Biomass Production Potential of Chlorella vulgaris Under Different CO₂ Concentrations and Light Intensities
2011
Lee, C.M., Kangwon National University, Chuncheon, Republic of Korea | Kim, M.J., Kangwon National University, Chuncheon, Republic of Korea | Sanjay, Kumar, Kangwon National University, Chuncheon, Republic of Korea | Kwag, J.H., National Institute of Animal Science, RDA, Suwon, Republic of Korea | Ra, C.S., Kangwon National University, Chuncheon, Republic of Korea
The increasing demand of the crops (soybean and corn) for biofuel production has increased the focus of the animal nutritionists to look for alternative feeds, which are economic and environmental friendly. To identify microalgae as suitable candidate as an alternative feed, growth response of Chlorella vulgaris was studied under varying concentrations of carbon dioxide (0.07, 1.4, 3.0 and 5.0%) and photon densities (39.19, 72.97, 105.41, 116.22, 135.14, 175.68 μmol/㎡/s) by employing a photo-bioreactor. Swine wastewater was also investigated as nutritional source to economize the biomass production. Results showed that the higher biomass production was found to be at 3.0% CO₂ compared to other CO₂ concentrations. However, no difference in biomass production was found at 105.41 μmol/㎡/s and above photon densities with 12 h of photoperiodicity. It was observed that C. vulgaris could easily grow in 200 times diluted swine wastewater and growth was found to be similar with that of artificial medium. Provided the conducive conditions for optimal growth, it has also the potentiality of depleting ammonia nitrogen (NH₄-N) and orthophosphate (PO₄³--P) completely from the wastewater after 3~4 days of cultivation. Thus, growing C. vulgaris would not only solve the problem of animal feed, but also help in biological CO₂ mitigation and wastewater treatment.
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