03366cas|a2200385 i 4500 20260818223233.0 170399s1993 th uzm rtt 00| a1eng d .b10651901 AIT Thesis no.EV-93-11 Fuangfa Boonyarat Study on nitrogen removal strategies in wastewater treatment plants by theoretical analysis and numerical simulation Bangkok : Asian Institute of Technology, 1993 135 leaves + 1 online resource Thesis ; no. EV-93-11 A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering Thesis (M.Eng.) - Asian Institute of Technology, 1993 This study was carried out to study the nitrogen removal efficiency of anoxic-oxic activated sludge processes. The theoretical analysis and numerical simulation were conducted and compared with the data from wastewater treatment plants from published papers. The key components of influent wastewater considered in the theoretical nitrogen removal efficiencies are ammonia nitrogen, substrate for denitrification process, and alkalinity for nitrification process. The theoretical results show that in the sufficient conditions of these components the nitrogen removal efficiencies of : 1) anoxic and oxic system, depend on the return sludge ratio from the final sedimentation tank and return mixed liquor, and 2) step-feed system, depend on the return sludge ratio from the final sedimentation tank and the portion of influent to the second anoxic tank. The ammonia nitrogen and substrate in the influent and effluent from published papers of anoxic-oxic activated sludge wastewater treatment plants have been reported . From the theoretical analysis of these components for nitrogen removal efficiencies, generally the substrates are enough to perform denitrification process. The results from the theoretical analysis of the nitrogen removal efficiencies compare well with the data from published papers. A mathematical model, which is able to simulate carbon oxidation with nitrification-denitrification process, was used to simulate the data of wastewater treatment plants from published papers. The simulation results indicated that the removal efficiency of total nitrogen can consist with the published papers. Sewage Purification Nitrogen removal Fujii, Shigeo, Chairperson Lee, Seong-Key, Examination committee Tanaka, Shuzo, Examination committee Electricity Generating Authority of Thailand (EGAT), Thailand, Scholarship donor Asian Institute of Technology. Thesis ; no. EV-93-11 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B16212 .b10651901 mnait x 240401 2 951012 m a x 0 mnait mnarc 22 40 Barcode : 30050120806178 CREATED : 2014-03-28 RECORD # : i12781988 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160055850 CREATED : 2016-11-05 RECORD # : i12975035 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 115256 115256 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-93-11 30050120806178 2026-08-18 22:32:33 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-93-11 30050160055850 2026-08-18 22:32:33 2026-08-18 40