Microalgal flocculation and sedimentation: spatiotemporal evaluation of the effects of the pH and calcium concentration
Microalgal flocculation and sedimentation: spatiotemporal evaluation of the effects of the pH and calcium concentration
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DOI：
10.1007/s00449-022-02758-0
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发表时间：
2022-08
影响因子：
3.8
通讯作者：
Yuanjun Xia;Masatoshi Kishi;Youta Sugai;T. Toda
中科院分区：
文献类型：
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作者：
Yuanjun Xia;Masatoshi Kishi;Youta Sugai;T. Toda
收获微藻的高成本是微藻工业的主要障碍，并且需要有效的预浓缩方法。本研究通过分析微藻细胞的时空分布，研究了不同pH值（pH 3 ~ 11）和钙离子浓度（0 ~ 5 mM）对小球藻沉降的影响。在pH 9和11的高Ca 2+浓度（5 mM）下发生快速有效的沉降（10分钟内）。然而，沉积物体积在Ca 2+浓度为3 mM时低于在Ca 2+浓度为5 mM时。这表明Ca 2+浓度强烈影响泥沙量。在pH 7和Ca 2+浓度为5 mM时发现快速沉降和低沉降体积，这可能是因为系统中的中性电荷（在高pH下会发生与钙沉淀物的粘附）。最高的Ca 2+回收率（82%）时，在pH 11和5 mM的Ca 2+浓度的沉淀物被酸化到pH 3。
The high cost of harvesting microalgae is a major hurdle for the microalgae industry, and an efficient pre-concentration method is required. In this study, the effects of using different pH values (between pH 3 and 11) and calcium (Ca2+) concentrations (between 0 and 5 mM) onChlorella vulgarissedimentation were investigated by evaluating the spacio-temporal distributions of microalgae cells. Fast and efficient sedimentation occurred (within 10 min) at a high Ca2+concentration (5 mM) at pH 9 and 11. However, the sediment volume was lower at a Ca2+concentration of 3 mM than at a Ca2+concentration of 5 mM. This indicated that the Ca2+concentration strongly affected the sediment volume. Fast sedimentation and a low sediment volume were found at pH 7 and a Ca2+concentration of 5 mM, probably because of the neutral charge in the system (adhesion to calcium precipitates would have occurred at a high pH). The highest Ca2+recovery (82%) was achieved when sediment produced at pH 11 and a Ca2+concentration of 5 mM was acidified to pH 3.