Ammonium-assimilating microbiome: A halophilic biosystem rationally optimized by carbon to nitrogen ratios with stable nitrogen conversion and microbial structure. (April 2022)

• Record Type: Journal Article
• Authors: Zhang, Mengru; Han, Fei; Liu, Zhe; Han, Yufei; Li, Yuke; Zhou, Weizhi
• Is Part Of: Bioresource technology. Volume 350(2022)
• Publication Date: 2022-04
• Subjects: Ammonium assimilation -- C/N ratios -- Saline wastewater treatment -- Bacterial community -- Ammonium-assimilating biosystems; 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.2022.126911
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: C/N ratios do not change nitrogen conversions in ammonium-assimilating biosystems. COD, nitrogen and phosphorus are removed simultaneously at different C/N ratios. C/N ratios do not significantly change structure of heterotrophic communities. Abstract: The contradiction between theoretical metabolism of ammonium assimilation and experiential understanding of conventional biosystems makes the rational optimization of the ammonium-assimilating microbiome through carbon to nitrogen (C/N) ratios perplexing. The effect of different C/N ratios on ammonium-assimilating biosystems was investigated in saline wastewater treatment. C/N ratios significantly hindered the nutrient removal efficiency, but ammonium-assimilating biosystems maintained functional stability in nitrogen conversions and microbial communities. With sufficient biomass, higher than 86% ammonium and 73% phosphorus were removed when C/N ratios were higher than 25. Ammonium assimilation dominated the nitrogen metabolism in all biosystems even under relatively low C/N ratios, evidenced by the extremely low abundances of nitrification functional genes. Different C/N ratios did not significantly change the bacterial community structure of ammonium-assimilating biosystems. It is anticipated that the ammonium-assimilating biosystem with advantages of clear metabolic pathway and easy optimization can be applied to nutrient removal and recovery in saline environments.