Premium
The role of interphase nitrogen transport in the dynamic measurement of the overall volumetric mass transfer cefficient in air‐sparged systems
Author(s) -
Linek V.,
Beneš P.,
Hovorka F.
Publication year - 1981
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260230206
Subject(s) - interphase , aeration , nitrogen , mass transfer , oxygen , chemistry , sulfite , bubble , analytical chemistry (journal) , mass transfer coefficient , chromatography , mechanics , inorganic chemistry , genetics , physics , organic chemistry , biology
It has been shown both theoretically and experimentally that interphase nitrogen transport may have a significant influence on the rate of interphase oxygen transport, and thereby also on the value of the volumetric mass transfer coefficient of oxygen, k l a , determined in mechanically agitated bubble fermentors using the variants of dynamic method presented in the literature. The experiments were carried out in 1 M KCI solution at five stirrer frequencies and two gas inlet levels. The gas interchanges were performed either without interrupting the aeration and agitation of the charge (A) or with the aeration and agitation of the charge turned on at the same time (B). The applied variants of the interchange were N 2 → O 2 →, O 2 → N 2 , N 2 → air, air→ N 2 , O→ O 2 , and O→ air. In the two last variants the oxygen dissolved in the charge was removed by reacting with sulfite ions. The k l a values calculated by allowing for the nitrogen transport for procedure A were approximately equal to the values obtained by disregarding the nitrogen transport, whereas those for procedure B were higher (up to 40%), than the values obtained disregarding the nitrogen transport.