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

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

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The overall volumetric mass transfer coefficient (KLa) and the overall gas holdup (e) 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 e increased with increasing Qg. Up to a critical Q g value, neither KLa nor e varied with energy dissipation rate per unit volume, E/V, but beyond these Qg values, KLa decreased while e 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%.

Original languageEnglish
Pages (from-to)220-235
Number of pages16
JournalInternational Journal of Environmental Technology and Management
Volume4
Issue number3
Publication statusPublished - 2004

Keywords

  • Gas hold-up
  • Jet loop reactor
  • Mass transfer
  • Oxygen transfer
  • Process intensification
  • Waste water
  • Water treatment

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