Thermodynamic Equilibrium Study of Anaerobic Digestion through Helmholtz Equation of State

The growing attention regarding a more sustainable future, and thus into energy recovery waste reduction technologies, has intensified the interest towards processes which allow to exploit biomasses generate energy, such as anaerobic digestion. Improving efficiency of this industrial application is crucial increase methane production, essential from economic, environmental safety point view. This study focuses on thermodynamic modelling steady-state reactor flash unit, in order determine best operating conditions produce maximum amount pure bio-methane. To purpose, new hybrid approach based Peng–Robinson cubic equation state Multi-Parameter Helmholtz-Energy EoS been proposed. simulations, performed using developed algorithm at temperatures between 20 55 °C pressure values 0.3 atm 1.5 atm, out that fugacity mixture evaluated with proposed technique much accurate reliable than one calculated PR EoS. In addition, research shown not only purity production biogas can be optimised by working mesophilic 1 but also it convenient operate temperature range 42 °C–45 °C, since about % H2S goes exiting biogas, reducing CH4 raising post-treatment costs. Lastly, seen there significant water content vapour phase (∼5 %wt.), factor taken account improve process.