Article: Process intensiﬁcation in wastewater treatment: oxygen transfer characterisation of a jet loop reactor for aerobic biological wastewater treatment Journal: International Journal of Environmental Technology and Management (IJETM) 2004 Vol.4 No.3 pp.220 - 235 Abstract: The overall volumetric mass transfer coefficient (KLa) and the overall gas holdup (ε) were measured in a jet loop reactor (JLR) used for the intensive aerobic biological treatment of waste water. The process parameters and their ranges were: inlet water flow rate: 30 &#le; QL &#le; 70 l/min, inlet air flow rate: 4 &#le; Qg &#le; 36 l/min. The ratio of water flow rates from the bottom of the reactor (QB) and the inlet water flow rate (QL) varied in the range 0.0 &#le; QB/QL &#le; 0.92. It was found that, both KLa, and ε increased with increasing Qg. Up to a critical Qg value, neither KLa nor ε varied with energy dissipation rate per unit volume, E/V, but beyond these Qg values, KLa decreased while ε increased with increasing E/V. Water withdrawal from the bottom of the reactor in addition to that from the top, increased KLa up to 30% depending on the process conditions. Use of pure oxygen instead of air could also lead to increases in KLa up to 19%. Inderscience Publishers - linking academia, business and industry through research

Title: Process intensiﬁcation in wastewater treatment: oxygen transfer characterisation of a jet loop reactor for aerobic biological wastewater treatment

Authors: B. Keskinler, G. Akay, T. Pekdemir, E. Yildiz, A. Nuhoglu

Addresses: Process Intensification and Miniaturization Centre, School of Chemical Engineering and Advanced Materials, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK. ' Process Intensification and Miniaturization Centre, School of Chemical Engineering and Advanced Materials, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK. ' Department of Mechanical and Chemical Engineering, Heriot Watt University, Edinburgh EH14 4AS, UK. ' Faculty of Engineering, Ataturk University, 25240 Erzurum, Turkey. ' Faculty of Engineering, Ataturk University, 25240 Erzurum, Turkey

Abstract: The overall volumetric mass transfer coefficient (K_La) and the overall gas holdup (ε) were measured in a jet loop reactor (JLR) used for the intensive aerobic biological treatment of waste water. The process parameters and their ranges were: inlet water flow rate: 30 &#le; Q_L &#le; 70 l/min, inlet air flow rate: 4 &#le; Q_g &#le; 36 l/min. The ratio of water flow rates from the bottom of the reactor (Q_B) and the inlet water flow rate (Q_L) varied in the range 0.0 &#le; Q_B/Q_L &#le; 0.92. It was found that, both K_La, and ε increased with increasing Q_g. Up to a critical Q_g value, neither K_La nor ε varied with energy dissipation rate per unit volume, E/V, but beyond these Q_g values, K_La decreased while ε increased with increasing E/V. Water withdrawal from the bottom of the reactor in addition to that from the top, increased K_La up to 30% depending on the process conditions. Use of pure oxygen instead of air could also lead to increases in K_La up to 19%.

Keywords: gas hold-up; jet loop reactor; mass transfer; oxygen transfer; process intensification; wastewater treatment; water treatment; water quality.

DOI: 10.1504/IJETM.2004.005583

International Journal of Environmental Technology and Management, 2004 Vol.4 No.3, pp.220 - 235

Published online: 21 Oct 2004 *

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Title: Process intensiﬁcation in wastewater treatment: oxygen transfer characterisation of a jet loop reactor for aerobic biological wastewater treatment

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