Hydrodynamic studies in an airlift reactor with an enlarged degassing zone

被引:45
作者
Freitas, C [1 ]
Teixeira, JA [1 ]
机构
[1] Univ Minho, Dept Engn Biol, Inst Biotecnol & Quim Fina, P-4709 Braga, Portugal
关键词
D O I
10.1007/s004490050441
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
The hydrodynamic behaviour of a 60 l three-phase airlift bioreactor, of the concentric draught tube type, with an enlarged degassing zone has been studied. Ca-alginate beads were used as the solid phase. Airflow rate (from 1.9 to 90.2 l/min), solids loading (0% to 40% (v/v)) and solids density (1016 and 1038 kg/m(3)) were manipulated and their influence on solids and gas holdup, circulation and mixing times and in the interstitial liquid velocity was determined. Riser and downcomer solids holdup was found to decrease with the increase of airflow rate and to increase with solids loading and density. On the contrary, gas holdup in the riser and in the downcomer increased with airflow rate and decreased with solids loading and density. By increasing airflow rate, a decrease pi in circulation time was observed while the effects of solids loading and density were negligible. Mixing time decreased with airflow rate, increased with solids density, in the studied range, and presented a maximum for solids loading of approximately 20% (v/v).
引用
收藏
页码:267 / 279
页数:13
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