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http://dx.doi.org/10.11001/jksww.2013.27.4.495

Evaluation of hydraulic dead-zone and particle removal efficiency in the base frame of a constructed wetland using computational fluid dynamics  

Choi, Young-Gyun (Department of Environmental Engineering, Daegu University)
Park, Min-Cheol (Department of Environmental Engineering, Daegu University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.27, no.4, 2013 , pp. 495-502 More about this Journal
Abstract
Hydraulic dead-zone and particle removal efficiency in the base frame of a constructed wetland was evaluated with computational fluid dynamics (CFD). The fraction of hydraulic dead-zone was estimated to be 1.2-2.1 % (v/v) and it was attributed to the artificial islands developed in the constructed wetland. Solids deposition rate could be increased with higher hydraulic retention time (HRT, ranged from 2.2 to 4.2 hr) of the wetland and larger particle size (ranged from 10 to $50{\mu}m$) in the influent. Experimental results showed that the volume concentration of the particles smaller than $10{\mu}m$ in diameter was varied from $1.99{\times}10^3{\mu}m^3/ml$ (HRT 12.8 hr) to $3.92{\times}10^3{\mu}m^3/ml$(HRT 2.2 hr) in the influent of the constructed wetland. With the effluent volume concentration data, removal efficiency of those particles was calculated to be 71.2 and 24.7 % when the HRT was 12.8 and 2.2 hr, respectively. Similar trend with the HRT variation could be identified with CFD analysis.
Keywords
computational fluid dynamics; constructed wetland; hydraulic dead-zone; solids deposition rate;
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1 Hayes D.F., Olin T.J., Fischenich J.C. and Palermo M.J. (2000) Wetlands Engineering Handbook, ERDC/EL TP-WRP-EW21, U.S. Army Corps of Engineers: Washington, D.C., p. 719.
2 Cho Y. J., Lee J.H., Bang K.W. and Choi C.S. (2007) Water quality and particle size distributions of bridge road runoff in storm event, J. KSEE, 29(12), pp. 1353-1359.   과학기술학회마을
3 Choi D .H., Choi K.S., Kim S.W., Oh Y.T., Kim D.S., Joh S.J. and Park J.C. (2007) Water flow distribution and sedimentation characteristics of particle materials in the Sihwa constructed wetland, J. KSEE, 29(4), pp. 425-437.   과학기술학회마을
4 Choi, J .Y. (2008) Efficiency increases for artificial wetlands to reduce nonpoint source pollution, Kyonggi Forum, 10(2), pp. 163-181.
5 Hannoun I.A., Bouls F. and List J. (1998) Using hydraulic modeling to optimize contact time, J. AWWA, 90(8), pp. 77-87.
6 Jang J .R., Lee K.S., Choi S.H. and Choi J.H. (2004) The characteristics of pollutant removal of a free water surface constructed wetland established at estuary reclamation are, Proceedings of 2004 Joint Conference by KSWW & KSWE, pp. 16-24.
7 Koskiaho J. (2003) Flow velocity retardation and sediment retention in two constructed wetland-ponds, Ecologic. Eng., 19(5), pp. 325-337.   DOI   ScienceOn
8 Lim Y. J. and Lee D.G. (2007) A study on the various water environments using particle size distribution measurement-Focused on river water, lake water and sea water, Proceedings of 2005 Joint Conference by KSWW & KSWE, pp. 81-89.
9 Lee H. S. (2008) Runoff characteristics of stormwater runoff in urban area, M.S. Thesis, Kumoh National Institute of Technology.
10 Lee S. J., Shin E.H., Kim S.H. and Park H.K. (2007) The effect of dead zone o hydraulic efficiency in clearwell, J. KSWW, 21(2), pp. 177-185.
11 Li Y., Deletic A. and Fletcher T.D. (2007) Modelling wet weather sediment removal by stormwater constructed wetlands: Insights from a laboratory study, J. of Hydrology, 338(3-4), pp. 285-296.   DOI   ScienceOn
12 Reed, S.C., Crites, R.W., and Middlebrooks E.J. (1995) Natural systems for waste management, 2nd ed., McGraw-Hill, New York, USA, pp. 173-284.
13 Urban D.T. (1990) Methods of determining residence time distribution in a reconstructed wetland, M.S. Thesis, Illinois istitute of technology, pp. 69-72.
14 U.S. EPA (2000) Constructed wetlands treatment of municipal wastewaters, EPA/ 625/R-99/010.
15 Walker D.J. (1998) Modelling residence time in stormwater ponds, Ecologic. Eng., 10(3), pp. 247-262.   DOI   ScienceOn
16 Kadlec R.H., Bastiaens W. and Urban D.T. (1993) Constructed wetland for water quality improvement: Hydrological design of free water surface treatment wetlands, Lewis Publishers, pp. 77-82.
17 Thackston E.L, Shields Jr.F., Douglas Jr. and Schroeder P.R. (1987) Residence time distributions of shallow basins, J. Environ. Eng., 113(6), pp. 1319-1332.   DOI   ScienceOn