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Regulatory of salinity on assembly of activated sludge microbial communities and nitrogen transformation potential in industrial plants of the lower Yangtze River basin
Environmental Research ( IF 8.3 ) Pub Date : 2024-03-21 , DOI: 10.1016/j.envres.2024.118769 Yifan Jiang , Ding Ma , Jin Wang , Qingsheng Xu , Jintao Fang , Zhengbo Yue
Environmental Research ( IF 8.3 ) Pub Date : 2024-03-21 , DOI: 10.1016/j.envres.2024.118769 Yifan Jiang , Ding Ma , Jin Wang , Qingsheng Xu , Jintao Fang , Zhengbo Yue
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This study aims to thoroughly investigate the impact mode of salinity carried by industrial wastewater on the anaerobic-anoxic-oxic (AO) sludge in wastewater treatment plants (WWTPs). Through comprehensive investigation of the AO stage activated sludge (AS) from 19 industrial WWTPs in the downstream area of the Yangtze River, China, A total of 38 samples of anaerobic sludge and oxic sludge were collected and analyzed. We found that salinity stress significantly inhibits the growth of the AS community, particularly evident in the anaerobic sludge community. Furthermore, the high-saline environment induces changes in the structure and functional patterns of the AS community, leading to intensive interactions and resource exchanges among microorganisms. Halophilic microorganisms may play a crucial role in this process, significantly impacting the overall community structure, especially in the oxic sludge community. Additionally, salinity stress not only suppresses the nitrogen transformation potential of the AS but also leads to the accumulation of nitrite, thereby increasing the emission potential of both NO and NO, exacerbating the greenhouse effect of the AO process in industrial WWTPs. The findings of this study provide necessary theoretical support for maintaining the long-term stable operation of the AO sludge system in industrial WWTPs, reducing carbon footprint, and improving nitrogen removal efficiency.
更新日期：2024-03-21
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