Denitrification performance and mechanism of denitrification biofilm reactor based on carbon-nitrate counter-diffusional.
Counter-diffusional
Denitrification mechanism
Denitrification performance
Nitrite accumulation
Organic carbon sources
Journal
Bioresource technology
ISSN: 1873-2976
Titre abrégé: Bioresour Technol
Pays: England
ID NLM: 9889523
Informations de publication
Date de publication:
Mar 2022
Mar 2022
Historique:
received:
17
12
2021
revised:
27
01
2022
accepted:
28
01
2022
pubmed:
9
2
2022
medline:
25
2
2022
entrez:
8
2
2022
Statut:
ppublish
Résumé
This study researched denitrification performance and mechanism of denitrification biofilm reactor with different HRTs and carbon sources dosages. Experimental group (EG) had better nitrate and COD removal performance than control group (CG) with different HRTs or carbon doses, and the maximum nitrate-to-nitrite transformation ratio (NTR) of them reached 7.91 ± 1.60% and 17.50 ± 1.92%, respectively. Because organic carbon sources were added to the carrier's interior in EG, forming high local concentrations in biofilms and counter-diffusional with nitrate. By contrast, carbon sources and nitrate were provided from the aqueous phase in CG. Thus, the EG system has more active regions of the biofilm than CG. In addition, EG had higher proportions of microorganisms and enzymes related to denitrification and carbon metabolism. The most dominant phylum, genus, and species were Proteobacteria, Thaurea, and Thauera_sp._27, respectively. The transcript of acetyl-CoA synthetase (K01895) and denitrification (M00529) was mainly originated from unclassified_g__Pseudomonas and unclassified_g__Thauera, respectively.
Identifiants
pubmed: 35131456
pii: S0960-8524(22)00133-X
doi: 10.1016/j.biortech.2022.126804
pii:
doi:
Substances chimiques
Nitrates
0
Carbon
7440-44-0
Nitrogen
N762921K75
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
126804Informations de copyright
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