期刊
JOURNAL OF WATER PROCESS ENGINEERING
卷 39, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jwpe.2020.101694
关键词
Anammox; Microbial interaction; Nutrient metabolism; Quorum sensing; Feeding pattern
资金
- National Natural Science Foundation of China [51738005]
The successful start-up of anaerobic ammonium oxidization (anammox) system is crucial for its application. Two different feeding patterns (pulse and constant) were studied, with pulse feeding showing quicker start-up and reaching steady state faster than constant feeding. Heterotrophs and other microorganisms play important roles in nitrogen and carbon metabolisms, while a quorum sensing system was also found in the anammox system. Complex microbial interactions such as competition, cooperation, and cross-feeding were observed and had an impact on system performance.
Successful start-up of the anaerobic ammonium oxidization (anammox) system is the main challenge for its application. Two anammox biofilm systems with pulse feeding pattern (AN-P) and constant feeding pattern (AN-C) were operated, and the performance of nitrogen removal and microbial interactions among anammox bacteria, heterotrophs, and other microorganisms were investigated. The total nitrogen removal percentage reached 82% (AN-P) and 82.4% (AN-C) in 13 days and 32 days, respectively. AN-P could start up and reach steady state quicker than AN-C. Candidatus Kuenenia was the dominant functional microorganism in both reactors. Heterotrophs (Pseudomonas and Hyphomicrobium) might play important roles in nitrogen and carbon metabolisms. N-decanoyl-DL-homoserine lactone and N-dodecanoyl-DL-homoserine lactone were detected, and acyl homoserine lactone-based quorum sensing system existed in the anammox system. Complex microbial interactions, including competition, cooperation and cross-feeding co-existed in the anammox system and affected system performance.
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