Gravitational Settling Velocity Regimes for Heterodisperse Urban Drainage Particulate Matter
Publication: Journal of Environmental Engineering
Volume 137, Issue 1
Abstract
Gravitational settling regimes, most commonly discrete (Type I) or flocculent (Type II) can be hindered (Type III) in unmaintained urban drainage appurtenances. In coastal zones or in areas with deicing salt applications, high salinity may influence particulate matter (PM) settling. This study examines settling of PM with a heterodisperse particle size distribution (PSD); typical of urban runoff. For Type I settling at low concentration , Newton’s and logarithmic matching models each predict measured settling velocity for PM from . For Type I in runoff, PM diameter dominates the influence of PM density, fluid temperature and salinity parameter ranges. Integrating Type I across a common heterodisperse PSD for regulatory testing, a physically validated computational fluid dynamics model of a baffled hydrodynamic separator (HS) illustrates the influence of parameters as PM . Event-based PM separation by a screened HS loaded by unsteady flows and heterodisperse PSDs is predicted by overflow rate, and integrating measured (or validated Newton’s Law) , flow and PSD data. For Type II settling, is a first-order function of PM concentration (1, 2, and 3 g/L); as well as time and settling depth. Type III is modeled as a power law function of PM concentration. Across the PSD tested, salinity up to 30 ppt does not have a significant (at ) role on Type I . However, salinity is significant (at ) in Type II settling; as well as for Type III settling below 120 g/L. For all regimes, PM concentration, PSD heterodispersivity, and time dominate salinity or temperature influences.
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References
ASTM. (1994). “Standard test method for specific gravity of soil particulate matter by gas pycnometer.” ASTM D5550-94, West Conshohocken, Pa.
ASTM. (1998). “Standard test method for particle-size analysis of soils.” ASTM D422-63, West Conshohocken, Pa.
Baba, J., and Komar, P. D. (1981). “Settling velocities of irregular grains at low Reynolds numbers.” J. Sediment. Petrol., 51(1), 121–128.
Barth, T. J., and Jespersen, D. (1989). “The design and application of upwind schemes on unstructured meshes.” Proc., AIAA 27th Aerospace Sciences Meeting, Reno, Nev.
Brown, P., and Lawler, D. (2002). “Sphere drag and settling velocity re-visited.” J. Environ. Eng., 129(3), 222–231.
Cheng, N. S. (1997). “Simplified settling velocity formula for sediment particle.” J. Hydraul. Eng., 123(2), 149–152.
Cristina, C., Tramonte, J., and Sansalone, J. J. (2002). “A process design selection methodology for separation of traffic-generated sediments in snowmelt runoff.” Water, Air Soil Pollut., 136(5), 33–53.
Cristina, C. M., and Sansalone, J. J. (2003). “‘First Flush,’ power law and particle separation diagrams for urban storm-water suspended particulates.” J. Environ. Eng., 129(4), 298–307.
Dickenson, J., and Sansalone, J. J. (2009). “Discrete phase model representation of particulate matter (PM) for simulating PM separation by hydrodynamic unit operations.” Environ. Sci. Technol., 43(21), 8220–8226.
Di Felice, R. (1996). “A relationship for the wall effect on the settling velocity of a sphere for any flow regime.” Int. J. Multiphase Flow, 22(3), 527–533.
Di Felice, R., and Parodi, E. (1996). “Wall effects on the sedimentation velocity of suspensions in viscous flow.” AIChE J., 42(4), 927–931.
Droppo, I., Walling, D., and Ongley, E. (2000). “Influence of floc size, density and porosity on sediment and contaminant transport.” The role of erosion and sediment transport in nutrient and contaminant transfer, 263, 141–147.
Droste, R. L. (1997). Theory and practice of water and wastewater treatment, Wiley, New York.
Fidleris, V., and Whitmore, R. L. (1961). “Experimental determination of the wall effect for spheres falling axially in cylindrical vessels.” Br. J. Appl. Phys., 12, 490–494.
Field, R., Pitt, R., Brown, M., and O’Connor, T. (1995). “Combined sewer overflow control using storage in seawater.” Water Res., 29(6), 1505–1514.
