调整气水比优化高氨氮废水BAF一体化脱氮

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Abstract

In order to achieve efficient removal of nitrogen from high ammonia nitrogen wastewater at room temperature, this study selected three gas water ratio conditions, 8:1、12:1 and 15:1 respectively. It investigated the stable operation performance of partial nitrification-ANAMMOX integrated autotrophic nitrogen removal process of biological aerated filter (BAF) at room temperature. The results showed that gas water ratio (GWR) at the optimal operation time was 15:1under the condition of inlet ammonia nitrogen (NH₄⁺-N) concentration of 400mg/L and reflux ratio of 1:1, ammonia nitrogen removal rate (ARE) was over 90%,total nitrogen (TN) removal load was 1.1kgN/(m³·d), and TN removal rate could reach 83%. When the GWR is 15:1,the DO is controlled around 2.41mg/L and 4.22mg/L, the amount of NH₄⁺-N converted into nitrite (NO₂^--N) in water increased, and the ANAMMOX activity is enhanced. The real-time fluorescence quantitative PCR (QPCR) analysis of functional strains on the biofilm showed that when the GWR was 15:1, both ANAMMOX and AOB had the highest abundance, more than 10¹² copies/g dry sludge. Therefore, integrated nitrogen removal has the best effect. At the same time, studies have shown that the ANAMMOX reaction is strengthened after increasing the gas water ratio and N₂O is not generated in the ANAMMOX process. When the GWR is 15:1, the total release amount of N₂O is the smallest, and the release factor is 0.0012.

Key words： BAF biofilm high ammonia nitrogen wastewater GWR molecular biology N₂O

Received: 28 February 2019

PACS:

X703.1

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	Articles by authors
	LI Hai-xin
	LIU Xiu-hong
	YANG Zhong-qi
	LIU Run-yu
	WU Wen-jun
	YANG Qing

Cite this article:

LI Hai-xin,LIU Xiu-hong,YANG Zhong-qi等. Optimization of the integrated nitrogen removal process of high ammonia nitrogen wastewater in BAF by adjusting the gas water ratio[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(9): 3807-3813.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I9/3807

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