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Modelling of simultaneous nitrogen and thiocyanate removal through coupling thiocyanate-based denitrification with anaerobic ammonium oxidation.
- Source :
-
Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2019 Oct; Vol. 253, pp. 974-980. Date of Electronic Publication: 2019 Jul 20. - Publication Year :
- 2019
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Abstract
- Thiocyanate (SCN <superscript>-</superscript> )-based autotrophic denitrification (AD) has recently been demonstrated as a promising technology that could be integrated with anaerobic ammonium oxidation (Anammox) to achieve simultaneous removal of nitrogen and SCN <superscript>-</superscript> . However, there is still a lack of a complete SCN <superscript>-</superscript> -based AD model, and the potential microbial competition/synergy between AD bacteria and Anammox bacteria under different operating conditions remains unknown, which significantly hinders the possible application of coupling SCN <superscript>-</superscript> -based AD with Anammox. To this end, a complete SCN <superscript>-</superscript> -based AD model was firstly developed and reliably calibrated/validated using experimental datasets. The obtained SCN <superscript>-</superscript> -based AD model was then integrated with the well-established Anammox model and satisfactorily verified with experimental data from a system coupling AD with Anammox. The integrated model was lastly applied to investigate the impacts of influent NH <subscript>4</subscript> <superscript>+</superscript> -N/NO <subscript>2</subscript> <superscript>-</superscript> -N ratio and SCN <superscript>-</superscript> concentration on the steady-state microbial composition as well as the removal of nitrogen and SCN <superscript>-</superscript> . The results showed that the NH <subscript>4</subscript> <superscript>+</superscript> -N/NO <subscript>2</subscript> <superscript>-</superscript> -N ratio in the presence of a certain SCN <superscript>-</superscript> level should be controlled at a proper value so that the maximum synergy between AD bacteria and Anammox bacteria could be achieved while their competition for NO <subscript>2</subscript> <superscript>-</superscript> would be minimized. For the simultaneous maximum removal (>95%) of nitrogen and SCN <superscript>-</superscript> , there existed a negative relationship between the influent SCN <superscript>-</superscript> concentration and the optimal NH <subscript>4</subscript> <superscript>+</superscript> -N/NO <subscript>2</subscript> <superscript>-</superscript> -N ratio needed.<br /> (Copyright © 2019 Elsevier Ltd. All rights reserved.)
Details
- Language :
- English
- ISSN :
- 1873-6424
- Volume :
- 253
- Database :
- MEDLINE
- Journal :
- Environmental pollution (Barking, Essex : 1987)
- Publication Type :
- Academic Journal
- Accession number :
- 31352189
- Full Text :
- https://doi.org/10.1016/j.envpol.2019.07.104