Abstract
Particle size distribution (PSD) allows more accurate simulations of filtration models and better understanding of filter performance. PSD in municipal activated sludge effluent filtration is determined, varying filtration rate, grain size, flocculant type and dosage and function parameters are examined in this work. Results show, that removal efficiency varies for different size groups: small particles in the range of 5-10 μm in initialization stage, with no chemical aids, are poorly removed. Higher rate filters were more sensitive to the particle size than lower rate filters. Filtration with chemical aids is more sensitive to filtration conditions than filtration with no chemical additions. Particle size distribution in filtrate generally fits power law function behavior better than in raw effluent. The treatment smoothens the function somewhat in a similar manner to the effect of settling in tanks or in natural lakes. Degree of correlation to power law function may indicate the mode of filter operation: high - working stage, low - breakthrough stage. β may also reflect on filters performance: high values - initial filtration stages. Decrease in β values - cycle progress towards breakthrough. Low β values, with low PSD correlation to power law function, may indicate low filtration efficiency or breakthrough.
Original language | English |
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Pages (from-to) | 217-224 |
Number of pages | 8 |
Journal | Water Science and Technology |
Volume | 36 |
Issue number | 4 |
DOIs | |
State | Published - 1997 |
Event | Proceedings of the 1996 IAWQ/IWSA Joint Group on Particle Separation, 4th International Conference on the Role of Particle Characteristics in Separation Processes - Jerusalem, Isr Duration: 28 Oct 1996 → 30 Oct 1996 |
Keywords
- Deep-bed filters
- Filtration
- Particle size distribution
- Tertiary treatment
- Water reuse