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The role of the combined nitrogen-sulfur-carbon cycles for efficient performance of anammox-based systems
Abstract
The combined anammox/mixotrophic denitrification process was conducted in two granular sequencing batch reactors (SBRs) during a 200-day operation. Both reactors were fed with synthetic medium, but SBR2 was enriched with additional sulfate (SO4 2 ) which influenced sulfate reduction ammonium oxidation (SRAO) and heterotrophic reduction of SO4 2 by sulfate reducing bacteria. It was hypothesized that the addition of SO4 2 could positively impact the removal rates of N-S-C compounds. A low C/N ratio (0.4–1.6) was maintained to prevent inhibition of anaerobic ammonium oxidizing bacteria (AnAOB), and alternating chemical oxygen demand (COD) on/off conditions were used to regenerate AnAOB during COD-off phases and heterotrophic denitrifiers during COD-on phases. Stoichiometric analysis showed that introducing SO4 2 in SBR2 enhanced the ammonium utili zation rate, which was approximately 10 % higher compared to SBR1 in the final stage of the experiment (25.8 vs. 22.8 mg N/(g VSS⋅h)). The total nitrogen removal efficiencies ranged from 62 % to 99 % in both reactors, with SBR2 consistently exhibiting approximately 4 % higher efficiency than SBR1. In SBR2, the maximum overall SO4 2 utilization efficiency reached 27 % under COD-off conditions, while overall COD utilization was almost complete under COD-on conditions. A strong correlation (R2 =0.98) was observed between SO4 2 production and COD utilization. The key players responsible for N and S transformations in response to SO4 2 addition were Candidatus Brocadia and Chloroflexi - Anaerolineae. This study highlights the potential to enhance the overall efficiency of N-S-C removal by implementing an integrated anammox/mixotrophic denitrification process. The combination of cycles emerges as a sustainable approach for treating wastewater rich in N-S-C compounds.
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Authors (6)
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Slawomir Ciesielski
- Uniwersytet Warmińsko-Mazurski
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Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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SCIENCE OF THE TOTAL ENVIRONMENT
no. 917,
ISSN: 0048-9697 - Language:
- English
- Publication year:
- 2024
- Bibliographic description:
- Derwis D., Al-Hazmi H., Majtacz J., Kowal P., Ciesielski S., Mąkinia J.: The role of the combined nitrogen-sulfur-carbon cycles for efficient performance of anammox-based systems// SCIENCE OF THE TOTAL ENVIRONMENT -,iss. 917 (2024),
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.scitotenv.2024.170477
- Sources of funding:
- Verified by:
- Gdańsk University of Technology
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