Implementing a completely autotrophic nitrogen removal over nitrite process using a novel umbrella basalt fiber carrier

Autor: Shan-Wei Li, Wei Xu, Yu-Jie Xie, Liang Fu, Qi Gao, Xiao-Chun Wang, Yan Li, Zhi-Ren Wu
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Water Science and Technology, Vol 90, Iss 1, Pp 270-286 (2024)
Druh dokumentu: article
ISSN: 0273-1223
1996-9732
DOI: 10.2166/wst.2024.188
Popis: The completely autotrophic nitrogen removal over nitrite (CANON) process is significantly hindered by prolonged start-up periods and unstable nitrogen removal efficiency. In this study, a novel umbrella basalt fiber (BF) carrier with good biological affinity and adsorption performance was used to initiate the CANON process. The CANON process was initiated on day 64 in a sequencing batch reactor equipped with umbrella BF carriers. During this period, the influent NH4+-N concentration gradually increased from 100 to 200 mg·L−1, and the dissolved oxygen was controlled below 0.8 mg L−1. Consequently, an average ammonia nitrogen removal efficiency (ARE) and total nitrogen removal efficiency (TNRE) of ∼90 and 80% were achieved, respectively. After 130 days, ARE and TNRE remained stable at 92 and 81.1%, respectively. This indicates a reliable method for achieving rapid start-up and stable operation of the CANON process. Moreover, Candidatus Kuenenia and Candidatus Brocadia were identified as dominant anammox genera on the carrier. Nitrosomonas was the predominant genus among ammonia-oxidizing bacteria. Spatial differences were observed in the microbial population of umbrella BF carriers. This arrangement facilitated autotrophic nitrogen removal in a single reactor. This study indicates that the novel umbrella BF carrier is a highly suitable biocarrier for the CANON process. HIGHLIGHTS The umbrella basalt fiber (BF) carrier CANON reactor achieved rapid start-up and stable operation.; There were spatial distribution differences between AOB and anammox bacteria in the umbrella BF carrier.; Umbrella BF carriers enhance the abundance and diversity of microbial communities.;
Databáze: Directory of Open Access Journals
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