Evaluation of the integrated hydrothermal carbonization-algal cultivation process for enhanced nitrogen utilization in Arthrospira platensis production

•Integration of HTC-algal cultivation for N recycle.•N recovery by microalgae depended on HTC conditions and cultivation modes.•Biomass yield and quality could be enhanced by cultivating A. platensis with HTCAP.•Cultivation of A. platensis with HTCAP under −N mode saved 60% of conventional N. Sustai...

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Published in:Bioresource technology 2016-09, Vol.216, p.381-390
Main Authors: Yao, Changhong, Wu, Peichun, Pan, Yanfei, Lu, Hongbin, Chi, Lei, Meng, Yingying, Cao, Xupeng, Xue, Song, Yang, Xiaoyi
Format: Article
Language:English
Subjects:
Arthrospira platensis
Bacteriological Techniques
Biomass
Biomass quality
Biotechnology - methods
Carbohydrate Metabolism
Carbon - chemistry
Carbon - metabolism
Hydrothermal carbonization
Microalgae - metabolism
Microalgal cultivation
Nitrogen - metabolism
Nitrogen recycling
Recycling
Spirulina - growth & development
Spirulina - metabolism
Temperature
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Summary:•Integration of HTC-algal cultivation for N recycle.•N recovery by microalgae depended on HTC conditions and cultivation modes.•Biomass yield and quality could be enhanced by cultivating A. platensis with HTCAP.•Cultivation of A. platensis with HTCAP under −N mode saved 60% of conventional N. Sustainable microalgal cultivation at commercial scale requires nitrogen recycling. This study applied hydrothermal carbonization to recover N of hot-water extracted Arthrospira platensis biomass residue into aqueous phase (AP) under different operation conditions and evaluated the N utilization, biomass yield and quality of A. platensis cultures using AP as the sole N source. With the increase of temperature at 190–210°C or reaction time of 2–3h, the N recovery rate decreased under nitrogen-repletion (+N) cultivation, while contrarily increased under nitrogen-limitation (−N) cultivation. Under +N biomass accumulation in the cultures with AP under 190°C was enhanced by 41–67% compared with that in NaNO3, and the highest protein content of 51.5%DW achieved under 200°C-2h was also 22% higher. Carbohydrate content of 71.4%DW under −N cultivation achieved under 210°C-3h was 14% higher than that in NaNO3. HTC-algal cultivation strategy under −N mode could save 60% of conventional N.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.05.110