (343 K)
29. Sui, J.; He, Y.; Karney, B. W., (2008). Flow and high sediment yield from the Huangfuchuan watershed. Int. J. Environ. Sci. Tech., 5 (2), 149-160 (12 Pages) Abstract | Full Text (183 K)
30. Tambo, N.; Watanabe, Y., (1979). Physical aspects of flocculation. I. The floc density function and aluminim floc. Water Res., 13 (5), 409-419 (11 Pages)
31. Wilen, B.; Balmer, P., (1999). The effect of dissolved oxygen concentration on the structure, size and size distribution of activated sludge flocs. Water Res., 33 (2), 391-400 (10 Pages), DOI: 10.1016/S0043-1354(98)00208-5. Abstract | Full Text (624 K)
32. Wilen, B.; Jin, B.; Lant, P., (2003). Impacts of structural characteristics on activated sludge floc stability. Water Res., 37 (15), 3632-3645 (14 Pages), DOI: 10.1016/S0043-1354(03)00291-4. Abstract | Full Text (1460 K)
33. Wisniewski, C.; Grasmick, A.; Leon Cruz, A., (2000). Critical particle size in membrane bioreactors: Case of a denitrifying bacterial suspension. J. Membr. Sci., 178 (1-2), 141-150 (10 Pages), DOI: 10.1016/S0376-7388(00)00487-7. Abstract | Full Text (354 K)
34. Zahid, W. M.; Ganczarczyk, J. J., (1990). Suspended solids in biological filter effluents. Water Res., 24 (2), 2150-220 (-1929 Pages), DOI: 10.1016/0043-1354(90)90105-F. Abstract | Full Text (522 K)