The effects of fulvic acid on microbial denitrification: promotion of NADH generation, electron transfer, and consumption

Applied Microbiology and Biotechnology
Mu LiKun Liu

Abstract

The heterotrophic denitrification requires the participation of electrons which are derived from direct electron donor (usually nicotinamide adenine dinucleotide (NADH)), and the electrons are transferred via electron transport system in denitrifiers and then consumed by denitrifying enzymes. Despite the reported electron transfer ability of humic substances (HS), the influences of fulvic acid (FA), an ubiquitous major component of HS, on promoting NADH generation, electron transfer, and consumption in denitrification process have never been reported. The presence of FA, compared with the control, was found not only significantly improved the total nitrogen (TN) removal efficiency (99.9 % versus 74.8 %) but remarkably reduced the nitrite accumulation (0.2 against 43.8 mg/L) and N2O emission (0.003 against 0.240 mg nitrogen/mg TN removed). The mechanisms study showed that FA increased the metabolism of carbon source via glycolysis and tricarboxylic acid (TCA) cycle pathways to produce more available NADH. FA also facilitated the electron transfer activities from NADH to denitrifying enzymes via complex I and complex III in electron transport system, which improved the reduction of nitrate and accelerated the transformations of n...Continue Reading

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Citations

Mar 12, 2020·Environmental Science and Pollution Research International·Xiaoxuan SuQiang He
Jan 25, 2020·Journal of Hazardous Materials·Chao WangTengfei Li
May 16, 2021·Bioresource Technology·Yuqi LiuLin Xiao
Dec 17, 2021·The Science of the Total Environment·Ying ZhangJianbo Guo

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