Wang Ruigang, Wang Tiecheng, Qu Guangzhou, Zhang Ying, Guo Xuetao, Jia Hanzhong, Zhu Lingyan
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, PR China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, PR China.
Water Res. 2021 May 15;196:117027. doi: 10.1016/j.watres.2021.117027. Epub 2021 Mar 9.
Cyanobacteria blooms threaten water supply and are potential sources for disinfection byproducts (DBPs) formation. In this study, the underlying mechanisms for effective removal of A. spiroides and the following depression on the formation of DBPs were disclosed. Highly efficient inactivation (more than 99.99%) of A. spiroides was realized by the plasma treatment within 12 min, and 93.4% of Anatoxin-a was also removed within 12 min, with no signals of resurrection after 7 days' re-cultivation. Transcriptomic analysis demonstrated that the expressions of the genes related to cell walls and peripherals, thylakoid membranes, photosynthetic membranes, and detoxification of toxins were distinctly altered. The generated reactive oxidative species (ROS), including ·OH, O, and O, attacked A. spiroides and resulted in membrane damage and algae organic matter (AOM) release. EEM-PARAFAC analysis illustrated that the AOM compositions were subsequently decomposed by the ROS. As a result, the formation potentials of the C-DBPs and N-DBPs were significantly inhibited, due to the effectively removal of AOM and Anatoxin-a. This study disclosed the underneath mechanisms for the effective inactivation of A. spiroides and inhibition of the following formation of the DBPs, and supplied a prospective technique for integrated pollutant control of cyanobacterial containing drinking water.
蓝藻水华威胁着供水安全，并且是消毒副产物（DBPs）形成的潜在来源。在本研究中，揭示了有效去除螺旋鱼腥藻以及随后抑制DBPs形成的潜在机制。通过等离子体处理在12分钟内实现了对螺旋鱼腥藻的高效灭活（超过99.99%），并且在12分钟内还去除了93.4%的类毒素-a，在重新培养7天后没有复活迹象。转录组分析表明，与细胞壁及外周、类囊体膜、光合膜和毒素解毒相关的基因表达发生了明显变化。所产生的活性氧化物质（ROS），包括·OH、O和O，攻击螺旋鱼腥藻并导致膜损伤和藻类有机物（AOM）释放。EEM-PARAFAC分析表明，AOM成分随后被ROS分解。结果，由于AOM和类毒素-a的有效去除，碳基DBPs和氮基DBPs的形成潜力受到显著抑制。本研究揭示了有效灭活螺旋鱼腥藻以及抑制随后DBPs形成的潜在机制，并为含蓝藻饮用水的综合污染物控制提供了一种前瞻性技术。
