Innovative Nano-biotechnology for Hydrogen and Methane Co-Production with Zero CO2 Emission through a Novel Design of Three-Stage Continuous Flow Anaerobic Digestion System

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Biochemical methane potential (BMP) tests have been conducted to optimize the conditions of biogas and methane production and applied to a semi-continuous operation system.The results showed that Under the optimum conditions, the methane production increased by 46.6% in the batch tests and 120% in the semicontinuous operation system compared to the control reactor. The improved methane production originated from the synergetic effect of combining Fe0 and Mg(OH)2. The crucial role of the Mg(OH)2 coating layer was associated with the controlled reactivity release of Fe0, which was indicated by the slow release of Fe2+ and Fe3+ in the bioreactors. Furthermore, the addition of coated/Fe0 stimulated bacterial growth increased methane content and maintained the pH within the optimum range in the bioreactors. The dosing time of coated/Fe0 was investigated during the four stages of the anaerobic digestion process, and the best dosing time was found in the methanogenic stage (on Day 4). Overall, based on the experimental and predicted methane production, the coated/Fe0 has great potential for the practical applications of anaerobic digestion.The main Achievements have been published in Renewable and Sustainable Energy Reviews with an impact factor of 16.799 under the title A novel method to improve methane generation from waste sludge using iron nanoparticles coated with magnesium hydroxide. Currently the second paper currently in progress.