Department of Civil and Environmental Engineering, Konkuk University, Neungdong-ro 120, Gwangjin-Gu, Seoul, Republic of Korea.
Chemosphere. 2022 Aug;301:134791. doi: 10.1016/j.chemosphere.2022.134791. Epub 2022 May 1.
In this study, an open pond constructed in Myanmar, a region with tropical climate and favorable environmental conditions for algae growth, was considered to conduct field experiments on sewage inflow river water. The nutrient removal efficiency and productivity of Hydrodictyon reticulatum (H. reticulatum) were analyzed, and the maximum fermentation limit concentration for bioethanol production was determined. Three ponds were operated in batch mode to investigate the effect of light intensity. Photoinhibition was caused due to excessive light intensity in summer season in the region with tropical climate resulting in reduced facility efficiency in the absence of shade. For light blocking, a transparent film was found to be more effective than a translucent film. In the transparent film shading facility, the nitrogen and phosphorus removal efficiencies were maintained above 76% and 81%, respectively, and the productivity of H. reticulatum was 2.27 g m d. For a raceway open pond facility shaded with transparent film, the performance was evaluated based on hydraulic retention time (HRT), and the productivity of algae was found to increase with increasing supply of nitrogen and phosphorous. Maximum biomass production of 3.21 g m d was observed with an HRT of 3 d, suggesting the possibility of long-term operation. As a result of evaluating the ethanol production based on the initial concentration of H. reticulatum, the yield of bioethanol at the initial reducing sugar content of 120 g L was 89.4%, but bioethanol production was only 8.9 g L.
在这项研究中，选择了缅甸的一个露天池塘，该地区气候为热带，藻类生长的环境条件良好，用于进行污水流入河水的野外实验。分析了水网藻（H. reticulatum）的养分去除效率和生产力，并确定了生物乙醇生产的最大发酵极限浓度。以批处理模式运行了三个池塘，以研究光照强度的影响。由于热带地区夏季光照过强，导致光抑制，设施效率降低，因此没有遮阳措施。为了遮光，发现透明膜比半透明膜更有效。在透明膜遮阳设施中，氮和磷的去除效率分别保持在 76%和 81%以上，水网藻的生产力为 2.27 g m d。对于采用透明膜遮阳的养殖槽式露天池塘设施，根据水力停留时间（HRT）评估了其性能，发现藻类的生产力随着氮和磷供应的增加而增加。当 HRT 为 3 天时，观察到最大生物量为 3.21 g m d，表明可以进行长期运行。根据水网藻初始浓度评估乙醇生产结果表明，在初始还原糖含量为 120 g L 的情况下，生物乙醇的产率为 89.4%，但生物乙醇的产量仅为 8.9 g L。
