Experiments on Efficiency Review of New-Type Screens for Waste Treatment in the Drainage Canal

Yoon, J.-S.; Park, J-H.; Cho, Y.K.; Ha, T., and Lee, J.H., 2019. Experiments on efficiency review of new-type screens for waste treatment in the drainage canal. In: Lee, J.L.; Yoon, J.-S.; Cho, W.C.; Muin, M., and Lee, J. (eds.), The 3rd International Water Safety Symposium. Journal of Coastal Research, Special Issue No. 91, pp. 266-270. Coconut Creek (Florida), ISSN 0749-0208. Drainage canals installed for irrigation in farms are helplessly exposed to reckless garbages and municipal wastes. In addition, according to “Design Standards for Agricultural Drainage (2012)” of the Korean Ministry of Agriculture, Food and Rural Affairs, drainage canals with inlet flow below 5 m3/sec cannot use dust collectors, causing issues related to treatment of municipal wastes that accumulate in drainages. This study proposed a method of collecting municipal wastes by installing a separate dust collecting canal and screen in drainage canals as an alternative solution to these issues, and their efficiency was analyzed by a hydraulic model test. The hydraulic model test analyzed hydraulic characteristics according to different shapes (screen installation angle, screen blade angle) of screen I in the main drainage canal and the clogging of screen II in the dust collecting canal. The effect of collecting municipal wastes entering into the dust collecting canal was reviewed by applying the LS-PIV (Large Scale Particle Image Velocimetry) technique. Result of the hydraulic model test, highest efficiency was shown when length of screen I became longest with installation angle of 15° and blade angle of 30°. The concerned back-water phenomenon did not occur.