Issue 10, 2023

Enhanced nitrogen removal in constructed wetlands with a multistage-A/O process

Abstract

In this study, the performance of a multistage-A/O process in constructed wetlands (CWs) was compared with the A/O/A process in terms of its ability for nitrogen (N) and phosphorus (P) removal under carbon-limited conditions. Simultaneous nitrification and endogenous denitrification (SNED) was found to be the predominant nitrogen removal pathway in both systems. The SNED rate for the multistage-A/O system was 92.49%, higher than 65.63% for the A/O/A system. Moreover, partial nitrification and endogenous partial denitrification (shortcut SNED) via nitrite was found to be 59.46% in the multistage-A/O system, which was greater than 41.48% observed in the A/O/A system. Microbial community analysis of the nitrite oxidizing bacteria (NOB) to ammonia oxidizing bacteria (AOB) ratio in the multistage-A/O system showed a value of 2.05 compared to 4.95 in the A/O/A system, presenting the superior advantage of multistage-A/O in NOB inhibition. Additionally, the ratio of glycogen-accumulating organisms (GAOs) to polyphosphate-accumulating organisms (PAOs) was 4.95 in the multistage-A/O system, much lower than 10.17 in the A/O/A system, due to the suppression of aerobic GAOs (AGAOs) in the multistage-A/O system. Thus, the multistage-A/O process in CWs is a promising technology for carbon-limited wastewater treatment.

Graphical abstract: Enhanced nitrogen removal in constructed wetlands with a multistage-A/O process

Article information

Article type
Paper
Submitted
19 Apr 2023
Accepted
25 Jun 2023
First published
04 Jul 2023

Environ. Sci.: Water Res. Technol., 2023,9, 2472-2486

Enhanced nitrogen removal in constructed wetlands with a multistage-A/O process

J. Chen, J. Wang, X. Wang, Y. Lv, R. Chen, J. Xu, D. Li, J. Hou and X. He, Environ. Sci.: Water Res. Technol., 2023, 9, 2472 DOI: 10.1039/D3EW00272A

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