Inactivation Effects of UV-C Irradiation on Apatococcuslobatus Growing on the Surface of the Post Insulators with RTV Coat

被引：0
|
作者：
Lou K. [1 ]
Tao Y. [1 ]
Liu X. [1 ]
Wang X. [2 ]
Jia Z. [2 ]
机构：
[1] Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen
[2] Laboratory of Advanced Technology of Electrical Engineering & Energy, Graduate School at Shenzhen, Tsinghua University, Shenzhen
来源：
Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 02期
关键词：
Apatococcuslobatus; Inactivation effects; Photosynthetic activity; Post insulators; UV-C irradiation;
D O I：
10.13336/j.1003-6520.hve.20190130028
中图分类号：
学科分类号：
摘要：
The Chlorococcum are often observed to grow abundantly on the surface of the post insulators with RTV coat in several transformer substations in Southwest China and South China, resulting in algae pollution and abnormal insulation performance. Taking the Apatococcuslobatus that grows on the surface of the post insulators with RTV as the target microalgae species, we investigated the effects of UV-C irradiation on the growth inactivation, cell lysis, photosynthetic activity and pigments contents of microalgal cells. The results show that the UV-C dose at 250 mJ/cm2 and above can suppress the growth of Apatococcuslobatus with initial cell density of 1.2×107 cells/mL for seven days. Moreover, the UV-C dose at 500~2 000 mJ/cm2 can kill the microalgal cells within 48 h with inactivation rate of 79% and above. Therefore, UV-C dose at 500 mJ/cm2 and above is better for rapid microalgae inactivation and debris removal. The effects of membrane disintegration and complete lysis of microalgal cell at 2~3 days after UV-C exposure are attributed to the inhibition of the photosynthetic activity, which leads to the increase in intracellular oxidative stress. The response of photosynthetic activity upon UV-C irradiation is very sensitive, much higher than the variations of cell density and membrane integrity. In addition, the photosynthetic activity can be quickly measured, only minutes for one sample. Thus, photosynthetic activity can be used as an indicator for the inactivation effect of UV-C irradiation on the Apatococcuslobatus as well as its recovery on the surface of the post insulation. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：557 / 563
页数：6
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