03283nam a2200385 4500 20260818090321.0 130598 th eng .b11511485 AIT Thesis no. AE-95-31 Hossain, Alamgir Designing a filtration system for partially trapping suspended solids from fish ponds Bangkok : Asian Institute of Technology, 1995 109 leaves + 1 online resource Thesis ; no. AE-95-31 A thesis submitted in partial fulfi llment of the requirement for the degree of Master of Engineering, School of Environment, Resources, and Development Thesis (M.Eng.) - Asian Institute of Technology, 1995 A horizontal flow prefiltration system, a rotating drum filtration unit and a combination of prefilter and rotating drum units were developed for removing turbidity and algae from pond water. The main objectives of the study were to determine methods for the reduction of si1t and plankton turbidity and to harvest excess plankton from fish ponds at different flow rates and different turbidity concentrations. The inf1uent turbidity concentration, flow rates, fi1tering materials and sizes have been found to be factors affecting the turbidity reduction for both individual and combined media. For pond water sources 2 of high turbidity up to 252 NTU, the optimum flow rate was found to be 0.15 m /m - hr for 1. 7 - 12. 7 mm crushed stone as individual filter media. The optimum flow rate for 25 æm screen to remove algae waf 1. 15 m /m2 - hr as individual filter media. The combination of flow rates3 of 9.15 m /m -hr t through stone and synthetic material, and flow rate of 2.15 m / m - hr through micro screen were found optimum to remove plankton, and mixture of plankton and silt turbidity. It is concluded from this study that horizontal flow prefilter system using crus hed stone is found to be very effective in removing silt turbidity at minimum flow condition. The combined filter media of micro screen and coarse media of crushed stone and synthetic material are found very efficient in removing suspended solids of plankton, and si 1 t and plankton together at high and low flow rates from pond water Fish ponds Yakupitiyage, Amararatne, Chairperson Visvanathan, C., Co-Chairperson Little, David C., Examination Committee The Government of Bangladesh and Asian Development Bank (ADB), Scholarship donor Asian Institute of Technology. Thesis ; no. AE-95-31 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B15214 .b11511485 mnait v 240405 0 960710 m a v 0 mnait mnarc 22 14 Barcode : 30050120578207 CREATED : 2014-02-18 RECORD # : i12765818 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120372049 CREATED : 2016-02-06 RECORD # : i13012022 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 27659 27659 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no. AE-95-31 30050120578207 2026-08-18 09:03:21 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. AE-95-31 30050120372049 2026-08-18 09:03:21 1 2026-08-18 14