SNAD工艺在不同间歇曝气工况下的脱氮性能

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Abstract The simultaneous partial nitrification, anammox and denitrification (SNAD) process for treating domestic wastewater was investigated under high dissolved oxygen (DO) concentration. Intermittent aerobic condition was operated in a sequencing batch reactor (SBR) with the air flow rate of 500L/h at 30℃. The DO concentration was up to 5mg/L. Domestic wastewater was used as influent and Kaldnes rings were used as biomass carriers. In phase 1, the reactor was operated with the aerobic time and non-aerobic time of both 20min. As a result, the biofilm performed low nitrite oxidizing bacteria (NOB) activity and the reactor achieved high nitrogen removal performance. The average total inorganic nitrogen (TIN) removal efficiency reached 89% with the average effluent TIN concentration of 11mg/L. Besides, the effect of the aerobic time on the SNAD biofilm reactor performance was evaluated during phase 2, phase 3 and phase 4. The results showed that the length of aerobic time played a little effect on the anammox activity of the SNAD biofilm, while the NOB activity was largely affected by the length of aerobic time. In phase 3, the aerobic time was controlled at 60min. As a result, the biofilm performed low NOB activity and the reactor achieved high nitrogen removal performance. The average TIN removal efficiency reached 83% with the average effluent TIN concentration of 14mg/L. The aerobic time of phase 4was controlled at 160min. On the contrary, the biofilm performed high NOB activity and the reactor performed poor nitrogen removal performance. The average TIN removal efficiency decreased to 50% with the average effluent TIN concentration of 35mg/L.

Key words： SNAD biofilm reactor domestic wastewater different intermittent aerobic conditions

Received: 30 May 2016

PACS:

X703.5

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	ZHENG Zhao-ming
	LI Jun
	YANG Jing-yue
	Du Jia

Cite this article:

ZHENG Zhao-ming,LI Jun,YANG Jing-yue等. Nitrogen removal performance of the SNAD process under different intermittent aerobic conditions[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(2): 511-519.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I2/511

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