03200cas|a2200409 i 4500 20260818100059.0 230399s1993 th uzm rtt 00| a1eng d .b10248316 AIT Thesis no.EV-93-22 Maung Maung Soe Enhancement of river self-purification systems using the rock bed filtration method Bangkok : Asian Institute of Technology, 1993 70, [32] leaves + 1 online resource Thesis ; no. EV-93-22 A thesis submitted in partial fulfilment of the requirement for the degree of Master of Engineering Thesis (M.Eng.) - Asian Institute of Technology, 1993 All natural water environment e. g. rivers, has a self-purification capacity which help improve their quality through reduction of BOD and recovery of DO, when some pollutants are discharged into them. Rock bed filtration is one of such methods to enhance the self-purification capacity of rivers and other water resources. Two pilot-scale rock bed reactors were constructed and experiments were carried out using two types of rock media with under two conditions of non-aeration and aeration systems. In the non-aeration system, two parallel filters were separately filled with broken bricks in the first reactor and whole bricks in the second reactor at a mean BOD loading of 22 g BOD/m2.d of first reactor and 18 g BOD/m2.d of second reactor. After two months operation, both rock bed reactors were supplied with the aeration inside and at the bottom of the reactor at a mean BOD loading of 16 g BOD/m2.d of first reactor and 17 g BOD/m2.d of second reactor. The experimental results revealed that the rock bed reactor with aeration system showed an over-all superiority in purification efficiency as compared with the non-aeration system. It can be concluded that, the rock bed filtration method is a low-cost and least-maintenance technique to treat the moderately-polluted water. Water Purification Filtration Fujii, Shigeo, Chairperson Murthy, D.V.S., Examination committee Lee, Seong-Key, Examination committee Deutscher Akademischer Austauschdienst (DAAD), Scholarship donor Asian Institute of Technology. Thesis ; no. EV-93-22 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B16671 .b10248316 mnait x 240401 2 951012 m a x 0 mnait mnait mnarc 20 40 Barcode : 30050003047346 CREATED : 1994-05-17 RECORD # : i10304988 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003047353 CREATED : 1994-05-17 RECORD # : i1030499x LPATRON : 1015952 LCHKIN : 2002-03-07 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 6 TOT RENEW : 0 Barcode : 30050160055769 CREATED : 2016-11-05 RECORD # : i1297514x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 38414 38414 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no.EV-93-22 30050003047346 2026-08-18 10:00:59 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no.EV-93-22 30050003047353 2026-08-18 10:00:59 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-93-22 30050160055769 2026-08-18 10:00:59 2026-08-18 40