The aim of the study was to determine the pH effects on nitrogen removal in the anammox-enriched 10 granular sludge. The experimental data were extracted from a 4L completely-mixed batch reactor with the 11 granular sludge at different initial pH values (6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5) and constant temperature 12 T=30℃. Simulations were run in GPS-X 6.4 using a comprehensive mechanistic model Mantis2. Two 13 kinetic parameters, including the maximum specific growth rates of ammonia oxidizing bacteria (AOB) and 14 anammox bacteria were optimized at different pH scenarios. The inhibitory effects of the pH extremes on 15 the anammox-enriched sludge were discussed in terms of the inhibition of free nitrous acid (FNA) and free 16 ammonia (FA) and metabolic mechanisms. Two different pH functions were used to examine the pH effects 17 on the nitrogen removal kinetics. The pH optima for AOB and anammox bacteria were 7.4 and 7.6, 18 respectively. The maximum specific growth rates of AOB and anammox bacteria at the pH optima were 19 0.84 d-1 and 0.37 d-1 (at T=30℃). The measured specific anammox activities (SAAs), predicted SAAs by 20 Mantis2 and fitted SAAs by the Michaelis pH function at the pH optima were 0.895 gN/(gVSS·d), 0.829 21 gN/(gVSS·d) and 0.831 gN/(gVSS·d), respectively.
Authors
Additional information
- DOI
- Digital Object Identifier link open in new tab 10.2166/wst.2016.530
- Category
- Aktywność konferencyjna
- Type
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Language
- angielski
- Publication year
- 2016
