The water intake facility of Paldangho Lake (PIF), constructed in 1988, supplies drinking water to the Seoul metropolitan area and satellite city (ca. 20 million inhabitants) in South Korea. A nuisance cyanobacterial bloom (CB) has been observed every year in the PIF. Thus, related governments have been funding the control of CBs and algal-originated materials (AOMs). In this study, an algae-blocking mat (ABM) was developed to protect against CBs and AOMs considering temperature and water depth. We evaluated the daily and monthly performance of the ABM on phytoplankton, pH, dissolved oxygen, chlorophyll-a, and light intensity between April and October 2015. Although the average cell abundance of cyanobacteria between July and September approached the warning level of the Korea alert system, the highest algal removal efficiency was recorded as 92% in August when the cyanobacterial cells were over 66,000 cells/mL. On average, the ABM showed a low removal efficiency of 26% on both geosmin and 2-methylisoborneol, whereas total phytoplankton was more than 30%. In conclusion, our results indicate that the ABM may be an economical blocking tool for nuisance cyanobacteria in drinking water resources, considering AOMs and total phytoplankton.

中文翻译：

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使用替代藻类阻滞垫控制饮用水中的有害蓝藻

八堂湖取水设施 (PIF) 建于 1988 年，为韩国首尔市区和卫星城（约 2000 万居民）提供饮用水。每年都在 PIF 中观察到令人讨厌的蓝藻水华 (CB)。因此，相关政府一直在资助控制 CB 和藻源材料 (AOM)。在这项研究中，考虑到温度和水深，开发了一种藻类阻挡垫 (ABM) 来防止 CB 和 AOM。我们评估了 ABM 在 2015 年 4 月至 10 月期间对浮游植物、pH、溶解氧、叶绿素-a 和光照强度的每日和每月表现。尽管 7 月至 9 月期间蓝藻的平均细胞丰度接近韩国警报的警戒水平系统，8 月份蓝藻细胞数超过 66,000 个/mL 时，藻类去除率最高，达到 92%。平均而言，ABM 对土臭素和 2-甲基异冰片的去除效率低，仅为 26%，而总浮游植物超过 30%。总之，我们的结果表明，考虑到 AOM 和总浮游植物，ABM 可能是一种经济的阻断饮用水资源中有害蓝藻的工具。