03555cas|a2200421 i 4500 20260818113040.0 150399s1990 th uzm rtt 00| a1eng d .b10074156 AIT Thesis no. EV-90-21 Arora, Sanjay An experimental investigation of mechanism and operating conditions of multi stage reversing flow bioreactor in treating domestic wastewater Bangkok : Asian Institute of Technology, 1990 107 p. Thesis ; no. EV-90-21 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1990 Multi Stage Reversing Flow Bioreactor (MRB) uses new biological interaction among sulfur bacteria for organic substrate removal under biological environments different from aerobic and anaerobic. The biological interaction between sulfate reducing bacteria and sulfide oxidising bacteria is responsible for COD and SS removal from wastewater. An experimental study to determine mechanism and operating conditions of MRB was carried out. Batch experiment and microscopic observations were taken to support the mechanism of MRB. Performance of MRB under three different hydraulic conditions was studied and effect of organic loading and wastewater recycle was also studied. Organic substrate removal was due to aerobic metabolism in aeration vessels and due to sulfur metabolism in biological vessels. Only about 1% of total COD removal was due to methanogenesis in biological vessels and assimilation of sulfur microorganisms was the main mechanism responsible for COD removal . Yield coefficient of MRB process was found to vary between 0.1-0 .2. At flow rate of 0.78 l/min (upflow velocity 73 m/day) 85-90 % of COD removal efficiency was achieved and effluent SS was between 15-20 mg/l. At flow rate of 1.17 l/min (upflow velocity 109 m/day) , without recycle 70-80 % of COD removal efficiency was obtained and SS was between 30-40 mg/l. However with recycling of wastewater 84- 88 % of COD removal efficiency was achieved even at a flow rate of 1.17 l / min. Sewage Purification Biological treatment Mino, Takashi, Chairperson Chongrak Polprasert, Examination Committee Verink, Johan, Examination Committee Harada, Hideki, Examination Committee The Royal Norwegian Government (Norade Scholarship), Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-90-21 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B18374 .b10074156 mnait x 240410 2 951012 m a x 3 mnait mnait mnarc 20 40 Barcode : 30050003045688 CREATED : 1994-05-16 RECORD # : i10073498 LPATRON : 1018328 LCHKIN : 2005-01-12 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050003045696 CREATED : 1994-05-16 RECORD # : i10073504 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120222855 CREATED : 2016-11-05 RECORD # : i12974183 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 42073 42073 0 0 0 0 MAIN MAIN mnait 2026-08-18 10.00 0 AIT Thesis no. EV-90-21 30050003045688 2026-08-18 11:30:40 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 10.00 0 AIT Thesis no. EV-90-21 30050003045696 2026-08-18 11:30:40 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. EV-90-21 30050120222855 2026-08-18 11:30:40 2026-08-18 40