The cultivation of Anabaena variabilis in a bubble column operating under bubbly and slug flows.
In a bubble column reactor with an inner diameter of 6cm and a height of 63cm for the culture of cyanobacteria two different shapes of bubbles can be generated, resulting in bubbly flow or slug flow. Growth of Anabaena variabilis under slug flow (1.9g/l/day) was 1.73 times higher than that under bubbly flow (1.1g/l/day) when the specific irradiation rate was maintained above 10μmol/s/g dry cell. Although a stepwise increase in superficial gas velocity enhanced the average cell growth rate under bubbly flow by 1.57 times, the average cell growth rate during the deceleration phase under bubbly flow (1.98g/l/day) was 0.61 times smaller than that under slug flow (3.22g/l/day). These results demonstrate that the bubble shape in the slug flow was advantageous in regards to the radial circulation of cells.
School of Chemical and Biological Engineering, Bio-MAX Institute, Seoul National University, Seoul 151-744, Republic of Korea.
Jong Hyun
JH
Yoon
Shin Sik
SS
Choi
Tai Hyun
TH
Park
D046870:Anabaena variabilis / Q000254:growth & development* / Q000378:metabolism; D008027:Light; D010860:Pigments, Biological
D010860:Pigments, Biological