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Nitrogen removal via nitrite pathway and the related nitrous oxide emission during piggery wastewater treatment.

Authors
  • Rajagopal, Rajinikanth1
  • Béline, Fabrice
  • 1 Cemagref, UR GERE, 17, Avenue de Cucillé, CS 64427, F-35044 Rennes, France. , (France)
Type
Published Article
Journal
Bioresource technology
Publication Date
Mar 01, 2011
Volume
102
Issue
5
Pages
4042–4046
Identifiers
DOI: 10.1016/j.biortech.2010.12.017
PMID: 21237639
Source
Medline
Language
English
License
Unknown

Abstract

Performance of partial nitrification (PN) via nitrite (NO(2)(-)) pathway and the related nitrous oxide (N(2)O) emission during piggery wastewater treatment was investigated. Dissolved oxygen (DO) concentration and aeration pattern were selected as operational parameters to investigate the possibility of NO(2)(-) accumulation without affecting the overall N removal. To obtain PN, aeration was done for a maximum of 3h with a stopover of oxygenation, whenever DO concentration exceeds the threshold value of 2 mg O(2)L(-1). Ammonium (NH(4)(+)) consumption ended within 2h of reaction, and at the end of NH(4)(+) oxidation, about 70-80% of N was accumulated as NO(2)(-). Using PN, an average N removal of 74-75% was observed, which is comparable to that of complete nitrification-denitrification process. Regulating the aeration pattern not only benefit to the N removal in piggery wastewater, but also favoured reduction of oxygen and organic matter requirements for nitrification and denitrification. N(2)O emission was not encouraged even with 70-80% of NO(2)(-) accumulation. Copyright © 2010 Elsevier Ltd. All rights reserved.

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