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

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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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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

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