Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, People's Republic of China; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, People's Republic of China; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
Sci Total Environ. 2017 Dec 31;609:1322-1328. doi: 10.1016/j.scitotenv.2017.07.187. Epub 2017 Aug 7.
Ulva prolifera (U. prolifera) has been frequently involved in terrible algal proliferation in coastal areas. Although it is known to be associated with green tide, its contribution to the natural attenuation of the polycyclic aromatic hydrocarbons (PAHs) in seawater has not been evaluated. In this study, the removal of phenanthrene using U. prolifera collected from coastal water with green tide blooming was investigated. The results showed that phenanthrene could be removed efficiently in the presence of both the live and heat-killed U. prolifera. The phenanthrene concentrations of the live algae treatment decreased smoothly from 10.00 to 0.80μgL through the whole process, while those of the heat-killed algae treatment decreased sharply from 10.0 to 2.71μgL in one day and kept constantly after that. The in situ monitoring and visualizing using laser confocal scanning microscopy (LCSM) confirmed the accumulation of phenanthrene in U. prolifera. The increase in nutrient and temperature led to the increase of phenanthrene removal rate, while the salinity had less influence on the removal of phenanthrene. The removal efficiency by U. prolifera had a good linear relationship with phenanthrene initial concentration (r=0.999) even at 100μgL which was higher than its environmentally relevant concentrations. High removal efficiency (91.3%) was observed when the initial phenanthrene concentration was set at environmental relevant concentration (5μgL). Results of this study demonstrate a potential new natural attenuation process for typical PAHs in coastal water during the outbreak of green tide. These findings indicate that the outbreak of harmful green tide algae may bring positive environmental benefits in the terms of the removal of harmful organic pollutants from coastal waters.
聚生石莼（U. prolifera）经常参与沿海地区的严重藻类增殖。虽然已知其与绿潮有关，但尚未评估其对海水中多环芳烃（PAHs）的自然衰减的贡献。在这项研究中，研究了从绿潮爆发的沿海水中采集的聚生石莼对菲的去除。结果表明，活体和热灭活的聚生石莼都可以有效地去除菲。活体藻类处理的菲浓度在整个过程中从 10.00 降至 0.80μgL，而热灭活藻类处理的菲浓度在一天内从 10.0 急剧降至 2.71μgL，此后保持恒定。使用激光共聚焦扫描显微镜（LCSM）进行的原位监测和可视化证实了菲在聚生石莼中的积累。营养物质和温度的增加导致菲去除率的增加，而盐度对菲的去除影响较小。聚生石莼的去除效率与菲的初始浓度呈良好的线性关系（r=0.999），即使在 100μgL 时也高于其环境相关浓度。当初始菲浓度设定为环境相关浓度（5μgL）时，观察到 91.3%的高去除效率。本研究的结果证明了在绿潮爆发期间，沿海水中典型 PAHs 的一种新的自然衰减过程。这些发现表明，有害绿潮藻类的爆发可能会在从沿海水中去除有害有机污染物方面带来积极的环境效益。
