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	Fast circulatory nitrification/denitrification process using continuous flow synchronous settling reactors promotes organic utilization efficiency in nitrogen removal
	Yin, Fengjun1,2; Wei, Haotian1; Yue, Xuehai1,2,3; Tan, Hao1,2,3; Yang, Xiaohui1; Lu, Shun1; Wang, Sha1,2; Zhao, Ying1; Liu, Hong1,2
	2024-06-01
摘要	Promoting organic utilization efficiency (OUE) in biological nitrogen removal has great potential for energy saving and consumption reduction. The theoretical COD/N (C/N) value for nitrogen removal is 2.86 in common nitrification/denitrification combinations. Recognizing this, a novel fast circulatory nitrification/denitrification (fCND) process was developed, which achieved an OUE of up to 90 % and minimized organic consumption without relying on unconventional microbial reactions. For the treatment of septic tank wastewater with a C/N ratio between 0.8 and 2.1, the C/N ratio of the additional carbon source was as low as 2.0, resulting in a total nitrogen removal efficiency of 89.7 +/- 2.4 % and indicating successful treatment that met the nitrogen discharge standard at a total C/N ratio of about 3.0. The maximum ammonium load rate reached 0.10 - 0.13 kg-N/m 3 /d. The mechanism for improving OUE is that the nitrification reactor acts as a NO 3 - -N reservoir to balance organic utilization in denitrification with proper nitrogen species exchange rate between different reactors. The C/N ratio and internal circulation rate (ICR) are two key parameters for this regulation. The realization of fast internal circulation depends on the newly designed continuous flow synchronous settling (CFSS) reactors, which ensure sludge -water separation at very low hydraulic retention time (HRT). Granular sludge is formed in the denitrification reactor, which helps enrich functional bacteria in each reactor. This fCND process offers a new approach for treating low C/N ratio wastewater, in addition to anammox-based processes, and possesses the advantages of simplicity, controllability and ease of instrumentation.
关键词	Fast internal circulation Nitrification/denitrification process Organic utilization efficiency Continuous flow synchronous settling reactor Sludge -water separation
DOI	10.1016/j.cej.2024.151242
发表期刊	CHEMICAL ENGINEERING JOURNAL
ISSN	1385-8947
卷号	489页码:10
通讯作者	Liu, Hong(liuhong@cigit.ac.cn)
收录类别	SCI
WOS记录号	WOS:001232318400002
语种	英语