Process intensification in wastewater treatment: oxygen transfer characterisation of a jet loop reactor for aerobic biological wastewater treatment
by B. Keskinler, G. Akay, T. Pekdemir, E. Yildiz, A. Nuhoglu
International Journal of Environmental Technology and Management (IJETM), Vol. 4, No. 3, 2004

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%.

Online publication date: Thu, 21-Oct-2004

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