Journal
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Volume 97, Issue 12, Pages 3283-3291Publisher
WILEY
DOI: 10.1002/jctb.7227
Keywords
ammonium load; ammonium oxidizing bacteria; continuous nitritation; control parameters; dissolved oxygen; nitrite oxidizing bacteria
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Funding
- Mexican Council for Science and Technology, CONACYT [A1-S-10079]
- DGAPA-UNAM [TA100121]
- CONACYT [40872]
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This study showed that controlling the ammonium loading rate is the most important parameter for achieving efficient and stable nitritation. Continuous nitritation was achieved by using an easy-to-implement aeration strategy.
Background Partial oxidation of ammonium to nitrite, process known as nitritation, has important advantages over complete nitrification, including energy savings due to a reduced aeration, a lower organic carbon requirement for denitrification, a reduced production of sludge, and the potential use of nitrite in anammox and anoxic biogas purification technologies. Dissolved O-2 (DO) concentration commonly has been regarded as the most important parameter to be controlled for achieving a successful nitritation process. Results The present study showed that setting average DO values below 1 g O-2 m(-3) was insufficient to achieve a high and stable nitritation at ammonium loading rates between 2.5 to 5.1 g N-NH4+ m(-3) h(-1). Under these conditions, the predominance of nitrite oxidizing bacteria (NOB) resulted in ammonium oxidation selectivity to nitrite from 5.2 +/- 3.6% to 42.8 +/- 21%. Increasing the ammonium loading to 10.1 gN-NH4+ m(-3) h(-1) together with an average DO value of 0.9 +/- 0.6 gO(2) m(-3) resulted in an ammonium oxidation efficiency of 94 +/- 1.1% and ammonium oxidation selectivity to nitrite >90%. Conclusion Continuous nitritation was achieved in a single reactor provided with an easy-to-implement aeration strategy. The ammonium loading rate was the most important parameter to be controlled, which inhibited NOB above a threshold value. NOB inhibition was mediated mainly by free nitrous acid, and by free ammonia to a lesser extent. Increasing the ammonium loading rate led to an enrichment of ammonium oxidizing bacteria of the Nitrosomonas genus. (c) 2022 Society of Chemical Industry (SCI).
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