Effects of temperature on N2O production in the process of nitrogen removal by micro-expansion aerobic granular sludge. Issue 59 (19th December 2016)

• Record Type: Journal Article
• Authors: Chen, Li-Li; Wen, Zhi-Dan; Wang, Wei-Hua; Liang, Hong; Gao, Da-Wen
• Is Part Of: Desalination and water treatment. Volume 57:Issue 59(2016)
• Page Start: 28743
• Page End: 28748
• Publication Date: 2016-12-19
• Subjects: Aerobic granular sludge -- N2O emission -- Simultaneously nitrification and denitrification (SND) -- Biological nitrogen removal -- Wastewater treatment; Saline water conversion -- Periodicals; Saline water conversion; Water -- Purification; Periodicals; 628.167
• DOI: 10.1080/19443994.2016.1187089
• Languages: English
• ISSNs: 1944-3994

Abstract

Abstract: An SBR reactor was used to study the effect of temperature on N2 O production in the process of nitrogen removal by micro-expansion aerobic granular sludge, as well as the removal efficiency of COD and ammonia nitrogen. The experiments were conducted at 21 ± 0.5°C, 26 ± 0.5°C, and 31 ± 0.5°C with low dissolved oxygen. The results showed that simultaneous nitrification and denitrification occurred in this system. The temperature had a significant influence on N2 O production and N2 O release rate; both increased with temperature going up. The ratios of N2 O production to the influent nitrogen loading rate at 31 ± 0.5°C, 26 ± 0.5°C, and 21 ± 0.5°C were 8.07, 5.37, and 3.93%, respectively, which are higher than aerobic granular sludge. N2 O release was 0.96 mg/m 3 at 31 ± 0.5°C, which was 1.43 and 1.37 times the production at 21 ± 0.5°C and 26 ± 0.5°C, respectively, and dissolved N2 O production was 1.46 ± 0.05 mg/m 3 at 31 ± 0.5°C, which was 2.86 and 1.60 times the production at 21 ± 0.5°C and 26 ± 0.5°C, respectively. As a result, 26°C is recommended as a suitable temperature for reducing N2 O emission and maintaining nitrogen removal efficiency in wastewater treatment.