| Summary: | 碩士 === 逢甲大學 === 環境工程與科學學系 === 104 === Every country should pay great attention to global warming caused by CO2, and treat carbon emission reduction as a primary concern. Algae photosynthesis during algae growth can aid in carbon reduction. High lipid content algae can also be used as feedstock for biodiesel.
Algae can be grown in autotrophic medium (3N-BBM+V) or heterotrophic Proteose medium. The generation time for Neochloris aquatica and Golenkinia longispicula in Proteose medium was 2.48±0.28 d and 2.69±0.18 d, respectively. This revealed that these two freshwater algae are mixotrophic algae. The lipid productivity of N. aquatica and G. longispicula in the autotrophic medium was 78.84±10.17 mg/l/d and 97.13±13.08 mg/l/d, respectively. Their productivity in heterotrophic medium was 66.90±7.1 mg/l/d and 147.33±14.67 mg/l/d, respectively. This revealed that these two algae accumulated lipids in their cells under both autotrophic and heterotrophic environments.
N. aquatica and G. longispicula may grow and accumulate lipids in effluent dairy cattle wastewater containing low NH4+-N. The lipid productivity was 89.54±37.97 mg/l/d and 131.13±52.23 mg/l/d, respectively. The lipid productivity of N. aquatica and G. longispicula in dairy cattle wastewater was similar to that in Proteose medium, indicating that the algae medium can be replaced with dairy cattle wastewater. After N. aquatica and G. longispicula were cultivated in the wastewater, over 90 % of the PO43--P and NO3--N in the wastewater was removed.
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