Utilization of recovered nitrogen from hydrothermal carbonization process by Arthrospira platensis. (July 2016)

• Record Type: Journal Article
• Authors: Yao, Changhong; Pan, Yanfei; Lu, Hongbin; Wu, Peichun; Meng, Yingying; Cao, Xupeng; Xue, Song
• Is Part Of: Bioresource technology. Volume 212(2016)
• Page Start: 26
• Page End: 34
• Publication Date: 2016-07
• Subjects: Nitrogen recycling -- Hydrothermal carbonization -- Microalgae cultivation -- Nitrogen limitation -- Carbohydrate -- Arthrospira platensis; 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.2016.03.166
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Hydrothermal carbonization aqueous phase (HTCAP) for Arthrospira platensis culture. Organic nitrogen (N) dominated the total N in HTCAP. N-limited cultivation mode must be taken for successful N recycling from HTCAP. Carbohydrate production was enhanced using HTCAP as N source in lab and pilot test. 54% of organic N in HTCAP was utilized by pre-N starved algae under N limitation. Abstract: In the context of sustainable cultivation of microalgae, the present study focused on the use of nitrogen from the hot-water extracted biomass residue of Arthrospira platensis by hydrothermal carbonization (HTC) and the sequential cultivation of the same alga with the HTC aqueous phase (AP). Nearly 90% of the nitrogen recovered from HTC into AP was in the organic form. Under nitrogen-limited condition with HTCAP as nitrogen source the yield and content of carbohydrate were enhanced by 21% and 15% respectively compared with that under the same nitrogen level provided by NaNO3, which entitled HTCAP for the substitution of conventional nitrate. In the same way pilot-scale cultivation of A. platensis in raceway ponds outdoors demonstrated that carbohydrate content of 43.8% DW and productivity of 10.3 g/m 2 /d was achieved. Notably 54% of organic nitrogen in the HTCAP could be recycled by cultivation of pre-nitrogen starved A. platensis as seeds under nitrogen limitation.