Improvement of Alcaligenes sp.TB performance by Fe-Pd/multi-walled carbon nanotubes: Enriched denitrification pathways and accelerated electron transport. (May 2021)

• Record Type: Journal Article
• Authors: Wang, Zeyu; Dai, Luyao; Yao, Jiachao; Guo, Tianjiao; Hrynsphan, Dzmitry; Tatsiana, Savitskaya; Chen, Jun
• Is Part Of: Bioresource technology. Volume 327(2021)
• Publication Date: 2021-05
• Subjects: Fe-Pd/MWCNTs -- Denitrification -- Enzyme activity -- Electrochemical -- Electron transport; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.124785
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: The nanocomposites led the occur of short-cut denitrification. The generation of NO2 − -N and NH4 + -N by nanocomposites enriched NO3 − -N removal pathway. The nanocomposites induced electrons flow to metabolism and denitrification, respectively. The nanocomposites had significantly promotion on nitrite reductase activity. The electron exchange capacity of nanocomposites promoted electron transfer activity. Abstract: Aiming at the accumulation of NO2 − -N and N2 O during denitrification process, this work focused to improve the denitrification performance by Pd-Fe embedded multi-walled carbon nanotubes (MWCNTs). The main conclusions were as follows: 30 mg/L Pd-Fe/MWCNTs have shown an excellent promotion on denitrification (completely TN removal at 36 h). Meanwhile, enzyme activity results indicated that the generation of NO2 − -N, NH4 + -N by Pd-Fe/MWCNTs led the occur of short-cut denitrification by increasing 203.9% the nitrite reductase activity. Furthermore, electrochemical results and index correlation analysis confirmed that the electron exchange capacity (1.401 mmol eg −1 ) of Pd-Fe/MWCNTs was positively related to nitrite reductase activity, indicating its crucial role in electron transport activity (0.46 μg O2 /(protein·min) at 24 h) during denitrification process by Pd-Fe/MWCNTs played a role of chemical reductant and redox mediator.