College of Civil Engineering, Fuzhou University, 350116, Fujian, China; Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, Fuzhou University, 350002, Fujian, China.
College of Civil Engineering, Fuzhou University, 350116, Fujian, China.
J Environ Manage. 2021 Mar 1;281:111884. doi: 10.1016/j.jenvman.2020.111884. Epub 2020 Dec 29.
A new method for algal community restructuring is proposed, where harmful algae growth is inhibited through the addition of remedial nano-agent, while probiotic algae growth is promoted or only affected indistinctively. In this paper, the inhibiting effects of five different nanomaterials on Microcystis aeruginosa (M. aeruginosa) and Cyclotella sp. were studied, and the optimal nanomaterial was served as algae-inhibition ingredient of the remedial agent. The effects of the remedial agent on algal growth and their physiological characteristics were investigated, and the restructuring of algal community in actual water samples was explored. The results indicated that the inhibition ratio of 10 mg/L nm-CuO/SiO on M. aeruginosa and Cyclotella sp. could reach 293.1% and 82.8% respectively, acting as the best candidate for algae-inhibiting ingredient. After adding the remedial nano-agent made with nm-CuO/SiO, the content of chlorophyll a, protein, and polysaccharides of M. aeruginosa decreased sharply, while the physiological characteristics of Cyclotella sp. were not significantly affected. Besides, the total biomass and proportion of cyanobacteria dropped (P < 0.05), but the Bacillariophyta biomass increased significantly (P < 0.05). The uniformity index, Shannon-Wiener index, and richness index all increased significantly (P < 0.05). Meanwhile, the quality of actual water samples has been improved evidently (P < 0.001). Therefore, the prepared remedial nano-agent in this study can control the harmful algae bloom to a certain extent by restructuring the algal community in eutrophic water bodies.
提出了一种藻类群落重构的新方法，通过添加修复纳米剂来抑制有害藻类的生长，同时促进或基本不影响有益藻类的生长。本文研究了五种不同纳米材料对铜绿微囊藻（M. aeruginosa）和聚轮藻（Cyclotella sp.）的抑制作用，选择最优的纳米材料作为修复剂的抑藻成分。研究了修复剂对藻类生长及其生理特性的影响，探索了实际水样中藻类群落的重构。结果表明，10 mg/L nm-CuO/SiO 对铜绿微囊藻和聚轮藻的抑制率分别可达 293.1%和 82.8%，是最佳的抑藻成分候选材料。添加 nm-CuO/SiO 制成的修复纳米剂后，铜绿微囊藻的叶绿素 a、蛋白质和多糖含量急剧下降，而聚轮藻的生理特性没有明显影响。此外，蓝藻的总生物量和比例下降（P < 0.05），但硅藻的生物量显著增加（P < 0.05）。均匀度指数、香农-威纳指数和丰富度指数均显著增加（P < 0.05）。同时，实际水样的水质明显改善（P < 0.001）。因此，本研究制备的修复纳米剂可以通过重构富营养化水体中的藻类群落，在一定程度上控制有害藻类的爆发。
