A study on the cultivation and harvest process of Chlorella by foam flotation:Whey soy protein as nitrogen source and bio-surfactant
Microalgae,the third generation biomass raw material,has been used to produce biodiesel for its advantages of high production capacity and high lipids content.In order to increase the production and separation efficiency of microalgae,foam flotation can be applied in the harvest of microalgae.Protein as a natural nitrogen source and a bio-surfactant can play a role of a bridge in coupling the cultivation process with the separation process.The application of the recovered whey soy protein from the soy whey wastewater is cost-effective to the production of Chlorella.The addition of whey soy protein was beneficial to the growth of Chlorella in BBM.In foam flotation,a high enrichment ration 18.7 and a high recovery percentage 96.4%of Chlorella were obtained by adding the optimal whey soy protein concentration of 0.163 g/L at pH 7.0.
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