PN/A工艺在热水解污泥消化液处理工程中的应用研究

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Abstract The partial nitrification-anaerobic ammonium oxidation (PN/A) process was successfully launched in a sewage treatment plant in Beijing for the treatment of sludge-digestion liquid treatment by thermal hydrolysis. The optimal operation conditions were proposed based on the project commissioning. Specifically, the PN/A system could be quickly initiated when the proportion of biofilm-inoculated carrier was 18% of the total carrier and the relative abundance of anaerobic ammonium oxidation bacteria (AnAOB) on the biofilm reached 6.8%. The designed water treatment capacity could be achieved within 3months, where the total nitrogen removal load was 0.26kg/(m³·d) and the total nitrogen removal efficiency reached 80%. Quantitative PCR and high-throughput sequencing analysis showed that different spatial distribution characteristics of AOB and AnAOB abundance, and proportions of both ammonia oxidizing bacteria (AOB) and AnAOB increased steadily during the commissioning; and the respective abundance of AOB in flocs and AnAOB on the biofilm reached the magnitude of 10¹¹ and 10¹² after 3 months of cultivation. Data from practical operation demonstrated that the sidestream treatment system has a positive impact on the mainstream, where a 2.9 mg/L decrease of the total nitrogen was observed with the influent for a sewage treatment plant of 40×10⁴t/d. At the last running stage of the project, an insufficient supply of free ammonia (FA) was observed in the anoxic zone of the reaction tank, which resulted in the unstable performance of the PN/A system. However, the system could be quickly restored by controlling the FA concentration at the beginning and end of the reaction tank and the remaining ammonia nitrogen concentration.

Key words： sewage treatment anammox nitrogen removal sludge-digestion liquid

Received: 13 November 2023

PACS:

X703.1

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	WANG Xiao-cong
	HAN Xiao-yu
	ZHANG Shu-jun
	LI Wei
	HUANG Jing
	JIAO Jia-tong
	WANG Qian
	WANG Zhi-min
	QU Zhi-ming

Cite this article:

WANG Xiao-cong,HAN Xiao-yu,ZHANG Shu-jun等. Research on the application of the PN/A process in projects of sludge-digestion liquid treatment by thermal hydrolysis[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(7): 3698-3706.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I7/3698

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