Grizzard, T. L., Randall, C. W., Weand, B. L., and Ellis, K. L. (1986). “Effectiveness of extended detention ponds.” Urban runoff quality: Impact of quality enhancement technology, ASCE, New York, 323–337.
Guo, J. (2002). “Logarithmic matching and its applications in computational hydraulics and sediment transport.” J. Hydraul. Res., 40(5), 555–565.
Hawley, N. (1982). “Settling velocity distribution of natural aggregates.” J. Geophys. Res., 87(12), 9489–9498.
Hazen, A. (1904). “On sedimentation.” Trans. ASCE, 43, 45–71.
Jiang, Q., and Logan, B. (1991). “Fractal dimensions of aggregates determined from steady-state size distribution.” Environ. Sci. Technol., 25(12), 2031–2038.
Jimenez, J. A., and Madsen, O. S. (2003). “A simple formula to estimate settling velocity of natural sediments.” J. Waterway, Port, Coastal Ocean Eng., 129(2), 70–78.
Kim, J. Y., and Sansalone, J. (2008a). “Event-based size distributions of particulate matter transported during urban rainfall-runoff events.” Water Res., 42(10), 2756–2768.
Kim, J. Y., and Sansalone, J. (2008b). “Suspended particle destabilization in retained urban runoff as a function of coagulant dosage and redox condition.” Water Res., 42(4–5), 902–922.
Kim, J. Y., and Sansalone, J. (2008c). “Zeta potential of clay-size particles in urban rainfall-runoff during hydrologic transport.” J. Hydrol., 356(1–2), 163–173.
McCave, I. N. (1975). “Vertical flux of particles in the ocean.” Deep-Sea Res., 22, 491–502.
Metcalf, L., and Eddy, H. (1916). American sewerage practice, disposal of sewage, Vol. III, McGraw-Hill, New York.
Metcalf, L., and Eddy, H. (2003). Wastewater engineering: Treatment and reuse, McGraw-Hill, Boston.
Michaels, A., and Bolger, J. (1962). “Settling rates and sediment volumes of flocculated kaolin suspensions.” Ind. Eng. Chem. Fundam., 1(1), 24–33.
Michelbach, S., and Wöhrle, C. (1993). “Settleable solids in a combined sewer system, settling characteristics, heavy metals, efficiency of storm water tanks.” Water Sci. Technol., 27(5–6), 153–164.
Middleton, J. R., and Barrett, M. E. (2008). “Water quality performance of a batch-type stormwater detention basin.” Water Environ. Res., 80(2), 172–178.
Mitchell, J. K., and Soga, K. (2005). Fundamentals of soil behavior, 3rd Ed., Wiley, Hoboken, N.J.
Morsi, S. A., and Alexander, A. J. (1972). “An investigation of particle trajectories in two-phase flow systems.” J. Fluid Mech., 55(2), 193–208.
Nowakowski, A. F., Cullivan, J. C., Williams, R. A., and Dyakowski, T. (2004). “Application of CFD to modeling of the flow in hydrocyclones—Is this a realizable option or still a research challenge.” Minerals Eng., 17, 661–669.
Patankar, S. (1980). Numerical heat transfer and fluid flow, 1st Ed., Hemisphere Publishing Corporation, New York, 126–131.
Pathapati, S., and Sansalone, J. (2009). “CFD modeling of a storm-water hydrodynamic separator.” J. Environ. Eng., 135(4), 191–202.
Pisano, W. C. (1996). “Summary: United States ‘sewer solids’ settling characterization methods, results, uses and perspective.” Water Sci. Technol., 33(9), 109–115.
Pisano, W. C., and Brombach, H. (1996). “Solids settling curves: Wastewater solids data can aid design of urban runoff controls.” Water Envir. Tech., 8(4), 27–33.
Pisano, W. C., Connick, D. J., and Aronson, G. L. (1984). “Swirl and helical bend regulator/concentrator for storm and combined sewer overflow control.” EPA-600/2-84/151 (NTIS PB85-102 523), U.S. EPA, Cincinnati.
