PH influence on oxygen mass transfer coefficient in a bubble column. Individual characterization of kL and a

• Type: Article in International Scientific Journal
• Date: 2013

Authors

A. Ferreira (Author) FEUP; P. Cardoso (Author) Other; J. A. Teixeira (Author) Other; F. Rocha (Author) FEUP

Journal

Title: Chemical Engineering Science

Vol. 100

Pages: 145-152

ISSN: 0009-2509

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 32 Citations

Scopus - 34 Citations

INSPEC

Associated Projects

UI0511 - PROJECTO ESTRATÉGICO - UI 511 - 2013-2014

Other information

Authenticus ID: P-006-83K

DOI: 10.1016/j.ces.2013.02.020

Abstract (EN): Experiments were performed in a laboratory scale bubble column (10 L), to investigate the pH influence on oxygen mass transfer coefficient, in order to achieve a better control of biological processes. The liquid-side mass transfer coefficient, kL, and the specific interfacial area, a, were studied individually. The specific interfacial area was obtained using the new automatic image analysis technique developed by Ferreira et al. (2012). The pH was changed by the addition to the system of the most common acids and base used in biological process: hydrochloric acid (HCl), phosphoric acid (H3PO4) and potassium hydroxide (KOH). The results show that aqueous systems containing HCl, H3PO4 or KOH present lower volumetric liquid side mass transfer coefficient, kLa, in relation to pure systems (distilled water), this decrease being not linear. It was found that the specific interfacial area presents higher values in KOH and HCl solutions in comparison with distilled water. However, an opposite behavior was observed in the liquid-side mass transfer coefficient values. The kL behavior on the impure systems was explained based on bubble surface contamination. Higbie’s and Froessling’s equations were adapted in the ¨ present work in order to be used in bubble dispersion systems.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8