Abstract
An experimental procedure was carried out to maximize Chaetoceros gracilis growth. Chaetoceros gracilis , marine microalgae, is considered for feeding fisheries with no GMO (Genetically Modified Organisms) to avoid human health hazards. Furthermore, following United Nations Resolution on water, the microalgae is grown in photobioreactors due to its low water usage. To maximize the microalgae growth, an experimental design was carried out to analyze the effects of Light Intensity, CO 2 supply per day, Sparger type, Photoperiod and Inlet airflow, pH and water temperature were monitored but not controlled. It was found that Light intensity and CO 2 supply per day have statistical significance. Out of three possible scenarios, 1700 lux and 80 gr/day of CO 2 , leads to a cell density at day three of 310×10 4 cel/mL which represents 20% more of the density attained in day two under bag (standard) growing conditions. It was also found that water Ph has also a strong effect over cell density.
Highlights
Food security is one of United Nations Sustainable Development Goals, SDG, (United Nations, 2012), Food security assessment still shows a big difference across regions and this confirms that efforts are required to enable access to underserved communities (FAO, 2016)
Screening experiment: The first stage consisted on a screening experiment with 5 factors and two response variables: cell density and pH
The Analysis of Variance (ANOVA) analysis confirmed this, to better understand potential relationships, a matrix of Pearson correlation coefficients between cell density and pH was built leading to Table 3
Summary
Food security is one of United Nations Sustainable Development Goals, SDG, (United Nations, 2012), Food security assessment still shows a big difference across regions and this confirms that efforts are required to enable access to underserved communities (FAO, 2016). Microalgae are prokaryotic or eukaryotic photosynthetic microorganisms, that despite severe conditions, they can grow rapidly, mainly because of their unicellular or simple multicellular structure (Mata et al, 2010). They can be found in any existing earth ecosystems, aquatic and terrestrial as well. Mixing is necessary to prevent cell sedimentation and clustering, as well as thermal stratification. It is required for nutrients distribution in addition to break down diffusion gradients at the cell surface, to remove generated oxygen and to guarantee that cells experience light/dark alternating periods (Richmond, 2000).
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