Abstract Aiming at enhancing the microalgae biomass concentration to produce methane, electrolytic bubble carrying was introduced to Chlorella vulgaris flocculation. With the help of electrolytic microbubbles, instead of settling down, the microalgae flocs rise up. During this flocculation-rising process, the microalgae was concentrated to 63.6 g L−1 which was 5.5-fold of that concentrated in flocculation-settling process. Additionally, the mean floc rising velocity of 29.3 mm s−1 was 22.5-fold of the settling velocity of 1.3 mm s−1. The harvested biomass can be directly used as the substrates of methane fermentation and the fermentation period was shortened by 22.1% with a high C/N (28.0) of cationic starch. Furthermore, the additional cost for these improvements was only 0.09 kWh for per kilogram microalgae (kWh kg−1), and it was less than a quarter of the energy required for mixing. Therefore, based on the high biomass concentration and low additional energy consumption, the combination of electrolytic bubble carrying and cationic starch can be an ideal microalgae-harvesting method for biofuel production.

中文翻译：

---

气泡携带在支链阳离子淀粉絮凝小球藻中的应用：一种高效经济的生物燃料生产收获方法

摘要 为提高微藻生物质浓度产甲烷，将电解载泡引入小球藻絮凝中。在电解微泡的帮助下，微藻絮状物不会沉淀，而是上升。在此絮凝上升过程中，微藻浓缩至 63.6 g L-1，是絮凝沉淀过程中浓缩的 5.5 倍。此外，29.3 mm s-1 的平均絮凝物上升速度是 1.3 mm s-1 沉降速度的 22.5 倍。收获的生物质可直接用作甲烷发酵的底物，阳离子淀粉的高C/N（28.0）使发酵周期缩短22.1%。此外，这些改进的额外成本仅为每公斤微藻 (kWh kg−1) 0.09 kWh，它不到混合所需能量的四分之一。因此，基于高生物质浓度和低附加能耗，电解气泡携带和阳离子淀粉的组合可以成为生物燃料生产的理想微藻收获方法。