期刊
BIOTECHNOLOGY AND BIOENGINEERING
卷 119, 期 12, 页码 3549-3566出版社
WILEY
DOI: 10.1002/bit.28232
关键词
bioreactor; compartment model; feed point; industrial biotechnology; mixing time; scale-up
资金
- Tampere University of Technology Graduate School
- Academy of Finland
This study theoretically derived the optimal placement of feed points and evaluated the utility of multiple feed points in large-scale bioreactors. The results showed that optimal multipoint feeds can improve mixing, reduce gradients of pH, substrate, and oxygen, and restore the performance of the bioreactors to ideal conditions. This approach also mitigates the heterogeneity of the biomass population.
The performance of large-scale stirred tank and bubble column bioreactors is often hindered by insufficient macromixing of feeds, leading to heterogeneities in pH, substrate, and oxygen, which complicates process scale-up. Appropriate feed placement or the use of multiple feed points could improve mixing. Here, theoretically optimal placement of feed points was derived using one-dimensional diffusion equations. The utility of optimal multipoint feeds was evaluated with mixing, pH control, and bioreaction simulations using three-dimensional compartment models of four industrially relevant bioreactors with working volumes ranging from 8 to 237 m(3). Dividing the vessel axially in equal-sized compartments and locating a feed point or multiple feed points symmetrically in each compartment reduced the mixing time substantially by more than a minute and mitigated gradients of pH, substrate, and oxygen. Performance of the large-scale bioreactors was consequently restored to ideal, homogeneous reactor performance: oxygen consumption and biomass yield were recovered and the phenotypical heterogeneity of the biomass population was diminished.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据