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Bioresour Technol. 2018 Jun;257:137-146. doi: 10.1016/j.biortech.2018.02.042. Epub 2018 Feb 10.

Pathway governing nitrogen removal in artificially aerated constructed wetlands: Impact of aeration mode and influent chemical oxygen demand to nitrogen ratios.

Author information

1
College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China; Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan 430070, China.
2
College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China.
3
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China.
4
College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China; Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan 430070, China. Electronic address: xufama@mail.hzau.edu.cn.

Abstract

This study aimed at assessing the influence of aeration mode and influent COD/N ratio on nitrogen removal in constructed wetlands (CWs). The results showed that a simultaneous partial nitrification, anammox and denitrification (SNAD) process was established in the intermittent aerated V1. While nitrogen removal pathway gradually changed from partial nitrification-denitrification to complete nitrification-denitrification along with reducing COD/N ratio in the continuous limited aerated V2. Effective inhibition of NOBs under intermittent aeration conditions, good retention of anammox bacteria biomass and much faster depletion of COD prior to substantial NH4+-N conversion jointly led to the successful achievement of stable SNDA process with elevated influent COD/N ratios in V1. Furthermore, the presence of SNAD ensured a robust ammonium (84-92%) and TN (80-91%) removal efficiency in V1 under varying COD loading rates. In contrast, the TN removal efficiency decreased rapidly along with the reducing influent COD/N ratios in V2.

KEYWORDS:

Anammox; Biological nitrogen removal; Constructed wetlands; Influent COD/N; Intermittent aeration

PMID:
29499495
DOI:
10.1016/j.biortech.2018.02.042
[Indexed for MEDLINE]

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