Changes in microbial structure in the anammox population at high-temperature

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Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi
Cilt: 31 Sayı: 6
Changes in microbial structure in the anammox population at high-temperature

Changes in microbial structure in the anammox population at high-temperature

Pages : 1060-1072

View : 35 | Download : 198

Publication Date : 2025-11-13

Article Type : Research Paper

Abstract :Anammox bacteria are crucial in converting ammonia nitrogen into N2 gas in anoxic conditions, offering sustainable alternatives to biological wastewater treatment. However, temperature fluctuations in wastewater treatment plants significantly impact the activity of microorganisms, including anammox bacteria. This underscores the importance of understanding the influence of temperature on microbial ecology. Although extensive research has been conducted on anammox activity across various temperatures, the effects of high temperatures on microbial diversity within anammox consortia remain largely unexplored. This study aims to investigate the effects of high temperatures on microbial performance and shifts in microbial diversity in anammox bioreactors. Two separate bioreactors were employed to validate the findings. After enriching anammox cultures under mesophilic conditions, the bioreactors were exposed to 65°C for 9 hours, followed by a recovery phase at 35°C. Thermal stress led to a sharp decline in nitrogen removal efficiency, with NH4+-N and NO2--N removal rates decreasing by up to 83.59% and 91.35%, respectively. Even after reducing influent concentrations, nitrogen removal performance remained impaired. Metagenomic analyses revealed substantial shifts in microbial composition at elevated temperatures. While phyla such as Chloroflexi and Bacteroidota diminished, Proteobacteria and Firmicutes proliferated. Notably, Candidatus Kuenenia (anammox genus) declined, indicating its sensitivity to thermal stress. These findings provide valuable insights into how high temperatures influence microbial diversity in anammox systems. Future research should focus on improving microbial resilience and stability to optimize anammox system performance in harsh environmental conditions.
Keywords : Anammox, Atık su arıtımı, Yüksek sıcaklık, Metagenomik, Mikrobiyal kompozisyon

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