Effects of carbon source on N<sub>2</sub>O production in the process of simultaneous nitrification and denitrifica-tion via nitrite by aerobic granular sludge

Authors

  • Hong Liang
  • Xue Li
  • Shanshan Wang
  • Dawen Gao

DOI:

https://doi.org/10.18063/AEB.2016.02.002.

Keywords:

carbon source, C/N ratio, N2O, nitrogen removal, SND, aerobic granular sludge

Abstract

A sequencing batch reactor (SBR) was used to study the effect of carbon source (C6H12O6 and CH3COONa) and C/N ratio (C/N=4:1 and C/N=7:1) on the production of nitrous oxide (N2O) in the process of simultaneous nitrifica-tion and denitrification via nitrite (short-cut SND) by aerobic granular sludge and the removal efficiency of nitrogen under low dissolved oxygen (DO). The results showed that short-cut SND occurred in this system, and the removal ef-ficiency of total nitrogen (TN) at C6H12O6 and CH3COONa were 28.93 % and 41.19 %, respectively. However, the production of N2O significantly increased when CH3COONa was used as a carbon source. In addition, the rate of N2O release when CH3COONa was a carbon source was 8.34 times the rate when C6H12O6 was the carbon source. With the increase of C/N, removal rate of TN and the efficiency of the short-cut SND were increased. The removal efficiency of TN at C/N=7:1 was 90.33%, which was 2.19 times at C/N=4:1. The percentage of short-cut SND at C/N=4:1 and C/N=7:1 were 87.47% and 95.97%, respectively. The release rate of N2O from the original 1.14 mg/(g • min) decreased to 0.10 mg/(g • min) after increased the C/N from 4:1 to 7:1.

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Published

2016-11-01

Issue

Vol. 1 No. 2 (2016): Volume 1 Issue 2

Section

RESEARCH ARTICLES

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