Abstract：
In this study, the growth characteristics of microalgae cultured with different carbon sources were analyzed, and the flocculation characteristics under the influence of carbon sources were evaluated using three typical flocculants. The results showed that the organic carbon sources could significantly increase the content of extracellular proteins in microalgae. Specifically, the extracellular protein concentrations of microalgae cultured with pure BG-11, ethanol, sodium acetate and glucose were 18.2 29.2, 97.3, and 34.7 mg/g, respectively. During the flocculation process, microalgae cultured with sodium acetate exhibited a weak response to the flocculant because of excessive extracellular proteins inhibited flocculation. In addition, the flocculation efficiency was also less than 50.0% cultured with sodium acetate in all pH test ranges when alum and chitosan were used as flocculants. It could be inferred that the flocculant initially happened to charge neutralization with the negatively charged proteins in the solution and then bridged the charges with the microalgae. These findings provide insights into the effects of different carbon sources on microalgal flocculation, promising organic integration of microalgae wastewater treatment and harvesting.
摘要：
在这项研究中,分析了不同碳源培养的微藻的生长特性,并利用三种典型絮凝剂对碳源影响下的絮凝特性进行了评价。结果表明，有机碳源能显著提高微藻胞外蛋白的含量。具体来说,用纯BG-11、乙醇、乙酸钠和葡萄糖分别为18.229.2、97.3和34.7mg/g，分别。在絮凝过程中,用乙酸钠培养的微藻对絮凝剂的反应较弱，因为过量的细胞外蛋白抑制了絮凝。此外,当使用明矾和壳聚糖作为絮凝剂时，在所有pH测试范围内，用乙酸钠培养的絮凝效率也小于50.0％。可以推断,絮凝剂最初与溶液中带负电荷的蛋白质发生电荷中和,然后与微藻桥接电荷。这些发现为不同碳源对微藻絮凝的影响提供了见解，有前途的微藻废水处理和收获的有机整合。
