The Effect of Light Wavelength on CO2 Capture, Biomass Production and Nutrient Uptake by Green Microalgae: A Step Forward on Process Integration and Optimisation

Abstract

Microalgae have drawn the attention of several researchers as an alternative to the traditional physicochemical CO2 capture methods, since they can convert CO2 and water into organic matter and release oxygen into the atmosphere. Microalgal growth can be improved by changing light supply, such as light intensity, wavelength, and photoperiod. In this study, the effect of different light wavelengths on CO2 capture, nutrient removal from a synthetic effluent and biomass production of Chlorella vulgaris, Tetradesmus obliquus and Neochloris oleoabundans was studied. The experiments were conducted with light-emitting diodes (LEDs) with different wavelengths: 380–750 nm (white), 620–750 nm (red) and 450–495 nm (blue). The maximum specific growth rate was obtained by N. oleoabundans with white LEDs (0.264 ± 0.005 d−1), whereas the maximum biomass productivity (14 ± 4 mgdw L−1 d−1) and CO2 fixation rate (11.4 mgCO2 L−1 d−1) were obtained by C. vulgaris (also with white LEDs). Nitrogen and phosphorus removal efficiencies obtained under white light conditions were also the highest for the three studied microalgae.

Phase transitions of multi-component fuel droplets under sub- and supercritical conditions

“…With the current energy system for the world economy, fossil fuels, such as hydrocarbons, are widely used [1]. The large amounts of emissions of greenhouse gases, such as CO2 [2][3][4] and nitrogen oxides [5],…”

Atmospheric CO2 Capture by Microalgae Culturing: A Critical Review

“…Such as, S. platensis, N. oleoabundans, Chlorella vulgaris, S.almeriensis, Scenedesmus dimorphus, Scenedesmus obliquus, Gleocystis ampula etc. [39,35,40,41]. The productions are promoted mainly different agents like alkali compound (bicarbonate, sulfonate), light intensity, wavelength, photoperiod etc.…”

The effect of variable operating parameters for hydrocarbon fuel formation from CO2 by molten salts electrolysis

“…With increasing world population and living standards, the consumption of energy sources (fossil fuels) internationally and domestically has been increased that resulted in high levels of CO2 in the atmosphere and leading to environmental and climate destructions. The higher concentration of CO2 is not only causing the greenhouse effect but also affecting global warming, melting the polar ice, and increasing atmospheric temperature [1,2]. Therefore, the strategies should be adopted to reduce and convert CO2 directly from emission sources or atmosphere into hydrocarbon fuels by utilizing renewable energy sources including hydroelectric, geothermal, solar, and wind [3,4].…”