Nitrogen metabolism in photosynthetic bacteria wastewater treatment: A novel nitrogen transformation pathway. (December 2019)

• Record Type: Journal Article
• Authors: Yang, Anqi; Zhang, Guangming; Meng, Fan; Zhi, Ran; Zhang, Panyue; Zhu, Yichun
• Is Part Of: Bioresource technology. Volume 294(2019)
• Publication Date: 2019-12
• Subjects: Nitrogen removal -- Photosynthetic bacteria -- Transformation pathway -- Nitrogen metabolism; 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.2019.122162
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: PSB can efficiently utilize NH4 + -N, NO3 -N and NO2 -N to grow with no preference. Over 90% nitrogen removal efficiencies were obtained under suitable condition. 35 ~ 51% of removed nitrogen was transformed to gaseous nitrogen. Basically no mutual transformation occurred between NH4 + -N, NO2 -N and NO3 -N. Key functional genes for NH4 + -N oxidation could not be amplified in PSB. Abstract: Nitrogen removal from wastewater is a worldwide environmental problem. Photosynthetic bacteria (PSB) were reported to have a great potential in treating varieties of nitrogen-contaminated wastewater. However, their nitrogen metabolic mechanism is still unclear, which was further explored in this work. The results showed that PSB can efficiently utilize NH4 + -N, NO3 − -N and NO2 − -N. Over 90% nitrogen removal efficiencies were obtained under suitable condition. 35 ~ 51% of removed nitrogen was transformed to N2 and N2 O. In addition, basically no mutual transformation occurred between NH4 + -N, NO3 − -N and NO2 − -N in PSB, which is different from other biological technologies. Combining with the analysis of functional gene groups, it indicated that there might be a new direct nitrogen transformation pathway, i.e. NH4 + might be directly oxidized to N2 /N2 O in nitrogen metabolism of PSB, which breaks the limitations of existing technologies, and proposed a new understanding of nitrogen metabolism in PSB.