期刊
BIORESOURCE TECHNOLOGY
卷 260, 期 -, 页码 68-75出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.02.080
关键词
Haematococcus pluvialis; Bacillus subtilis; Engineered algae-bacteria co-culture; Astaxanthin; Organic waste treatment
资金
- PNNL Technology Investment Program
- Genomic Science Program, Office of Biological and Environmental Research (BER), U.S. Department of Energy (DOE) through the Biofuels and Foundational Scientific Focus Areas
- DOE [DE-AC05-76RLO 1830]
Growth of heterotrophic bacterium Bacillus subtilis was metabolically coupled with the photosynthetic activity of an astaxanthin-producing alga Haematococcus pluvialis for conversion of starch-containing waste stream into carotenoid-enriched biomass. The H. pluvialis accounted for 63% of the produced co-culture biomass of 2.2 g/L. Importantly, the binary system requires neither exogenous supply of gaseous substrates nor application of energy-intensive mass transfer technologies due to in-situ exchange in CO2 and O-2. The maximum reduction in COD, total nitrogen and phosphorus reached 65%, 55% and 30%, respectively. Conducted techno-economic assessment suggested that the astaxanthin-rich biomass may potentially offset the costs of waste treatment, and, with specific productivity enhancements (induction of astaxanthin to 2% and increase H. pluvialis fraction to 80%), provide and additional revenue stream. The outcome of this study demonstrates a successful proof-of-principle for conversion of waste carbon and nutrients into value-added products through metabolic coupling of heterotrophic and phototrophic metabolisms.
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