en aquaculture aquaculture پژوهشي Orginal research papers <p dir="ltr" style="text-align: justify">Many scientists have been studied on water quality and solid removal from Recirculating Aquaculture Systems (RAS), but the solid removal problem did not solve completely yet. This paper is based on experimental data on a cylindrical tank in diameter of 0.53 m and height of 0.17 m and inlet flow using six nozzles in 2 mm diameter to determine solid removal efficiency by comparison with some different scenarios. The results indicate that using submerged vanes on the bed of the tank may improve removal of solid particles. In this paper 10 different scenarios compared and some of them showed more effectiveness on solid removal. The number of submerged vanes in outer pyramid of the tank bed does not necessarily reduce amount of sediment discharge efficiency, and the location of each vane makes a special impact on the context of hydraulic conditions and solid removal as well. The experimental observations showed, the second scenario (12 submerged vanes in binary groups) and the third scenario (7 submerged vanes in 45&ordm; by the vicinity of the tank wall) have significant impacts on sediment discharge efficiency.</p> Settling pattern, Cylindrical tanks, Recirculating aquaculture systems, Hydraulic model, Fish feed. 1808 1817 http://jifro.ir/browse.php?a_code=A-10-1965-1&slc_lang=en&sid=1 M. Sajedi Sabegh m_sabegh@yahoo.com 100319475328460036111 100319475328460036111 Yes Aquaculture Department, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization, Tehran, Iran H.A. Abdolhay hossein_abdolhay@yahoo.com 100319475328460036112 100319475328460036112 No Aquaculture Department, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization, Tehran, Iran M. Saneie drsaneie@gmail.com 100319475328460036113 100319475328460036113 No Department of Rivers and Coastlines, Soil Conservation and Watershed Management Research Institute, Tehran, Iran A. Matinfar a_matinfar@hotmail.com 100319475328460036114 100319475328460036114 No Aquaculture Department, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization, Tehran, Iran Sh. Behmanesh 100319475328460036115 100319475328460036115 No Inland WatersAquacultureResearchCenter,Iranian Fisheries Science Research Institute,Agricultural Research Education and Extension Organization, BandarAnzali,Iran