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The aim of the present study was to evaluate the life cycle energy balance of the integrated bio-combustion process. The life cycle analysis tool was applied to assess the environmental performance of the system. The experiments were performed in a bubble column photobioreactor with a volume of 2L, photon flux density of 150 μmol/m2/s, continuous aeration of 1VVM, and injection air-enriched with 15% of CO2. The photobioreactor exhaust gases were integrated into the bio-combustion furnace, which was designed on a lab-scale. The operational conditions were: initial coke mass of 1g, total combustion reaction time of 20 min, and airflow rate of 1 L/min. The energy balance was determined by equating of the energy produced by the required energy, followed by the net energy ratio. The results obtained showed a net energy ratio for the integrated process of 0.69, indicating an energy efficiency improvement close to 70%. Thus, the system has the potential to boost the sustainability of industrial facilities.

Environmental assessment of the integrated bio-combustion process: A life cycle energy balance