Importance of the combined effects of dissolved oxygen and pH on optimization of nitrogen removal in anammox-enriched granular sludge

Zhixuan Yin; Carla Santos; Jaime Vilaplana; Dominika Sobotka; Krzysztof Czerwionka; Márcia Damianovic; Li Xie; Francisco Morales; Jacek Mąkinia

doi:10.1016/j.procbio.2016.05.025

Importance of the combined effects of dissolved oxygen and pH on optimization of nitrogen removal in anammox-enriched granular sludge

Abstract

The combined effects of dissolved oxygen (DO) and pH on nitrogen removal were investigated in a laboratory-scale sequencing batch reactor (SBR) with anammox-enriched granular sludge obtained from a nitritation/anammox system. The highest specific nitrogen removal rate (SNRR) (1.1 gN gVSS−1 d−1) was observed under non-aerated conditions, resulting in the nitrogen removal efficiency of 81.6%. Although nitrogen removal was readily inhibited under aerated conditions, an increased SNRR occurred at the DO concentration of 0.5 mg O2 L−1. This is in contrast with the directional DO suppression on nitrogen removal in the anammox process, indicating that other nitrogen conversion pathways, such as nitrification and endogenous denitrification, were also active in the studied reactor. The highest SNRRs were obtained within a pH range of 6.5–8.5, characterized by low concentrations of free ammonia (FA) and free nitrous acid (FNA). Oxygen-consuming bacteria (nitrifiers) were implicitly inhibited by the low pH so that less oxygen was utilized. In tests carried out using the optimum pH physiological range (6.5–8.5) for microorganisms, an explicit DO elbow was observed when the ammonium and nitrite were almost completely removed. This finding confirms the occurrence of nitrogen removal by the oxygen-consuming bacteria in the system studied.

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Authors (9)

Zhixuan Yin
- Tongji University State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering
Carla Santos
- University of São Paulo Laboratory of Biological Processes, Center for Research, Development and Innovations in Environmental Engineering, School of Engineering of São Carlos
Jaime Vilaplana
- University of Castilla-La Mancha Department of Chemical Engineering
Dominika Sobotka dr inż.
Krzysztof Czerwionka dr hab. inż.
Márcia Damianovic
- University of São Paulo Laboratory of Biological Processes, Center for Research, Development and Innovations in Environmental Engineering, School of Engineering of São Carlos
Li Xie
- Tongji University State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering
Francisco Morales
- University of Castilla-La Mancha Department of Chemical Engineering
Jacek Mąkinia prof. dr hab. inż.

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: PROCESS BIOCHEMISTRY no. 51, edition 9, pages 1274 - 1282,
ISSN: 1359-5113
Language:: English
Publication year:: 2016
Bibliographic description:: Yin Z., Santos C., Vilaplana J., Sobotka D., Czerwionka K., Damianovic M., Xie L., Morales F., Mąkinia J.: Importance of the combined effects of dissolved oxygen and pH on optimization of nitrogen removal in anammox-enriched granular sludge// PROCESS BIOCHEMISTRY. -Vol. 51, iss. 9 (2016), s.1274-1282
DOI:: Digital Object Identifier (open in new tab) 10.1016/j.procbio.2016.05.025
Verified by:: Gdańsk University of Technology