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Characteristics and Control of Microthrix Parvicella Bulking in Biological Nutrient Removal Plant  

Lee, H. (Department of Environmental Engineering, Chungju National University)
Ahn, K. (National Institute of Environmental Research)
Publication Information
Journal of Korean Society on Water Environment / v.22, no.6, 2006 , pp. 1101-1106 More about this Journal
Abstract
Many BNR (Biological Nutrient Removal) plants have experienced a bulking problem, mainly due to the growth of filamentous organisms, particularly during the winter months. This study investigated the problem of bulking due to the growth of M. parvicella both at a full-scale municipal wastewater treatment plant and a pilot scale plant located in the C city. The full-scale facility was operated at a flow rate of $51,000m^3/d$, an F/M (Food-to-Microorganism) ratio of 0.12 kgBOD/kgMLVSS/d and an SRT (Solids Retention Time) higher than 25 days, respectively. This plant experienced bulking and foaming problems at low temperatures below $15^{\circ}C$ since it was retrofitted with the BNR system in 2003. The pilot plant employed had an identical process configuration as the full scale one and used the same wastewater source. It was operated at a flow rate of $3.8m^3/d$, temperatures between 10 to $25^{\circ}C$ and SRTs between 10 and 25 days. At full scale, the M. parvicella growth and SVI (Sludge Volume Index) patterns were studied in conjunction with temperature variations. At pilot scale, DO and SRT variations were also explored, in addition to the filamentous bacteria growth and SVI patterns. During the full-scale investigation, over a 3 year period, it was noted that the SVI was maintained within acceptable operational values (i.e. under 160) during the summer months. Moreover settling in the secondary clarifiers was good and was not affected by the presence of M. parvicella. In contrast, at low mean temperatures during winter, the SVI increased to over 300. Overall, as the temperature decreased, the predominance of M. parvicella became apparent. According to this study, M. parvicella growth could be controlled and SVI could drop under 160 by a change in operational conditions which involved an increase in DO concentration between 2 and 4 mg/L and a decrease in SRT to less than 20 days.
Keywords
Biological nutrient removal; Bulking and foaming; Dissolved oxygen; Filamentous growth; Solids retention time; Temperature;
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  • Reference
1 APHA, AWWA, WEF, Standard Methods for the Examination of Water and Wastewater (1995)
2 Ekama, G. A. and Marais, G. v. R., The Implication of the IAWPRC Hydroylsis Hypothesis on Low F/M Bulking, Wat. Sci. Tech., 18, p. 1119 (1986)
3 Jenkins, D., Richard, M. G. and Daigger, G. T., Manual on the Causes and Control of Activated Sludge Bulking and Foaming, 2nd ed., Lewis Publishers (1993)
4 Noutsopoulos, C., Mamais, D. and Andreadakis, A. D., The Effect of Reactor Configuration and Operational Mode on M. parvicella Bulking and Foaming in Nutrient Removal Activated Sludge Systems, Wat. Sci. Tech., 46(1-2), pp. 61-64 (2002)
5 Ahn, K., The Causes of M. parvicella in Biological Nutrient Removal Systems, MSc. Thesis, Chungju National University, Korea (2005)
6 Ministry of Environment of Korea, The Status of Advanced Municipal Wastewater Treatment Plants in Korea, 2005 Report (2005)
7 Pujol, R. and Canler, J. P., Cohtact Zone: French Practise with Low F/M Bulking Control, Wat. Sci. Tech., 29(7), pp. 221-228 (1994)
8 Westlund, A. D., Hagland, E. and Rothman, M., Foaming in Anaerobic Digesters Caused by M parvicella, Wat. Sci. Tech., 37(4-5), pp. 51-55 (1998)
9 Lee, H., Performance Characteristics of BNR Systems for Low Strength Municipal Wastewater, Ph. D. Thesis, Korea University, Korea (1995)
10 Metcalf & Eddy, Wastewater Engineering Treatment and Reuse 4th ed., McGraw-Hill (2005)
11 Andreasen, K. and Nielsen, P. H., In situ Characterization of Substrate Uptake by M. parvicella Using Microautoradiography, Wat. Sci. Tech., 37(4-5), pp. 19-26 (1998)
12 Mamais, D., Andreadakis, A., Noutsopoulos, C. and Kalergis, C., Causes and Control Strategies for M. parvicella Bulking and Foaming in Nutrient Removal Activated Sludge Systems, Wat. Sci. Tech., 37(4-5), pp. 9-17 (1998)
13 Eikelboom, D. H., Andreadakis, A. and Andreasen, K., Survey of Filamentous Populations in Nutrient Removal Plants in Four European Countries, Wat. Sci. Tech., 37(4-5), pp. 281-289 (1998)   DOI
14 Choi, E., Waste Treatment and Resource, Cheongmoongak, Korea (2003)