Iron carriers promote biofilm formation and p-nitrophenol degradation. (April 2022)

• Record Type: Journal Article
• Authors: Cao, Lifeng; Zhu, Ge; Tao, Jinzhao; Zhang, Yongming
• Is Part Of: Chemosphere. Volume 293(2022)
• Publication Date: 2022-04
• Subjects: Biofilm -- p-nitrophenol (PNP) -- Biofilm carrier -- Iron and plastic -- Community biodiversity; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.133601
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Vertical baffled biofilm reactors (VBBR) equipped with Plastic-carriers and Fe-carriers were employed to explore the effect of biofilm carriers on biofilm formation and p -nitrophenol (PNP) degradation. The results showed that Fe-carriers enhanced biofilm formation and PNP degradation. The maximum thickness of biofilm grown on the Fe-carriers was 1.5-fold higher than that on the Plastic-carriers. The Fe-VBBR reached a maximum rate of PNP removal at 13.02 μM L −1 h −1 with less sodium acetate addition (3 mM), while the maximum rate of PNP removal was 11.53 μM L −1 h −1 with more sodium acetate addition (6 mM) in the Plastic-based VBBR. High-throughput sequencing suggested that the Fe-VBBR had a higher biodiversity of the bacterial community in evenness, and the Achromobacter genus and Xanthobacteraceae family were as main PNP degraders. Kyoto Encyclopedia of Genes and Genomes (KEGG) Orthology analysis suggested more abundances of iron uptake genes were expressed to transport iron into the cytoplasm under an iron-limited condition in two VBBRs, and the metabolic pathway of PNP degradation went through 4-nitrocatechol and 1, 2, 4-benzenetriol. Our results provide a new insight for iron enhancing biofilm formation and PNP degradation. Graphical abstract: Image 1 Highlights: Fe-carriers can promote biofilm formation and PNP degradation. More iron uptake genes were expressed under iron-limited conditions. Plastic-VBBR had a lower community diversity than Fe-VBBR. Achromobacter genus and Xanthobacteraceae family may be as PNP degraders.