Flocculation of microalgae using cationic starch
Flocculation of microalgae using cationic starch
复制标题
DOI：
10.1007/s10811-009-9488-8
复制
发表时间：
2010-08-01
影响因子：
3.3
通讯作者：
Muylaert, Koenraad
中科院分区：
文献类型：
--
作者：
Vandamme, Dries;Foubert, Imogen;Muylaert, Koenraad
由于它们的体积小，在培养基中的浓度低，具有成本效益的收获微藻是一个重大挑战。我们评估了潜在的阳离子淀粉作为絮凝剂收获微藻使用瓶测试实验。阳离子淀粉对淡水微藻（副小球藻、栅藻）有较好的絮凝效果，但对海洋微藻（褐指藻、微拟球藻）无明显絮凝效果。在高阳离子淀粉剂量下，观察到分散体再稳定。诱导絮凝所需的阳离子淀粉剂量随初始藻类生物质浓度线性增加。在所测试的两种商业阳离子淀粉絮凝剂中，Greenfloc 120（用于废水处理）比Cargill C*Bond HR 35.849（用于造纸）更有效。对于使用Greenfloc 120絮凝副小球藻，絮凝80%的藻类生物质所需的阳离子淀粉与藻类生物质的比率为0.1。对于栅藻，需要较低的剂量（比值0.03）。在pH 5 ~ 10范围内，Greenfloc 120对副小球藻的絮凝作用与pH无关。PSII的最大量子产率的测量表明，Greenfloc 120阳离子淀粉是没有毒性的副小球藻。阳离子淀粉可用作高效、无毒、成本有效且广泛可得的絮凝剂用于收获微藻生物质。
Due to their small size and low concentration in the culture medium, cost-efficient harvesting of microalgae is a major challenge. We evaluated the potential of cationic starch as a flocculant for harvesting microalgae using jar test experiments. Cationic starch was an efficient flocculant for freshwater (Parachlorella, Scenedesmus) but not for marine microalgae (Phaeodactylum, Nannochloropsis). At high cationic starch doses, dispersion restabilization was observed. The required cationic starch dose to induce flocculation increased linearly with the initial algal biomass concentration. Of the two commercial cationic starch flocculants tested, Greenfloc 120 (used in wastewater treatment) was more efficient than Cargill C*Bond HR 35.849 (used in paper manufacturing). For flocculation of Parachlorella using Greenfloc 120, the cationic starch to algal biomass ratio required to flocculate 80% of algal biomass was 0.1. For Scenedesmus, a lower dose was required (ratio 0.03). Flocculation of Parachlorella using Greenfloc 120 was independent of pH in the pH range of 5 to 10. Measurements of the maximum quantum yield of PSII suggest that Greenfloc 120 cationic starch was not toxic to Parachlorella. Cationic starch may be used as an efficient, nontoxic, cost-effective, and widely available flocculant for harvesting microalgal biomass.