Journal
BIORESOURCE TECHNOLOGY
Volume 343, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126116
Keywords
Heterotrophic nitrification- aerobic denitrification; NADH/NAD(+) ratio; ETSA; ATP content; Enzyme activity
Funding
- National Natural Science Foundation of China [:51778057, 51808045]
- National Training Programs of Innovation and Entrepreneurship for Undergraduates [202110710071]
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The study found that increasing the C/N ratio can enhance the HNAD performance of Acinetobacter junii ZHG-1, but the effect diminishes when the C/N ratio exceeds 30. Therefore, more research efforts should focus on the influence mechanism of different environmental factors on the HNAD process.
A heterotrophic nitrification- aerobic denitrification (HNAD) bacterium, Acinetobacter junii ZHG-1, was isolated, meanwhile, the optimal conditions for the strain were evaluated, moreover, the influence mechanism of the C/N ratio on the HNAD process was investigated from the perspective of electron transport and energy level. The increasing of C/N ratio enhanced the reduced/oxidized nicotinamide adenine dinucleotide (NADH/NAD(+)) ratio, NADH concentration, electron transport system activity (ETSA), ATP content, as well as enzymes activities, consequently, the HNAD performance of the strain can be improved, however, when the C/N ratio was higher than 30, the activities of enzymes relating to the HNAD process and the ETSA had reached the maximum, which might limit the further improvement of the nitrogen removal with the increasing of C/N ratio. As the interaction between different biochemical reactions in HNAD process, more efforts should be devoted to the influent mechanism of different environmental factors on the HNAD process.
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