Short-cut Nitrification Start-up and Optimization of Operating Conditions Under Different Control Strategies

• Published in: Huanjing kexue Vol. 40; no. 10; p. 4569
• Main Authors: Liu, An-di, Zhao, Kai-Liang, Liu, Hong, Huang, Li, Ni, Rong, Chen, Yong-Zhi
• Format: Journal Article
• Language: Chinese
• Published: China 08.10.2019
• Subjects: temperature; material balance; alternating mode; shortcut nitrification; aerobic/anoxic time ratio
• ISSN: 0250-3301
• DOI: 10.13227/j.hjkx.201902011

Low C/N domestic sewage was treated in a SBR. With an operating temperature of (25±0.5)℃, NO -N accumulation rates reached 96.79%, 98.80%, and 98.78% after 69, 63, and 58 cycles, respectively. In each case, alternating modes of hypoxia/aerobic (four times), aerobic/anoxic (five times), and aerobic/anoxic (four times) were applied, respectively, with an alternating time of 30 min. At the same temperature, when the aerobic/anoxic time ratios were 30 min:30 min, 40 min:20 min, and 30 min:60 min, and the single-cycle alternating times were 5, 3, and 5, respectively, stable NO -N accumulation rates reached 98.81%, 97.71%, and 94.64% after 63, 73, and 78 cycles, respectively. The activity of AOB was 96.30, 99.27, and 102.26, respectively. Simultaneous nitrification and denitrification occurred under the three aerobic/anoxic time ratios. The total amounts of nitrogen removed by synchronous nitrification and denitrification were 29.89, 28.77, and 29.78 mg·L . When temperatures were adjusted to 18, 25, and 30℃, and wh