Article ; Online: Impact of sulfamethoxazole and organic supplementation on mixotrophic denitrification process: Nitrate removal efficiency and the response of functional microbiota.
Journal of environmental management
2022 Volume 320, Page(s) 115818
Abstract: Recirculating aquaculture systems (RAS) effluent is characterized by low COD to total inorganic nitrogen ratio (C/N), excessive nitrate, and the presence of traces of antibiotics. Hence, it urgently needs to be treated before recycling or discharging. In ...
Abstract | Recirculating aquaculture systems (RAS) effluent is characterized by low COD to total inorganic nitrogen ratio (C/N), excessive nitrate, and the presence of traces of antibiotics. Hence, it urgently needs to be treated before recycling or discharging. In this study, four denitrification bioreactors at increasing C/N ratios (0, 0.7, 2, and 5) were started up to treat mariculture wastewater under the sulfamethoxazole (SMX) stress, during which the bioreactors performance and the shift of mixotrophic microbial communities were explored. The result showed that during the SMX exposure, organic supplementation enhanced nitrate and thiosulfate removal, and eliminated nitrite accumulation. The denitrification rate was accelerated by increasing C/N from 0 to 2, while it declined at C/N of 5. The decline was ascribed to which SMX reduced the relative abundance of denitrifiers, but improved the capability of dissimilatory nitrogen reduction to ammonia (DNRA) and sulfide production. The direct evidence was the relative abundance of sulfidogenic populations, such as Desulfuromusa, Desulfurocapsa, and Desulfobacter increased under the SMX stress. Moreover, high SMX (1.5 mg L |
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MeSH term(s) | Ammonia ; Bioreactors ; Denitrification ; Dietary Supplements ; Microbiota ; Nitrates ; Nitrogen ; Nitrogen Oxides ; Sulfamethoxazole ; Sulfides |
Chemical Substances | Nitrates ; Nitrogen Oxides ; Sulfides ; Ammonia (7664-41-7) ; Sulfamethoxazole (JE42381TNV) ; Nitrogen (N762921K75) |
Language | English |
Publishing date | 2022-08-06 |
Publishing country | England |
Document type | Journal Article |
ZDB-ID | 184882-3 |
ISSN | 1095-8630 ; 0301-4797 |
ISSN (online) | 1095-8630 |
ISSN | 0301-4797 |
DOI | 10.1016/j.jenvman.2022.115818 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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