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Modeling the pH effects on nitrogen removal in the anammox-enriched granular sludge

Abstract

The aim of the study was to determine the pH effects on nitrogen removal in the anammox-enriched granular sludge. The experimental data were extracted from a 4L completely-mixed batch reactor with the granular sludge at different initial pH values (6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5) and constant temperature T=30℃. Simulations were run in GPS-X 6.4 using a comprehensive mechanistic model Mantis2. Two kinetic parameters, including the maximum specific growth rates of ammonia oxidizing bacteria (AOB) and anammox bacteria were optimized at different pH scenarios. The inhibitory effects of the pH extremes on the anammox-enriched sludge were discussed in terms of the inhibition of free nitrous acid (FNA) and free ammonia (FA) and metabolic mechanisms. Two different pH functions were used to examine the pH effects on the nitrogen removal kinetics. The pH optima for AOB and anammox bacteria were 7.4 and 7.6, respectively. The maximum specific growth rates of AOB and anammox bacteria at the pH optima were 0.84 d-1 and 0.37 d-1 (at T=30℃). The measured specific anammox activities (SAAs), predicted SAAs by Mantis2 and fitted SAAs by the Michaelis pH function at the pH optima were 0.895 gN/(gVSS·d), 0.829 gN/(gVSS·d) and 0.831 gN/(gVSS·d), respectively.

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Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
WATER SCIENCE AND TECHNOLOGY no. 75, edition 2, pages 378 - 386,
ISSN: 0273-1223
Language:
English
Publication year:
2017
Bibliographic description:
Lu X., Yin Z., Sobotka D., Wiśniewski K., Czerwionka K., Xie L., Zhou Q., Mąkinia J.: Modeling the pH effects on nitrogen removal in the anammox-enriched granular sludge// WATER SCIENCE AND TECHNOLOGY. -Vol. 75, iss. 2 (2017), s.378-386
DOI:
Digital Object Identifier (open in new tab) 10.2166/wst.2016.530
Verified by:
Gdańsk University of Technology

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