紫外线对原水中几种微藻的作用效果研究

Impact of UV on several species of microalgae in raw water

采用准平行光束仪对梅尼小环藻、谷皮菱形藻、钝脆杆藻、小球衣藻、镰形纤维藻、斜生栅藻、铜绿微囊藻和卵形隐藻等8种微藻进行辐射,确定剂量反应关系,研究紫外线对它们的作用效果及特点。结果表明,紫外线对梅尼小环藻、谷皮菱形藻、镰形纤维藻、斜生栅藻、铜绿微囊藻和卵形隐藻均具有一定的灭活作用,灭活率随着紫外线剂量的增加而提高,在剂量为400mJ/cm2时它们的灭活率分别为15.5%、26.9%、50.4%、6.9%、64.3%和19.8%;低剂量的紫外线对钝脆杆藻和小球衣藻细胞生长有促进作用,在剂量大于300mJ/cm2时有灭活作用,在剂量为400mJ/cm2时的灭活率分别为15.7%和6.2%。藻细胞个体大小不是影响紫外线灭活效果的原因,藻的种类、藻细胞壁的有无及其成分的不同等可能是造成不同灭活效果的原因。

The collimated light beam was employed to irradiate eight species of microalgae： Cyclotella meneghiniana Kutz, Nitzschia palea. , Fragilaria capucina, Chlamydomonas microsphaera, Ankistrodesmus f alcatus, Scenedesmus obliquus, Microcystis sp. and Cryptomonas ovata Her. The results showed that UV had some inactivation effects on Cyclotella meneghiniana Kutz , Nitzschia palea. , Ankistrodesmus f alcatus , Scenedesmus obliquus , Microcystis sp. and Cryptomonas ovata Her, the inactivation rate increased with the increasing of UV dosage, and when the dosage was 400 mJ/cm^2, the inactivation rate were 15. 5%,26.9%,50. 4%,6. 9%,64. 3% and 19. 8% respectively; low dosage UV could improve the growth of Fragilaria capucina and Chlamydomonas microsphaera, when the dosage was above 300 mJ/cm^2, it had some inactivation effects, while when the dosage reached 400 mJ/cm^2, the inactivation rate were 15. 7% and 6. 2% respectively. The algal cell size wasn＇t the factor influencing the UV inactivation effect, while the algae species, the existence and inexistence of the algae cell wall, and the different components of algae wall might be the main reasons for the inactivation effect.