A method for measuring sludge settling characteristics in turbulent flows

Water Research

Volumn 30, Issue 10, 1996, Pages 2363-2370

  Rasmussen, Michael R ^a   Larsen, Torben ^a  

^a AALBORG UNIVERSITY   (Denmark)

Author keywords

Activated sludge; Flocculation; Modelling; Settling; Turbulence

Indexed keywords

ACTIVATED SLUDGE; ARTICLE; FLOCCULATION; MODEL; PRIORITY JOURNAL; SLUDGE SETTLING; STEADY STATE; TURBULENT FLOW; WASTE WATER MANAGEMENT;

CALCULATIONS; FLOCCULATION; MATHEMATICAL MODELS; SETTLING TANKS; TURBULENCE; TURBULENT FLOW; VELOCITY; VELOCITY MEASUREMENT;

ACTIVATED SLUDGE; MASS BALANCE; SETTLING COLUMN;

SEWAGE SLUDGE;

SETTLING; SLUDGE; TURBULENT FLOW;

EID: 0030251082     PISSN: 00431354     EISSN: None     Source Type: Journal    
DOI: 10.1016/0043-1354(96)00145-5     Document Type: Article

References (21)

1. Bache D. H., Ali A. and McGilligan J. F. (1995) Floc character: measurement and role in optimum dosing. J. Water SRT - Aqua 44(2), 83-92.
2. Batchelor G. K. (1959) The theory of homogeneous turbulence. Cambridge monographs on mechanics and applied mathematics. Cambridge University Press.
3. Camp T. R. and Stein P. C. (1943) Velocity gradients and internal work in fluid motion. J. Soc. Civ. Eng. 30, 219-237.
4. Casson L. W. and Lawler D. F. (1990) Flocculation in turbulent flow: Measurement and modeling of particle size distribution. J. Am. Water Works Assoc. 63(8), 54-68.
5. Cleasby J. L. (1984) Is velocity gradient a valid flocculation parameter? J. Environ. Eng. 110(5), 875-897.
6. Dahl C. (1995) Numerical Modelling of Flow and Settling in Secondary Settling Tanks, Ph.D. Thesis, Aalborg University, Department of Civil Engineering, Series Paper no. 8.
7. Delft Hydraulics (1991) Manual for OSLIM, an optical silt measuring instrument. Delft, The Netherlands.
8. Dupont R. and Dahl C. (1995) A one-dimensional model for a secondary settling tank including density current and short-circuiting. Wat. Sci. Tech. 31(2), 215-224.
9. Hopfinger E. J. and Toly J.-A. (1976) Spatially decaying turbulence and its relation to mixing across density interfaces. J. Fluid Mech. 78, 155-175.
10. Keulegan G. H. and Carpenter L. H. (1958) Forces on Cylinders and Plates in a Oscillating Fluid. J. Res. Nat. Bur. Stand 60(5), 423-440.
11. Li D. and Ganczarczyk J. J. (1987) Stroboscopic determination of settling velocity, size and porosity of activated sludge flocs. Water Res. 21, 257-262.
12. Matsunaga N., Sugihara Y. and Komatso T. (1991) A numerical simulation of oscillating-grid turbulence by using the k-e turbulence model. Proc. Environmental hydraulics (Edited by Lee J. H. W. and Cheung). A. A. Balkema Publishers, Rotterdam, Brookfield.
13. Morison J. R., O'Brien M. P., Johnson J. W. and Schaff S. A. (1950) The force exerted by surface waves on piles. Petrol. Trans., AIME 189, 149-157.
14. Owen M. W. (1970) A detailed study of settling velocities of an estuary mud. Report No. INT 78, Hydraulics Research Station, Wallingford.
15. Parker D. S., Kaufman W. J. and Jenkins D. (1971). Physical conditioning of activated sludge floc. J. WPCF 43(9), 1817-1833.
16. Rasmussen M. R., Larsen T. and Clauss F. (1996) Improving settling dynamics of activated sludge by adding fine talc powder. Accepted to IA WQ 18th Biennial International Conference, Singapore.
17. Sarpkaya T. and Isaacson M. (1981) Mechanics of wave forces on Offshore structures, Van Nostrand Reinholdt Company Inc.
18. Smollen M. and Ekaman G. A. (1984) Comparison of empirical settling velocity equations in flux theory for secondary settling tanks. Water S. A. 10, 175.
19. Thomson S. M. and Turner J. S. (1975) Mixing across an interface due to turbulence generated by an oscillating grid. J. Fluid Mech. 67, 349-368.
20. Vesilind A. P. (1969) The use and misuse of the Sludge Volume Index V ANN 1, 69.
21. Vesilind A. P. (1968) Discussion of "Evaluation of Activated Sludge Thickening Theories" by R. I. Dick and B. B. Eving. J. Sanit. Engng Div., ASCE 94, SA 1.