Enhanced biogas production from anaerobic codigestion of solid waste by sonolysis

This paper examines the effectiveness of sonolysis in improving the anaerobic biodegradability of the organic fraction of municipal solid waste coming from mechanical selection, thus enhancing biogas production and energy recovery as well.Methane yield of solid organic material anaerobic digestion is significantly affected by substrate availability that was evaluated, in this investigation, through organic matter solubilisation tests carried out at different conditions of ultrasound treatment. Results show that sonolysis can significantly improve the solubilisation of organic solid waste, thus allowing higher biogas production from anaerobic treatment of sonicated substrates. After 45 days, the biogas produced during anaerobic codigestion tests for the sonicated mixture was 24% higher than untreated one.Therefore, these results can lay the basis for the development of technologies useful to produce high biogas quantities, in order to improve clean energy generation from biowaste.

► Sonolysis as organic solid waste anaerobic codigestion pretreatment. ► Organic matter solubilisation and anaerobic codigestion tests were performed. ► Low-frequency ultrasound treatment improves organic matter solubilisation. ► Sonolysis increases biogas production from sonicated substrates anaerobic digestion.