| 紫外线对再生水中斜生栅藻的生长抑制效果 |
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| 引用本文： | 李尚,陶益,刀国华,江海莎,周季,余雯雯,薛媛媚,雍晓蕾,何志明,谢怀建,付志敏,胡洪营.紫外线对再生水中斜生栅藻的生长抑制效果[J].环境工程,2020,38(10):97. |
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| 作者姓名： | 李尚 陶益 刀国华 江海莎 周季 余雯雯 薛媛媚 雍晓蕾 何志明 谢怀建 付志敏 胡洪营 |
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| 作者单位： | 1. 清华大学 清华-伯克利深圳学院, 深圳 518055; |
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| 基金项目： | 清华大学(环境学院)-成都市兴蓉环境股份有限公司水务先进技术联合研究中心研发课题;北京市科技计划;水体污染控制与治理科技重大专项;国家重点研发计划 |
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| 摘 要： | 再生水具有就近易得、水量大且稳定等突出优点，已成为景观水体的重要补给水源。但再生水中含有氮、磷等营养物质，景观回用过程中可能会加剧藻类水华爆发风险。在藻类生长的早期阶段，采用紫外线处理有可能将再生水中藻类生物量控制在低风险范围，从而预防再生水景观回用水体中发生水华。以深圳市某污水处理厂二级出水为再生水回用景观水体的典型样品，考察了紫外线（254 nm波段）对典型微藻斜生栅藻的生长抑制效果，采用流式细胞术、调制荧光技术等方法，研究了不同紫外剂量对斜生栅藻的生长抑制效果，以及对藻细胞膜完整性和光合活性的影响。结果表明:对于初始密度约为7×104个/mL的斜生栅藻，50~100 mJ/cm2的紫外线能够取得1~5 d的生长抑制期，150~200 mJ/cm2剂量能将生长抑制期延长至10 d。紫外线能迅速引起斜生栅藻光合活性下降并能逐渐引起部分藻细胞破裂，100~200 mJ/cm2剂量处理后10 d内膜损伤细胞比例达到16%~71%。可见，紫外线能够对再生水中的斜生栅藻取得显著的生长抑制效果，是具有应用前景的景观水体水华风险防控手段。
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| 关 键 词： | 斜生栅藻 再生水 紫外线 生长抑制 细胞膜完整性 光合活性 |
| 收稿时间： | 2019-12-02 |
GROWTH SUPPRESSION EFFECT OF UV-C IRRADIATION ON SCENEDESMUS OBLIQUUS IN RECLAIMED WATER |
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| LI Shang,TAO Yi,DAO Guo-Hua,JIANG Hai-Sha,Zhou-ji,YU Wen-Wen,XUE Yuan-Mei,YONG Xiao-Lei,HE Zhi-Ming,XIE Huai-Jian,FU Zhi-Min,HU Hong-ying.GROWTH SUPPRESSION EFFECT OF UV-C IRRADIATION ON SCENEDESMUS OBLIQUUS IN RECLAIMED WATER[J].Environmental Engineering,2020,38(10):97. |
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| Authors: | LI Shang TAO Yi DAO Guo-Hua JIANG Hai-Sha Zhou-ji YU Wen-Wen XUE Yuan-Mei YONG Xiao-Lei HE Zhi-Ming XIE Huai-Jian FU Zhi-Min HU Hong-ying |
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| Affiliation: | 1. Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen 518055, China;2. Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China;3. School of Environment, Tsinghua University, Beijing 100084, China;4. Chengdu Xingrong Environmental Co., Ltd, Chengdu 610041, China;5. Foshan Comwin Light & Electricity Co., Ltd, Foshan 528518, China |
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| Abstract: | Reclaimed water has the outstanding advantages of easy to obtain, large quantity, stable and high resource availability, and is gradually becoming an important source for landscape water. However, reclaimed water contains nutrients such as nitrogen and phosphorus, therefore exacerbates the risk of algal blooms during landscape reuse. UV-C irradiation can suppress algal growth for several days in the early growth stage, thereby is proposed as an approach for preventing algal blooms. In this study, the secondary effluent from a sewage treatment plant in Shenzhen was taken as a typical sample of reclaimed water for landscape, and the growth suppression effect of UV-C (254 nm) on a typical Chlorophyta species, Scenedesmus obliquus were investigated. The effect of UV-C doses on growth characteristics, cell membrane integrity and photosynthetic activity of S. obliquus were assessed by a flow cytometry and a PHYTO-PAM chlorophyll fluorometer. The results showed that for S. obliquus, with an initial density of about 7×104 cells/mL, UV-C irradiation at 50~100 mJ/cm2 achieved a growth inhibition period of 1~5 d, and the growth inhibition period could be further extended to 10 days at UV-C doses of 150~200 mJ/cm2. UV-C irradiation caused marked decreases in photosynthetic activity of S. obliquus immediately and caused rupture of part of the cells gradually, and the percentage of membrane damaged cells increased to 16%~71% within 10 days after 100~200 mJ/cm2 UV-C treatment. In summary, UV-C could achieve significant suppression effect on S. obliquus growth, which was a promising method for preventing and controlling the bloom risk of S. obliquus in reclaimed water. |
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