Center for Ecological Research, Northeast Forestry University, Harbin, People's Republic of China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, People's Republic of China.
Environ Technol. 2020 Jan;41(2):251-259. doi: 10.1080/09593330.2018.1494757. Epub 2018 Jul 24.
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 (NO) production and nitrogen removal via shortcut simultaneous nitrification and denitrification by aerobic granular sludge (SND) using a sequencing bath reactor. The results showed that NO production was highest (127.6 mg/m) 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 SND 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 SND process, but increased the emission of NO.
溶解氧（DO）是影响生物脱氮的重要因素。本研究采用序批式生物膜反应器，考察了不同 DO 浓度（4、2、1mg/L）对好氧颗粒污泥短程同步硝化反硝化（SND）过程中一氧化二氮（NO）生成和脱氮的影响。结果表明，在 DO 浓度为 2mg/L 时，NO 生成量最高（127.6mg/m），分别是 DO 浓度为 4mg/L 和 12mg/L 时的 24.17 倍和 2.90 倍。当 DO 浓度为 2mg/L 时，总氮去除效率最高（61.68%），分别比 DO 浓度为 4mg/L 和 1mg/L 时的 35.22%和 50.65%高。当 DO 浓度为 2mg/L 时，SND 工艺的效率达到 53.86%，分别是 DO 浓度为 4mg/L 和 1mg/L 时的 1.33 倍和 1.67 倍。因此，降低 DO 浓度有利于 SND 工艺，但会增加 NO 的排放。
