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

Lookup NU author(s): Dr Bulent Keskinler, Professor Galip Akay, Dr Turgay Pekdemir


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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 ≤ QL ≤ 70 l/min, inlet air flow rate: 4 ≤ Qg ≤ 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 ≤ Q B/QL ≤ 0.92. It was found that, both KLa, and ε increased with increasing Qg. Up to a critical Q g 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%.

Publication metadata

Author(s): Keskinler B, Akay G, Pekdemir T, Yildiz E, Nuhoglu A

Publication type: Article

Publication status: Published

Journal: International Journal of Environmental Technology and Management

Year: 2004

Volume: 4

Issue: 3

Pages: 220-235

Print publication date: 01/01/2004

ISSN (print): 1466-2132

ISSN (electronic): 1741-511X

Publisher: Inderscience Publishers