Department of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha, Qatar.
Department of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha, Qatar.
Bioresour Technol. 2019 Jun;281:250-259. doi: 10.1016/j.biortech.2019.02.103. Epub 2019 Feb 23.
Quick algae harvesting methodologies relating optimum flocculent dose (D), percentage harvesting efficiency (%HE) and percentage water recovery (%W) to the in-situ hydrodynamic properties of water-algae systems are presented. Flocculation of three microalgae in single and sequential steps, using chemical (polymer and ferric chloride) and biological (egg shells) flocculants, was studied. Zeta potential and pH analysis were completed to further understand the flocculation mechanism. Polymer at D of 7.0 g/kgDS resulted in W of 90% and %HE of 96.7%. Lower %HE (92.1), %W (79) and noticeable algal cells deformation was observed for ferric chloride at D of 7.0 g/kg DS. Bio-flocculant conserved algal structure and resulted in %HE of 96.2 and %W of 90 at D of 5.4 g/kgDS. Significant % HE of 99.8, %W of 99.8%, and up to 95% reduction in D were achieved in sequential flocculation. The results established the effectiveness and suitability of sequential/ bio-flocculation for algae harvesting.
介绍了快速藻类收获方法，这些方法将最佳絮凝剂剂量 (D)、收获效率 (%HE) 和水回收率 (%W) 与水-藻类系统的原位水动力特性相关联。研究了三种微藻在单一和连续步骤中的絮凝作用，使用了化学（聚合物和氯化铁）和生物（蛋壳）絮凝剂。完成了动电位和 pH 值分析，以进一步了解絮凝机制。聚合物在 D 为 7.0 g/kgDS 时，W 为 90%，%HE 为 96.7%。在 D 为 7.0 g/kg DS 时，氯化铁的 %HE（92.1）、%W（79）和明显的藻类细胞变形较低。生物絮凝剂保持藻类结构，在 D 为 5.4 g/kg DS 时，%HE 为 96.2，%W 为 90。在连续絮凝中，可实现高达 99.8%的 %HE、99.8%的 %W 和高达 95%的 D 减少。结果表明，顺序/生物絮凝法在藻类收获方面是有效和合适的。
