Journal
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
Volume 60, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.algal.2021.102517
Keywords
Cyanobacterium; Waste management; Biorefinery; Nutrient recovery; Wastewater treatment; Biomass production
Categories
Funding
- EU H2020 Research and Innovation Framework Programme [727874]
- Spanish Ministry of Education [FPU16/05996]
- Spanish Ministry of Science, Innovation, and Universities [IJC2018-035287-I]
- BBVA Foundation [IN[20]_IN_ING_0051]
- H2020 Societal Challenges Programme [727874] Funding Source: H2020 Societal Challenges Programme
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The study demonstrated the potential of using nutrients from waste streams to produce cyanobacteria through indoor trials and outdoor upscaled experiments. The biomass productivity was comparable to that of the standard medium, with high nitrogen and phosphorus removal efficiency achieved outdoors. Further studies are needed to assess the large-scale production potential of these strains.
Indoor trials using 0.3 L bubble columns were conducted to demonstrate the potential of two cyanobacterial strains, Anabaena sp. and Dolichospermum sp., for being produced using nutrients obtained from waste streams (wastewater or pig slurry). Filtered pig slurry diluted at a concentration of 5% (v/v) led to a biomass productivity comparable to that of the standard medium (0.72 +/- 0.05 and 0.66 +/- 0.09 g.L-1.day(-1) for Anabaena sp. and Dolichospermum sp. respectively). When produced using wastewater, the productivity was around 0.40 g.L-1.day(-1) for both strains. The process was up-scaled using a 1.04 m(3) raceway reactor located outdoors and operated at a culture depth of 0.12 m. Dilution rates of 0.1-0.3 day(-1) were evaluated, achieving maximum biomass productivities when operating at a dilution rate of 0.3 day(-1): 20.9 and 28.0 g.m(-2).day(-1) for Anabaena sp. and Dolichospermum sp., respectively. The maximum total nitrogen (N-NH4+ plus N-NO3-) removal rates for Anabaena sp. and Dolichospermum sp. were 2471 and 3621 mg.m(-2).day(-1), achieved when operating at a dilution rate of 0.3 day(-1). Nitrification and stripping contributed to the N-NH4+ removal. When operating at 0.3 day(-1), maximum P-PO43- removal rates for cultures of Anabaena sp. and Dolichospermum sp. were 81.5 and 87.1 mg.m(-2).day(-1). Illumina sequencing results revealed that both strains dominated the prokaryotic community of both cultures with other notable eukaryotic and prokaryotic genus detected including human pathogens. However, annual studies are needed to assess the potential of producing biomass rich in these strains at largescale outdoors.
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