Figure 2. .

Overview of the combined process for production of hydrogen and bioactive metabolites. Green microalgae can be cultured under optimal growth conditions, followed by exposure to stress conditions (high light intensity, nutrient deprivation). The algal biomass can be harvested and used for different purposes, for example direct use as food supplement, aquaculture and animal fodders. Several valuable components can be extracted for the purpose of pharmaceutical industry, cosmetics or other types of industrial purposes.