000 03555cas|a2200421 i 4500
005 20260818113040.0
008 150399s1990 th uzm rtt 00| a1eng d
035 _a.b10074156
099 9 _aAIT Thesis no. EV-90-21
100 1 _aArora, Sanjay
245 1 3 _aAn experimental investigation of mechanism and operating conditions of multi stage reversing flow bioreactor in treating domestic wastewater
260 _aBangkok :
_bAsian Institute of Technology,
_c1990
300 _a107 p.
490 1 _aThesis ;
_vno. EV-90-21
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1990
520 _aMulti 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.
650 0 _aSewage
_xPurification
_xBiological treatment
700 1 _aMino, Takashi,
_eChairperson
700 0 _aChongrak Polprasert,
_eExamination Committee
700 1 _aVerink, Johan,
_eExamination Committee
700 1 _aHarada, Hideki,
_eExamination Committee
710 2 _aThe Royal Norwegian Government (Norade Scholarship),
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. EV-90-21
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B18374
907 _a.b10074156
_bmnait
_cx
902 _a240410
998 _b2
_c951012
_dm
_ea
_fx
_g3
945 _lmnait
945 _lmnait
945 _lmnarc
942 _c20
942 _c40
909 _aBarcode : 30050003045688
_bCREATED : 1994-05-16
_cRECORD # : i10073498
_dLPATRON : 1018328
_eLCHKIN : 2005-01-12
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 1
_jTOT RENEW : 0
909 _aBarcode : 30050003045696
_bCREATED : 1994-05-16
_cRECORD # : i10073504
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
909 _aBarcode : 30050120222855
_bCREATED : 2016-11-05
_cRECORD # : i12974183
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
999 _c42073
_d42073