Issue 4, 2020

Faster removal of nitrite than nitrate in sulfur-based autotrophic denitrification coupled with anammox, affected by the anammox effluent

Abstract

Nitrite is normally removed slower than nitrate in sulfur-based autotrophic denitrification (SADN), and this may cause nitrite accumulation and decrease the efficiency of nitrogen removal. However, this study shows that nitrite was removed faster by SADN coupled with anaerobic ammonium oxidation (anammox). Both a coupled system and a control system were established to verify the preferential nitrite removal process and to explore the potential causes. The results showed that the removal efficiencies of nitrite and nitrate in SADN of the coupled system were 100% and 69.9%, respectively, under excess nitrite. In anammox effluent, the pH and ORP increased to 8.60 ± 0.11 and −286 ± 21.92 mV, respectively, jointly creating suitable reduction conditions for preferential nitrite removal. Furthermore, the protein-like substances present, C10-HSL and C14-HSL, were increased by 1130.875 a.u. to 5.35 and 1.13 ng L−1, respectively. These changes promoted the activity of nitrite reductase and the abundance of Longilinea, Thiobacillus, and Methyloversatilis. The synergistic effect of material flow and information flow in the coupled system caused preferential nitrite removal. This study provides new insight towards solving the nitrite accumulation problem in the practical nitrogen removal process.

Graphical abstract: Faster removal of nitrite than nitrate in sulfur-based autotrophic denitrification coupled with anammox, affected by the anammox effluent

Supplementary files

Article information

Article type
Communication
Submitted
25 Qun 2020
Accepted
21 Nah 2020
First published
21 Nah 2020

Environ. Sci.: Water Res. Technol., 2020,6, 916-924

Faster removal of nitrite than nitrate in sulfur-based autotrophic denitrification coupled with anammox, affected by the anammox effluent

T. Wang, J. Guo, C. Lu, H. Li, Y. Han, Y. Song, Y. Hou and J. Zhang, Environ. Sci.: Water Res. Technol., 2020, 6, 916 DOI: 10.1039/D0EW00065E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements