Mechanisms of Fouling in Fine‐Pore Diffuser Aeration
Publication: Journal of Environmental Engineering
Volume 119, Issue 6
Abstract
Diffuser fouling is classified as one of three types, A, B, and C, based on the nature of the foulant. The accumulation of inorganic foulants, such as fine particles and precipitates, characterize type A fouling, and the formation of biomass‐characterize type B fouling. Type C fouling is characterized by the formation of biofilm, fortified by the entrapment of inorganic particles within the biomass. Hypotheses were developed to describe the mechanisms of dynamic change in diffuser operating performance as a result of the three different types of diffuser fouling. The hypotheses specific to each type were evaluated by testing the appropriate hypothetical equations using the data produced in this study. Results indicate that the physical properties of the biofilm are important factors in fouling, causing a significant change in diffuser characteristics. Entrapment of inorganic particles, such as sands, within the biofilm, significantly increase the dynamic wet pressure (DWP) and alter the bubble size. The association between DWP and bubble size could be quantitatively described by a hypothetical fouling equation for the three different types of fouling in these laboratory studies.
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References
1.
Absolom, D. R., Lamberti, F. V., Policova, Z., Zingg, W., van Oss, C. J., and Neuman, A. (1983). “Surface thermodynamics on the attachment of a marine Pseudomonad to solid surfaces.” App. Env. Microbiol., 37, 67–72.
2.
Alkema, T. (1983). “Slime growth on ceramic fine bubble dome diffusers.” Sem. Proc. High Efficiency Aeration in Wastewater Treatment, Canadian Institute of Energy, Toronto, Ontario, Canada.
3.
Barnhart, E. L. (1969). Transfer of oxygen in aqueous solutions, J. Sanit. Engrg. Div., ASCE, 95(3), 645–661.
4.
Benzing, R. J., and Myers, J. E. (1955). “Low frequency bubble formation at horizontal circular orifices.” Ind. Engrg. Chem., 47, 2087–2090.
5.
Boyd, A., and Maconnachie, E. (1981). “Morphological correlations with dimensional change during SEM specimen preparation.” Scanning Electron Microscopy, IV, 27–34.
6.
Danly, W. B. (1984). “Biological fouling of fine bubble diffusers—Plase I,” M.S. report, Dept. of Civ. and Environ. Engrg., Univ. of Wisconsin‐Madison, Madison, Wis.
7.
Eckenfelder Jr., W. W. (1959). “Absorption of oxygen from air bubbles in water.” J. Sanit. Engrg. Div., ASCE, 85(4), 89–99.
8.
“Fine pore aeration systems.” (1989). EPA/625/1‐89/023. U.S. Environmental Protection Agency, Washington, D.C.
9.
Hartley, K. J., and Gobbie, M. R. (1990). “Fouling and cleaning of fine bubble ceramic dome diffusers,” Urban Water Research Association of Australia.
10.
Kim, Y. (1990). “Mechanisms and effects of fouling in fine pore ceramic diffuser aeration,” PhD thesis, Dept. of Civ. and Envir. Engrg., Univ. of Wisconsin‐Madison, Madison, Wis.
11.
Marshall, K. C., Stout, R., and Mitchell, R. (1971). “Mechanism of the initial event in the sorption of marine bacteria to surfaces.” J. Gen. Microbiol., 68, 337–348.
12.
Montgomery, S. B., and Wolf, P. R. (1986). “Mensuration system for small format, non‐metric analytical photogrammetric applications.” Am. Soc. for Photogrammetry and Remote Sensing, Proc., 4, 127–133.
13.
Morgan, P. F. (1959). “Clogging studies of fine bubble diffuser media.” Sewage Ind. Wastes, 31, 153–163.
14.
Rieth, M. G., Boyle, W. C., and Ewing, L. (1990). “Effects of selected design parameters on the fouling characteristics of ceramic diffusers.” Res. J. Water Poll. Cont. Fed., 62, 877–886.
15.
Standard methods for the examination of water and wastewater. (1985). 15th Ed., American Public Health Association, Washington, D.C.
16.
“Summary report: fine pore (fine bubble) aeration systems.” (1985). EPA/625/8‐85/010. U.S. Environmental Protection Agency, Washington, D.C.
17.
van Krevelen, D. W., and Hoftijer, P. J. (1950). “Studies of gas‐bubble formation.” Chem. Engrg. Progress, 46, 29–35.
18.
Wisely, W. H. (1943). “Summary of experience in diffuser air activated sludge plant operation.” Sewage Works J., 15, 909–936.
19.
ZoBell, C. E. (1943). “The effect of solid surfaces upon bacterial activity.” J. Bacteriol., 46, 39–56.
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Copyright © 1993 American Society of Civil Engineers.
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Received: Jul 6, 1992
Published online: Nov 1, 1993
Published in print: Nov 1993
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