Implementing a completely autotrophic nitrogen removal over nitrite process using a novel umbrella basalt fiber carrier.
Water Sci Technol
; 90(1): 270-286, 2024 Jul.
Article
em En
| MEDLINE
| ID: mdl-39007319
ABSTRACT
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 â¼90 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.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Reatores Biológicos
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Processos Autotróficos
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Nitritos
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Nitrogênio
Idioma:
En
Revista:
Water Sci Technol
Ano de publicação:
2024
Tipo de documento:
Article