Microbial community characteristics of wastewater treatment systems in high-altitude and cold regions
FANG De-xin1, JI Fang-ying1, XU Xiao-yi1,2, XIONG Jing-zhong3
1. State Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Chongqing University, Chongqing 400045, China;
2. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
3. China Airport Construction Group Corporation Southwest Branch, Chengdu 610202, China
To investigate the microbial structure and diversity of the wastewater treatment systems in plateau and cold regions, three plateau wastewater treatment plants (WWTPs) in Lhasa, Yunnan and Sichuan were chosen as experimental group, and two non-plateau WWTPs in Chongqing were used for comparison. Polymerase chain reaction-Denaturing gradient gel electrophoresis (PCR-DGGE) was adapted to reveal the microbial characteristics of plateau and non-plateau WWTPs. The cluster results showed that plateau samples exhibited far distances from non-plateau samples, and the microbial community displayed an apparent difference. The average diversity of plateau WWTPs was lower than that of non-plateau WWTPs, which might be due to the significant inhibitory effect of ultraviolet (UV) radiation in plateau regions. As a result, the pollutant removal efficiency in plateau WWTPs was not satisfied as expected. For community composition, a total of 16genera were identified, which belong to the phyla of Proteobacteria, Bacteroidetes, Firmicutes and Verrucomicrobia. The difference analysis between groups showed that there was only one genus, Prosthecobacter, significantly enriched in plateau group, which is widely distributed in WWTPs and can adapt to the low temperature in the plateau. But for most activated sludge bacteria, high altitude and UV irradiation is an unfavorable living condition. Therefore, shading the UV radiation for the open WWTPs is a potential way to improve the wastewater treatment performance in plateau and cold regions.
方德新, 吉芳英, 许晓毅, 熊京忠. 高原高寒污水处理系统的微生物群落特征[J]. 中国环境科学, 2020, 40(3): 1081-1088.
FANG De-xin, JI Fang-ying, XU Xiao-yi, XIONG Jing-zhong. Microbial community characteristics of wastewater treatment systems in high-altitude and cold regions. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(3): 1081-1088.
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