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The Effect of Column Height on Sludge-Water Interface Height Change Model  

Park, Suk Gyun (광운대학교 환경공학과)
Kang, Seon-Hong (광운대학교 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.20, no.2, 2006 , pp. 265-272 More about this Journal
Abstract
While sludge settles down in a column, sludge settling characteristic is influenced by effect parameters, interparticle force, wall effect etc. As the height of a column changes, the settling velocity of sludge-water interface changes, too. At lower sludge concentration, particular effect was not observed by the difference of column height, however it was observed that settleability of sludge was greatly influenced by column height when sludge settling was poor or sludge concentration was high. It is therefore required to consider the effect of column height when the power model for sludge interface settling is established. In the tests, there was hardly any $SVI_{ts}$(SVI after "t" minutes) difference in each column after 10min at $1.5kg/m^3$ of sludge concentration. When sludge concentration was at $2.5kg/m^3$, $SVI_{ts}$ tended to be constant after 20min. At $3.5kg/m^3$, $SVI_{ts}$ increased to 30minuets. The purpose of this work is to establish the correction factor that is able to compensate the errors derived from each different height of column.
Keywords
Sludge Settling; Settling Velocity; Column Height; Sludge Interface; Correction Factor;
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  • Reference
1 Marcos, V. S. and Carala, M. V. F. (1999), Determination of the required surface area for activated sludge final clarifiers based on a unified database, Wat. Res. 33, pp. 1884-1894   DOI   ScienceOn
2 Pitman, A. R. (1984), Settling of nutrient removal activated sludges. Water Science and Technology 17, pp. 493-504
3 박석균, 강선홍 (2006b), 슬러지계변층높이모델에서 슬러지침전특성에 대한 영향, 상하수도학회지, 20(1), pp.147-155
4 Wahlberg, E. J. and Keinath, T. M. (1995), Development of settling flux curves using SVI: an addendum. Water Environment Research, 67, p. 872   DOI
5 Daigger, G. T. (1995), Development of refind clarifier operating diagrams using an updated settling characteristics database. Water Environment Research 67(21), pp. 95-100   DOI
6 Dick, R.I. and Ewing, B.B. (1967), Evaluation of activated sludge thickening theories. J. San. Eng. Div. ASCE, 93, SA4, Proc. Paper 5367, pp. 9-29
7 Christopher, M. B. and Peter, L. D. (1998), Sludge Volume index Settleability measure: effect of solids characteristic and test parameter, Wat. Env. Res. 70, pp. 87-93   DOI   ScienceOn
8 박석균, 강선홍 (2006a), Batch column에서의 슬러지계면층 높이 변화예측, 상하수도학회지, 20(1), pp.156-163
9 Daigger, G. T. and Roper, R. E., Jr. (1985), The relationship between SVI and activated sludge settling characteristics. Journal Water Pollution Control Federation, 57(8), pp. 859-866
10 Koopman, B., and Cadee, K. (1983), Prediction of Thickening Capacity Using Diluted Sludge Volume Index. Water Res. (G.B.), 17, p. 1427   DOI   ScienceOn