生物膜强化推流式颗粒污泥自养脱氮反应器启动

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Abstract In this study, a novel start-up strategy for single-stage partial nitritation-anammox (SPNA) process was developed in a plug-flow granular sludge reactor. The activated sludge inoculum and biofilm-fixing carriers were simultaneously added into reactor firstly to start up as integrated fixed-film activated sludge (IFAS) process with ammonium input. Under low dissolved oxygen (DO) concentration of <0.2mg/L, the influent ammonium concentration and aeration rate gradually increased until the autotrophic nitrogen removal system performance was stable and a total inorganic nitrogen removal rate around 1.7kgN/(m³·d) was achieved. As the biofilm was formed, matured, and detached repeatedly during the start-up period, red-brown granules were observed in mixed suspended sludge liquid. Then the media filling ratio was adjusted from 20% to 0%, resulting in a temporary decrease of granular size from 270μm to 163μm and total inorganic nitrogen removal rate to 0.85kgN/(m³·d). However, the removal performance was rapidly recovered following the increment of aeration and the average sludge particle size gradually increased by 195μm.The experimental results showed that flocs and particles could be stable co-existed in the SPNA reactor, and the final loading rate of 1.5kgN/(m³·d) could be achieved, which was comparable to that in IFAS mode. Therefore, the start-up method reported could be an effective pathway to fulfill high-rate autotrophic nitrogen removal in plug-flow granular sludge systems.

Key words： SPNA plug-flow granular sludge IFAS

Received: 28 October 2020

PACS:

X703.1

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	Articles by authors
	SONG Pei-yuan
	ZHANG Liang
	YANG Shen-hua
	LI Zhao-yang
	PENG Yong-zhen

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SONG Pei-yuan,ZHANG Liang,YANG Shen-hua等. Start-up of biofilm enhanced granular sludge process for autotrophic nitrogen removal in a plug-flow reactor[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2595-2601.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I6/2595

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