曝气策略调控CANON工艺降温降基质稳定运行

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Abstract

The feasibility of the stable operation of a sequencing biofilm batch reactor (SBBR) for completely autotrophic nitrogen removal over nitrite (CANON) was investigated using aeration condition adjusting strategy, along with decreasing temperature and influent substrate (anammonia). The SBBR operated steadily for 223 days at 35℃ and high substrate[(446.47±43.77) mg NH₄⁺-N/L] with the aeration regime of aeration/non-aeration=60min/60min; the total nitrogen removal rate (TNRR) and total nitrogen removal efficiency (TNRE) reached (0.49±0.07) kg N/(m³·d) and (84.3±4.6)%, respectively. After temperaute decreasd to 20~23℃, the intermittent aerobic condition was changed to aeration/non-aeration=40min/80min based on the ratio of NO₂^--N accumulation rate to NO₂^--N removal rate in the single-cycles. The TNRR and TNRE decreased to (0.43±0.04) kg N/(m³·d) and (69.5±5.7)% for 67days of operation, respectively. With gradual decreasing ammonia to (105.6±16.1) mg NH₄⁺-N/L, the aeration/non-aeration time was regulated to 40min/80min, 30min/90min and 8min/32min in sequence. For 67days operation, the TNRR decreased to (0.16±0.02) kg N/(m³·d); nevertheless, the TNRE increased to (71.5±7.5)%. High-throughput sequencing results confirmed that the regulation strategy applied herein ensured the dominance of nitrogen removal functional bacterias in CANON system during decreasing temperature and substrate while the relative abundance of nitrite oxidizing bacteira was always below 0.1%.

Key words： CANON biofilm reactor intermittent aerobic conditions temperature ammonium concentration high-throughput sequencing

Received: 04 December 2018

PACS:

X703.5

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	Articles by authors
	XIE Hong-chao
	WANG Xiao-dong
	WANG Wei-gang
	ZHANG Yao
	SHI Qin
	WANG Ya-yi

Cite this article:

XIE Hong-chao,WANG Xiao-dong,WANG Wei-gang等. Stable operation of CANON system during temperature and substrate decreasing process via aerobic regime adjustment[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 2781-2788.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I7/2781

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