Abstract
Previous studies showed that cooking cocoon wastewater (CCW) could be used as a medium alternative directly to cultivate Chlorella sorokiniana (FACHB-275) in a bubble-column bioreactor. In order to further improve culture conditions and enhance algal biomass production, impacts of light intensity and photoperiod on biomass concentration, nutrient removal, and chemical compositions of C. sorokiniana were investigated in this work when this alga grew on CCW in the bioreactor. Results showed that the maximum values of algal biomass concentration and productivity of 3.96 g/L and 516.1 mg/L/d, respectively, were achieved when C. sorokiniana was cultivated in the bioreactor for 7 days under a light intensity of 150 μmol/m2/s and photoperiod of 16L:8D. And the optimal light intensity and photoperiod for biomass production were 104.3 μmol/m2/s and 15.3L:8.7D, respectively, which were anaylzed by a quadratic model. Correspondingly, removal efficiencies of ammonium, total nitrogen, total phosphorus, and chemical oxygen demand were 93.12, 80.79, 93.08, and 69.08%, respectively. In addition, chemical compositions in this alga varied with the changes of light conditions (i.e., light intensity and photoperiod), suggesting that a desirable chemical composition could be obtained by regulating the light conditions. These results would be helpful to large-scale cultivation of this alga in CCW using photobioreactors.
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