线-筒式介质阻挡放电等离子体失活水华鱼腥藻和同步降解鱼腥藻毒素的效果

为研究线-筒式介质阻挡放电等离子体失活水华鱼腥藻（Anabaena flosaguas）及同步降解鱼腥藻毒素（anatoxin-a）的效果和相关机制，选取水华鱼腥藻及鱼腥藻毒素为研究对象，以处理后藻悬液中的藻细胞浓度、藻毒素浓度及活性基团浓度为考察指标，进行不同等离子体输入功率及空气流量下的单因子实验。结果表明，等离子体输入功率为50 W，空气流量为100 L·h^-1时，10 min处理即可失活藻悬液中超过5 log10·mL^-1浓度的水华鱼腥藻，与此同时藻悬液中鱼腥藻毒素的浓度同步降低了99 %以上。介质阻挡放电等离子体对水华鱼腥藻的失活及对鱼腥藻毒素的降解效果在一定范围内随着输入功率和空气流量的增加而大幅提高。此外，等离子体处理后藻悬液中活性基团（H₂O₂和O₃）的浓度显著提升，可能在藻细胞失活和藻毒素同步降解的过程中起重要作用。

Inactivation and synchronous degradation effects on Anabaena flosaguas and anatoxin-a by line-cylinder type dielectric barrier discharge plasma

In order to study the effects and related mechanisms on the inactivation of Anabaena flosaguas and the synchronous degradation of anatoxin-a by a line-barrel dielectric barrier discharge (DBD) plasma, Anabaena flosaguas and anatoxin-a are selected as experimental objects in this study. The concentrations of cyanobacterial cell, algal toxin and reactive species in the plasma-treated algal suspensions are set as the investigation indexes. Afterwards, the single-factor experiments are carried out on variant plasma input power and air flow rate. Experimental results showed that a 10 min of DBD plasma treatment with input power at 50 W and air flow rate at 100 L·h^-1 effectively inactivated more than 5 log10·mL^-1 concentration of Anabaena flosaguas in the algal suspension, meanwhile the concentration of anatoxin-a simultaneously decreased by more than 99 %. Notably, the increasing plasma input power and air flow rate are largely favorable for the cyanobacterial inactivation and algal toxin removal in a reasonable range. Moreover, the concentrations of reactive species (H₂O₂ and O₃) in the plasma-treated algal suspensions significantly increased with enhancing discharge time, which might have played crucial roles in the cyanobacterial cell inactivation and the synchronous algal toxin removal.