Ranade, V. V. (2002). Computational flow modeling for chemical reactor engineering, 1st Ed., Academic, London.
Reynolds, T. D., and Richards, P. A. (1996). Unit operations and processes in environmental engineering, 2nd Ed., PWS, Boston.
Rodi, W. (1993). Turbulence models and their application in hydraulics—A state of the art review, 3rd Ed., IAHR, Delft, The Netherlands.
Sansalone, J., Koran, J., and Smithson, J. (1998). “Physical characteristics of urban roadway solids transported during rain event.” J. Environ. Eng., 124(5), 427–440.
Sansalone, J. J., and Glenn, D. W. (2002). “Accretion and partitioning of heavy metals associated with snow exposed to urban traffic and winter storm maintenance activities: Part I.” J. Environ. Eng., 128(2), 151–166.
Sansalone, J. J., and Kim, J. (2008). “Transport of particulate matter fractions in urban source area pavement surface runoff.” J. Environ. Qual., 37(5), 1883–1893.
Schulz, S., Wilde, R., and Albertson, M. (1954). “Influence of shape on the fall velocity of sedimentary particles.” M.R.D. Sediment Ser. No. 5 (CER54EFS6), Missouri River Div., USACE, Colorado Agricultural & Mechanical College, Fort Collins, Colo.
Sha, Y. Q. (1956). “Basic principles of sediment transport.” J. Sediment. Res., 1(2), 1–54.
Sheng, Y., Ying, G., and Sansalone, J. (2008). “Differentiation of transport for particulate and dissolved water chemistry load indices in rainfall-runoff from urban source area watersheds.” J. Hydrol., 361(1–2), 144–158.
Sonntag, H., Strenge, H. K., and Vincent, B. (1987). Coagulation kinetics and structure formation, Plenum Publishing Corporation, New York.
Swamee, P. K., and Ojha, C. S. (1991). “Drag coefficient and fall velocity of non-spherical particles.” J. Hydraul Eng., 117(5), 660–667.
Tyack, J., Hedges, P., and Smisson, R. (1996). “Relationship between settling velocity gradients and characteristics of the contributing catchment.” Water Sci. Technol., 33(9), 135–142.
U.S. EPA. (1983). “Results of the nationwide urban runoff program.” WH-554, Water Planning Div., Washington, D.C.
U.S. EPA. (1986). “Methodology for analysis of detention basins for control of urban runoff quality.” EPA440/5-87-001, Office of Water, Washington, D.C.
Van Wachem, B. G. M., and Almstedt, A. E. (2003). “Methods for multiphase computational fluid dynamics.” Chem. Eng. J., 96, 81–98.
Versteeg, H., and Malalasekera, W. (1995). Introduction to computational fluid dynamics: Finite volume method approach, 1st Ed., Prentice-Hall, London.
Vesilind, P. A. (1979). “Sludge treatment, utilization and disposal.” J. Water Pollut. Control Fed., 51(6), 1214–1223.
Whipple, W., and Hunter, J. V. (1980). “Detention basin settleability of urban runoff pollution.” Final Technical Completion Rep. Prepared for Project No. A-058-NJ, Water Resources Research Institute, Rutgers Univ., New Brunswick, N.J.
Wilson, B. N., and Barfield, B. J. (1985). “Modelling sediment detention ponds using reactor theory and advection diffusion concepts.” Water Resour. Res., 21(4), 523–532.
Wong, K. B., and Piedrahita, R. H. (2000). “Settling velocity characterization of aquacultural solids.” Aquacultural Eng., 21, 233–246.
Ying, G., and Sansalone, J. (2008). “Granulometric relationships for urban source area runoff as a function of hydrologic event classification and sedimentation.” Water Air Soil Pollut., 193(1–4), 229–246.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 137 • Issue 1 • January 2011
Pages: 15 - 27
Copyright
© 2011 ASCE.
History
Received: Sep 7, 2009
Accepted: Jun 25, 2010
Published online: Jun 29, 2010
Published in print: Jan 2011
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