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- W2401165744 abstract "Microalgae flue gas mitigation is an attractive strategy to reduce greenhouse gases. To enhance economic feasibility and sustainability, the gas is being contemplated as a source of nutrients for byproduct generation. As an unexploited resource, all gas components should be considered to assess its potential. In this study, a cultivation strategy for a CO2-tolerant isolate, Desmodesmus abundans RSM, was implemented in a 3-L customized photobioreactor under continuous light (190 μmol PAR-photons m− 2 s− 1) considering cement kiln dust (CKD) and major gases at concentrations close to maximums (25% CO2, 800 ppm NO, 200 ppm SO2). Two gas supply schemes were tested (continuous and 24 h aeration cycles of flue gas followed by 24 h no flue gas) in complete (BG11) and incomplete (BG11-N-S) medium using CKD to control pH > 5.0. Continuous aeration inhibited growth after 60 h. At low pH, uninterrupted changes in culture pH might compromise the ability of microalgae to adapt. Conversely, 24 h aeration cycles with CKD allowed microalgae growth in BG11 and BG11-N-S (0.227 ± 0.012 and 0.164 ± 0.009 gd.w. L− 1 d− 1, respectively). Growth parameters were significantly higher during flue gas aeration in BG11, compared to BG11-N-S and a CO2 control. Maximum specific growth rate was reduced by 17% in BG11-N-S, while biomass depended parameters showed reductions around 28%. Biomass protein content also decreased from 28.5 to 22.7% w/w in BG11 and BG11-N-S, respectively. Compare to BG11, BG11-N-S showed less SOx and NOx in solution that evidence oxidation to sulfate and nitrite, respectively, and assimilation as a nutrient resource. CKD incorporated low concentrations of Pb and As, below regulatory limits, and without an adverse effect on growth. Further studies with real flue gas are needed for biomass valorization and large-scale implementation of the cultivation strategy, where the gas and particulates serve as a nutrient resource." @default.
- W2401165744 created "2016-06-24" @default.
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- W2401165744 date "2016-07-01" @default.
- W2401165744 modified "2023-10-04" @default.
- W2401165744 title "Cement flue gas as a potential source of nutrients during CO 2 mitigation by microalgae" @default.
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- W2401165744 doi "https://doi.org/10.1016/j.algal.2016.05.017" @default.
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