03000nam a2200397 4500 20260818144927.0 271098s1981 th r 0000|00eng d .b10389167 AIT Thesis no.EV-81-17 Chalermraj Thanantaseth Kinetic model of biological oxidation in rotating biological contactors Bangkok : Asian Institute of Technology, 1981 vi, 64 p. Thesis ; no. EV-81-17 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, 1981 The major problem of the treatment efficiency for nitrification is the existence of BOD5 in the wastewater. The model was developed to explain the phenomena occurring in the rotating biological contactor unit base on the property of substrate diffusion and the degree of zero order biological reaction within the biofilm. The active biofilm are divided into outer layer of heterotrophic and inner layer of nitrifying microorganism due to lower diffusion coefficient but higher biological reaction of organic carbonaceous substrate than the ammonia-nitrogen, and so, the nitrification rate will depend on the oxygen and ammonia-nitrogen concentration, on the nitrifying surface, left from the heterotrophic utilization. Experiments with low influent BOD5 concentration were carried on to prevent oxygen limitation in the heterotrophic layer and to be able to observe the reduction of oxygen penetration into the nitrifying layer. The experimental variables were hydraulic loading, influent BOD5, and the type of organic carbonaceous material. Experimental results show that higher BOD5/N ratio together with higher hydraulic loading caused the lowering in nitrification rate. These were adequate explained by the proposed model. Sewage Purification Rotating disc process Sewage Purification Nitrogen removal Watanabe, Yoshimasa, Chairperson Nguyen, Cong Thanh, Co-Chaiperson Samorn Muttamara, Examination Committee Royal Danish Government, Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-81-17 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B21614 .b10389167 mnait x 250106 2 951012 m a x 0 mnait mnarc 22 40 Barcode : 30050120655765 CREATED : 2014-04-02 RECORD # : i12756222 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160084652 CREATED : 2016-04-05 RECORD # : i12968614 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 67218 67218 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-81-17 30050120655765 2026-08-18 14:49:27 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-81-17 30050160084652 2026-08-18 14:49:27 2026-08-18 40