Department of Biology and Environment, Faculty of Natural Sciences, University of Haifa-Oranim, Tivon 3600600, Israel.
The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel.
Bioresour Technol. 2017 Mar;228:141-146. doi: 10.1016/j.biortech.2016.12.040. Epub 2016 Dec 21.
Microalgae harvesting is a major hurdle in the use of microalgae for oil production. Here we describe the use of a standard cationic polymer used for water treatment, Polydiallyldimethylammonium chloride (PDADMAC), for sedimentation of Chlorella vulgaris and comparison of its flocculation properties with two other polymers, chitosan and Superfloc®. We found PDADMAC to be the most effective flocculant with 90% of the algae flocculating at concentrations as low as 5mg/L within 60min, and good activity even at pH=10. Interestingly, with both PDADMAC and chitosan maximum flocculation was achieved much before zeroing of zeta potential. PDADMAC flocculation was also very effective in enhancing harvest by filtration and somewhat at flocculation and sedimentation of marine algae, Nannochloropsis salina.
微藻收获是利用微藻生产油脂的主要障碍。在这里，我们描述了一种标准的阳离子聚合物聚二甲基二烯丙基氯化铵（PDADMAC）在小球藻沉淀中的应用，并将其絮凝性能与另外两种聚合物壳聚糖和 Superfloc®进行了比较。我们发现 PDADMAC 是最有效的絮凝剂，在 60min 内，浓度低至 5mg/L 时就有 90%的藻类絮凝，即使在 pH=10 时也具有良好的活性。有趣的是，对于 PDADMAC 和壳聚糖，最大絮凝作用都在零 zeta 电位之前实现。PDADMAC 絮凝在增强过滤收获方面也非常有效，在絮凝和沉降海洋藻类盐生杜氏藻方面也有一定效果。
