Carbon dioxide fixation coupled with ammonium uptake by immobilized Scenedesmus obliquus and its potential for protein production. (October 2019)

• Record Type: Journal Article
• Authors: Liu, Xiang; Wang, Kaijun; Wang, Jingyao; Zuo, Jiane; Peng, Fei; Wu, Jing; San, Erfu
• Is Part Of: Bioresource technology. Volume 289(2019)
• Publication Date: 2019-10
• Subjects: Carbon dioxide fixation -- Ammonium -- Scenedesmus obliquus -- Immobilization -- Photoautotrophy; 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.2019.121685
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: The microalgae were immobilized for NH4 + -N removal compared to free form. Autotrophic and mixotrophic conditions were simultaneously analyzed. CO2 level was a key factor for NH4 + -N removal and optimal level was selected. Protein was the main product of NH4 + -N bioconversion in microalgae-based system. Abstract: In this study, immobilized Scenedesmus obliquus ( S. obliquus ) was proposed to simultaneously alleviate the carbon dioxide (CO2 ) and ammonium (NH4 + -N). Two trophic modes of autotrophy and mixotrophy were conducted by batch experiments with a period of 5 days. The results shown that NH4 + -N could be removed more efficiently if algal cells were immobilized, and the trophic mode change had no significant effect on immobilized S. obliquus to NH4 + -N removal under 5% CO2 sparging. Specifically, immobilized S. obliquus could remove NH4 + -N completely at initial concentrations of 30 and 50 mg/L and reached about 80% removal rate of NH4 + -N at the concentration of 70 mg/L under both trophic modes. The protein synthesis was its main removal mechanism and the dominant amino acid components including glutamic acid (Glu), cystine (Cys), arginine (Arg), methionine (Met) and lysine (Lys) were sensitive to NH4 + -N assimilation.