C/N对HN-AD菌藻颗粒污泥体系处理农村污水的影响

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Abstract The H-ABGS system was proposed by introducing heterotrophic nitrification-aerobic denitrification (HN-AD) bacteria into the traditional algal-bacterial aerobic granular sludge (ABGS) system. The effects of carbon to nitrogen (C/N) ratios (C/N=1,2,4,6,8,10) on the pollutant removal performance and microbial characteristics of the H-ABGS system for synthetic rural wastewater treatment were investigated. The results showed that the total nitrogen (TN) removal rate of the H-ABGS system was higher than that of the ABGS system (12.05%) and AGS system (44.86%) at a C/N ratio of 4. The microbial community analysis showed that Thauera bacteria and norank_f__A4b bacteria, which were adapted to the low carbon environment, might be the key to ensuring the high nitrogen removal performance of the H-ABGS system under low carbon condition. The symbiosis pattern and correlation analysis of microbial communities showed that the inoculation of HN-AD bacteria could help to minimize the ecological niche and form a stable symbiotic system with algae, thus ensuring the stability of the system. In addition, the high expression of nitrate reductase at a C/N ratio of 4might help to ensure the excellent nitrogen removal performance of the H-ABGS system.

Key words： algae-bacteria symbiosis heterotrophic nitrification-aerobic denitrification (HN-AD) bacteria microbial community nitrogen removal

Received: 14 July 2023

PACS:

X703.5

Corresponding Authors: 张千,副教授,zhangqianswu2005@163.com E-mail: zhangqianswu2005@163.com

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	LIU Huan
	YANG Chen-xi
	QIN Shu-min
	LONG Kun
	ZHAO Ting-ting
	ZHANG Qian

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LIU Huan,YANG Chen-xi,QIN Shu-min等. Effects of C/N on the treatment of rural wastewater by HN-AD bacterial-algal granular sludge system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(3): 1296-1306.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I3/1296

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