Effects of light intensity on growth of native microalgal cellular components and performance of biodiesel
To investigate the effects of light intensity on the growth,photosynthetic activity and intracellular/extracellular components of native microalgae from wastewater,this paper comparatively investigated the effects of different light intensities(i.e.groups with low light intensity of 54 μmol/(m2·s)and high light intensity of 1000 μmol/(m2·s))on the growth and photosynthetic activity of native microalgae by measuring the variations on cell numbers,pH,chlorophyll content and photosynthetic parameters(Fv/Fm,rETR),as well as the response characteristics of native microalgal intracellular and extracellular components such as extracellular polymeric substances,intracellular proteins,polysaccharides and fatty acid content.The results demonstrated that compared with the low light intensity group,the biomass was reduced by 47.63% under high light intensity and the pH increased rapidly from 6.60 to 11.36.The chlorophyll concentration was only 1.66 mg/L and the photosynthetic activity of native microalgae was remarkably decreased,which might contribute to the inhibited growth of microalgae.Under the high light intensity,the intracellular protein and polysaccharide content decreased by 29.19% and 16.23% respectively,while the extracellular polymer content significantly increased by 58.14% .Moreover,the fatty acid content increased(440.548 mg/L)with variations on the composition ratio,and the high light intensity group also presented better oxidative stability,hydrophilicity,combustion performance and high temperature protection performance,in spite of the slightly low temperature fluidity and energy.
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