Open AccessThe effect of S/N ratio on NO and N2O accumulation during sulfide autotrophic denitrification
Author(s) -
Shuting Xie,
Jianqiang Zhao,
Wei Dai,
Shuhan Lei,
Junkai Zhao,
Yan Cao,
Xiaoqing Ma,
Jia Min
Publication year - 2022
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/983/1/012104
Subject(s) - denitrification , autotroph , nitrous oxide , chemistry , thiobacillus , competition (biology) , nitrogen , sulfide , environmental chemistry , ecology , bacteria , biology , sulfur , organic chemistry , genetics
Nitro oxide (NO) and Nitrous oxide (N 2 O) are inevitable intermediates of sulfide autotrophic denitrification (SAD) process, and have huge environmental hazard. This study investigated the produce mechanism and accumulation characteristic of NO and N 2 O in SAD process under different S/N ratios. The results showed that the lower S/N ratio, the higher NO accumulation. Which was due to the strong reducing effect of S 2 - and the electronic competition between nitrogen reductase. And under S/N ratio = 2, N 2 O level reached its peak, which was caused by electronic competition. When the S/N ratio = 1, although the electronic competition was more intense, the total amount of electrons was less, thus the N 2 O produced is lower than that produced when S/N=2. Microbial community analysis showed that Thiobacillus sp. (62.44%) was the predominant genus, and conducted the suldide-oxiding autotrophic denitrification process.