Advanced Biomass R&D Center, Korea Advanced Institute of Science and Technology (KAIST), 291- Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Lahore, Pakistan.
Environ Sci Pollut Res Int. 2019 Sep;26(26):27396-27406. doi: 10.1007/s11356-019-05904-6. Epub 2019 Jul 20.
This study investigated the growth-dependent role of algal organic matters (AOMs) to achieve high removal efficiency (R.E) of microalgae. The results showed that the microalgae cells produced 96 ± 2% of total AOMs as loose bound AOMSS (LB-AOMs) and 4 ± 1% as cell-bound (CB-AOMs) in exponential phase. In stationary phase, LB-AOMs and CB-AOMs were 46 ± 0.7percentage and 54 ± 0.2 percentage, respectively. The R.Es in exponential and stationary phase were 83 ± 2.6% and 66 ± 1.2%, respectively. It is found that the difference of biomass concentration (between exponential and stationary phase) had no significant impact on the R.E (P > 0.01). Further investigations revealed that LB-AOMs inhibit flocculation in exponential and CB-AOMs in stationary phase; however, CB-AOMs showed stronger inhibition than the LB-AOMs (P < 0.01). The provision of calcium (17 ± 0.9 mg/L) to the culture reduced the AOMs inhibition and improved the R.E from 66 ± 1.2% (in control) to 90 ± 4.2%. An increase in R.E was attributed to the interaction of calcium with AOMs and subsequently acting as a flocculant. The findings of this study can be valuable to improve the performance of auto-flocculation technology, which is mainly limited by the presence of AOMs. Graphical Abstract.
本研究探讨了藻类有机质（AOMs）的生长依赖性作用，以实现微藻的高去除效率（R.E）。结果表明，在指数生长期，微藻细胞产生的总 AOMs 中有 96±2%为松散结合 AOMSS（LB-AOMs），4±1%为细胞结合（CB-AOMs）。在静止期，LB-AOMs 和 CB-AOMs 分别为 46±0.7%和 54±0.2%。指数生长期和静止生长期的 R.E 分别为 83±2.6%和 66±1.2%。结果发现，生物量浓度（指数生长期和静止生长期之间）的差异对 R.E 没有显著影响（P>0.01）。进一步的研究表明，LB-AOMs 在指数生长期抑制絮凝，而 CB-AOMs 在静止期抑制絮凝；然而，CB-AOMs 的抑制作用强于 LB-AOMs（P<0.01）。向培养物中提供钙（17±0.9mg/L）可减少 AOMs 的抑制作用，并将 R.E 从 66±1.2%（对照）提高至 90±4.2%。R.E 的提高归因于钙与 AOMs 的相互作用，随后钙作为絮凝剂发挥作用。本研究的发现对于改进自动絮凝技术的性能可能是有价值的，而自动絮凝技术主要受到 AOMs 的存在的限制。图表摘要。
