期刊
ENVIRONMENTAL TECHNOLOGY
卷 41, 期 2, 页码 251-259出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2018.1494757
关键词
Dissolved oxygen; nitrous oxide; biological nitrogen removal; simultaneous nitrification and denitrification; aerobic granular sludge
资金
- Natural Science Foundation of Heilongjiang Province [ZD201412]
- Harbin Science and Technology Program [2016RAXXJ010]
Dissolved oxygen (DO) is an important factor influencing biological nitrogen removal. This study investigated the effects of different DO concentrations (4, 2, 1 mg/L) on nitrous oxide (N2O) production and nitrogen removal via shortcut simultaneous nitrification and denitrification by aerobic granular sludge (SNDAG) using a sequencing bath reactor. The results showed that N2O production was highest (127.6 mg/m(3)) at a DO concentration of 2 mg/L; this was 24.17 and 2.90 times the production at DO concentrations of 4 and 12 mg/L, respectively. The removal efficiency of total nitrogen also was the highest (61.68%) when the DO concentration was 2 mg/L, compared to 35.22% and 50.65% at DO concentrations of 4 and 1 mg/L, respectively. The efficiency of the SNDAG process reached 53.86% at a DO concentration of 2 mg/L, which was 1.33 and 1.67 times the efficiencies at DO concentrations of 4 and 1 mg/L, respectively. Therefore, reducing the DO concentration benefited the SNDAG process, but increased the emission of N2O. [GRAPHICS] .
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