Details

Autor(en) / Beteiligte

• Qian, Jie
• Luo, Di
• Yu, Peng-fei
• Ye, Bin
• Li, Ying-hua
• Wang, Yong-yong
• Gao, Yu-nan
• Fu, Jin-xiang

Titel

Insights into the reaction of anammox to exogenous pyridine: Long-term performance and micro mechanisms

Ist Teil von

• Bioresource technology, 2023-09, Vol.384, p.129273-129273, Article 129273

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2023

Quelle

MEDLINE

Beschreibungen/Notizen

• [Display omitted] •The long-term threat of pyridine to anaerobic ammonia was investigated.•The nitrogen removal efficiency was significantly reduced at 80 mg/L pyridine.•Long-term pyridine addition inhibited the expression of hzs and nirs for anammox.•The abundance of Candidatus_Kuenenia decreased 7.23% by the toxic effect of pyridine.•Pyridine binding to key proteins limited the use of anammox for substrates. Some industrial wastewaters contain high amounts of toxic nitrogen-containing heterocyclic compounds, which may inhibit the efficiency of biological treatment. This work systematically investigated how exogenous pyridine affected the anaerobic ammonia oxidation (anammox) system and discussed the microscopic response mechanisms based on genes and enzymes. The anammox efficiency was not seriously inhibited by pyridine less than 50 mg/L. Bacteria secreted more extracellular polymeric substances to resist pyridine stress. After 6 days stress with 80 mg/L pyridine, the nitrogen removal rate of anammox system lost 47.7%. Long-term stress of pyridine reduced anammox bacteria by 7.26% and the expression of functional genes by 45%. Pyridine could actively bind to hydrazine synthase and ammonium transporter. This work fills a research gap in the ongoing threat of pyridines to anammox, and has guiding value for the application of anammox process in the treatment of ammonia-rich wastewater containing pyridine.