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Food industry generates high amounts of waste that can be valorized to produce energy by fermentation and conversion in biogas. This paper aimed to study the effects of biomass type (vegetal, animal and mix) and fermentation temperature (35, 40, 45 degrees Celsius) on methane concentration and energy production in a biogas plant in Suceava, Romania. An I-optimal mixture-process design was used for mathematical modelling of the data. The optimization of factors was performed by using desirability function and setti...