03138cas|a2200421 i 4500 20260818133522.0 011298s1987 th uzm rtt 00| a1eng d .b10331074 AIT Thesis no. EV-87-28 Chongchin Polprasert High-rate denitrification using upflow filter Bangkok : Asian Institute of Technology, 1987 60 p. Thesis ; no. EV-87-28 A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1987 The upflow filters were operated to study the denitrification process with respect to the effects of substrates corresponding to different M/N ratios and time over the treatment efficiency. Over 95% of denitrification efficiency was achieved even if M/N ratio was as low as 2. 5; but the optimum M/N ratio for packed-column denitrification was found to be equal to 2 .9. The unit also satisfied the treatment of high loading, of which nitrate-N and methanol concentrations in feed were respectively 200 and 600 mg/L, with a 4 -hr HRT. The gas chromatographic results showed that denitrification and methane production happened together. Since the methane production was found to occur in a proportion to COD loading even with only 1.5-hr HRT, resulting in a low COD effluent, it is proposed that an additional post aeration, after an upflow packed-bed denitrifying unit, would not be required. It was found that the granular biomass was, not only attached to the media surface, but also densely entrapped within the void space. This formation would result in a better treatment efficiency, due to much higher ' self' surface areas for more attachment. The bio-granules were found to contain 50% of volatile solids. Nitrification Filters and filtration Hanaki, K., Chairperson Orth, Hermann M., Examination Committee Vigneswaran, Saravanamuthu, Examination Committee The Royal Danish Government, Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-87-28 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B19251 .b10331074 mnait x 240402 2 951012 m a x 0 mnait mnait mnarc 20 40 Barcode : 30050003044087 CREATED : 1994-05-17 RECORD # : i10411471 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003044095 CREATED : 1994-05-17 RECORD # : i10411483 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120223671 CREATED : 2016-10-05 RECORD # : i12973324 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 55013 55013 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. EV-87-28 30050003044087 2026-08-18 13:35:22 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. EV-87-28 30050003044095 2026-08-18 13:35:22 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. EV-87-28 30050120223671 2026-08-18 13:35:22 2026-08-18 40