Department of Civil and Environmental Engineering, Konkuk University, Neungdong-ro 120, Gwangjin-Gu, Seoul, Republic of Korea.
Chemosphere. 2021 Aug;277:130129. doi: 10.1016/j.chemosphere.2021.130129. Epub 2021 Mar 16.
Although microalgae are seen as a potential alternative source of energy and other materials currently sourced from petroleum, issues still remain with industrialization because of difficulties in developing commercially operational microalgal production systems. We set up a pilot-scale study that involved the simultaneous reuse of wastewater and production of algae under different light and harvesting conditions. We cultivated Hydrodictyon reticulatum (H. reticulatum), a type of water-net algae, using secondary effluent from a wastewater treatment plant in a raceway open pond combined with an underwater light device. Experimental results showed that the underwater light device maintained some level of underwater light throughout the year. Photoinhibition of algal growth only occurred when the sunlight exceeded 1270 μmol m s. During the non-harvest process, the maximum algal concentration was 1700 mg L at 20 days after the experiment began, the maximum specific growth rate was 0.18 d and the maximum productivity was 21.3 g m d. Conversely, periodic harvesting decreased the concentration of nutrients in the effluent more as the days of cultivation increased, but the productivity of algae also decreased to 11.7 g m d. The maximum yield of bioethanol using three kinds of fermentation strains was 93.5% and, thus, the commercial value of H. reticulatum as a raw material for energy production was excellent.
尽管微藻被视为替代石油能源和其他材料的潜在来源，但由于开发商业可行的微藻生产系统存在困难，工业化仍存在问题。我们进行了一项试点研究，涉及在不同光照和收获条件下同时重复利用废水和藻类生产。我们使用来自污水处理厂的二级出水在跑道式开放池塘中结合水下照明设备来培养水网藻（Hydrodictyon reticulatum，H. reticulatum）。实验结果表明，水下照明设备全年都能保持一定程度的水下光照。只有当阳光超过 1270 μmol m s 时，藻类生长才会受到光抑制。在非收获过程中，实验开始后第 20 天，藻类的最大浓度达到 1700 mg L，最大比增长率为 0.18 d，最大生产力为 21.3 g m d。相反，随着培养天数的增加，周期性收获会使废水中的营养物质浓度下降更多，但藻类的生产力也下降到 11.7 g m d。使用三种发酵菌株的生物乙醇最大产量为 93.5%，因此，水网藻作为能源生产原料具有很高的商业价值。
