Utilization of recovered nitrogen from hydrothermal carbonization process by Arthrospira platensis

•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...

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Bibliographic Details
Published in:Bioresource technology 2016-07, Vol.212, p.26-34
Main Authors: Yao, Changhong, Pan, Yanfei, Lu, Hongbin, Wu, Peichun, Meng, Yingying, Cao, Xupeng, Xue, Song
Format: Article
Language:English
Subjects:
Arthrospira platensis
Biomass
Carbohydrate
Carbon - metabolism
Hydrothermal carbonization
Microalgae - growth & development
Microalgae - metabolism
Microalgae cultivation
Nitrates - metabolism
Nitrogen - chemistry
Nitrogen - metabolism
Nitrogen limitation
Nitrogen recycling
Spirulina - growth & development
Spirulina - metabolism
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Summary:•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. 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 10.3g/m2/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.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.03.166