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High efficiency of simultaneous nitrification, denitrification, and organics removal in the real-scale treatment of high C/N ratio food-processing wastewater using micro-aerobic reactors

Authors
Cheng, YuLi, Jiao-YangRen, XianghaoLi, YingKou, Ying-YingChon, KangminHwang, Moon-HyunKo, Myung-Han
Issue Date
Jan-2022
Publisher
ELSEVIER
Keywords
Micro-aerobic reactor; Simultaneous nitrification and denitrification; Organic matter; Food-processing wastewater
Citation
BIOCHEMICAL ENGINEERING JOURNAL, v.177
Indexed
SCIE
SCOPUS
Journal Title
BIOCHEMICAL ENGINEERING JOURNAL
Volume
177
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/141998
DOI
10.1016/j.bej.2021.108218
ISSN
1369-703X
1873-295X
Abstract
Micro-aerobic reactors (MARs) play an important role in simultaneous nitrification, denitrification, and organics removal but are affected by the C/N ratio. In this study, high C/N ratio food-processing wastewater was treated using two-step MARs. The average removal efficiencies of total nitrogen and chemical oxygen demand during the MAR process were 84.21% and 95.43%, respectively. The efficiency of simultaneous nitrification and denitrification was 88.87% and 17.26% in MAR-1 and MAR-2, respectively; simultaneously, organic matter was efficiently degraded. Protein-like materials were biodegraded preferentially, and the degree of change in fulvic-like substances was the greatest during the MAR processes. This was attributed to the spatial distribution of the dissolved oxygen concentration in a single MAR, which may influence the microbial community composition (e. g., that of Nitrospira) and the regulation of gene functions.
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