Operation characteristics of the SPN/A process for municipal wastewater under low temperature shortcut nitrification sludge
WANG Si-meng, MIAO Yuan-yuan, PENG Yong-zhen
1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
In this study, feasibility of enhancing ammonia-oxidizing bacteria (AOB) activity by biological addition under the condition of temperature fluctuation and further improving the denitrification effect of Single-stage Partial Nitrification and Anammox (SPN/A) process in municipal wastewater treatment was investigated. Two sequencing batch reactors (SBR) SBR1 and SBR2 were operated in intermittent aeration. The controlled temperature was reduced from 30℃ gradient to 15℃ (30, 27, 24, 21, 18, 15℃), and then gradually increased to 30℃.Shortcut nitrification sludge was regularly added to SBR2 to enhance AOB activity during the cooling and heating process, and SBR1 was used as the control process. The results showed that SBR1 and SBR2 started successfully and run stably without shortcut nitrification sludge, and the nitrogen removal efficiency of SBR1 and SBR2 was good at 30℃. When the temperature was dropped to 15℃, the concentration of the ammonia nitrogen in effluents of of SBR1 and SBR2 were 36.38mg/L and 33.10mg/L, and the total nitrogen removal efficiency was 30.72% and 35.76%, respectively. Both rectors’ efficiency become worse in low temperature settings, SBR2 shown a better cold resistance performance. When temperature were increased gradient back to 30℃,the total nitrogen removal rates of SBR1 and SBR2 increased back to 52.43% and 63.60% respectively. The activity of bacteria in SBR1 and SBR2 decreased with the decrease of temperature, but the AOB activity of SBR2 was higher than that of SBR1. During the temperature rising stage, the activity of bacteria in SBR1 and SBR2 both increased, and the inhibition of nitrite-oxidizing bacteria (NOB) activity in SBR2 was continuously decreasing. The better denitrification performance of SBR2 was suspected because when the AOB activity of SBR2 was enhanced, more nitrite was produced, and the substrate of Anammox was increased, which resulted in the higher activity abundance of Anammox. Therefore, it was conclude that the AOB activity in SPN/A system can be enhanced by biological addition at low temperature, which can improve the resistance performance of the system to the temperature shocks and facilitate the recovery of denitrification capacity.
王思萌, 苗圆圆, 彭永臻. 低温投加短程硝化污泥下城市污水SPN/A工艺运行特性[J]. 中国环境科学, 2019, 39(4): 1456-1463.
WANG Si-meng, MIAO Yuan-yuan, PENG Yong-zhen. Operation characteristics of the SPN/A process for municipal wastewater under low temperature shortcut nitrification sludge. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1456-1463.
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