Centre for Surface Chemistry and Catalysis, Faculty of Bioscience Engineering, KU Leuven, Kasteelpark Arenberg 23, Box 2461, 3001 Leuven, Belgium.
Centre for Surface Chemistry and Catalysis, Faculty of Bioscience Engineering, KU Leuven, Kasteelpark Arenberg 23, Box 2461, 3001 Leuven, Belgium.
Bioresour Technol. 2014;152:321-8. doi: 10.1016/j.biortech.2013.11.019. Epub 2013 Nov 19.
A membrane photobioreactor (MPBR) is a proven and very useful concept in which microalgae can be simultaneously cultivated and pre-harvested. However, the behavior with respect to accumulation of algogenic organic matter, including transparent exopolymeric particles (TEPs), counter ions and unassimilated nutrients due to the recycling of the medium is still unclear, even though the understanding of this behavior is essential for the optimization of microalgae processing. Therefore, the dynamics of these compounds, especially TEPs, during coupled cultivation and harvesting of Chlorella vulgaris in an MPBR with permeate recycle are addressed in this study. Results show that TEPs are secreted during algae cell growth, and that their presence is thus inevitable. In the system with permeate recycle, substances such as counter ions and unassimilated nutrients get accumulated in the system. This was proven to limit the algae growth, together with the occurrence of bioflocculation due to an increasing broth pH.
膜生物反应器（MPBR）是一种经过验证且非常有用的概念，可同时培养和预先收获微藻。然而，由于介质的再循环，藻源有机物质（包括透明胞外聚合物颗粒（TEP）、抗衡离子和未同化的营养物）的积累行为尚不清楚，尽管了解这种行为对于优化微藻处理至关重要。因此，在本研究中研究了在具有渗透液再循环的 MPBR 中耦合培养和收获普通小球藻时这些化合物（特别是 TEP）的动力学。结果表明，TEP 在藻类细胞生长过程中被分泌，因此其存在是不可避免的。在渗透液再循环的系统中，抗衡离子和未同化的营养物质等物质会在系统中积累。事实证明，这会限制藻类的生长，同时由于培养基 pH 值的升高而发生生物絮凝。
