Estimate of Floc Permeability
| Autor: | G.W. Tsou, 鄒建偉 |
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| Rok vydání: | 2000 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 88 In this study two non-destructive methods were utilized to determine the permeability of sludge flocs. First we measured the velocity change of a sludge floc approaching a plate. Second the flow filed around a settling floc was determined by tracing bubbles passing through the sludge floc. The experimental results were compared with the simulation using commercial software FIDAP. In first experiment, the velocity change of floc approaching a plate was measured. Dimensionless permeability was deter- mined by comparing with the experimental results with the simulation using FIDAP. The results revealed that the addition of the polymer flocculant did not change the dimensionless permeability, while freeze/thawed floc had a larger dimensionless permeability. The cupric hydroxide sludge floc had an even larger dimensionless permeability than that of the activated sludge floc. The shear effect would further lower down its permeability and increase dimensionless per- meability. The structure became more compact accordingly. In second experiment, the bubble generated from electrolysis was passed through the settling floc. Deviations from their original streamlines were first determined, and then dimension- less permeability could be obtained according to the procedure proposed by Adler (1981). The results were compared with the simulation of FIDAP and they correlated well. Furthermore, dimensionless permeabilityobtained from this experiment was consistent with the previous one. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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