The only bio-H_2 production leads to a negative net energy balance, hence in this paper experimental tests in order to increase the energy recovery embedded in the substrate have been carried out. In order to try different strategies to recovery as much as possible the energy, we have realized several proofs of the concept tests on the following different approaches: i) Production of biogas on liquid metabolites; ii) Production of H_2 from sodium acetate by Microbial Electrolysis Cell (MEC) with cation exchange membrane (CEM). Both technologies demonstrate to be feasible and with the double positive effect: the energy recovery increment and the greater lowering of the organic wastewater load.
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