01884nam a2200253   450000500170000000800410001703500150005810000280007324500780010126000520017930000100023149000260024150001520026750200580041952007630047765000470124065000230128770000370131070000490134770000450139671000660144181000580150785600650156520260817161800.0011298s1985    th      r    0000|00eng d  a.b100580601 aIllangovan, Patchamuthu10aAerobic biological treatment by fluidized bed :ban experimental approach  aBangkok :bAsian Institute of Technology,c1985  a55 p.1 aThesis ;vno. EV-85-9  aA thesis submitted in partial fulfillment of requirements for the degree of Master of Engineering, School of Environment, Resources and Development  aThesis (M.Eng.) - Asian Institute of Technology, 1985  aAn aerobic tapered fluidized bed reactor was measured in terms of organic removal efficiency and dissolved oxygen concentration maintained in the reactor. The uniqueness about this process is the combined activity of suspended and attached growth microorganisms in organic removal. Attached growth microorganism were predominant in the fludized sand media while suspended growth microorganisms were dominant in the portion above the expanded bed in the reactor. The study show moderate organic carbon removal efficiency (45-50%) at low concentration dissolved oxygen 9.9-10.2 mg/l and low detention time of 1.8-2.3 min. It can be deduced from the study that the organic carbon removal efficiency is dependent upon the influent dissolved oxygen concentration. 0aSewagexPurificationxBiological treatment 0aFluidized reactors1 aNguyen, Cong Thanh,eChairperson1 aVigneswaran, Saravanamuthu, eCo-Chairperson0 aSamorn Muttamara,eExamination Committee2 aNorwegian Agency for Development (NORAD), eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. EV-85-9  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B20008