03754cas|a2200421 i 4500 20260818090843.0 170399s1991 th uzm rtt 00| a1eng d .b10199743 AIT Thesis no. EV-91-26 Kim, Jeong-hun Development of high efficient nitrification process by microfiltration (MF) membrane bioreactor Bangkok : Asian Institute of Technology, 1991 79 p. Thesis ; no. EV-91-26 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, 1991 Three identical small scale membrane bioreactors were operated in parallel to investigate the effect of the ratio of N/COD in the Influent on the nitrification performance. The NH4+-N concentration of the influent was fixed at 400 mg/l varying the COD concentration of that with 0, 1000 mg/l and 2000 mg/l for reactor 1, 2 and 3, respectively. The continuous experiments were conducted for 110 days varying nitrogen loading from 0.6 to 2.4 gNH-i+-N/l.d. The reactors were operated at pH 7.0-7.8 and very long sludge retention time with intermittent feeding mode to examine microfiltration efficiency and maximum allowing nitrogen loading as well as the effect of the activity of heterotrophs on nitrification Clogging did not occur when biological solids were retained in the reactor at a lower concentration. Serious clogging did occur at higher loadings in the reactor retaining a higher solid concentration. The result clearly indicate that the addition of organic matter, which provokes the growth of heterotrophs, inhibits nitrification because of loss of ammonia for assimilation of heterotrophs. Ammonia utilization rate, k, determined in batch experiments was 4. 14d- 1 when no glucose was added. The addition of glucose to the reactor resulted in a low k (2.50d- 1 and 2.30d-1 ) and 0.097 and 0.036 of the ratio of nitrifies to total biomass when the ratio of N/COD were 2.5 and 5.0, respectively. It is suggested that inhibition takes place by crowded cells of heterotrophs on nitrification. A nitrification rate of 2.51 gNH4+-N/l.d was attained with 88.1% of nitrification efficiency. More than 10% and 25% of the oxidized nitrogen in the reactors were denitrified at the same time when 1000 mg/l and 2000 mg/1 of COD were added, respectively. Sewage Purification Activated sludge process Nitrification Harada, Hideki, Chairperson Kim Sun-Il, Examination Committee Mino, Takashi, Examination committee DAAD, Federal Republic of Germany, Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-91-26 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B17417 .b10199743 mnait x 240329 2 951012 m a x 0 mnait mnait mnarc 20 40 Barcode : 30050003046322 CREATED : 1992-12-17 RECORD # : i10240299 LPATRON : 1029121 LCHKIN : 2019-10-08 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 3 TOT RENEW : 2 Barcode : 30050160056346 CREATED : 2016-11-05 RECORD # : i12974560 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121074867 CREATED : 2023-03-20 RECORD # : i13439224 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 29335 29335 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. EV-91-26 30050003046322 2026-08-18 09:08:43 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. EV-91-26 30050160056346 2026-08-18 09:08:43 2026-08-18 40 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no. EV-91-26 30050121074867 2026-08-18 09:08:43 2 2026-08-18 20