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- W1575472333 abstract "Nitrogen removal from sludge reject water was obtained by oxygen-limited partial nitritation resulting in nitrite accumulation in a first stage, followed by autotrophic denitrification of nitrite with ammonium as electron donor (similar to anaerobic ammonium oxidation) in a second stage. Two membrane-assisted bioreactors (MBRs) were used in series to operate with high sludge ages and subsequent high volumetric loading rates, achieving 1.45 kg N m-3 day-1 for the partial nitritation MBR and 1.1 kg N m-3 day-1 for the anaerobic ammonium oxidation MBR. Biomass retention in the nitritation stage ensured flexibility towards loading rate and operating temperature. Nitrite oxidisers were out-competed at low oxygen and high free ammonia concentration. Biomass retention in the second MBR prevented wash-out of the slowly growing bacteria. Nitrite and ammonium were converted to dinitrogen gas in a reaction ratio of 1.05, thereby maintaining nitrite limitation to assure process stability. The anoxic consortium catalysing the autotrophic denitrification process consisted of Nitrosomonas-like aerobic ammonium oxidizers and anaerobic ammonium oxidizing bacteria closely related to Kuenenia stuttgartiensis. The overall removal efficiency of the combined process was 82% of the incoming ammonium according to a total nitrogen removal rate of 0.55 kg N m-3 day-1, without adding extra carbon source." @default.
- W1575472333 created "2016-06-24" @default.
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- W1575472333 date "2004-03-01" @default.
- W1575472333 modified "2023-10-02" @default.
- W1575472333 title "Nitrogen removal from sludge reject water by a two-stage oxygen-limited autotrophic nitrification denitrification process" @default.
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- W1575472333 doi "https://doi.org/10.2166/wst.2004.0737" @default.
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