Abstract:

In this study, a practical session for material and energy valorization of biowastes was designed. The session focused on the experimental determination of the biogas generation and the modelling of the anaerobic digestion process. The main aim was to introduce fundamental concepts of bio-energetic valorization through the anaerobic digestion process.

For the practical design, manometric sensors were used to determine the biogas generation. These devices were chosen because of their versatility, which facilitated the generation of easily accessible experimental data using user-friendly interfaces. Throughout the laboratory session, students conducted experiments for varying values of input variables, engaging in discussions that evaluated system performance, particularly in terms of bio-gas flow rates (CO2 and CH4) and the time required to reach steady state, among other parameters.

Once obtained and analysed the experimental results, a set of equations was used to model the behaviour of the system by using excel (Ms Office). The model was based on a two-step anaerobic digestion model (acidogenesis-methanization). From the modelling works, the students were able to determine the value of the main model parameters.

The outcome of the practice was a dual-fold. Firstly, the development of experiments aimed to assist students in understanding the influence of input variables on the anaerobic digestion process. Secondly, a mathematical model was used to describe the experimental performance of the laboratory practice, enabling students to analyse results and obtain conclusions within a single session.

Keywords:

Practical activity, anaerobic digestion, renewable energy master.