Characteristics of nitrogen removal and nitrous oxide production in CANON process. Issue 4 (22nd July 2013)

• Record Type: Journal Article
• Authors: Xiao, Pengying; Cai, Qing; Zhang, Daijun; Yao, Zongbao; Lu, Peili
• Is Part Of: Journal of chemical technology & biotechnology. Volume 89:Issue 4(2014:Apr.)
• Page Start: 552
• Page End: 558
• Publication Date: 2013-07-22
• Subjects: Biotechnology -- Periodicals; Chemistry, Technical -- Periodicals; Chemical engineering -- Periodicals; Industries -- Environmental aspects -- Periodicals; 660
• DOI: 10.1002/jctb.4153
• Languages: English
• ISSNs: 0268-2575

Abstract

<abstract abstract-type="main" id="jctb4153-abs-0001"> <title>Abstract</title> <sec id="jctb4153-sec-0001" sec-type="section"> <title>BACKGROUND</title> <p id="jctb4153-para-0001"> <bold>Ammonia (NH<sub>3</sub>) was converted to dinitrogen gas (N<sub>2</sub>) cooperating between ammonia‐oxidizing bacteria (AOB) and anaerobic ammonia‐oxidizing bacteria (AnAOB) with low amounts of nitrous oxide (N<sub>2</sub>O) as the side‐product in the completely autotrophic nitrogen removal over nitrite (CANON) process. Contributions of anaerobic ammonia oxidation (anammox) by AnAOB and nitrifer denitrification by AOB for nitrogen (N) removal and the characteristics of N<sub>2</sub>O production were investigated comprehensively in this study</bold>.</p> </sec> <sec id="jctb4153-sec-0002" sec-type="section"> <title>RESULTS</title> <p id="jctb4153-para-0002"> <bold>AnAOB was the dominant contributor to autotrophic nitrogen removal, and the contributions from nitrifier denitrification were less than 13.55% of the N removal. Nitrite (NO<sub>2</sub><sup>‐</sup>) addition increased the N removal rate of the CANON process under oxygen limiting conditions; N<sub>2</sub>O primarily produced from nitrifier denitrification by AOB was 0.41–7.25% of the N removal, and there was a positive correlation between NO<sub>2</sub><sup>‐</sup> concentration and N<sub>2</sub>O production. Under anaerobic conditions, 10 mmol L<sup>−1</sup> methanol did not completely inhibit the activity of AnAOB, but N<sub>2</sub>O production rate was significantly decreased with the addition of methanol</bold>.</p> </sec> <sec id="jctb4153-sec-0003" sec-type="section"> <title>CONCLUSION</title> <p id="jctb4153-para-0003"> <bold>The contribution from nitrifier denitrification by AOB was less than 13.55% of the N removal, and AnAOB played an impotent role in N<sub>2</sub>O production by providing hydroxylamine as an electron donor for AOB to reduce NO<sub>2</sub><sup>‐</sup> in the CANON process. © 2013 Society of Chemical Industry</bold> </p> </sec> </abstract>