Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.
Bioresour Technol. 2020 May;304:123012. doi: 10.1016/j.biortech.2020.123012. Epub 2020 Feb 13.
To explore the energy barrier between microalgae cells that impedes their aggregation and their interfacial interactions with cationic starch (CS), this study applied the extended Derjaguin Landau Verwey Overbeek (eDLVO) theory combined with the flocculation performance to analyze the interactions. The result shows that zeta potential based electrostatic interaction played a determinative role no matter for the energy barrier or the interfacial interactions. The energy barrier between microalgae cells would decrease with the descend of the pH and it disappeared when the pH decreased to 3 and resulted in self-flocculation. The quantitative analysis of the interfacial interactions between microalgae cell and CS showed well agreement with the experiment data of flocculation efficiency (FE) under different conditions of pH and ionic strength. Thus, the quantitative findings will be helpful to know the aggregation and flocculation process better and find more effective flocculants for microalgae harvesting.
为了探索阻碍微藻细胞聚集的能垒及其与阳离子淀粉（CS）的界面相互作用，本研究应用扩展的德热那广义维韦尔（eDLVO）理论结合絮体性能来分析相互作用。结果表明，无论对能垒还是界面相互作用，基于zeta 电位的静电相互作用都起着决定性的作用。微藻细胞之间的能垒随着 pH 值的降低而降低，当 pH 值降低到 3 时能垒消失，导致自絮凝。微藻细胞与 CS 之间界面相互作用的定量分析与不同 pH 值和离子强度条件下的絮体效率（FE）实验数据吻合较好。因此，定量结果将有助于更好地了解聚集和絮凝过程，并找到更有效的微藻收获絮凝剂。
