04382nam a2200409 4500 20260817172215.0 120399s1988 th r 0000|00eng d .b1012861x AIT Thesis no. EV-88-10 Baskaran, Kanagaratnam Carbon oxidation-nitrification in attached growth activated sludge process Bangkok : Asian Institute of Technology, 1988 100 p. Thesis ; no. EV-88-10 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, 1988 Laboratory experiments were carried out on Attached Growth Activated Sludge Process (AGASP) with volume of attached-growth media in the aeration tank varied at 5%, 10%, and 15% of the aeration tank volume. Different organic loadings (F /M ratio) and different solid retention time(9 ) of the reactors were operated to investigate the c process kinetics and process efficiency. The experiments were carried out in three phases. In the first phase, the 9 were varied from 5 days c to 20 days at a constant organic loading of 0. 3 kg COD/ (kg MLSS. d). In the second phase the optimum 9 was fixed while the organic loadings c were varied from 0. 3 to 1. 0 kg COD/ (kg MLSS. d). Synthetic waste (sodium acetate and ammonium sulfate as main ingredients for carbon and nitrogen sources) was utilized as feed. The hydraulic retention time(9) and influent NH3 -N concentration were maintained at 8 hours and 65 mg/L, respectively, throughout the first two phases of experiments. In the third phase the 9 and the Organic Loading were fixed c at 10 days and 0.3 kg COD/(kg MLSS.d), respectively while the in fluent NH3 -N concentration was increased to 100 mg/L . Experimental results from the first phase revealed that the 9 c of 10 days in all AGASP reactors provided the optimum process efficiency with respect to Carbonaceous and nitrogenous compound removal. At this 9c the carbon (COD) removal was 97% and NH3 -N concentration in the effluent was not detectable. In the second phase, complete NH3 -N removal was observed in the AGASP reactors with 5% and 10% media at organic loadings between 0.3 - 1.0 kg COD/(kg MLSS . d). The COD removal in all four reactors we re between 94% - 98%. In third phase, when the AGASP reactors were fed with a high strength nitrogenous waste (NH3 -N = 100 mg/L). The AGASP reactor with 15% media gave t he optimum NH3 -N removal efficiency of 95%. The experimental results obtained suggested that the installation of 10% media in the aeration tank of an activated sludge reactor will provide a high degree of COD and NH3 -N removal. AGASP with 10% media was found to produce an effluent which should effluent standards when operated at organic 1 . 0 kg COD/(kg MLSS.d) . satisfy most stringent loadings be tween 0.3 - A mathematical model established based on a comination of MONOD expression and diffusion equation could predict the effluent quality of t h e AGASP . Sewage Purification Activated sludge process Chongrak Polprasert, Chairperson I, Fude, Examination Committee Vigneswaran, Saravanamuthu, Examination Committee The Roya l Netherland Government, Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-88-10 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B18880 .b1012861x mnait x 240411 2 951012 m a x 0 mnait mnait mnarc 20 40 Barcode : 30050003044319 CREATED : 1994-05-16 RECORD # : i1014531x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003044327 CREATED : 1994-05-16 RECORD # : i10145321 LPATRON : 1010167 LCHKIN : 1998-01-25 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050120223556 CREATED : 2016-10-05 RECORD # : i12973464 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 15209 15209 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no. EV-88-10 30050003044319 2026-08-17 17:22:15 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no. EV-88-10 30050003044327 2026-08-17 17:22:15 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. EV-88-10 30050120223556 2026-08-17 17:22:15 2026-08-17 40