Anaerobic digestion of microalgae has a real potential for feasible production of biogas. However, algae biomass production and the elimination of biogas production residual need considerable energy and nutrient utilization. By the application of algal-bacterial method hydrogen can be produced as an energy carrier, while the liquid phase of biogas sludge and the emitted carbon-dioxide can be recycled. This review focuses on the possible co-application and merging of biogas and biohydrogen production technologies for the further optimization of an environmentally friendly hybrid solution.