Land-based Cultivation of Ulva prolifera by Applying CO2 of Biogas

LEE Chang Yuan, MIYASHITA Kohichi, KAMAHARA Hirotsugu, ATSUTA Yoichi, DAIMON Hiroyuki

doi:10.11353/sesj.30.11

Biogas produced by anaerobic digestion contains 60％ of methane (CH₄) and 40％ of carbon dioxide (CO₂) generally. The CH₄ could be used for power generation, but not many studies have been reported on the utilization of CO₂ separated from biogas. In this study, the CO₂ was dissolved into water, and utilized on the cultivation of Ulva prolifera, as an attempt to increase the production yield. The initial conditions for the cultivation of Ulva prolifera, including CO₂ concentration, were determined using bench-scale cultivation (500 mL). Pilot-scale cultivation (100 L and 1000 L) were then performed using land-based cultivation method and its feasibility under commercialized scale was evaluated. Results showed that the addition of CO₂ into the cultivation of Ulva prolifera under pilot-scale improved the production yield by almost 2 times when compared to the cultivation without addition of CO₂. The evaluation of feasibility indicated that currently the running cost was high and in case of land-based cultivation the cost of sea water would be a major concern. Although further evaluation showed that the overall cost could be reduced when the sea water is recycled, further investigations are necessary. All in all this study showed that the CO₂ separated from biogas could be utilized in algae cultivation, which would lead to increase of the production yield.

Land-based Cultivation of <i>Ulva prolifera</i> by Applying CO<sub>2</sub> of Biogas

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