Huy Menghour, Kumar Gopalakrishnan, Sharma Pooja, Sirohi Ranjna, Pandey Ashok, Kim Sang-Hyoun
Department of Chemistry, Bioscience, and Environmental Engineering, Faculty of Science and Technology, Forus, 8400 Stavanger, Norway.
Department of Chemistry, Bioscience, and Environmental Engineering, Faculty of Science and Technology, Forus, 8400 Stavanger, Norway.
J Biotechnol. 2022 Nov 10;358:25-32. doi: 10.1016/j.jbiotec.2022.08.010. Epub 2022 Aug 13.
Microalgae biomass has been considered as one of the potential feedstocks in biofuel production. Yet, biomass harvesting poses a challenge to the overall production cost due to its low cell density. Flocculation has been marked as one of the promising processes in microalgae harvesting technology. In this study, the first screening of two anionic (A-230, and A-330E) and five cationic polymers (C-810E, C-810EL, C-810EB, C-810ELH, and C-810EMB) followed by gravity settling with the mixed microalgae concentration of 2.24 g/L revealed that anionic polymers are less effective. Whereas all cationic polymers achieved above 90% harvesting efficiency. Therefore, the maximum mass recovery of 98.7% with 86.8 g/L sediment content was achieved by adjusting pH to 6-0.6 mL/L (115.178 mg/g) of C-810E followed by 15-min settling. The cationic polymer addition followed by settling would enable cost-effective downstream processing of microalgal biomass.
微藻生物质被认为是生物燃料生产中潜在的原料之一。然而，由于其细胞密度低，生物质收获对总体生产成本构成了挑战。絮凝已被视为微藻收获技术中一种有前景的方法。在本研究中，首先对两种阴离子聚合物（A - 230和A - 330E）和五种阳离子聚合物（C - 810E、C - 810EL、C - 810EB、C - 810ELH和C - 810EMB）进行筛选，然后在混合微藻浓度为2.24 g/L的情况下进行重力沉降，结果表明阴离子聚合物效果较差。而所有阳离子聚合物的收获效率均达到90%以上。因此，通过将pH值调至6，添加0.6 mL/L（115.178 mg/g）的C - 810E，然后沉降15分钟，实现了98.7%的最大质量回收率，沉积物含量为86.8 g/L。添加阳离子聚合物后进行沉降将使微藻生物质的下游加工具有成本效益。
