1. 1. 2. 3. 4. 5. © Effect Of Sinusoidal Perturbations Of Feed Concentration On Multi-Substrate Carbon Oxidation And Nitrification Process In An Upflow Packed-Bed Biofilm Reactor Beg, SA; Hassan, MM; Chaudhry, MAS ELSEVIER SCIENCE SA LAUSANNE, CHEMICAL ENGINEERING JOURNAL; pp: 165- 174; Vol: 65 King Fahd University of Petroleum & Minerals http://www.kfupm.edu.sa Summary The performance of an upflow packed bed biofilm reactor has been analyzed under multi-substrate limitation by considering simultaneous carbon oxidation and nitrification reactions. For an inlet concentration of 200 mg l(-1) of NH4+-N and 50 mg l(-1) of methanol, the results show that organic substrate is consumed very rapidly near the inlet of the reactor while most of the NH4+-N is converted in the central region of the reactor. When the inlet concentration of methanol is subjected to sinusoidal variation, the exit concentration of NH4+-N also follows a sinusoidal pattern although its inlet concentration was subjected to step input. However, the methanol exit concentration exhibits the typical step input response when the inlet NH4+-N concentrations subjected to sinusoidal variation. The concentration profiles within the biofilm reactor show that oxygen is a limiting component at the middle of the reactor when both methanol and NH4+-N inlet concentrations follow sinusoidal variation. (C) 1997 Elsevier Science S.A. References: ALEEM MIH, 1970, ANNU REV PLANT PHYS, V21, P67 ANTONIE RL, 1974, WAT SWG WKS, V121, P54 ANTONIE RL, 1974, WATER SEWAGE WORKS, V121, P44 ATIQULLAH M, 1990, CHEM ENG J, V44, B57 BARNES D, 1983, BIOL CONTROL NITROGE Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa

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3. 51. © ZINES DO, 1971, BIOTECHNOL BIOENG, V13, P293 For pre-prints please write to: abstracts@kfupm.edu.sa Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa